2008 AUDI TT ROADSTER Owners Manual

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& W ARNING (continu ed )
crashes and serious personal in jur ies . Have worn or da maged t ires
replaced immediately .
• Tires age even if they are not being u sed and can fail suddenly ,
especially at high speeds. T ires that are more than 6 years old can
only be used in an emergency and then w ith special care and at
low speed.
Glossary of tire and loading terminology
Accessory weight
means the co mbined we ig ht ( in excess o f those sta nda rd items
which may be rep laced) of automatic transmission, power steering,
power brakes, power w indows, powe r seats, rad io, a nd heater, to
the extent that these items are avai lab le as factory-installed equip­
m ent (w hether insta lled or not).
Aspect ratio means t he ratio o f th e height to t he w idt h of the tire in perce nt.
N umbers of 55 or lower indicate a low sidewa ll for improved
steer ing respo nse and b ette r overall ha ndl ing on dry pave ment.
Bead
means the part of the tire that is made of stee l wires, wrapped or
reinforced by ply cords and that is shaped to fit the rim.
Bead separation
means a breakdow n of the bond be tween co mponents i n the bead.
Cord
m eans the strands fo rmi ng the plies in the ti re.
& W ARNING (continued )
• Never mount used tires on your vehicle if you are not sure of
their "previous history. " Old used t ire s may ha ve been damaged
even though the damage cannot be seen that can lead to sudden
tire failure and lo ss of vehicle control.
• If you noti ce unusual vibration or if the vehicle pulls to one side
when driving , always stop as soon as it is safe to do so and check
the wheels and tires for damage . •
Cold tire inflation pressure
mea ns t he ti re pressure reco mm ended by the ve hicle ma nufacturer
for a tire of a designated size that has not been d riven for more tha n
a cou ple o f miles (k ilometers) at low speeds in t he t hre e ho ur per iod
before the tire pressure is measured or ad justed .
Curb weight
means the weight of a moto r vehic le with standard equipment
i nc lud ing the max imu m capac ity o f fue l, o il, and coola nt, a ir c ond i­
tioning and additiona l weight of optional equipment.
Extra load tire
means a tire designed to ope rate at higher loads and at higher infla­
tion pressures than the corresponding standard tire. Extra load tires
my be identified as "XL", "xi", "EX TRA LOAD", or "RF" on the side ­
wa ll.
Gross Axle Weight Rating ("GAWR ")
means the load -carrying capacity of a sing le ax le system, measured
at the ti re -ground interfaces.
Gross Vehicle Weight Rating ("GVWR "l
mea ns the ma ximum tot al l oade d weigh t of the vehicle.
Vehicle care
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Groove
means the space between two adjacent tread ribs.
Load rating (code)
means the maximum load that a tire is rated to carry for a given
inflation pressure . You may not find this information on all tires
because it is not required by law.
Maximum load rating
means the load rating for a tire at the maximum permissible infla­
tion pressure for that tire.
Maximum loaded vehicle weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight, and
(d) Production options weight
Maximum (permissible) inflation pressure
means the maximum cold inflation pressure to which a tire may be
in flated. Also called "maximum inflation pressure ."
Normal occupant weight
means 150 lbs. (68 kilograms) times the number of occupants
seated in the vehicle up to the total seating capacity of your vehicle.
Occupant distribution
means distribution of occupants in a vehicle .
Outer diameter
means the overall diameter of an inflated new tire.
Overall width
means the linear distance between the exteriors of the sidewalls of
an inflated tire, including elevations due to labeling, decorations, or
protective bands or ribs .
Ply
means a layer of rubber -coated parallel cords.
Production options weight
means the combined weight of those installed regular production
options weighing over 5 lbs. (2.3 kg) in excess of those standard
items which they replace, not previously considered in curb weight
or accessory weight, including heavy duty brakes, ride levelers,
heavy duty battery, and special trim.
Radial ply tire
means a pneumatic tire in which the ply cords that extend to the
beads are laid at substantially 90 degrees to the centerline of the
tread.
Recommended inflation pressure
see =:> page 239, "Cold tire inflation pressure".
Reinforced tire
means a tire designed to operate at higher loads and at higher infla­
tion pressures than the corresponding standard tire. Reinforced
tires my be identified as "XL", "xi", "EXTRA LOAD", or "RF" on the
sidewall.
Rim
means a metal support for a tire or a tire and tube assembly upon
which the tire beads are seated .
Rim diameter
means nominal diameter of the bead seat. If you change your wheel
size, you will have to purchase new tires to match the new rim diam ­
eter.
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between rim flanges .

