HEI Ignitions

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HEI Ignitions--A primerGM has offered High Energy Ignition (HEI) systems on vehicles starting with selected '74 models. HEI was standardon '75 and newer vehicles. There is now tremendous aftermarket support for HEI, both for individual components andcomplete ready-to-run distributors. This guide is intended to help you understand the different kinds of HEI, as well asto help you sort out valid engineering from the silly claims primarily coming from keyword-spamming marketers ofjunky imported components. If you plan to use an HEI in a GM engine family, please check out my guides toGMSmall-Blocks , GM Big-Block engines , and Chevrolet Big-Block engines .

Kinds of HEIFirst, all HEI systems are a kind of electronic ignition, but not all electronic ignitions are HEI. Electronic "conversionkits" to eliminate distributor contact points or complete distributors which don't use GM HEI-style parts inside are NOTHEI systems. "HEI" is a GM/Delco trade name for their particular kind of electronic ignition, keeping in mind that theGM design evolved over the years. More broadly, it is used to describe aftermarket "copies" of the GM design, someof which are designed to be used in engine families that did not have GM/Delco-produced HEIs. For example, thereare aftermarket copies of the HEI which have distributor housings designed to fit Ford engines.

GM introduced HEI using a novel, "all-in-one" approach for it's V-8 and V-6 engines. This was an improvement of theearlier "Unit Ignition System" used on a very few Pontiacs starting around '72. (The older Unit ignition has thedisadvantage that the spark plug wires are also unitized and not replaceable except as a complete set of eightbecause they are "tied together" at the distributor cap mount.) The Unit Ignition System uses a smaller-diameter capand housing than the later HEI. The pre-HEI "Unit" ignition system is fairly rare.

Please forgive the tiny photos, I have NO CONTROL over picture size allowed in eBay Guides.

Delco "Unit Ignition System" to fit a Pontiac engine. Photo courtesy of chellosnos, used with permission.

The HEI ignition components (Distributor housing including the centrifugal and vacuum advance units, magnetic pick-up and it's "trigger" the reluctor, the electronic module or amplifier, and the ignition coil) were placed in a singleassembly. A single battery-voltage power wire supplied all that was needed to run the system. It is incorrect to call thepower wire a "12-volt" supply, because when the starter motor is cranking the engine, the voltage may go as low as 9volts, and as the alternator charges the battery, voltage may be as high as 15.5 volts. The HEI is designed to surviveup to about 17 volts. A trigger wire connection was provided so that the HEI could drive an electrically-operated tach.These "all-in-one" units are called the "coil-in-cap" HEIs. The distributor caps (and the aluminum housing theyattached to) were made considerably larger than what was traditional, engineers believed that the high voltagepotential these ignitions were capable of mandated greater spacing between spark plug terminals to prevent cross-fire. In the early years, the inline engines--4 and 6 cylinder--generally did not use the "all-in-one" design, they hadremote-mounted ignition coils with a coil wire connecting the ignition coil to the distributor. The in-line engines did notuse a larger-diameter cap and housing. The electronic control module became more complex as emissions

requirements tightened over time, and a major revision to the HEI was done in '87 for Chevrolet trucks using ThrottleBody Injection (TBI) so the Chevy TBI V-8 and V-6 engines no longer had the ignition coils in the distributor caps, andthe caps were no longer of the larger diameter.

The module is the heart of the HEI system, early modules had four electrical terminals: two large ones, for batteryvoltage input, (labeled "B") and the ignition coil grounding terminal (labeled "C"). There were two smaller terminals forthe pickup coil leads to attach to (labeled "W" for white and "G" for green--the colors of the pickup coil lead wires.More on this later. These four-terminal modules are the most common ones, favored for typical "hot-rod"purposes on non-computer-controlled vehicles.

I have seen photos of a three-terminal HEI module, they're listed as NAPA number TP46. I've never held one in myhand. They're VERY rare-but that doesn't mean they're valuable.

There were three different versions of a five-terminal module, and they aren't interchangeable with one another. Ineach case, the fifth terminal was used to accept a signal that the module processed in order to retard the timing. Allthe "5-terminal" modules are used with distributors having conventional centrifugal and vacuum advancemechanisms.

1. HEI/EMRElectonic Module Retard uses a wire connected to a switch or to an electronic control package. Undercertain conditions, the switch or control package will ground the wire, which triggers the retard feature built into the
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distributor module.

2. HEI/ESCElectronic Spark Control uses a knock sensor and an electronic controller. The knock sensor sends avoltage signal to the controller, which sends a voltage signal to the distributor module, activating the retard featurewithin the module.

3. HEI/ESS Electronic Spark Selection uses an outboard electronic decoder which receives voltage signals fromthree sources: a manifold pressure switch, the distributor pickup coil, and an engine temperature switch. The decoderprocesses the information and provides a voltage signal to the distributor module to adjust the amount ofadvance/retard.

When vehicles went to full computer control of ignition timing and fuel mixture beginning in '80 or '81, a seven-terminal module was used. This is termed HEI/EST (Electronic Spark Timing) These distributors did NOT havecentrifugal and vacuum advance mechanisms, all timing advance was pre-programmed into the computer, usinginformation from the entire array of engine sensors. Base timing could be adjusted, however. A not-common variantof HEI/EST used an additional in-distributor component called a Hall Effect Switch, providing a better signal to thecomputer at cranking speed than the ordinary pickup coil and reluctor.

The later Chevrolet TBI separate-coil distributor, along with distributors for some other engines, use an 8-terminalmodule. Delco sold a marine distributor kit to upgrade older boat engines to electronic ignition, it was called the DelcoVoyager Marine Distributor Ignition System. Kits were available for 2.5 and 3.0 liter 4-poppers (P/N 10457090), 4.3liter V-6 (10457091), Small block Chevy (10457092) and Big Block Chevy engines (10457093). (the only differencebetween the small block and big block kits is the ignition coil--because of a different mounting bracket) These marine

ignition kits relied on the timing curve built into the module for all spark advance. Sadly, these kits have beendiscontinued. It would be possible, therefore, to run a race-only engine using the marine 8-pin module and nocomputer, using the timing curve built into the marine module. Because there is no counterpart to vacuum advance,this would be a very poor choice for a street-driven car or truck.

Coil-in-capAlthough all early HEI distributors seem to look alike--aside from the housing changes needed to fit different enginefamilies--there is a tendency for people to think that all the parts inside are the same, too. This is not the caseespecially in terms of the ignition coils and the pickup coils. Ignition coils and pickup coils should be considered a"matched set", that is, you need to look at the color codes on each part and match the codes to each other, and to thevehicle/engine family the distributor will be used in. Failure to use the appropriate color codes may result in poorstarting and misfiring at low speed. The brand names listed are for the ENGINES, not the CARS--a Chevy-designed

engine in a Buick car uses the Chevrolet color codes, not the Buick color codes.

For V-8 engines, there are three color codes for the pickup coils:Yellow tyrap (early) or Yellow plastic connector (later) on the wires. Used on Chevrolet; Cadillac; and Olds engines inToronadoBlue tyrap (early) or Black plastic connector (later) on the wires. Used on Buick; and all Olds engines except those inToronados. The lead wires are slightly longer than those used on the "yellow" pickup coil.Clear or NO tyrap (early), Clear or NO plastic connector (later) on the wires This is identical to the Blue/Black colorcode, except the wires are even longer to fit a Pontiac distributor.

Sorry, I have NO CONTROL over the size of the photo.

