2016 JAF Grand Touring Car 500 (JAF-GT500) Technical ...

2016 JAF Grand Touring Car 500(JAF-GT500) Technical Regulations

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2016 JAF Grand Touring Car 500 (JAF-GT500) Technical Regulations Article 1: Vehicle 1.1) Definition

Grand Touring Car 500 Automobile having two seats at least and one door on each side respectively for getting on and off.

1.2) Eligibility as an original vehicle

Cars produced by an automobile manufacturer, comply with legal requirements for road use and satisfy either of the following conditions:

(1) homologated in FIA Group N/A/GT2/GT1, JAF Production Touring Cars or Special Touring Cars. (2) registered with JAF as registered vehicles. (3) vehicles admitted by JAF. (4) vehicles admitted by DMSB as DTM original vehicle.

1.3) Optional parts

The use of the optional parts which are mentioned in the FIA and/or JAF homologation form or the JAF-GT main specifications register form of the cars registered with JAF is authorized.

The optional parts authorized by the DMSB may be used for the vehicle which is certified as a DTM original vehicle by the DMSB.

Article 2: Regulations 2.1) Modifications

Any modifications which are not permitted in this Chapter are prohibited.

General prescriptions and Safety Cars must comply with the following requirements of Appendix J. Art.252 "General prescription" and

Art.253 "Safety Equipment", which are not already covered in these regulations. - 252.1) General remarks

＊ except for Art.252.1.2 - 252.2) Dimension and Weight - 252.3) Engine - 252.4) Transmission - 252.5) Suspension - 252.6) Wheels - 252.7) Bodywork / Chassis / Bodyshell


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＊ Replace Art.252.7.3 "Cockpit" by the following text. ・Cockpit

The cockpit is that volume of the vehicle separated from the rest of the vehicle by fixed front and rear bulkheads. For 2-volume vehicles, the cockpit is that volume between the front bulkhead and the bulkhead behind the rear edge of the rear-most seat. Remaining inner space behind that is referred to as the luggage compartment. The bulkheads must be constructed of highly flameproof rigid materials. The cockpit must be completely insulated by the bulkheads from the engine compartment, fuel tank, oil tank, gearbox, propeller shaft, and all joints of piping and tubing (connecting these areas). Any and all devices/substance that is potentially dangerous to the vehicle driver must be installed outside of the cockpit (on the other side of the bulkhead). Only the following accessories may be installed in the cockpit.

* Spare wheels * Tools * Spare parts * Safety equipment * Communication equipment * Ballast (if permitted) * Windscreen washer water container * Equipment for cooling suit

On 2-volume vehicles, the oil tank may be installed to the luggage compartment provided that bulkheads are used to protect against oil leakage and sparking.

＊ except for Art.252.7.7 - 252.8) Electrical system - 252.9) Fuel - Combustive

＊ Refueling tank must comply with drawing 252-7 with fuel hose of maximum 5m in length, but flow restrictor is not mandatory.

- 252.10) Brakes - 253.1) Dangerous car - 253.2) Optional device - 253.3) Lines and Pumps - 253.4) Safety of braking and Steering systems - 253.5) Additional fasteners - 253.6) Safety belts - 253.7) Extinguishers - Extinguishing systems - 253.8) Safety cages - 253.9) Rear view - 253.10) Towing eye - 253.11) Windows / Nets

＊ Except for the following text


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"The windows must be certified for road use, their marking standing as proof." ＊ Add the following text.

Anti-dazzling treatment may be applied as a strip along the upper edge of the glazed surface. The width of the strip must not exceed 100 mm.

- 253.12) Safety fixing device for Windscreen - 253.13) General circuit breaker

＊ Replace text "As for the outside, the triggering system of the circuit breaker will compulsorily be situated at the lower part of the windscreen mounting of the driver's side for closed cars" by "As for the outside, the triggering system of the circuit breaker will compulsorily be situated at the lower part of the windscreen mounting of the opposite side of driver's side for closed cars"

＊ Add the following text. In vehicles whose design makes it impossible to install the circuit breaker close to the lower part of front windscreen mounting bracket, the circuit breaker may be installed outside either of the passenger side center pillar or the quarter pillar, which permits operation from outside.

- 253.14) FIA approved safety fuel tanks - 253.15) Protection against fire - 253.16) Seats, attachments and supports - 253.17) Pressure control valves

However, if the prescriptions which have the same meaning as those of the above Articles are defined

in this Chapter, prescriptions in this Chapter should be obeyed. 2.1.1) Material restrictions 2.1.1.1) Composite material (Including carbon and aramid fiber)

If only the use of the material is authorized in this Chapter or the use of the material is standardized on the specific parts or areas of the original vehicle, these composite materials can be used in the relevant parts or areas.

2.1.1.2) Titanium, ceramics and beryllium

Regardless of the provisions of the present regulations, the following must be respected. The use of these materials is permitted only for brake caliper pistons, hub bearing, heat shield, front

diffuser, skid block of flat bottom and parts expressly permitted under Art.5 Engine 5.1.16) "Restriction on materials" of these regulations, or for the specific parts or areas to which these are originally used on the original vehicle.

