Tuv sud methodolgy and tests results

TÜV SÜD Automotive Tire Test 2010/2011

Methodology & Test Results 235/35 R19 and 255/35 R19

TÜV SÜD Automotive GmbH

TÜV SÜD – The Corporation


FACTS & FIGURES

Technical service provider

> 16,000 staff on over 600 locations worldwide

Sales volume in 2010: € 1.55 billion

Headquarters: Munich (Germany)

Regions: Western Europe, Central Eastern Europe,

Middle East/Africa, Asia-Pacific and Americas

Over 140 years of business success

Consulting Testing Certification Training

on behalf of industry, trade and commerce, public institutions and private individuals.

TÜV SÜD Automotive – The Company


Services

Consulting

Testing

Homologation

Independent research and development

partner of the automotive industry

• ~ 400 employees

• Competence centers in Europe: Garching,

Filderstadt, Heimsheim and Prague

AREAS OF BUSINESS

Safety

Comfort

Environment

Key Targets

TÜV SÜD Automotive – Tire Testing


BACKGROUND

TÜV SÜD Automotive is performing tire tests for more than 30 years, in indoor and outdoor testing.

Tire tests are done for the purpose of

- development (e.g. new patterns)

- homologation (e.g. ECE R30, ECE R117,…)

- consumer information and marketing (e.g. EC Tire Labeling, Benchmark Tests,… )

A key element especially for tests with the target of development and consumer information is a comprehensive

investigation of the performance of the tire. This concerns all important criteria, such as

- Safety features, especially in emergency situations (e.g. stopping distance)

- Driving experience (e.g. handling, ride & comfort)

- Environment and cost-effectiveness (e.g. rolling resistance & fuel consumption, service life)

A balanced performance, i.e. good to very good achievements in any of the tested criteria is the key factor for a

good global result and customer satisfaction.



BRAKING TESTS

A short braking distance is a highly important feature of active driving safety, on all kinds of road surface.

Legal Backgrounds: Wet: ECE R117 and EC Dir. 222/2009 (Tire Labelling)Dry: No requirements for a minimum performance

Wet Braking Parameters (acc. to ECE R117)

- speed from 80-20 km/h, full ABS braking

- uniform inflation pressure (220 kPa)

- tyre load of 60 - 90% of max. load capacity

Dry Braking Parameters

- from 100-0 km/h, full ABS braking

- inflation pressure acc. to car’s manual



BRAKING TEST

Practical Test Implementation (I)

Before the measuring runs:

- Installation and launch of metrology equipment (e.g. V-Box)

- Marking the braking lane and braking point (e.g. with pylons or

ground markers) to make sure that the same area and traces are

used throughout the test for all tires.

-Do some runs with non-test tires to condition the track and heat up

the brakes of the car.

Before the start:

- for wet braking: Make sure that the surface complies with the requirements of ECE R117, e.g. with a pendulum

tester to measure the friction level and a sand patch application to determine the roughness of the surface.



BRAKING TEST

Practical Test Implementation (II)

Procedure:

- Enter the braking lane with speed approx. 5 km/h higher than the initial speed (e.g. on wet surface, ~ 85 km/h)

- Apply full pedal pressure at the braking point and brake down to standstill

- The metrology system automatically calculates the distance travelled in the chosen speed range (e.g. Wet 80 – 20)

Test Sequence/Repetitions:

If there are e.g. three competitors (T1, T2, T3) in the test, the testing order (with T1 = reference) would be :

T1 (3) → T2 (6) → T3 (6) → T1 (3). For wet braking, a Standard Reference Tests Tire is used.

Evaluation:

The basic evaluation is the comparison of the mean acceleration of the test tires compared to the mean

acceleration of the reference tire (ref tire = 100%).



DRY HANDLING TEST

The performance of the tires has an overriding influence on the driving experience of a car. In a handling test, theinfluence of the tire on the driving feeling and the driving safety (esp. in emergency situations) is assessed.

Legal requirements: There are no legal requirements or uniform test standards for a handling test.

The handling test is normally subdivided into two parts:

Objective part: measurement of lap times on a specially designedhandling circuit.The lap times represent to a certain extent the grip level of a tire in longitudinal (traction/braking) and lateral (cornering) direction.The lap times alone do not allow to draw conclusions on the ride properties, the driving safety and the performance at the limits.

Subjective part: assessment by the test driver of different ride andhandling properties, the driving safety and the performance in emergency situations.



DRY HANDLING TEST

Before the start: Selection of the test vehicle

- sufficient engine power

- representative for the market and the tire range

- tire size to be tested has to be released as OE or retrofitting size

- powerful, reliable and firm brake system

Before the test runs:

- Install the metrology equipment for taking the lap times (optical or radio transmitter near the track, receiver and

display inside the car)

- Some laps are driven with non-test tires to heat up the engine and the brakes and to make the driver familiar to

the track and the conditions (until lap times are constant within <~0.3 sec)



DRY HANDLING TEST

Test Sequence/ Repetitions: Similar as in the braking tests

One tire (part of the test program or not) is chosen to serve as control or reference tire . This tire is run as the first

tire and then repeatedly in the progress of the test in order to be able to detect and correct changes of the ambient

conditions (for lap times) and to recall the “reference state” to the driver (for the subjective assessment).