Note the first two coils have green/white wires, the third has white/green wires. Wire lengths are from longest toshortest.The connectors are, in order, Clear (Pontiac), Black (Buick/Olds), Yellow (Chevy/Cadillac)The yellow connector is right-side-up, both the other two must be flipped over (wires crossed) to connect to themodule. Crossing the wires preserves the electrical polarity while allowing reversed magnetic polarity.

There are two color codes for the in-cap ignition coils:Red and Yellow wires Used on vehicles that use the Yellow coded pickup coil.Red and White wires Used on vehicles that use the Blue/Black, or Clear pickup coils

As a rule of thumb: If the engine has the starter motor on the right (passenger's side), it uses the yellow code parts. Ifit has the starter motor on the left, it uses the other set. Since Olds Toronados are the only Olds engines with thestarter on the right, they use different coils from the other Olds engines. BUICK IS AN EXCEPTION, for reasons Ido not know. I have confirm ed the color co des and their appl icat ions for V-8 engines l isted above in DelcoService Bulletin 1.2D-27 dated 12-1-75.


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It has been claimed by others that the difference in the coils has to do with the direction of distributor rotation--that isNOT correct.

NOTE #1These coils may have different color codes, but NONE OF THEM is a HIGHPERFORMANCE/BETTER/FASTER/MORE POWERFUL version of another. You don't get stronger sparks with ayellow-coded set than the others. The ONLY difference is that when you pass an electric current through them, theyproduce a magnetic field in opposite directions. Note that for the Blue/Black and the Clear color coded pickup coils,the lead wires and the plastic connector (if used) are arranged in such a way that the wires must be crossed in orderto connect them to the module. The Yellow-coded pickup coil wires plug in without crossing. This maintains properELECTRICAL polarity, while allowing reversed MAGNETIC polarity. And magnetic polarity is only important at lowengine speeds, (especially cranking) because of electrical interference from the starter or perhaps the alternator--Ifthe interference is "just right", the module gets a false trigger signal. Using the correct magnetic polarity pickup coilcan eliminate the interference, and the correct magnetic polarity ignition coil is needed to match the pickup coil. You"can" mis-match the parts, but don't complain if the engine takes longer to crank or misfires during cranking.

NOTE #2Most parts books list the wrong coils for Olds engines installed in Toronados. Same for people selling "complete"Olds distributors--they don't specify which coils are used; and therefore they're going to be wrong for eitherToronados--or--all other Olds applications. MSD, a respected brand, does not sell a red/white HEI in-cap coil as of 30November '11, only the red/yellow versions. For engine families that do not have genuine Delco HEI parts support, Isuppose the best you can do is to assure the pickup coil matches the ignition coil--either both coils should be "yellow"codes, or both should NOT be yellow codes, either way. (and perhaps select parts based on which side of the engine

the starter is mounted on.)

Separate coilWith the ignition coil out of the immediate neighborhood of the pickup coil, there is no need to match magneticpolarity. Separate coils are not color-coded. Pickup coils are still matched to the engine family as long as that enginefamily had a genuine Delco HEI during it's production life.

Best "hot rodding" tricks1. Replace the high-resistance carbon button under the in-cap coil with a low resistance button from MSD, Crane,Accel, or other sources. (I generally use the Crane button, based only on price.) The stock high-resistance buttonscan get so hot that they melt the distributor cap.

2. If you don't want to deal with color coded ignition coils, an "in-cap" ignition coil can be easily replaced with anexternal ignition coil of your choice, a coil wire to suit, and a readily-available external-coil kit sold by MSD and others.

3. Adjust the centrifugal and vacuum advance curves to best suit your engine. There are adjustable vacuum advanceunits sold by Crane and others, or just buy a non-adjustable GM or aftermarket vacuum advance that is a good matchfor your application. Advance cans are sold with a multitude of different part numbers, relating to total advance andthe stiffness of the internal spring that determines how fast the vacuum advance operates. It is possible to modify anOEM advance canister to limit the amount of advance it provides; a canister that provides 25 degrees of advance canhave a sheetmetal tab welded/brazed/riveted into place to limit the advance to 12 degrees as shown in this photo:

Centrifugal advance kits are sold having springs, weights, and a center plate to adjust the centrifugal advance. Ingeneral, the weights in these kits are too light, and should be immediately thrown into the nearest recycle bin. Thesprings, and "perhaps" the center plate can be used to good effect. Keep in mind that GM supplied weights ofdifferent shapes and sizes, and that the center plate has as much effect as the weights and springs indetermining the advance curve--but I do not know of any source still selling an assortment of center plates. Grab'em from the salvage yard, or fabricate them yourself. (good luck!)

I have seen excessive "hidden" centrifugal advance. That is, you may think you have a normal, proper centrifugaladvance, and that it stops advancing at or around 2500--3000 rpm. But if you rev higher, it will begin advancingagain at 4000-4500 rpm. That "hidden" advance--perhaps an additional 5--10 degrees--at best will reduceperformance and perhaps cause ping--at worst it will destroy your engine. I have seen this on EVERY GM centerplate I've checked when the weights are acting on the gently rounded part of the center plate. If you flip the centerplate upside down, so the weights act on the dogleg curve part, the advance will positively stop at a given RPM


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dependant on the weights and the shape of the center plate. The numbers stamped into the center plate may face upor face down. Either way "can" be correct, depending on the direction of rotation of the distributor.

4. Assure that the module you are using is at least as good as the stock GM/Delco units supplied since the later '70's.Very early GM modules had problems, but since they're about thirty years old now, there probably aren't too manysurvivors. GM soon updated the module and it is now quite reliable for performance use. Many aftermarket modules--especially the ones sold based on low price--are inferior. I'd be suspicious of any module that didn't have a well-respected brand name. Delco; Echlin's quality line; and Standard/Blue Streak should all be just fine. There is an"urban legend" about how the HEI doesn't function properly after 4,000 or 4,500 RPM. Not true, provided you have aDelco or better module.

5. HEI distributors are not that tough to rebuild. The worst part would be installing new bushings, if they were needed.

I would rather have a rebuilt (or even a "good used") DELCOHEI than a brand-new Communist-China derived knockoffcopy,provided that Delco made a housing to fit the intendedengine.

6. GM considered the original '74--'75 HEI to be a "50,000 volt" device. The higher power that the HEI is capable ofwas the reason for the wider spacing of the spark plug terminals on the cap. So if the aftermarket discount hot-rod

parts seller is telling you how great his "50,000 volt coil" is, you can be pretty much assured that it's not one bit betterthan what GM installed as standard equipment on eleventy-billion cars and trucks over the years. FACT: You willNOT get any more voltage than what it takes to fire the plug. If the plug fires at 8,000 volts, that is all the coil willproduce--even if it's sold as a super-gee-whiz performance-car coil.

7. The thin pickup coil lead wires have had a history of failure due to the motion of the vacuum advance. The problemoften starts showing itself as the engine dying, then running, then dying, then running, etc. When the vacuumadvance moves the pickup coil to a certain position, the broken conductor inside the insulation of the wiredisconnects, and the engine dies. When the engine dies, vacuum is reduced, the vacuum advance relaxes--and thebroken wire re-connects and the engine runs again.