2.1.1.3) Aluminum alloy

Regardless of the provisions of the present regulations, the following must be respected. The use of aluminum alloy which has a modulus of elasticity greater than 80Gps is forbidden except

for brake calipers. 2.1.1.4) The other materials


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Regardless of the provisions of the present regulations, the following must be respected. The use of a material with a specific gravity greater than 12.0 is forbidden.

2.1.2) Control function restrictions

1) Any automatic or electronic chassis control system or function is forbidden, even if the original vehicle has it. This includes the systems listed in the Appendix 1 of this Chapter.

A simple open-loop electrical switch activated by the driver acting on a system is not considered to be electronically controlled.

2) In order to avoid any dispute over the use of prohibited control functions, it is not permitted to install speed sensors on the driven wheels and the power-train system. However maximum two sensors per car installed solely on the non-driven wheel is authorized.

In order to verify the nonuse of prohibited control functions, organizers may designate cars and require them to install more than one sensor with permission of JAF.

3) It is permitted to use (add) a speed limiter in order to comply with the speed limit in the pit lane.

2.2) Compliance with the rules and regulations It is the duty of each competitor to give an explanation and accept any checks at the request of the

scrutineers and the Steward of the Meeting of the event concerned in order to satisfy them that his car complies with the rules and regulations in their entirety at any time during an event.

2.3) Measurements

During the event, all required measurements will be made at the location specified by the chief scrutineer and with measuring instrument and apparatus which will be provided by the event organizer. No protest can be accepted against these measurement site, measuring instruments and/or equipment, and measurement methods.

Article 3: Bodywork and exterior dimensions

Save the modifications authorized in this Chapter, dimensional specifications and tolerances of the original vehicle mentioned in the homologation form and documents in relation to the registered cars and also their outer shapes without bolts for fitting must be maintained. 3.1) Dimensions 3.1.1) Upper part of the design line (3.3.1)

1) Overall length is 4,650mm. 2) Front overhang is 875mm. 3) The length behind the center of the front wheel axle is 3,775mm. Tolerance of +/-6mm is permissible for these dimensions (excluding rear wing and rear wing

support) which were submitted to and approved by the JAF as defined in 3.3.2) below. 3.1.2) Lower part of the design line(3.3.1)


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1) Overall length must not exceed 4,725mm. 2) Front overhang must not exceed 925mm. 3) The length behind the center of the front wheel axle must not exceed 3,800mm (excluding rear wing and rear wing support, front splitter and rear diffuser).

3.1.3) Maximum overall length of car including front splitter is 4,775mm (excluding rear wing and rear wing support).

3.1.4) Maximum height

The dimension from the bottom surface of the flat bottom to the top of the roof (roof reference plane without local projecting shape, roof rail and auxiliaries such as antenna) must not be less than 1,150mm when measured perpendicular to the bottom surface of the flat bottom. In order to comply with this rule, it is permitted to remove the side sill and the floor, and downward raise of the side sill and moving of the position of the floor are also permitted.

3.1.5) Ground clearance

Obey the prescriptions defined under Art.3.3.9.2) "Skid block". 3.1.6) Wheelbase

The dimension of the wheelbase must be 2,750mm+/-10mm. 3.2) Windows 3.2.1) Front window

The front windshield must be in accordance with the rules under Article 9 of Chapter 4 Safety regulations for homologated cars and registered vehicles. However it is permitted; 1) that the part below the outer perimeter of the rear edge of the bonnet when viewed from the front is

removed. 2) that a colorless transparent film is attached to the surface of the front windshield in order to protect

it. 3) that the material of the front windshield is changed into polycarbonate of which thickness is no less

than 5.8mm instead. 4) Fitting method is free providing the configuration is not significantly modified and enough strength

is maintained. 3.2.2) The other windows

1) The window glass may be replaced with polycarbonate which must permit the cockpit interior to be visible, provided the same installation position, thickness, and shape as the original glass are maintained.

However the thickness must be no less than 2.8mm for side window and no less than 3.8mm for rear window.

If the rear quarter window is changed into polycarbonate, it is not necessary that the cockpit interior


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be visible by the bracket for fitting quick refuel valve. 2) Door window glass

If the door window glass is maintained, operational method and regulating system of the door window glass may be changed in order to keep its function.

3) Following the removal of auxiliary accessories such as weather stripping and molding, it is permissible to install the window glass (except door window glass) directly to the vehicle bodywork.

4) A partition window may be replaced with a firewall. 5) When a tinted glass or a window film is used for side or rear windows, a driver inside the car must

be visible at a distance of 5 meters. 6) Openings may be made in rear windows according to the following conditions:

i) For ventilation of cockpit: Within 80mm from both sides along the edge of the rear window, 200mm from the top, and the

total surface of the holes should be no less than 10,000mm2 and no more than 30,000mm2. The number of the holes is free.

ii) For heat dissipation and cooling of air conditioning system: One hole of which width is no greater than 1,200mm and the surface of no more than 40,000mm2.

