Influence Of Mileage On Tire Performances - Goodyear · Goodyear Michelin Control tire: new...

TÜV SÜD Automotive GmbH

Test Results Of Summer Tires 225/45 R17 94W

Abstract of Test Report No. 76230122

Influence Of Mileage On Tire Performances

TÜV SÜD Automotive GmbH • TÜV SÜD Group

Project

Description

TÜV SÜD Automotive

Objective

Some of the properties above were examined on used tires as

well.

The objective of this project was to benchmark 225/45 R17 94W

passenger car summer tires of different makes against each

other during their mileage with special regards to:

DurabilitySafety on wet and

dry roads


Scope


Durability

Convoy driving over a distance of 30,000 km

(three runs over a 10,000 km distance on public

roads with identical vehicles fitted with the

benchmark tire makes)Tire tread

wear test

NOTE: these “new” tires served as “used”

tires in subsequent tests.


Scope


Safety on wet roads

Subjective assessment of ride and handling criteria and timed laps on

a wetted handling circuit (after 0, 10000, 20000 & 30000 km)

Measurement of the transmittable lateral forces when cornering

through a water basin (after 0 and 30000 km)

Measurement of the aquaplaning speed at 15% slip in a water basin

of 9 mm water depth (after 0, 10000, 20000 & 30000 km)

Measurement of braking distance from 80-20 kph (ABS braking) on:

- wetted asphalt (after 0, 10000, 20000 & 30000 km)

- wetted concrete (after 0 and 30000 km)Braking

Handling

Aquaplaning

in corners

Aquaplaning

longitudinal


Scope


Safety on dry roads

Braking Measurement of braking distance from 100-5 kph (ABS braking) on dry asphalt (after 0 and 30000 km)


Test Population


Summer tires 225/45R17 94W

Manufacturer

Continental

Goodyear

Michelin

Control tire: new Goodyear OptiGrip

OptiGrip

Sport Contact 3

Primacy HP

Commercial name Tread design


Test Vehicles


The wear test was performed with three

test vehicles specified as follows:

VOLKSWAGEN GOLF Mk V 2.0 FSI

Body 5-door saloon

Engine type

Max. Engine power

Max. Speed

4 cyl. 2.0l petrol engine

110 kW / 6000 min-1

206 km/h

Drive concept

Max. Engine torque

Gearbox

Max. Permissible weight

front

200 Nm / 3500 min-1

6-speed manual transmission

1890 kg

VOLKSWAGEN GOLF Mk V 1.9 TDI

Specifications of test vehicle used for

tests on wet and dry surface:

Body

Max. Engine power

Engine type

Max. Speed

Drive concept

Max. Engine torque

Gearbox

Max. Permissible weight

5-door saloon

4 cyl. 1.9l turbo diesel engine, direct injection

77 kW / 4000 min-1

185 km/h

front

250 Nm / 1900 min-1

5-speed manual transmission

1910 kg


Test Details

Wear


Tires fitted to five identical vehicles driven in convoy

over a total distance of 10,000 km :

• Chassis alignment check & adjustments as needed

• Driver / vehicle rotation every 125 km; tire / vehicle rotation

every 500 km to ensure same conditions

• Tread wear measured by digital gauge (1/10 mm accuracy)

• Measurement intervals: every 3,350 km;

6 or 7 (Goodyear) spots in the tire„s 4 main grooves and on each

shoulder measured 5 x on each tire (every 72°)

• Tire inflation pressure checked at each tire / vehicle rotation (every 500 km)

– no air loss noted on any of the test tires throughout the test

Key Points


Test Results

Wear


Expected Lifetime (Average of most worn axle)

100,0%

96,9%

71,6%

55% 60% 65% 70% 75% 80% 85% 90% 95% 100% 105%

after 30000 km Michelin

Continental

Goodyear OptiGrip


Test Details

Performance


General Key Points

• Results of tread wear test (exp. Lifetime) are subject to linear extra-

polation (based on wear between 0 and 30,000 km in the most worn

groove of the average of axle of each brand)

• Relative performance:

performance compared to average performance of all tires in the test

- value above 100 % = better

- value below 100 % = worse

• Results show both absolute values measured and % evaluation

in comparison to the average performance of all tires in the test.