V2.2 PCB:

Topside view of V2.2 pcb (these are green pcb's)


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The V2.2 PCB has 4 spare connectors (X11 to X14) these can be used for various inputs and outputs for

the following circuits as they are conveniently available on the 37pin DB connector:

X11 = pin 25 of 37pin db




V3.0 PCB:


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The V3.0 PCB has 4 spare connectors (SPR1 to 4) these can be used for various inputs and outputs for the

following circuits as they are conveniently available on the 37pin DB connector:

SPR1 = Pin3 of 37pin db




V3.57 PCB

As can be seen, theres no proto area on the V3.57 and the components are very small. So soldering wires onto the

board for spark outputs, hardware options, etc, is going to need a great deal of care. You may even have toremove some parts, which is not easily done to surface mount components, so I don't feel these manuals shouldcover doing this, as damage is very easy to do. Also a daughter board will need to be built if you want some ofthe hardware options as theres no proto area to build on. I have therefore assumed if you bought a V3.57 that youwill not be modifying it to use the hardware functions such as Tacho out, PWM Idle valves, Boost control,Launch input, etc, etc. If you do wish to use these then you will have to build a daughter board of some form to


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mount the components on. If you use more than 2 spark outputs youll need to use the db15 connector, but ensureyou strengthen the traces on the board with copper wire or solder to the pin directly, also connect the outputs in

pairs of pins, as per the instructionsHERE.

Note that the JS0 - JS11 pads are all electr ically the same as the V3.0 PCB as are the SPR1 - 4 pads, so they

can be used in the same way as the V3.0 PCB. The addit ion is JS12 which is the same as the bottom of R1 on

the V3.0 pcb, but R1 will sti l l need to be removed to use it on the V3.57, so be very very careful l ! ! !

Suggested points for Supplies inside the V3.0 ECU
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#mulitcoilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#mulitcoilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#mulitcoilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#mulitcoil


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Component Pinouts


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Pull up circuit diagram

List of component part numbers used in the ignition section:

DigiKeypart numbers: Farnellpart numbers
http://www.digikey.com/http://www.digikey.com/http://www.farnellinone.co.uk/http://www.farnellinone.co.uk/http://www.farnellinone.co.uk/http://www.digikey.com/


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2N2222A = 497-2598-5-ND1N4001 = 1N4001/4GICT-

ND1K resistor = 1.0KQBK-ND470R resistor = 470QBK-

ND2K resistor = 2.0KQBK-NB330R resistor = 330QBK-

ND

680R resistor = 680QBK-ND



1K5 resistor = 1.5KQBK-ND


0.01uF Cap = P3103-ND

4N25 (opto) =4N25ASHORT-ND

2N2222A = 920-71201N4001 = 352-5326

1K resistor = 509-164470R resistor = 543-3052K resistor = 543-457

330R resistor = 543-263680R resistor = 543-342200R resistor = 543-214270R resistor = 543-2401K5 resistor = 543-4214K7 resistor = 543-5480.01uF Cap = 389-09954N25 (opto) = 102-1090

Please note: Above part numbers will need checking, some components will come with a minimum order in multiples of 5 and

10.

Megasquirt and Spark (MSnS)

More specific details on MSnS setups (Distributor based)
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#msns_morehttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#msns_morehttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#msns_more


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Ensure only LED17 (D14) is set as a spark output (Spark OutputA) there must be NO other Spark Outputs

selected!! !

This mode is for use with a single coil distributor allowing you to control your timing if you have a single coilfiring through a distributor, an MSD 6A amplifier, etc.Your tach signal into the Megasquirt can come from a crank trigger or from a "locked" distributor (dizzy) usinghall, points, inductive VR or opto sensors.This mode requires ONE Trigger per Spark Event, e.g. 2 pulses from a crank on a 4cy or 4 pulsesfrom the disrtibutor on a 4cy (distributor runs at half the speed of the crank) , 4 pulses from the crank on aV8 or 8 from the distributor on a V8, etc.If your engine has a toothed wheel (e.g. a 60-2, 24/2, 36-1, etc) then you must NOTuse MSnSmode, setup theWHEEL DECODER MODEinstead, and select SparkA as the only spark output whilst using the distributor.A locked distributor is one that has mechanical and vacuum advance either removed or "locked" out so that thetrigger signal occurs at the same crankshaft angle at all rpms. Many distributor cars with EFI already have alocked distributor.Crank triggering provides a more stable advance as there is no timing chain or belt and distributor gear jitter. Fora four cylinder engine you would require two pips/lobes or bolt heads (giving 2 signal pulses) at 180 degrees toeach other and a VR / hall sensor, for a 6cy you will need 3 pulses per crank revolution at 120deg intervals and 4for a V8 at 90deg intervals. (note that a crank rotates at half the speed of the cam drive). The V3 circuit board candirectly read from a VR sensor. The V3 board also provides a VB921 high current driver that will drive yoursingle coil directly, this means you dont need an amplifier/dwell controller. If you use a crank trigger you do notneed to modify your distributor. Just make sure that the internal rotor points towards one of the towers when theengine is roughly in the firing angle - if it is halfway you can easily get cross-firing between cylinders.

Below is a general layout drawing of the V3.0 MS ECU and trigger sensor with the coil.

IMPORTANT - do NOT set your total Trigger Angle (i.e. Trigger Angle plus additions) inbetween the

range 20 to 50 degrees as you will encounter problems and be unable to get your desired advance. If this is

the Trigger Angle you calculate then you either need to move your crank sensor/wheel or modify your

distributor to obtain a compatible trigger angle. This is due to the way the ECU calculates the spark

timing, the calculations need around a 5deg band from the Trigger Angle.

e.g. If you set a Trigger Angle of 23 degrees (no additions) then your maximum advance would be about

18degrees which will almost certainly give you a very lame engine down on power.If the Trigger Angle setting is less than 15 deg the code will use "Next Cylinder" sparking, which means it

will work out the timing for the next spark rather than the current spark, this is perfectly acceptable.

Please note: VR sensor users must use "Time Based cranking" when in MSnS mode, this is in the Spark

Settings page.
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A distr ibutor is needed with the MSnS mode to distri bute the spark the correct cyl inder, since it only has one

ignit ion output. I f the distr ibutor i s used to tr igger the igni tion all advance mechanisms have to be locked.

The distributor may have to be modified to ensure that the spark is delivered to the correct cylinder. The onlyimportant thing is that the rotor arm points to the correct contact in the distributor cap.The best bet is to get the rotor arm line up to a contact at about 25 degrees before TDC. It is not important to getexactly this angle, some 10 degrees before or after will be probably be OK, as long there is no risk for cross fire(spark on wrong cylinder)

Setup - Hall sensorFirst, in Megatune in the Codebase and outputs function, set LED18 to "irq trigger" and send to ECU.1) Set the crank at TDC2) Rotate the distributor (opposite direction) just until middle LED turns OFF (sets the crank angle)3) Make sure the rotor arm points towards the correct contact in the distributor cap4) Fix the distributor5) Turn engine backwards until middle LED turns ON (should be almost immediately) and continue turning untilit turns OFF again6) Measure angle BTDC (+/- 10 degrees is good enough) at the crank7) Enter measured angle in "Trigger angle"8) Enter "Fixed angle" to 10 degrees

9) Start the engine10) Adjust "Trigger angle" until the timing light is at 10 degrees11) Set "Fixed angle" to -1012) Start tuning

Setup - VR sensor1) Set the crank at 20BTDC3) Make sure the rotor arm points towards the correct contact in the distributor cap4) Bolt down the distributor5) Turn engine backwards until the pip lines up with the VR sensor6) Measure angle BTDC (+/- 10 degrees is good enough) at the crank

7) Enter measured angle in "Trigger angle" ofSpark Settings8) Enter"Fixed angle" to 10 degrees this tells the ECU to ignore the spark map and hold it to the Fixed Angle.9) Start the engine10) Adjust "Trigger angle" until the timing light is at 10 degrees11) Set "Fixed angle" to -10 , this tells the ECU to run from the spark map again.12) Start tuning

Here is a list of links to a superb section on Distributor based setups, showing more detail that the above.