This hole may be made only if an air conditioning system is fitted.

Drawing 8-1

3.3）Bodywork 3.3.1) Design line

Design lines are defined to be the bold lines shown in the Drawings 8-2,8-2a and 8-2b.

Drawing 8-2: Design line - side view

Direction of move

the bottom surface of

the flat


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Drawing 8-2b: Design line - front view

3.3.2) Exterior shape of the body situated above the design line

All areas of a competition vehicle situated above the design line that is in contact with the external air stream when its doors and windows are closed must keep the shape which is submitted to and approved by the JAF.

3.3.3) All areas of a competition vehicle situated below the design line may be designed freely in

accordance with these regulations but must keep the shape which is submitted to and approved by the JAF as those above the design line.

3.3.4) Changes in bodywork materials

Materials of the bodywork may be changed. 3.3.5) Door

1) For the door configuration, it is permitted that its area between the bottom surface of the flat bottom and up to 275mm above it is removed, but the shape of the other part must be original. The back of the door configuration may be altered.

2) Door hinge can be changed only for the purpose of giving the driver a quick escape from the car during accident. If a door hinge is included in the part removed under 1) above, the relevant door hinge may be changed.

3) If the door mirrors are moved, opaque area of original door mirror bases can be designed as transparent member integrated into door window.

3.3.6) Openings made in the bodywork 3.3.6.1) Openings in the bonnet (including engine-cover), rear hatch gate and boot-lid

1) They may be made to allow dissipation of heat and cooling provided the configurations of these

Drawing 8-2a: Design line - rear view

the bottom surface of the flat bottom


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covers are not modified substantially. The openings are also allowed to be closed providing the closed areas keep the original shapes or form outer enveloping surfaces.

2) They may be made in the rear hatch gate and boot-lid to allow dissipation of heat and cooling provided the configurations of these are not modified substantially.

3.3.6.2) Opening on fender

1) Cut-out (exit hole) may be created on the fender situated rear of the rearmost part of the front/rear complete wheel to permit the escape of air used to cool the brakes. The inside must not be visible through this exit hole when viewed from above and the side.

2) Openings which are connected to the duct permitted under Art.10.3)"Cooling of brake" may be made on the rear fender situated below the plane 325mm above the bottom surface of the flat bottom. However when viewed from above and the side these openings must not permit the inside structure to be visible other than that of the duct connected to an opening concerned.

3) Opening may be made on the surface above wheel arch within the following area however the complete wheel must not be visible when viewed from above:

Between 200mm forward of and 150mm behind of the center of the front wheel axle. Between 850mm and 965mm from the longitudinal center line of the car.

3.3.6.3) Opening on ceiling

1) There must be a square opening measuring at least 420mm × 420mm (with a tolerance of +/-5mm) above the driver's helmet for extrication of the driver. The corners of the opening can be rounded with a maximum radius of 80mm.

2) The opening must be closed by a cover. The cover must be able to be operated from outside by a release fastener. The parting line created by

the cover must have a clearance of maximum 2mm and the gap must not be filled up by decorative strip.

3) Opening for a lifting device There must be an opening for insertion of lifting apparatus on the socket for lifting the car. It is permitted that a sticker readily removable is fitted to the opening.

3.3.6.4) The other openings

Openings situated at the rear (surface) of the bodywork, which are made as a result of removal of auxiliaries etc. must be covered with a very fine wire mesh or a punching metal etc.

3.3.7) Hinges of bonnet (including engine-cover), rear hatch gate and boot-lid

Hinges may be removed provided bonnet, rear hatch gate and boot-lid are securely fastened at least 4 points by fasteners defined under Art.3 "Addition of fasteners" of Chapter 4 Safety regulations for homologated cars and registered vehicles and they do not open during the vehicle in motion.

Where the engine or the fuel tanks are installed, these fasteners must be able to remove without tools. The fasteners must be clearly indicated by a red (or contrastive color) arrow.


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3.3.8) Bodywork (monocoque structure) and bulkhead 3.3.8.1) Bodywork (monocoque structure)

Only a monocoque structure designated by the JAF is accepted.

3.3.8.2) Front bulkhead (including cowl top) 1) Original front bulkhead may be removed for installation of a new bulkhead which isolates the cockpit

entirely. However, if the cowl top is also removed the supporting structure for the lower edge of the front window must be newly constructed. The material and the shape of the cowl top cover are free. But it must not protrude from the perimeter of the rear edge of the bonnet when viewed from the front.

2) Opening which is connected to the opening defined under Art.3.3.6.1) is permitted for the purpose of ventilation of the cockpit provided the isolation function is maintained. If the vent of the cockpit is connected to the duct installed at the back of the bonnet (including engine-cover), the connected part must be of the structure which can prevent fire from intruding into the cockpit when a fire brake out in the engine compartment.