Criteria for the subjective assessment

The subjective assessment is based on a grading scale with scores from 1 (= worst) to 10 (= best).

The criteria are allocated to different areas of performance:

►Response and Feedback ► Steering angle and Preciseness

► Directional Control, Grip and Balance ► Driving safety and performance at the limits

Evaluation: One subjective global score for the handling performance (made up from individual scores of the 4

areas) & the lap times (converted into an average speed, expressed as percentage).

TÜV SÜD Automotive – Test Framework


TEST DETAILS

SIZES IN TEST:

235/35 R19 91Y (tested in 2010) 255/35 R19 96 Y (tested in 2011)

TIRE RANGE:

Sport/Supersport: UHP tires for sports cars and powerful executive / luxury class cars

TEST CRITERIA (among others):

- Wet Braking - Dry Braking - Dry Handling

COMPETITORS:

- Premium brand tire manufacturers with their recent patterns and in the specifications available in the market

at the time of testing.



DETAILS – WET BRAKING

TEST LOCATION: RDW Test Center Lelystad (NL)

Proving ground of the Dutch Type Approval Authority

Approved wet braking track according to ECE R117

with wet asphalt surface (low µ, BPN >50)

All tests have been carried out at

ground temperatures above 15°C.



DETAILS – DRY TESTS

TEST LOCATION: ATP Papenburg (Germany)

Independent proving ground, linked to Daimler AG.

HANDLING TRACK : Reproduction of small “Hockenheimring”

Track Length: 2600m

The dry braking tests were done at ATP, too.



DETAILS – TEST VEHICLES

Size 235/35 R19

Audi TT 2.0 TFSI (200 hp) Audi S4 Avant (333 hp) (wet braking on normal Audi A4 2.0 TDI)

Size 255/35 R19

TÜV SÜD Automotive – Test Results

BRIDGESTONE

POTENZA S001

CONTI

SPORTCONTACT 5PDUNLOP

SP SPORT MAXX GT

MICHELIN

PILOT SUPER SPORT

PIRELLI

P ZERO

COMPETITORS - 235/35 R19 91 Y (test in 2010)

The competitor tires in

the test have been

purchased by TÜV SÜD

Automotive on the

market from normal tire

dealers and wholesalers.

GOODYEAR

EAGLE F1 ASYM.

DETAILS – TEST TIRES



DETAILS – TEST RESULTS

SIZE 235/35 R19 91 Y

WET BRAKING PERFORMANCE, low µ 80-20 km/h, RELATIVE TO MICHELIN TIRE

The performance of the Michelin

tire represents 100%.

The dotted red line marks the

average performance of all other

competitor tires in this segment

compared to the Michelin.

All values are mathematically

rounded to one decimal digit.

Difference Best /Worst Tire:

~ 5.0 metersØ = 95.0 %




SIZE 235/35 R19 91 Y

DRY BRAKING PERFORMANCE, 100-0 km/h, RELATIVE TO MICHELIN TIRE










~ 2.4 metersØ = 96.3 %




SIZE 235/35 R19 91 Y

DRY HANDLING PERFORMANCE

Grading Scale: 10 = outstanding, 9 = excellent, 8 = very good, 7 = good, 6 = satisfactory,

5 = just acceptable; 4 = unsatisfactory 3 = poor, 2 = very poor; 1 = unacceptableDifference Best /Worst Tire: ~ 2.1 km/h (≈ 1.6 sec)

Ø = 98.6 %

GLOBAL RATING SCORE AVERAGE SPEED [%]


BRIDGESTONE

POTENZA S001

CONTI

SPORTCONTACT 5P (MO)

DUNLOP

SP SPORT MAXX GT (AO)

MICHELIN

PILOT SUPER SPORT

PIRELLI

P ZERO (MO)

COMPETITORS - 255/35 R19 96 Y (test in 2011)

All tires in the test have

been purchased by TÜV

SÜD Automotive on the

market from normal tire

dealers and wholesalers.

GOODYEAR

EAGLE F1 ASYM. 2

DETAILS – TEST TIRES




SIZE 255/35 R19 96 Y

WET BRAKING PERFORMANCE, low µ 80-20 km/h, RELATIVE TO MICHELIN TIRE










~ 2.3 metersØ = 97.7 %




SIZE 255/35 R19 96 Y

DRY BRAKING PERFORMANCE, 100-0 km/h, RELATIVE TO MICHELIN TIRE










~ 1.2 metersØ = 97.3 %




SIZE 255/35 R19 96 Y

DRY HANDLING PERFORMANCE

Grading Scale: 10 = outstanding, 9 = excellent, 8 = very good, 7 = good, 6 = satisfactory,

5 = just acceptable; 4 = unsatisfactory 3 = poor, 2 = very poor; 1 = unacceptableDifference Best /Worst Tire: ~ 1.9 km/h (≈ 1.3 sec )

Ø = 99.0 %

GLOBAL RATING SCORE AVERAGE SPEED [%]

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