MS ConnectionsMegaTune

Settings*

Distributor Points, Fuel only MS v2.2MS v3.0MS v2.2, MS v3.0

Distributor Points with sparkMS v2.2MS v3.0 MS v2.2, MS v3.0

After Market Electronic Ignition MS v2.2MS v3.0MS v2.2, MS v3.0

Crane XR700 (Optical Trigger)

MS v2.2 LED17 spark

MS v2.2 FIdle spark

MS v3.0

MS v2.2 LED17 spark

MS v2.2 FIdle spark

MS v3.0

Malory Unilite (optical trigger) MS v2.2MS v3.0 MS v2.2, MS v3.0
http://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPoints_v22.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPoints_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPoints_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPoints_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_fuel_Only.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPointsSparkInput_v22.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPointsSparkInput_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPointsSparkInput_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPointsSparkInput_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_LED17VB921_spark.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Elect_Gen_Distr.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Elect_Gen_Distr.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Elect_Gen_Distr.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Elect_Gen_Distr.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_LED17VB921_spark.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrCrane_d17_v2.2.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrCrane_d17_v2.2.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrCrane_FIdlev2.2.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrCrane_FIdlev2.2.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrCrane_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrCrane_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_spark_inverted_no.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_spark_inverted_no.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_spark_inverted_no_FIDL.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_spark_inverted_no_FIDL.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_LED17VB921_spark.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_LED17VB921_spark.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrUnilite_v22.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrUnilite_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrUnilite_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrUnilite_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_LED17VB921_spark.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_LED17VB921_spark.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrUnilite_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrUnilite_v22.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_LED17VB921_spark.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_spark_inverted_no_FIDL.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_spark_inverted_no.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrCrane_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrCrane_FIdlev2.2.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrCrane_d17_v2.2.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_LED17VB921_spark.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Elect_Gen_Distr.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Elect_Gen_Distr.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_LED17VB921_spark.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPointsSparkInput_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPointsSparkInput_v22.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/Settings_fuel_Only.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPoints_v3.htmhttp://www.msextra.com/doc/ms1extra/Dizzy_Ignition/DistrPoints_v22.htm


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Wire the Output Section like this:

Remove, if fitted, link between IGN and IGBTOUT


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Diagram for V2.2 and V3.0 wiring:

Next wire 2 x HEI 4 Pin Modules like this:


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Setting the Software for Neon/420A

In Codebase and Output functions ensire that NEON/420A is the only ignition option selected and that LED17and LED19 are the ONLY 2 Spark outputs!!


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Wheel Decoder System

Coil On Plug (COP)--Where to mount the sensor and wheel--Megasquirt hardware mods for 2 rotor with theNipponDenso--Software Settings

Second Trigger Sensor Input
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#cophttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#cophttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#mountvrhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#mountvrhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#mountvrhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#rotarywheelhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#rotarywheelhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#rotarywheelhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#rotarywheelhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#wheelsofthttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#wheelsofthttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#secondtrighttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#secondtrighttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#secondtrighttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#wheelsofthttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#rotarywheelhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#rotarywheelhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#rotarywheelhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#mountvrhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#cop


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The wheel decoder allows the use of a multi-toothed trigger wheel such as 36-1 (commonly fitted to Fords), 60-2(used mainly by Bosch and therefore very widespread in Europe.) Seewww.trigger-wheels.comfor a supplier ofcustom made wheels. Other custom wheels such as 6-1 or 4-1 also work. Also supported are dual wheels such asthe 24/2 wheels seen on Mazdas and Toyotas. These have two wheels, one with 24 evenly spaced teeth and asecond pair of teeth with a second sensor. (See the Second Sensor Input SectionHERE)The code suppor ts:

Fuel only

Single coil (distr ibutor based setup)

Wasted sparkwith mul tiple coil s

I t can also support coil per plug in some install s.

Forwastedspark you require a minimum of single "missing tooth" crank wheel, only engines with an evennumber of cylinders being supported. You need at least 4-1 for 4cyl, 6-1 for 6cyl or 8-1 for 8cyl. However, the36-1 wheel is probably the easiest to obtain. The MS ECU can drive up to 6 seperate spark outputs, meaning itcan run up to a 12 cylinder in wasted spark mode. (4cy, 6cy, 8cy 10cy and a 12cy)Coil per plug can be achieved with a crank wheel and single-tooth cam wheel OR a dual wheel cam setup OR a

missing-tooth cam-wheel alone.

For a distributor based setup with a trigger wheel, simply follow all of the wheel decoder instructions but ratherthan setting SparkB, C, etc as outputs (as in awastedspark setup) only set LED17 as SparkA output and ensureall other spark outs are NOT set:

LED17 (D14) = SparkA

LED18, LED19, Output3/SparkD, pin10 shift and knockin must NOT be a Spark output

The easiest install will bewastedspark using VB921 FET's to drive the spark coil(s) directly from a V3.0 PCB.(See the Spark Output selections available HERE) In this way it can be used like EDIS but without the need foran EDIS module, it has the advantage of allowing spark cut rev limiting. The downside is that it is more difficultthan EDIS and requires extra software settings. If you are buying a pre-assembled Megasquirt (e.g.www.ExtraEFI.co.uk) your vendor will be able to do this for you.

The wheel decoder is a very powerful front end on top of the MSnS spark code that allows generic crank/camangle wheels and vr sensors to be used with the Megasquirt for tach triggering, and ignition. Before setting up thewheel decoder, several questions should be asked:

1) How many cylinders (or rotors?) this will tell you how often you get a firing event, and help with setup later.

8 cyl: 90 deg between firing6 cyl/3 rotor: 120 deg between firing4 cyl/2 rotor: 180 deg between firing

2) Where is your wheel going to be mounted, camshaft or crankshaft? This matters because the camshaft turnshalf a revolution for every crank revolution. This will also help determine how to set things up later.

3) Are you going to use a wheel with a missing tooth or a Cam Angle Sensor which actually has 2 wheels and 2VR sensors.

4) Finally, how many teeth does your wheel(s) have?

5) When does the missing tooth (teeth) pass the sensor with respects to TDC or what tooth does the sensor seewhen the engine is at TDC?

When you have all this information, you're at least ready to start.
http://www.trigger-wheels.com/http://www.trigger-wheels.com/http://www.trigger-wheels.com/http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#secondtrighttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#secondtrighttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#secondtrighttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.extraefi.co.uk/http://www.extraefi.co.uk/http://www.extraefi.co.uk/http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#secondtrighttp://www.trigger-wheels.com/


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Where to mount the sensor and wheel

Lets asume your going to change a distributor based setup over to awastedspark coil pack setup. The changesneeded will be different for each engine but the basics should be the same: A wheel will need to be fitted on thecrank pulley, a VR sensor will need to be mounted to detect the wheel and a set of coil packs will need to bemounted onto the car.

Typical trigger discs (36-1) from a Ford VR

Sensor

Mounting the wheel is quite critical in that it MUST be mounted so it rotates without moving up, down, left orright as the sensor needs to see all of the teeth with a gap of 0.75 - 1.0mm. The VR sensor can be found on

vertually all Fords that have a coil pack under the bonnet, you'll need the coil pack too, so get them both at thesame time, also keep the HT leads as the connectors will be needed. The VR sensor is usually mounted on the

bell housing somewhere, depending on the engine.