3) The shape and material of the front bulkhead, structure of connection of the openings defined under Art.3.3.6.1) or a part which seals the openings existed originally:

Shape: free Material: rigid and sufficiently fireproofing materials which comply with the following conditions:

3.3.8.3) Rear bulkhead

The shape and material of the rear bulkhead, structure of the connection of the openings according to 3.3.6.1-2) or a part which seals opening existed originally.

Shape: Free Material: The bulkhead or the part must be made of a rigid and sufficiently fireproofing material.

3.3.9) Bodywork structure fore of the front bulkhead and hind of the rear bulkhead

Only a tubular frame structure submitted to and approved by the JAF is accepted. 3.3.10) Flat bottom, Skid block 3.3.10.1) Flat bottom

It is obligatory to install a flat bottom which is regulated by the JAF. 3.3.10.2) Skid block

It is obligatory to install a skid block which is regulated by the JAF.

3.3.11) Maximum exterior shape The maximum exterior shape must not exceed the area shown in the Drawing 8-3 except for the

following exceptions. Exceptions: 1) Rear wing and the parts of rear wing support


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2) Exterior mirror 3) Parts of front splitter 4) Flick box (Canard) 5) Rear diffuser 6) Wheel located lower than the point 275mm from the bottom surface of the flat bottom.

Drawing 8-3

3.3.11.1.1) Front bumper

1) Modifications are allowed within the area of the exterior shape beneath the design line. 2) There are no restrictions on reinforcement members for the inside of the bumper.

3.3.11.1.2) Rear bumper

1) Modifications are allowed within the area of the exterior shape beneath the design line. 2) There are no restrictions on reinforcement members for the inside of the bumper.

3.3.12) Fenders

1) Fender situated lower than the design line may be widened up to 1,950mm -0/+6mm within the overall width of a car. The front part of the front fender and rear part of the rear fender must be fit within the area defined under Article 3.3.11) "Maximum exterior shape" when seen from above.

The rear edge of the front fenders must not extend over the parting line at the front edge of the doors.

Drawing 8-4

Front axle centerline

Parting line at the front edge of the doors Fender cannot be extended to the rear of the line


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3.3.13) Tire housing 3.3.13.1) In order to allow the tire housing to accommodate the front/rear complete wheel, an independent

tire housing which is formed by the planes inside of wheel arch must exist regardless of the structure of the original vehicle. There are no restrictions on tire housing materials. 1) The shape of the tire housing 2) Louver can be installed in the front fender.

3.3.14) Hard top for open cars

Provided the following conditions are observed, hard top for open car may be installed. 1) Configuration: If the original open car has a soft top or a hard top as its optional parts, the hard top

which may be installed must maintain its configuration similar to the original. 2) Material: must be rigid and sufficiently fireproofing material. 3) The highest point: The highest point indicated in the 3-view-drawing of the catalogue of the vehicle

concerned should be regarded as the highest point of the car. 4) Fixation: There is no restriction on its fixation method to the bodywork. However fixing to rollcages

may be authorized only if there is no need to carry out any modification to the rollcages.

3.3.15) Vehicle interior With the exception of the luggage compartment, any mechanical structural element must not exist

other than that is originally installed in the vehicle interior. Modification and replacement of the dashboard (instrument panel) are permitted. But complete

removal of the dashboard (instrument panel) is not permitted. Flexible air ducts made of non flammable material may be installed to the vehicle interior for the

purpose of cooling the driver and various auxiliary equipment (electrical equipment), however it must not obstruct driver's visibility and extrication in case of emergency.

Oil tank installation to the vehicle interior (cockpit) is not permitted.

3.3.16) Reinforcement Reinforcement of the bodywork (including bulkhead) is free provided it does not encroach on the

spaces inclusive of driver's and passenger's compartments.

3.3.17) Auxiliary accessories Auxiliary accessories which do not have any influence upon car's behavior may be either installed

or removed. This includes equipments which enhance comfortableness, insulating material and unnecessary supports which are not used as well as moldings, and also any attached wiring.

3.4）Aerodynamic device

Any aerodynamic device must be secured rigidly to the bodywork and no movement is permitted between them save where these regulations require otherwise. 3.4.1) Front aerodynamic device (Splitter)


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1) It is obligatory to install front splitter regulated by the JAF. 2) Additional parts may be installed in the following area (called flick box area): In side view, upper than the front diffuser and no less than 300mm forward of the center of the front

wheel axle and also lower than the design line. In plain view, inside of the exterior line of the front diffuser and outside of the exterior line of the front skirt and also outside of the exterior line of the bodywork.

3) The outer surface of the vehicle to which the additional parts are attached must keep the shape submitted to and approved by the JAF.

3.4.2) Rear aerodynamic device

As a rear aerodynamic device, a rear air spoiler and a rear wing may be installed provided the followings are observed:

3.4.2.1) Rear spoiler This may be installed in the area of upper surface of the boot lid, 575mm both sides from the

longitudinal center line of car and 3,725mm from the center of the front wheel axle and also 800mm above the bottom surface of the flat bottom.

