2009 AUDI TT COUPE wheel torque

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Electronic differential lock (EOL)
The electronic differential lock monitors the rotational
speed of the drive wheels.
General notes
The electronic differential lock (EDU helps the car to start moving,
accelerate and climb a gradient on surfaces providing poor or
almost no grip. Without EDL, this would be difficult, if not impos ­
sible.
How the system works
Th e EDL operates automatically. It monitors the rotational speed of
the drive wheels on an axle with the help of the ABS sensors
=> page 187. If a noticeable difference in rotational speed between
the drive wheels on one axle is detected (e.g. on slippery ground on
one side), the spinning wheel is braked, thereby transferring power
to the other drive wheel or wheels (all-wheel drivel. This is done up
to a speed of about 60 mph (100 km/hl. Noises from the brake
system signal that wheel spin is being controlled.
Driving off
When driving off, always be sure to keep road conditions in mind as
you accelerate . If one drive wheel spins because it is on a surface
with less grip, gradually increase the pressure on the accelerator
pedal until the car starts to move. The wheel less able to transfer
power spins.
Overheating of brakes
To prevent the disc brake of the braked wheel from overheating if
subjected to excessive loads, the EDL cuts out temporarily . The
vehicle remains operational and behaves in the same way as a
vehicle without EDL.
As soon as the brake has cooled down, EDL switches on again auto­
matically.
& WARNING
• When accelerating on slippery surfaces, such as on ice or snow,
always be careful when depressing the accelerator pedal. Even
with the EDL working, the drive wheels can spin and reduce your ability to control your car. -Risk of crash!
• The increased safety afforded by EDL does not mean that you
can take safety risks. Always adapt your driving style to the road
conditions and traffic situation.
[ i] Tips
If a fault occurs in the ABS, the EDL is also not functioning . This is
indicated by the ABS warning light=> page 20. •
Anti-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the driven
wheels from spinning when the car is accelerating.
General notes
The Anti-Slip Regulation System (ASR) is integrated in the electronic
stabilization program (ESP). When the vehicle starts up and acceler ­
ates , the wheels are prevented from spinning by adjusting the
engine power to match the amount of grip available from the road
surface .
How the system works
ASR performs automatically, i.e. without the driver's intervention .
With the aid of the ABS sensors => page
187, ASR monitors the
speed of the driven wheels. If the wheels start to spin, the engine
torque is reduced automatically until the tires find enough grip to
lock onto the road surface . The system is active across the entire
speed range.
The ASR works in conjunction with the ABS. If a malfunction should
occur in the ABS, the ASR will also be out of action .
~

-Tires and wheels
P'tr:1-------------------
Remove wheel center covers and trim discs befor e putting snow
ch ain s on y our ve hic le ~
(D. For sa fe ty rea sons c over ca ps m us t
th en be fitted over the wheel bo lts. These ar e avai lable from autho ­
rized Audi deale rs.
& WARNING
Using the wrong snow chains for your vehicle or installing them
incorrectly can increase the risk of loss of control leading to
serious personal injury.
• Snow chains are available in different sizes . Always make sure
to follow the instructions provided by the snow chain manufac ­
turer .
• When driving with snow chains never drive faster than the
speed permitted for your spec ific snow chains.
• Always observe local regulations.
0 Note
• Remove s now c hains befo re driv ing on roads no t cove re d w it h
snow to avoid damag ing tires and wearing the snow chains down
un nece ss aril y.
• Snow chains, whic h come into direct contact with the wheel rim,
can scratch or da mag e it. There fo re , m ake sure t hat th e s now ch ai ns
a re s uitably covered. Check the position of the snow chains after
dr ivin g a few yar ds a nd correct if ne cessary . Fo ll ow the in struc tions
from t he snow cha in manufacturer when do ing so.
[ i ] Tips
Where snow chains are mandatory on certain roads, this normal ly
a ls o ap plies to vehicle s w ith All W hee l Dr ive.•
Wheel bolts
W heel bo lts mu st a lways be ti ghte ned to t he corr ect
t o rq ue .
The design of wheel bolts is matched to the facto ry instal led rims . If
diff eren t rim s are fitt ed, t he cor rect w heel bol ts with the r ig ht le ngth
and correctly shaped bolt heads must be used. This ensures that
w hee ls a re fitted securely and t hat t he brake sys te m funct io ns
correctly.
In cer tain ci rc u ms tances, yo u may no t use whee l b olt s fro m a
different vehicle -even if it is the same model~
page 295.
& WARNING
Improperly tightened or maintained wheel bolts can become loose
causing loss of control, a collision and serious personal injury .
• Always keep the wheel bolts and the threads in the wheel hubs
clean so the wheel bolts can turn easily and be properly tightened .
• Never grease or oil the wheel bolts and the threads in the wheel
hubs. They can become loose while driving if greased or oiled,
even if tightened to the specified torque.
• Only use wheel bolts that belong to the rim be ing installed.
• Never use different wheels bolts on your vehicle.
• Always maintain the correct tightening torque for the wheel
bolts to reduce the risk of a wheel loss .
If the tightening torque of
the wheel bolts is too low , they can loosen and come out when the
vehicle is moving. If the tightening torque is too high, the wheel
bolts and threads can be damaged and the wheel can become
loose .
0 Note
The specified torq ue for the wheel bolts is 9 0 ft lb (120 Nm) with a
t o lerance of± 7,4 f t lb (± 10 N m). To rque w hee l bo lt s d ia g ona lly .
After chang ing a wheel, the torque must be checked as soon as
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Loosening and tightening the wheel bolts
The wheel bolts must be loosened before raising the
vehicle.
Loosening
Fig . 163 Wheel
change: loosening the
wheel bolts
- Fit the wheel bolt wrench over the wheel bolt and push it
down as far as it will go .
- Close your grip around the
end of the wrench handle for
maximum torque and turn the wheel bolts
counter-clock­
wise
about one single turn in the direction of arrow
~ fig. 163.
Tightening
Fit the wheel bolt wrench over the wheel bolt and push it
down as far as it will go.
- Close your grip around the
end of the wrench handle for
maximum torque and turn each wheel bolt
clockwise
until it sits tight.
& WARNING
• Using force without control to speed the wheel change up can
cause the vehicle to slip off the jack and cause serious personal
injuries.
• Do not loosen the wheel bolts more than one turn before you
raise the vehicle with the jack. -Risk of injury!
[ i] Tips
• Never try and use the hexagonal socket in the handle of the
screwdriver to loosen or tighten the wheel bolts.
• If a wheel bolt sits very tight, you may find it easier to loosen by
carefully pushing down on the end of the wheel bolt wrench with
one foot only . As you do, hold on to the car to keep yourself stable
and take care not to slip.•
Raising the vehicle
The vehicle must be lifted with the jack first before the
wheel can be removed.
Fig. 164 Wheel
change: mounting
points
for the lifting
jack ..