When fitting the wheel set the engine to Top Dead Centre (TDC) if you fit the sensor so it aligns with tooth 9, asthe following diagram, then you can use the Trigger Wheel settings in the diagram, this is recommended for easeof setting up.

Set the Trigger Return Value to 60deg and Spark Inverted Output =YES in the Spark Settings Menu.
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswasted


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trigger angle=60Timebased cranking and 10deg cranking angle.trig A=3trig B=21Use two VB921 to drive the coils and set LED17,LED19 as spark outputs.Spark output "inverted"Dwell control with 5ms cranking, 4ms running and a 0.1ms min discharge.

Untested example

Euro Ford Granada/Sierra DOHC. Internal 36-1 wheel and single coil / distributorThis assumes the 36-1 wheel aligned the same as EDIS4 (see EDIS pages)trigger angle=60Timebased cranking and 10deg cranking angle.trig A=3trig B=21Use one VB921 to drive the coil and set LED17 as spark output (only 1 spark out as only one coil).Spark output "inverted"Dwell control with 5ms cranking, 4ms running and a 0.1ms min discharge.

The MS ECU can NOT tr igger on a missing tooth, so you must ensure that all of theused Trigger PositionTeeth as set in "Wheel Decoder Settings" are NOT set to ZERO, if they are then you may have to alter the

Trigger Angle a li ttle to select another tooth. However all of theUNUSED Trigger Position TeethMUST be set to ZERO!

The code acts as a front end ahead of the normal MegasquirtnSpark system.The first step the code takes is to find the missing tooth/teeth by comparing the time between IRQ (InteruptRequest) pulses (trigger inputs). The missing tooth (-1 tooth) is found if the period is > 1.5* the previous, a -2 isfound if the period is > 2.5* the previous.Once the code has syncronised to the missing tooth/teeth it then counts the other teeth. When the tooth number

matches a predefined trigger position it executes the rest of the code. The first tooth or the second missing toothdetected after the first missing tooth is Tooth 1. The first missing tooth is tooth Zero. A second set of triggervalues can be used to define "Trigger Return" positions that set the cranking timing.

The Trigger Return positions and the Cranking Angle work together and it is VERY importantto understand how this works. It is usually set up for the cranking angle when there are enough teeth.So if you have a 36-1 or 60-2, etc, set the Trig Return tooth thats at 10deg BTDC, this is usuallythe firing angle at cranking. So in the example below tooth 18 and 48 would be aligned with thesensor at 12deg BTDC (this is as close as you can get to 10 on a 60-2). Next enter 12deg into theCranking Angle, this is VERY important as it is used to work out the Dwell! If your fitted thewheel your self then ensure this angle is correct, if not alter it so it is, it may be 2-5deg out if youfitted the wheel, so alter the value. This should be easy enough to see or to work out using a timinglight and crank the engine, if its sparking at 8deg then enter 8, etc!If you decide to not use Trigger Return (Timing Based) then set ALL Trig Return pos to ZERO,equally if you dont have enough teeth to do this (e.g. 4-1, 12-1, etc) set ALL the Trig Return Pos toZERO and set Timing Based in Cranking Timing


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Another COP example, this time an autronic wheel retrofitted into a CAS (spins at cam speed). As this is a 4cylthere are four outer holes. The single hole is the 2nd trigger "reset" pulse.

Second VR Sensor Input for Wheel Decoder

2 Sensors on Crank or Cam Sensor (with 2 pulses per cam rev) example--2nd Sensor on Cam (with 1 pulse percam rev) example

The Second Input option is a variation of the multi-tooth or generic wheel for ignition timing input. Normally amulti-toothed wheel or generic has a missing or filled in tooth to provide a reference point. Where the timingwheel has all of its teeth, a second input every crankshaft revolution can provide the same timing capability as amissing or filled in tooth. The next tooth on the main toothed wheel after the second trigger is defined as tooth 1.All the other features and functions of the toothed wheel software is available, including wasted sparkfordistributor-less installations.

For some instances of Nippondenso electrical systems, (Mazda and Toyota) the second input allows the use ofthe OEM distributor, cam position sensors without having to mechanically modify anything. These distributorshave a 24 tooth wheel which rotates at half crankshaft speed. Either a single second pickup and wheel with 2teeth, or two pick-ups with a single tooth can be used as a second input into MSnS.

To use this feature you need to have an appropriate input signal conditioner for the main and second input, seethe Second VR Sensor Input sectionHERE

The main wheel connection is made the same way as you would for any other wheel or main tachometer input,see the VR Sensor Input SectionHERE

The second input is made with a duplicate conditioner and components to replicate the tachometer input but thisis connected directly to Pin 11 of U1. Note as this pin is also an output in some configurations, it is stronglyrecommended you include a 1k resistor in series with Pin 11. This will protect both U1 and the VR conditioner

from overloading each other if U1 Pin 11 is set as an output. A daughter-board will be required to mount thesecomponents with a flying wire soldered directly to Pin 11. (Underside of board)

Following Example is when the Second Sensor is on the CAM or Crank with 2 pulse per cam

revolution (180deg apart) or 1 pulse on the Crank per revolution(Primary sensor = Crank 60 teeth)
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2senscrankhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2senscrankhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2senscamhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2senscamhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2senscamhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2senscamhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#deswastedhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2senscamhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2senscamhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2senscrank


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Codebase and Output Functions - Ensure only the Wheel Decoder - Generic Wheel option is set. Thisexample is for a 4cy wasted spark so it has ONLY Spark A and Spark B set! Please see theBasic Config manualfor more.

If directly driving your coils from the MS ECU then set dwell as:

Please note that these will need to be tuned, see the Dwell section of this manual.

Following Example is when the Second Sensor is on the CAM with 1pulse per cam revolution:(Primary sensor = Crank 60 teeth)
http://www.msextra.com/doc/ms1extra/MS_Extra_Basic_Configuration_Manual.htmhttp://www.msextra.com/doc/ms1extra/MS_Extra_Basic_Configuration_Manual.htmhttp://www.msextra.com/doc/ms1extra/MS_Extra_Basic_Configuration_Manual.htmhttp://www.msextra.com/doc/ms1extra/MS_Extra_Basic_Configuration_Manual.htm


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Codebase and Output Functions - Ensure only the Wheel Decoder - Generic Wheel option is set. Thisexample has Spark A, Spark B, Spark C and Spark D set! It could run a COP setup (4 cy) or a wasted spark 4cy.Please see theBasic Config manualfor more.

Primary teeth =

60Primary teeth = 4
http://www.msextra.com/doc/ms1extra/MS_Extra_Basic_Configuration_Manual.htmhttp://www.msextra.com/doc/ms1extra/MS_Extra_Basic_Configuration_Manual.htmhttp://www.msextra.com/doc/ms1extra/MS_Extra_Basic_Configuration_Manual.htmhttp://www.msextra.com/doc/ms1extra/MS_Extra_Basic_Configuration_Manual.htm


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Fitting the VR Sensor and the 36-1 wheel

Ford's Electronic Distributorless Ignition System (EDIS) is an ignition system that does NOT require a camposition signal. It can function with just a variable reluctor crank position sensor (VR sensor) and a 36-1 toothwheel (36-1 means '36 teeth minus one', and refers to 36 evenly spaced teeth, one of which has been removed).

Because it doesn't need a camshaft position sensor, EDIS is a particularly easy way to replace distributorignitions when retrofitting older engines with a modern computer programmable ignition, but we nowrecommend directly driving the coil packs from the MS ECU using the VB921 FET's. This does away with the

EDIS module, so all thats needed is the 36-1 wheel, a VR sensor and the coil packs. Please see the VR inputSensor wiringand theDirect Coil Drive Wiringsection.