3.4.2.2) Rear wing and rear wing stay 1) It is obligatory to install the rear wing and the rear wing stay which are designated by the JAF. 2) Number of the device should be one unit. 3) The wing should be one and any part of the aerofoil section should be able to fit in a 380mm

long×200mm high rectangle (including gurney-flaps, excluding supports and end plates). 4) Its maximum height should be 1,160mm above the bottom surface of the flat bottom. 5) The maximum width is 1,390mm (including supports and end plates). 6) It should be placed above the perimeter of the bodywork and the parting line of the rear fender when

viewed from the side, or on the surface of the boot-lid (engine-cover). (It is not permitted to install any aerodynamic device onto the rear fender.)

7) It should be situated behind a plane vertical to the bottom surface of the flat bottom and passing through the center of the rear wheel rotational axle.

8) The frontal edge and the lateral edges including end plates should have a radius of no less than 4mm. 9) The shape and materials are free. When installing the device to the boot-lid, it is permissible to install

reinforcements to the inside of the boot-lid to provide greater rigidity for the fixation of supports. 10) The boot-lid or rear hatch gate etc. should be able to be opened and closed without removing any

structural part. 11) Thickness of the end plates should be no less than 10mm.

3.4.3) Aerodynamic devices beneath the rear floor

Rear diffuser regulated by the JAF must be installed.


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Article 4: Weight 4.1) Minimum weight

Minimum weight must be kept at 1,020kg. 4.2) Ballast

It is permissible to install one or more ballast to fulfill the requirement of the minimum weight. The position and the installation method of the ballast are free, but both the ballast and the bodywork part to which the ballast is fixed must have sufficient strength.

Article 5: Engine

Free except the followings: 5.1.1) Type and cubic capacity of engine

The only engine permissible is a supercharged direct injection in-line four cylinder engine with the cylinder capacity less than 2,000cc and was approved by JAF. Engine application must be made at least two months before an event in which the relevant engine is used for the first time. The application may be made only once per season.

5.1.2) Position of engine

Engine must be positioned in the car in the installation position of the original vehicle with longitudinal orientation.

5.1.3) The crank axis must be positioned in the direction of the longitudinal line of car and the cylinders must be in vertical position. 5.1.4) There shall be one injector per cylinder. 5.1.5) Valves per cylinder shall be two for intake and two for exhaust. 5.1.6) Valve spring shall be a coil-type 5.1.7) Maximum number of the camshaft is four two. 5.1.8) Variable valve timing is prohibited. 5.1.9) Variable compression ratio system is prohibited. 5.1.10) Height of the deck is not limited. 5.1.11) Diameter of the bore is 88 +/- 2.0mm.


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5.1.12) Diameter of the pin and diameter of the main journal for the crankshaft are free. 5.1.13) Crankshaft bearing shall be a plain bearing. 5.1.14) The distance between the center of the crank and the bottom surface of the sump is 100mm

minimum. 5.1.15) The overall length of the engine (between both mounting surfaces of fore and aft of the engine) is

500+/-0.5mm. 5.1.16) The minimum weight of the engine is 85kg. The following parts are not included for the

measurement of this weight: Alternator, starter, flywheel and stud bolts, oil, water, ECU, exhaust pipes and their gasket (between

the head and the exhaust pipe), air filter, a set of clutch and heat insulating board. 5.1.17) Restriction on materials

The following restriction on materials is applied: a) The following parts must be made of aluminum alloy or ferrous alloy: Cylinder head cover, cylinder head, cylinder block sump, front cover, rear cover and cylinder liner

(sleeve) b) The following parts must be made of titanium ally, ferrous alloy or nickel alloy: Valve, valve spring retainer, valve cotter and turbo center housing. c) The following parts must be made of ferrous alloy: Camshaft, valve spring, piston pin, crankshaft, connecting rod and flywheel. d) The following part must be made of aluminum alloy: Piston e) The following parts must be made of cobalt, iron or nickel-based alloy: Bolts and nuts. f) Ceramics can be used for the following parts: Ignition plug and sensors. g) Intermetallic compound and magnesium alloy are prohibited (magnesium alloy can be used solely for turbo compressor housing). h) Diamond Like Carbon Coating(DLC) is prohibited for : Piston and cylinder liner (sleeve).

5.1.18) Supercharging device

Only one specification of supercharging device that is submitted to and approved by the JAF may be used.

5.2) Engine modifications


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The following parts must be maintained as produced by the manufacturers: (1) Cast crank case assembly (7) Distance of the centers of the bores (sump and block) (8) Oil pump (2) Cast cylinder head (9) Water pump (3) Ignition plug position (10) Scavenge pump (4) Angle of valve (11) Position of camshaft (5) Crankshaft (12) Gear for cam driving (6) Distance of the centers lines of the valves (13) Min. diameter of bearing

5.2.1) Fuel system

1) Fuel pump It is obligatory to use high pressure pump and pump cam profile that are submitted to and approved

by the JAF. It must not be installed inside of the cockpit and outside of the bodywork.