What do I do now? -
----------------
•
• The whe el bo lts should be cl ean and easy to turn . C heck for dirt
an d corro sion on the mati ng s urfaces o f both th e wheel a nd the
hub. Remove a ll dirt fro m these surfaces before remountin g the
whee l.•
Notes on wheel change
Ple as e rea d th e informati on => pag e 246 , "New tir es an d r ep laci ng
tir es and whee ls", if you ar e goin g to us e a spar e tire which is
d ifferent from th e tir es on y our v ehic le .
After you ch ange a tire :
• Check the tire pressure on the spare immediately after
mounting.
• Have the wheel bolt tightening torque checked with a torque
wrench as soon as possible by your authorized Audi dealer or a qualified service station .
• With steel and alloy wheel rims, the wheel bolts are correctly
tightened at a torque of 90 ft lb (120 Nm l.
• If you notice while changing a tire that the wheel bolts are
corroded and difficult to turn , then they should be replaced before
you check the tightening torque.
• Replace the flat tire with a new one and have it installed on your
vehicle as soon as possible . Remount the wheel cover.
Until then , drive with extra care and at reduced speeds .
& WARNING
• If you are going to equip your vehicle with tires or rims which
differ from those which were factory installed , then be sure to read
the information
=> page 246, "New tires and replacing tires and
wheels ".
• Always store the tools securely in luggage compartment .
Otherwise, in an accident or sudden maneuver they could fly
forward, causing injury to passengers in the vehicle.
0 Note
D o not us e comme rc ia lly av ai labl e tire sea lants. Otherw ise, t he elec ­
trical components of the ti re pressure monitor ing system* will no
l o nger wor k properly a nd the se ns or fo r the tire pr essure moni­
to ring system will have to be rep laced b y a qualified workshop. •
Tires with unidirectional tread design
T ires w ith unid ire ction al tread design must be m ounted
w ith their tread patte rn po inted t he r ight dire ction.
A un id irectiona l tir e ca n be iden tified by arrows on the sidewall ,
w hi ch point in th e dir ec tion of the r otation. You mus t follow th e
specified direction of rotati on. T his is necessa ry in o rder fo r these
t ire s to de ve lop their optimum ch arac ter ist ics rega rdin g grip, r oad
noise, wear, and h ydroplaning .•
Do-it -yourself service

Alphab eti ca l ind ex -
-------------=----
What should I do after replacing wheels?
242
Wheel bolts Torque .. ... ... .. .... .... ....... . 252
Wheels . .... .... .... .... ... .... .... 234
Cast al loy ....... .... .... ....... . 204
Checking tire pressure . ...... .... . 241
Co ld tire inflation pressure ... .. .. .. 238
Genera l notes .................... 234
G lossary of tire and loading termino logy
235
New tires and wheels . ....... .... . 246
T ires and vehicle load limits .... .... 242
Wheelsffires Stee l wheels ...... .... ... .... .... 203 Winter operation
Battery ... .... ...... ...... .... ... 228
Coolant system .................. 224
Defrosting windows ............... 88
Hea ted seats (climate control) .. .... . 90
Tires ....... .. .... .... .... .... ... 189
Win dows ..... ... .... .... .... .... 202
Winter tires .... .... ... .... .. ....... 2 50
All -whee l drive ...... ...... .... ... 250
Wiper and washer system . ...... .... .. 60
I ntermittent wiping . ...... .... .... . 60
One -tap wiping .... ........ ....... . 60
Wiper blades Insta lling new wiper b lades .. ...... . 63
When must the airbag system be inspected?
X
146
When should I adjust the tire pressures? . . . Xeno n-Ligh ts . ...... .... .... .... .... 278
242
When sh ould I check the tire pressures? 242
Where can I find the tire pressures for my car? ... ... .. .... .... ... .. .. .... 241
Why sa fety belts? ... ........ .... 125, 126
Windows Cleaning .. ... .... .... ... .... .... 202
Convenience close/open feature ..... 49
Defrost ........ ............... ... 88
Windshield washer fluid ...... .... .... . 36
Windshield wipers Instal ling new wipe r blades . ...... .. 63
Service p osition ...... .... ... .... .. 62
Washer fluid reservoir .. ...... .... . 233
Controls and equip­
ment Safety first Vehicle operation
Vehicle care Do-it-yourself service Technical data