If you alread have an EDIS setup and want to use it then these are the mods for it:

The EDIS system is made up of:

EDIS module,crank wheel,crank variable reluctor sensor (VRS), andone or more coil pack(s).

Finding Edis 4 in North America:

Early to mid 1990s Ford Escort/ Mercury Tracer with base 1.9L SOHC engine were fitted with the EDIS4system. You can tell the engine because it has a tubular aluminium (NOT cast) inlet manifold.

The EDIS4 module is mounted just behind the fuse box on the drivers side of the engine bay, it has a label on theplug that says EDIS4. The bolts are 10mm AF. You are advised to remove the fuse box first for easier access.

Cut off as much as the harness as you can.

Looking toward the passenger side end of the engine, the VR sensor is above and to the left of the end of thecrankshaft. The easiest way to access the sensor is to remove the front wheel (if it's not already removed), lie onyour back, and reach up from the bottom to access the sensor mounting bolts. The bolts are either small metric orstar bit. Once it's off, the cable is most easily cut from the top.
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#ediswheelhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#ediswheelhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#ediswheel


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The crank pulley bolt is 19mm. You will need to stop engine from turning, various methods have been suggested.1) remove the head, put some rocks into the bore and refit the head. 2) remove a spark plug and put a long bardown the hole 3) remove a plug from cylinder with piston at BTDC and coil in some rope, remove rope whenfinished.

Click on images for a larger picture

Finding Edis in Europe:

1a) EDIS4 module1989-1993 Fiesta XR2i 1.61990-1992 Fiesta RS turbo1989-1994 Escort 1.6i1990-1994 Orion 1.6iModules are all in the engine bay and typically located in the middle of the bulkhead or the right hand side as

you face the car.Known part numbers are: 89FB-12K072-AC, 91AB-12K072-AA

Orion CVH MPI Fiesta / crossflow EscortMondeo with 1800/2000 engine.

Location of the VR sensor varies. On the small CVH engines it pokes through the rear flange of the enginetowards the flywheel. 1.8CVH Sierra has one on the front. 2.0DOHC Sierra/ Granada is in the block at the leftside way below the inlet manifold. Duratec V6 (Mondeo) is mounted near the front, it also has a cam sensor thatworks too.The mounting bolts are either small metric or star bit.

Escort / Fiesta location on engine flange above starter.

Do not confuse with the ESC II hybrid module which has a vacuum tube and comes on the carb model cars.There is also an aluminium one to avoid as well.

Click to enlarge picture of plastic hybrid module to avoid.

1b) EDIS6 moduleup to 1995ish Mondeo V6 automaticFord/Cosworth Granada Scorpio 24v V6Module located rear left of engine bay as you face the car.Known part numbers are: 90GB-12K072-AB
http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/esc2fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/escort-fiesta-vr-loc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/l-reg-mondeo-1800dohc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/m-reg-fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/h-reg-orion-cvh-mpi.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort2.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/esc2fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/escort-fiesta-vr-loc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/l-reg-mondeo-1800dohc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/m-reg-fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/h-reg-orion-cvh-mpi.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort2.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/esc2fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/escort-fiesta-vr-loc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/l-reg-mondeo-1800dohc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/m-reg-fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/h-reg-orion-cvh-mpi.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort2.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/esc2fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/escort-fiesta-vr-loc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/l-reg-mondeo-1800dohc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/m-reg-fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/h-reg-orion-cvh-mpi.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort2.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/esc2fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/escort-fiesta-vr-loc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/l-reg-mondeo-1800dohc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/m-reg-fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/h-reg-orion-cvh-mpi.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort2.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/esc2fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/escort-fiesta-vr-loc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/l-reg-mondeo-1800dohc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/m-reg-fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/h-reg-orion-cvh-mpi.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort2.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/esc2fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/escort-fiesta-vr-loc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/l-reg-mondeo-1800dohc.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/m-reg-fiesta.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/h-reg-orion-cvh-mpi.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort2.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/us-escort1.jpg


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1c) EDIS8 moduleChances of finding one of these in a scrapyard are very low! Not known to have been installed on any European

built vehicles. Your best bet is either to import a module from the USA or buy new. I would suggest buying theother bits locally.For connectors try one off another car if all the wires are in use or one off an ESC module. The number of wiresused in the connector varies so check they are all there!There is a possibility of using 2 EDIS4 modules to drive a V8. But now that the MS ECU can directly drive 4coils (V8 in wasted spark) this is no longer necassary.

2) 36-1 trigger discThe 1.8CVH Sierra has a useful disc pressed onto the back of the crank pulleyAll of the other CVH installs have the trigger teeth cut into the flywheel and so are useless.

For a scrap yard trigger disc, remove from 1.8CVH Sierra. You will need to stop engine from turning, variousmethods have been suggested.1) remove the head, put some old bolts or other junk into the bore and refit the head.2) remove a spark plug and put a long bar down the hole3) remove a plug from cylinder with piston at BTDC and coil in some rope, remove rope when finished4) Jam something into the flywheel teeth

Sierra pulley/trigger assy and VR sensor

If you are after a pressed steel disc, try part no. 1078767, about 12 from Ford, this came on the 16v DOHCGranada engines, alternatively wheels are available to order fromHERE

3) VR sensorUsually it is easiest to get from the same vehicle as the EDIS module so the loom wiring colours match.Or any vehicle with a trigger disc will yield one, so CVH Fiesta/Escort/Orion or Fiesta with Valentia (crossflow)engine with ESCII hybrid, DOHC Sierra/Granada, Mondeo. SeeHEREfor more on VR sensors.
http://www.trigger-wheels.com/http://www.trigger-wheels.com/http://www.trigger-wheels.com/http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#vrinhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#vrinhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#vrinhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#vrinhttp://www.trigger-wheels.com/


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Edis Wiring Diagram

Edis Wiring for a V3.0PCB:


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Ensure that the ONLY ignition option in Codebase and Output functions is EDIS and that LED17 is set asSparkA, NO other outputs must be set as a Spark Output.

Fitting the VR Sensor and the 36-1 wheel

Assuming you have obtained a suitable 36-1 wheel, you need to establish the correct relationship between theVR sensor and disc.There are two methods to visualise the relationship with the same outcome.SPECIFIC-ANGLE is defined as follows: EDIS4=90, EDIS6=60, EDIS8=50


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There should be 0.75 - 1.0mm gap between sensor and wheel.

To test this alignment it is best to run the EDIS in limp home mode. This can be achieved by disconnecting theSAW plug/socket or switching off/unplugging the ECU. Fit your strobe onto no.1 plug lead as normal (you mayneed to try the other tower of the pair). Ensure EDIS still has power and crank your engine, check that the timingis exactly 10deg. If not, adjust your sensor until it is. It is safe to idle the engine with the SAW lead disconnected,timing should be rock solid at 10BTDC. Don't forget to reconnect the plug when done!

Optional: multi-spark modeNOTE: Multi-spark is currently under test with MSnS-extra firmware.1) First get your engine running with multispark off, then:

2) Go to the Advanced >Advanced code options and set EDIS multispark on. Turn megasquirt off then on.2) Check your timing with a strobe at low rpm (less than 1100.)3) If the timing is locked to 10BTDC then the module is not compatible.4) If the timing varies as expected (you can use Fixed on Spark>Spark Settings to set e.g. 5 or 15) then it iscompatible.5) If in doubt leave it switched off.6) Advanced tester can experiment with the max rpm. The patent states 1100rpm.