2) Fuel flow restriction system It is obligatory to install a fuel flow restriction system that is submitted to and approved by the JAF.

3) Fuel pressure Max.200 bar for high pressure side and max. 8 bar for low pressure side.

4) Fuel injector It is obligatory to use a fuel injector that is submitted to and approved by the JAF. One per cylinder

5.2.2) Ignition system

One ignition plug per cylinder 5.2.3) Lubricating system

When viewed from above, the oil cooler must not protrude from the vehicle perimeter.

5.3) Air intake system The use of a variable inlet ports, air intake adjustment devices and variable intake trumpet is not

permitted.

5.3.1) Intercooler There should be one intercooler for cooling the intake air and the specifications of its core (finpitch,

thickness) should be those submitted to and approved by the JAF. Any device, system, procedure, construction or design which have the purpose and/or effect

decreasing the temperature of air supplied for the engine other than the intercooler are forbidden. 5.4) Cooling 5.4.1) The specification of a core of water radiator should be that is submitted to and approved by the JAF.

For the purpose of cooling the water radiator, oil cooler and each engine part, only air is permitted


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and other cooling method by injection or spraying of any substance other than air into them is prohibited. 5.4.2) Use of a heat exchanger is authorized.

5.5) Exhaust system

The exhaust system is free. However, 1) at least one catalytic unit must be installed through which all exhaust gases should pass. The unit

must be approved by JAF. 2) variable exhaust systems are not permitted. 3) FAS (Fresh Air System) pass (piping of anti-lag system) is prohibited. 4) The engine exhaust of FR vehicle must exit from the limited area between 1,350mm and 1,600mm

from the center of the front wheel axle and between 150mm and 400mm from the bottom surface of the flat bottom.

5) The engine exhaust of MR vehicle must exit from the limited area between 250mm and 500mm from the right rear face of the vehicle and between 210mm and 460mm from the bottom surface of the flat bottom.

5.6) Engine control computer

It is obligatory to use engine control computer that is designated by the JAF. Article 6: Lines and pumps, and fuel tanks

Free as long as Articles 6.1), 6.2) and 6.3) are observed. 6.1) Fuel tanks

It is obligatory to install a safety fuel tank that is designated by the JAF. It is obligatory that a flexible joint be used for the junction of the fuel tank and fuel filler neck, which

can allow bodywork deformation in some degree and avoid any leakage of fuel.

6.1.1) All safety fuel tanks must be situated in the defined position in the monocoque structure designated by the JAF.

Leakage of the fuel must not be accumulated and careful attention should be paid for it so as not to go into the cockpit.

6.1.2) The use of self sealing breakaway valve for all fuel lines between the fuel tank and the engine is

considered desirable. This valve must operate at less than 50% of the load required to break the fuel line fitting or to pull it out of the fuel tank.

6.1.3) Unless the tank fillers are connected directly to the tank, it is recommended that a valve supplied by

the tank manufacturer be installed at the top of the tank. The valve should permit sealing the fuel tank in the event of the filler being knocked off during an accident.


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6.2) Fuel capacity

The maximum amount of fuel which may be carried on board is 100 liters. The total fuel tank capacity may be reduced with notice in advance.

6.3) Cooling of fuel It is permissible to install cooling device to the fuel supply piping mounted on the vehicle for the

purpose of decreasing the temperature of fuel. The only method allowed for cooling fuel is air-cooled method by natural air stream.

Article 7: Electrical Equipment 7.1) Battery

Only sealed batteries designated by the JAF are permitted. Insulation to prevent shorting must be installed.

The battery may be mounted anywhere except in the area of the driver's seat. 7.2) Lighting

Indicators, by which the driver may recognize whether the headlight and/or the direction, must be fitted.

7.2.1) Headlights

Headlights must remain in their original position. Their configuration and function of the original vehicle must be maintained. The main optical axis must be to the front. Brightness (light intensity) must be at least equal to that of the original vehicle's headlights so that the lightening can be recognized by the drivers of the cars running in font and the officials around the track. Right and left lights must not be illuminated by turns.

It is authorized to alter a light source for the purpose of increasing illumination (or luminous intensity).

If the vehicle is originally equipped with retractable headlights, the retracting mechanism may be removed and modifications with transparent materials may be carried out so as to lighten the front of the vehicle.

7.2.2) Other lights 7.2.2.1) Tail light and brake light

Tail light and brake light must have the same configuration as those of the original vehicle. Brightness (light intensity) of these lights must be equal to or greater than that of the original lights.

7.2.2.2) Direction indicators

The lightening of indicators must be recognized by the drivers of the cars running in front/behind


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and the officials around the track. There is no restriction on side markers including its removal.