Test Details

Wet Braking


Key Points

• Test vehicle equipped with vehicle speed measurement equipment

• One tire make selected as control tire / re-tested at end of each

complete sequence to consider potential changes of test

conditions (e.g. temperature)

• Deceleration on artificially wetted asphalt and concrete

• Relevant factor for result: stopping distance

• Minimum of 8 validated runs for each tire

• Mean deceleration calculated based on 8 values


Results On

Wet Surface


Braking performance on wet surface, new / used tires (lowµ)

100,0%

100,0%

100,0%

100,0%

100,3%

100,1%

93,5%

95,1%

90,4%

89,3%

85,7%

75,6%

96,4%

95,1%

86,7%

73,0%

65% 70% 75% 80% 85% 90% 95% 100% 105%

new

after 10000 km

after 20000 km

after 30000km

Goodyear OptiGrip

Michelin

Continental

Control tire = new Goodyear OptiGrip

lowµ

Goodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental



Results On

Wet Surface


Braking performance on wet surface, new / used tires (highµ)

100,0%

100,0%

99,7%

96,7%

99,4%

92,6%

100,0%

80,2%

70% 75% 80% 85% 90% 95% 100% 105%

new

after 30000km


Goodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental

highµ


Test Details

Aquaplaning Long.


Key Points

Test vehicle equipped with vehicle speed measuring system and

rotation wheel spin sensors on both front wheels

• Driving: The vehicle is driven with constant speed into a flooded water

basin with an approximate water depth of 9 mm.

One side of the vehicle is running on dry asphalt the other side runs

through the flooded segment.

• Aquaplaning longitudinal: Characterized by maximally reached

aquaplaning speed. Four valid runs in same gear.

• Test: Acceleration with full throttle when entering the water basin.

Speed and wheel spin are recorded. The corresponding vehicle speed

to a wheel spin difference of 15% represents the aquaplaning speed.


Results On

Wet Surface


Aquaplaning longitudinal ability, new / used tires

100,0%

100,0%

100,0%

100,0%

97,5%

97,2%

89,2%

95,7%

93,1%

90,4%

83,6%

96,7%

89,9%

87,0%

79,8%

65% 70% 75% 80% 85% 90% 95% 100% 105%

new

after 10000 km

after 20000 km

after 30000 kmGoodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental


Test Details

Aquaplaning Corn.


Key Points

Test vehicle equipped with vehicle speed measuring

equipment and lateral acceleration sensor

• Driving: Constant speed & steering angle on dry asphalt

(circle with app. 20 m segment flooded water)

• Aquaplaning in corners: Characterized by maximally transmittable

lateral acceleration as well as drop after reaching max (the flatter

the gradient the easier to control)

• Test: Lateral acceleration and speed recorded when vehicle enters

flooded segment (light barrier); vehicle speed is increased run by run

until clear decrease of lateral acceleration occurs


Results On

Wet Surface


Aquaplaning in corners ability, new / used tires

100,0%

100,0%

80,9%

92,3%

69,3%

95,4%

61,7%

50% 60% 70% 80% 90% 100% 110%

new

after 30000 km


Goodyear OptiGrip

Michelin

Continental

Goodyear OptiGrip

Michelin

Continental


Test Details

Wet Handling


Key Points

Subjective assessment of handling & ride by experienced test

drivers on special, artificially wetted handling circuit (asphalt):

• Driving at and beyond vehicle„s stability limit (ESP off / ABS on)

• Avoidance of excessive under- / oversteer while driving at stability

limit (striving for maximum reproducibility)

• Lap times recorded and average speed calculated from lap time

and track length

• Use of 10-point scale for different performance criteria

one overall evalution score


Results On

Wet Surface


Handling ability on wet surface, new / used tires

100,0%

100,0%

100,0%

100,0%

100,3%

99,2%

97,0%

97,2%

96,9%

94,9%

93,0%

90,3%

98,6%

95,0%

89,1%

83,1%

65% 70% 75% 80% 85% 90% 95% 100% 105%

new

after 10000 km

after 20000 km

after 30000 km


Goodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental


Test Details

Dry Braking


Key Points

• Test vehicle equipped with vehicle speed measurement equipment

• One tire make selected as control tire / re-tested at end of each

complete sequence to consider potential changes of test

conditions (e.g. temperature)

• Deceleration on dry asphalt

• Relevant factor for result: stopping distance

• Minimum of 8 validated runs for each tire

• Mean deceleration, calculated based on 8 values


Results On

Dry Surface


Braking performance on dry surface, new / used tires

100,0%

100,0%

98,2%

101,0%

99,0%

102,4%

99,9%

100,1%

95% 100% 105%

new

after 30000 km


Goodyear OptiGrip

Michelin

Continental


Goodyear OptiGrip

Michelin

Continental

Influence Of Mileage On Tire Performances - Goodyear · Goodyear Michelin Control tire: new...

Documents

Transcript of Influence Of Mileage On Tire Performances - Goodyear · Goodyear Michelin Control tire: new...