Ford Thick Film Integrated IV Ignition Systems (TFI)

MS Input Wiring--MS Output Wiring--TFI Schematic--MegaTune Settings

The code is only designed for "push start" modules which are claimed to be grey in colour. Computer controlleddwell modules are black. Maybe this is USA only data because the Push Start module I used is mainly black. Ona push start the START wire will run to the ignition switch. On a CCD that pin is IDM and will run to the ECU.

ALPHA testers desired for CCD modules. Try as below but set to dwell control instead of 50% duty.

Here is the pinout of a typical dizzy mounted module, consult you Haynes manual if necessary.
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfiinputhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfiinputhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfioutputshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfioutputshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfioutputshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfischematicshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfischematicshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfischematicshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfisettsingshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfisettsingshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfisettsingshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfisettsingshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfischematicshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfioutputshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#tfiinput


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NOTE! ! I f you are using an aftermarket spark box l ike MSDyou can skip the special circuit and use a regular"LED17" spark output. See the MSD Output Wiring underHERE. If you do this you must also configure your

spark type as MSnS and NOT TFI in Codebase and Output Functions!!!When the code is set to TFI it expects you to use the TF I module to fi re the coil and provide cranking spark.

When using the TFI module to drive the coil carry out the following:(NOT for an MSD)

V3.0 PCB ONLY:
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignitionhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#Ignition


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V2.2 PCB ONLY:

Wiring the TFI Module

Set the Codebase and Outputs page as follows:


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Set the Trigger Angle to 10 degrees and spark output inverted to Yes.

Set the Dwell to:

For more technical details of the Ford TFI system please see this documentHERE.

GM 7pin HEI ignition

There were a number of different kinds of General Motors HEI modules:
http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/ford-Ignition-tfi-edit.dochttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/ford-Ignition-tfi-edit.dochttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/ford-Ignition-tfi-edit.dochttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/ford-Ignition-tfi-edit.doc


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* 4 pin module - electronic ignition, but doesn't do computer timing control, top left* 7 pin module (large) - electronic module that does timing control, used with coil-in-cap distributors, top right* 7 pin module (small) - electronic module that does timing control, used with some external coil distributors,

bottom right* 8 pin module - electronic module that does timing control, used with most V8 external coil distributors,

bottom left* 5 pin module - rare and not discussed here. not shown

Internal Mods for V3.0 PCB's

HEI7/8 mode will use the Opto/Hall input, so the VR components are not required.


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Internal Mods for V2.2 PCB's


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Wiring the HEI module:

In Codebase and output Functions set the HEI Ignition option, set LED17 as SparkA out and LED19 asSpark B output.


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In Spark Settings ensure "Trigger Angle" is set to 10 deg and Inverted Spark Output = NO.

Set the dwell to:

GM DIS Ignition

GM DIS Wiring--Saturn 1.9L DIS Wiring--North Star Wiring
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#gmdiswiringhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#gmdiswiringhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#satdishttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#satdishttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#satdishttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#nstarhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#nstarhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#nstarhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#nstarhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#satdishttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#gmdiswiring


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Thumb nails, clickto enlarge.

*Note: The injection events shown every 120 degrees is just for startup on the stock GM ECM, after 400 rpm isachieved the simultaneous injection event occurs once per crankshaft revolution (or twice per cycle in MS terms)
http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm6cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm4cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gmdis-6cyl-obd1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm6cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm4cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gmdis-6cyl-obd1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm6cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm4cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gmdis-6cyl-obd1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm6cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm4cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gmdis-6cyl-obd1.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm6cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gm4cyl_dis3.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/gmdis-6cyl-obd1.jpg


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In Spark Settings ensure "Trigger Angle" is set to 45deg and the Trigger Angle Addition to +45 and InvertedSpark Output = YES or the advance will be about 120 degrees from desired. Then in Codebase and Outputfunctions ensure LED17 is SparkA and LED19 is SparkB, set the Dwell to Fixed Duty - 50% Duty.

Noted that advanced displayed in MegaTune DI D NOT include approx 10 degrees of advance

The 2 connector pinouts are as follows:

Connector 1 (C1)PN#12084220 / 6-way but only 5 usedA- IGN+ (fused)B- Not ConnectedC- EST (timing signal from MS)

D- IGN REF (to MS TACH input)E- Tach (Optional)F- Bypass (5V applied by MS after engine start)* I recommend you always put an inline connector in the Bypass circuit so that you can easily drive the DIS to

base timing fail-safe mode (Bypass)


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Connector 2 (C2)PN#12084415 / 5-wayA- CKP+B- CKP-C- CKP Shield (RF Gnd)D- REF LOE- GND

Note: It's not mandatory to use Saturn Parts here. You can optionally use the DIS module and connectors from

another "MSnS-E Compatible 4 cyl Engine".

North Star

Should work for any Northstar WITHOUT coil on plug or on newer engines (not the VVT LH2) with theaddition of an older DIS module and coil pack. THIS HAS NOT BEEN TESTED ON A RUNNING ENGINEYET SO THE TRIGGER ANGLES NECCESSARY TO GET 100% TIMING ACCURACY HAS YET TO BECONFIRMED Below is the DIS waveform index for the Northstar and the DIS to MS wiring schematic

Click to enlarge
http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/northstar_dis2.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/northstar_dis.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/northstar_dis2.jpghttp://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/northstar_dis.jpg


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Buick Computer Controlled Coil Ignition (C3I)

Most of the following explanation comes from " WopOnTour"- many thanks!!I have been doing some extensive testing on the Buick 3800 Computer Controlled Coil Ignition (C3I) system forMSnS-E (Fidle as spark control) using my MS and a 2000 C3I mockup that I have. The scope waveforms and

patterns look very promising.Here's what I have learned so far (although keep in mind this was done in a mock-up state only and NOT on a running engine)

NOTE: Depending on the C3I module used you MAY have to bypass the Opto coupler within the MS dir ectly

connecting the IGN REF input at pin 24 to the opto output. The best option i s to post a thread on the

MSEXTRAforum giving detail s of your setup before you start.

In order to potentially run the C3I ignition as used by the 3800 with MSnS-E you will need to REROUTE thefollowing signals from the C3I module to the MS:

- connect the purple/white wire (C3I ignition module terminal D) to PIN24 of the DB37@Megasquirt. This C3Isignal is commonly labeled "low resolution engine speed signal" is actually a digital 3X (ie transitioning every120 degrees of crankshaft and) near identical to the old DIST REF but is synthesized by the C3I module from the18X hall-effect input (18/6=3) *NOTE-This circuit was previously routed to the oe ECM.

- connect the "IC Timing signal" (aka 5V Bypass) which is the Tan/Black wire at terminal B of the C3I ignitionmodule to pin 27@DB37 of Megasquirt. *NOTE-This circuit was previously routed to the oe ECM.
http://www.msextra.com/http://www.msextra.com/http://www.msextra.com/


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External Wiring for all MS PCB's:


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Please Note: You MAY want to make sur e there is identical ground potenti al between the MS and the C3I

module by connecting Pin L of the C3I module to the same engine ground point as your Megasqui rt.