7.2.2.3) Rain light

One of the following rain lights defined below must be fitted to the rear of the car which is in working order throughout of an event. (1) Rain light that is approved in accordance with ECE R38 road standard (or an equivalent or stricter

standards from another country). (2) One rain light approved by the FIA (Technical List No.19). (3) Rain light which has an equivalent brightness as (2) above and comply with the following rules:

- The surface of the lens that is visible from the rear of the car is 30cm2 minimum and 140cm2 maximum.

- Luminous intensity is no less than 150cd and no greater than 300cd. - Luminescent color is red only. The rain light must fulfill the following conditions: - Emission pattern of the light is solid only. - Independent circuit should be secured for the light apart from the other optical circuit. - It shall be perpendicular to the centerline of the car and faced toward the rear of the car. - It should be clearly visible from the rear. - It should be installed within 10cm from the centerline of the car. - It should be at least 35cm above the bottom surface of the flat bottom. - The surface of the lens should be at least 45cm behind the centerline of the rear wheels when

measured parallel with the bottom surface of the flat bottom. - It should be able to be switched on by the driver when seated normally in the car. The three measurements are taken to the center of area of the lens.

7.2.2.4) Other lights

Ducts can be connected to openings which are created by removal of the original lights. 7.2.3) Wiper

It is permissible to change the front window wiper construction. However at least one wiper must be equipped and it must be able to be operated by the driver seated and activated effectively at any time during an event.

The wiper motor designated by the JAF must be used.


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Article 8: Transmission 8.1) Drive system

Only rear drive system is permitted regardless of the system used in the original vehicle. Kinetic Energy Recovery System may be used providing the system is submitted to JAF and

approved according to the "Supplementary regulation for Kinetic Energy Recovery System". 8.2) Clutch

The clutch designated by the JAF must be used. The conditions set out in the Article 2.1.2) "Control function restrictions" should be respected.

8.3) Transmission and transmission control lever

The gearbox designated by the JAF must be used. It must comprise a maximum of 6 ratios and a reverse gear.

Paddle shift system may be used. 8.4) Final drive system and differential

The final drive system and differential of the gearbox designated by the JAF must be used. Only the ramp angle of 45/65 may be used. The differential direction is Free. The conditions set out

in the Article 2.1.2)"Control function restrictions" should be respected. 8.5) Propeller shaft and drive shaft

The propeller shaft and drive shaft designated by the JAF must be used.

8.6) Cooling Only air cooling of the transmission is permitted. Injection or spraying of any substance other than

air to cool the brakes is prohibited. Mounting of oil cooler is free.

Article 9: Suspension and steering 9.1) Suspension type and installation

Suspension type on the original vehicle may be freely modified and altered. 9.2) Anti-rollbar

There are no restrictions on anti-rollbar including their installation brackets provided the conditions set out in the Article 2.1.2) "Control function restrictions" are respected.

Adjustment of anti-rollbar by driver when the car is in motion is prohibited. 9.3) Axles


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There are no restrictions on axles including spindles. They may be changed into Center locking type.

9.4) Springs There are no restrictions on springs including the addition of supplementary springs provided the

conditions set out in the Article 2.1.2) "Control function restrictions" are respected.

9.5) Shock absorbers The shock absorbers designated by the JAF must be used. The conditions set out in the Article 2.1.2)

"Control function restrictions" should be respected. 9.6) Suspension arms

All suspension arms must be made of metal. 9.7) Chromium plating

Chromium plating of steel suspension arms is not permitted. 9.8) Steering

Steering wheel, steering system (steering gearbox, link) and steering wheel must be connected solely by mechanical means.

9.8.1) The power steering designated by the JAF must be used. Power steering is permitted to use only if

it is a single system without a programmable control. The power steering pump must be the one that is designated by the JAF.

9.8.2) A quick release system specified by the JAF must be installed on the steering wheel. The quick

release system must have a triggering system of the type pulling a concentric flange situated on the steering column.

9.8.3) Shape of the steering wheel is free. 9.8.4) It is recommended to install a steering column with an impact absorbing device. Article 10: Brakes 10.1) Brake system

It is obligatory to use the brake system designated by the JAF. The conditions set out in the Article 2.1.2)"Control function restrictions" should be respected.

However, there must be no sensors or devises other than a fluid pressure sensor, a brake light switch and a proportional brake valve on the lines between master cylinder and caliper.

Parking brake installation is optional. However if it is installed, the regulations of Art.2.2.2)"Parking


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brake" in the Chapter 4 "Safety regulations for homologated cars and registered vehicles" must be respected.

10.2) Brake calipers It is obligatory to use the brake calipers designated by the JAF.

10.3) Brake cooling

Only air cooling and water injection cooling of the brakes is permitted. Injection or spraying of any other substance to cool the brakes is prohibited.

Air ducts for cooling the brakes may be installed. However, the shapes of these ducts must not permit the aerodynamic effect.

Air ducts may be connected to the openings permitted under Art.3.2) "Window", 3.3.5) "Openings made in the bodywork", 3.3.11) "Fender" and 3.3.12) "Tire housing" except opening made in the ceiling, however they are not permitted to intrude into front and/or rear bulkhead.

There is no restriction on the number and size of air ducts used to cool each brake assembly. There is no restriction on air duct material.

10.4) Brake discs / Brake pads

The brake disc/ brake pad designated by the JAF must be used for each wheel. Article 11: Wheels and tires 11.1) Maximum dimensions of a complete wheel are as follows:

Front: Max. width 336mm, Max. outer diameter 685mm Rear: Max. width 356mm, Max. outer diameter 712mm

11.2) Wheel 11.2.1) The size of a wheel is the front:12J-18 and the rear :13J18. 11.2.2) The minimum weight of a wheel is:

Front:9.5kg Rear: 10.0kg

11.2.3) Wheel material

Wheel material is aluminum #5*** and #6*** alloy group only. Accessories of wheels are permissible only if they do not exceed the maximum width of the complete

wheel and are secured by bolts etc. 11.3) Wheel attachment

Wheel attachment is free, if a single center nut, a red or dayglo orange safety spring or a device/system performing the same function as the said spring must be installed to each wheel when the


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car is in motion. The safety spring or the similar device mentioned above must be installed after each wheel change.

11.4) Pneumatic jack

It is obligatory to use the pneumatic jack designated by the JAF. Article 12: Safety equipments and devices

All the regulations concerning safety are completed by adding the following to the Chapter 4 "Safety

regulations for homologated cars and registered vehicles" and applied. 12.1) Safety belts

The wearing of two shoulder straps, one abdominal strap and two straps between the legs is compulsory.

Safety belts must comply with FIA standards 8853/98. Each strap of the safety belt must have its own fixation point on the bodywork. Two abdominal straps

for right and left respectively can be prepared as long as they have the same homologation numbers and the two abdominal straps on one side may be attached together by one attachment point on the body.

12.2) Rear view mirrors

It is permitted to remove an inside mirror or replace it with any other system of equivalent efficiency, when the bulkhead extends from the floor to the ceiling under the prescriptions mentioned in 6.1.1), or when a partition window serves as a bulkhead as defined under the Art.17" Protection against fire" of the Chapter 4 "Safety regulations for homologated cars and registered vehicles", regardless of the provisions under Art.7 "Rear view" of the Chapter 4 "Safety regulations for homologated cars and registered vehicles". However, in this case, the rear view must be secured, and outside mirrors which are the same as those of the original vehicle or which have at least 100cm2 must be mounted on the both side of the outer surface of the bodywork.

12.3) Seats and Headrest

It is obligatory to use the headrest designated by the JAF. Headrest must be able to retain the driver's head wearing a helmet and must not have it move rearward during acceleration. The driver's head must not be caught between the headrest and rollover bars. It is recommended that the distance between the sides of the headrest should not exceed 400mm and that energy absorbing material of minimum 20mm is fixed to the both sides.

12.4) Elements between the door and the driver's seat

Between the door and the driver's seat, no mechanical components may be installed other than side bars of the rollcage and a lever of pedal slider.

However, the impact absorbing structure, the knee pad, the water-supply bottles and ducts are not


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considered as mechanical components. 12.5) Frontal/back protection structure

It is obligatory to install shock absorbing structures designated by the JAF at the front and the back faces of the car.

12.6) Lateral protection structure

It is obligatory to install lateral shock absorbing structures designated by the JAF. 12.7) Extinguishing equipment

Installation of the automatic extinguishing equipment defined by Art.253.7.2 of the Appendix J and designated by the JAF is compulsory.

Article 13: Other requirements 13.1) Guards and Supports

Installation of radiator guard, tank guard and sump guard is permitted. However the prescriptions defined under the Article 3.3.8)"Bodywork structure fore of the front bulkhead and hind of the rear bulkhead" must be satisfied.

Other than magnesium, there is no restriction on materials. 13.2) Handicap weight installation devices

In order to enable handicap ballast to be installed, weight installation device (rigid construction) must be equipped at the place where scrutineers of the event concerned can easily check it.

Article 14: Final Text

The final text for these regulations shall be the Japanese version should any dispute arise over their interpretation.


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Appendix 1 Article 2 2.1.2) Examples of prohibited systems according to the restrictions

on control functions

Prohibited system etc. 1

Anti-lock braking system(ABS)

2

Traction control system

3

Automatic gearbox

4

Power actuated clutch

5

Electronically or automatically adjusted final drive differential system (ex.: Differentials with air pressurizing or hydraulic slip control with electronic control and / or outer pump)

6

Electronically or automatically adjusted shock absorber, suspension or ride height adjustment

7

Four-wheel steering

8

Moveable ballast

9

Electronic control systems with closed-loop circuit other than engine

10 Devices that allow a driver to adjust shock absorber and suspension springs from the driver's seat when the car is in motion

11 Telemetry 12 Active suspension

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2016 JAF Grand Touring Car 500 (JAF-GT500) Technical ...

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