MOST of the remaining connections at the C3I ignition module MUST REMAIN connected as factory. Theseinclude IGN+ (terminal P), Ground (terminal K) and the circuits to the various hall-effect sensors (terminals


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G,H,J,M and N) While all of these sensors are not necessary they do share a certain amount of circuitry (seeschematic) and will facilitate future possible use of these signals (for possible enhancement through wheeldecoding or maybe SFI on the MSII)

The following circuits at the C3I ignition module that can be safely removed as they went to the OE ECM.(actually it's recommended that these circuits just be either "clipped" at the ignition module to maintainconnector seal integrity or just insure they are properluy "dead-ended") So you can safely "clip the wires to IGNMODULE terminalsC (Medium Resolution Engine Speed Signal)

F (Camshaft Position Signal) andL (low reference)*The wire at E can also be clipped as AFAIK was never used anywhere.

This should work for any Buick 3800 from 1988 to present

In Spark Settings ensure "Trigger Angle" is set to 70deg.

Codebase and Output functions ensure LED17 is SparkA and LED19 is SparkB, set the Dwell to Fixed

Duty - 50% Duty

5 Cylinder Engines (Audi, etc)

For distributor based engines then this is a straight forward MSnS setup seeHERE,but for COP setups you willneed 2 trigger inputs. Whilst it is possible to do it with a cam sensor, it is easiest to do it with 2 sensors, one onthe crank and the other driven off the cam. The first sensor off the crank needs to be at least 5 teeth equallyspaced, a 60-2 wheel would be best and shouldn't be too hard as most Audi's use these anyhow. The second

sensor needs to pick up 1 pulse percam revolution. This would need a second sensor input circuit wired to Pin11of U1, the circuit would depend on the type of sensor used, but all circuits will need the opto-isolator between thesensor and Pin11 of U1. SeeHERE

Twin Cam 4G63 and 4G9 powered DSM (Eclipse / Talon / Lazer)Double Over Head Cam engines (DOHC)

V2.2 wiring mods--V3.0 wiring mods-- External wiring diagram--Megatune Settings

These instructions are based on information from Jerry atDIYAutoTune.comand from Zainal Hasnan, manythanks to both of them.This is for 1st gen DSM with the 4G63 engine as well as the 4G9 series engine:4G91 DOHC = 1.5 liter4G92 DOHC = 1.6 liter4G93 DOHC = 1.8 liter
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#MSnShttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#MSnShttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#MSnShttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2inshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2inshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2inshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#v22_4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#v22_4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#v3_4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#v3_4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#v3_4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#4g63externalhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#4g63externalhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#4g63externalhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#setg63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#setg63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#setg63http://www.diyautotune.com/http://www.diyautotune.com/http://www.diyautotune.com/http://www.diyautotune.com/http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#setg63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#4g63externalhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#v3_4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#v22_4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2inshttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#MSnS


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V2.2 output wiring mods:(the following mods will trigger the stock ignitors. It is felt that it is easier to get running using the originalignitors so this is the recommended and tested method. But if you want to drive the coils directly rather than

through the ignitors then please see theDirect Drivesection, the Spark I nvertedwill then = YES!)
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coil


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V3.0 PCB input wiring mods:

For the CMP trigger input:

For the CKP sensor input:


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External wiring diagram for 4G63 all board versions:

Settings for 4G63 all board versions:


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(Please note: The Trigger Angle setting will need adjusting more accurately using a strobe and a Fixed Angle seeHERE)(It is felt that it is easier to get running using the original ignitors so this is the recommended and tested method.

But if you want to drive the coils directly rather than through the ignitors then please see theDirect Drive

section, the Spark I nvertedwill then = YES!)
http://www.msextra.com/doc/ms1extra/MS_Extra_Software_Manual.htm#Sparksethttp://www.msextra.com/doc/ms1extra/MS_Extra_Software_Manual.htm#Sparksethttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Software_Manual.htm#Sparkset


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However, they only have 1 inner windows or vane for the tdc sensor.

To run these without modifying it to the same spec as the4G63then it is best to use MSnS mode using the outer(4 vaned) sensor and keep the distributor.


V2.2 output wiring mods:(the following mods will trigger the stock ignitors. It is felt that it is easier to get running using the original

ignitors so this is the recommended and tested method. But if you want to drive the coils directly rather thanthrough the ignitors then please see theDirect Drivesection, the Spark I nvertedwill then = YES!)

http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#4g63http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#4g63


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V3.0 PCB Output wiring MODS:(the following mods will trigger the stock ignitors. It is felt that it is easier to get running using the originalignitors so this is the recommended and tested method. But if you want to drive the coils directly rather than

through the ignitors then please see theDirect Drivesection, the Spark I nvertedwill then = YES!)

External wiring diagram for SOHC distributor based 4G63 all board versions:
http://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coil


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MegaTune Settings for SOHC distributor based 4G63 engines

(Please note: The Trigger Angle setting will need adjusting more accurately using a strobe and a Fixed Angle seeHERE)(It is felt that it is easier to get running using the original ignitors so this is the recommended and tested method.

But if you want to drive the coils directly rather than through the ignitors then please see theDirect Drive

section, the Spark I nvertedwill then = YES!)
http://www.msextra.com/doc/ms1extra/MS_Extra_Software_Manual.htm#Sparksethttp://www.msextra.com/doc/ms1extra/MS_Extra_Software_Manual.htm#Sparksethttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Ignition_Hardware_Manual.htm#2coilhttp://www.msextra.com/doc/ms1extra/MS_Extra_Software_Manual.htm#Sparkset


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1K resistor = 1.0KQBK-ND300R resistor = 330QBK-

ND18K resistor = 18KQBK-


ND


82K resistor = 82KQBK-ND

1M resistor = 1MQBK-ND0.01uF Cap = P3103-ND

0.33uF Cap = P10973-ND330pF Cap = PS1331J-ND

LM1815N = LM1815N-ND

1K resistor = 509-164300R resistor = 543-25118K resistor = 543-68839K resistor = 543-767

4K7 resistor = 543-54882K resistor = 543-8461M resistor = 544-103

0.01uF Cap = 389-09950.33uF Cap = 389-1033330pF Cap = 867-950LM1815N = 949-3913

Please note: Above part numbers will need checking, some components will come with a minimum order in multiples of 5 and10.

If fitting the above circuit external to the MS ECU then the Ne+ wire (24 tooth VR sensor positive lead)

and the G+ wire (2 tooth VR sensor positive lead) on the CAS need to be wired directly to the above

circuit:

NoteA : Connect to Ne+ wire.


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NoteB: Connect to G+ wire

The VR sensor's grounds should ALL be grounded back to the board with the lm1815 on it.

The output of U1 (above) on pin 12 should be wired to pin 6 of U4 on the megasquirt board. U4 is a six pin chipon the MS ECU board, the opto-isolator, this uses the output transistor within the opto as an inverter. The outputof U2 (above) should be wired through a 1k resistor to pin 11 on the CPU.

Output Mods for V2.2 PCB:

External wiring for V2.2 PCB:


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V3.0 PCB internal mods:

As the V3.0 PCB already has a built in VR conditioner then there's only the need to build one extra conditionerfor the 2 toothed CAS signal. The following diagrams assume the conditioner will be mounted inside the MSECU case.



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1K resistor = 1.0KQBK-ND300R resistor = 330QBK-



ND4K7 resistor = 4.7KQBK-

ND

1M resistor = 1MQBK-ND0.01uF Cap = P3103-ND

0.33uF Cap = P10973-ND330pF Cap = PS1331J-ND0.1uF Cap = P10967-ND

LM1815N = LM1815N-ND

1K resistor = 509-164300R resistor = 543-25118K resistor = 543-68839K resistor = 543-7674K7 resistor = 543-5481M resistor = 544-103

0.01uF Cap = 389-0995

0.33uF Cap = 389-1033330pF Cap = 867-9500.1uF Cap = 389-

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