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Sidewa ll
means that portion of a tire between the tread and bead.
Speed ra ting means the speed at which a t ire is designed to be driven for
extended periods of time. The ratings range from 93 mph (150 km/h)
t o 186 mph (298 km/h) =>
page 251. You may not find this informa ­
tion on all tires because it is not required by law.
The speed rating letter code, where applicab le, is molded on the tire
sidewa ll and indicates the maximum perm issible road speeds=>
&
in "Winter tires" on page 254.
T ire pre ssu re m on it o rin g syste m
means a system that detects when one or more of a vehicle's tires
are under inflated and illuminates a low tire pressure warning tell­
tale.
Tre ad
means that portion of a tire that comes into contact with the road .
Tread sepa ra ti on
means pu lling away of the tread from the tire carcass.
Tr ea dw ear indi cato rs ( TW I)
means the projections with in the principal grooves designed to give
a visual indication of the degrees of wear of the tread . See
~ page 248, "Tread Wear Indicator (TWI)" for more information on
measuring tire wear.
U ni form Tire Q ua lity G radin g
is a tire information system developed by the United States National
Highway Traffic Safety Administration (N HTSA) that is designed to
help buyers make re lative comparisons among tires. The UTQG is
not a safety rating and not a guarantee that a tire will last for a
prescribed number of miles or perform in a certain way. It simply
gives tire buyers additiona l information to combine with other
considerations, such as price, brand loya lty and dealer recommen- dations
. Under UTQG, tires are graded by the tire manufacturers in
three areas : treadwear, trac tion and temperature resistance. The
U TQG information on the tires, molded into the sidewalls.
U .S . DOT Tire Identifi cation Number (TIN )
This is the tire's "serial number" It begins with the letters "DOT" and
indicates that the ti re meets a ll federa l standards. The next two
numbers or letters indicate the plant where it was manufactured,
and the last four numbers represent the week a nd year of manufac ­
ture . For example,
DOT ... 2207 ...
means that the tire was produced in the 22t h week of 2007. The
other numbers are marketing codes that may or may not be used by
t he tire manufacturer. This information is used to contact
consumers if a tire defect requires a recall.
Vehi cle cap acity we ight
means the rated cargo and luggage load plus 150 lbs. (68 kilograms)
times the vehicle's tota l seating capacity as l is ted on the label
located on the driver's side B -pi llar.
V eh icle maximum load on the tire
means that load on an individual tire that is determined by distrib ­
uting to each ax le its share of the max imum loaded vehicle weight
and dividing by two.
Ve hic le normal lo ad on the tire
means that load on an individual tire that is determined by distrib ­
uting to each ax le its share of the curb weight, accessory we ight,
and normal occupant weight (distributed in accordance with tab le
below =>
page 242) and dividing by two . ._
Vehicle care I t •

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Occupant loading for vehicle normal load (no luggage)
Designated seating capacity , number of occupants
2
Cold tire inflation pressure
Vehicle normal load (no luggage ), number of occupants
2 •
Tire pressure affects the overall handling, performance and safety of a vehicle.
Fig. 160 Tire pressure
label: located on
driver's side B-pillar
Tire pressure generally refers to the amount of air in a tire that it
needs it to do its job and safely carry the combined load of the entire
vehicle and its contents. Tire pressure is measured in kilopascals
(kPal, the international measuring unit and in pounds per square
inch (PSll. Tire pressure is based in part on the vehicle's design and
load limit -the greatest amount of weight that the vehicle can carry
safely and the tire size . The proper tire pressure is frequently
referred to as the "recommended cold tire inflation pressure." Air in
the tires expands when the tire heats up because of internal friction
when it flexes in use. The tire pressure is higher when the tire has
warmed up than when it is "cold." It is the inflation pressure in a
"co ld" tire that counts. Therefore, you should never let air out of a
warm tire to match "cold tire inflation pressure" recommendations.
The tires would then be underinflated and could fail suddenly.
Main taining proper tire pressure is one of the most important
things you can do to help avoid sudden tire failure. Underinflated
ij
--~--------------- j
.(SEATING CAPAOn':jorAL l :FRONT l '.CENTER I '.REAR I )
The combmedwolghl "'°"'""""ond a,gor.hould ,_ l'>CC TIRE SIZE COLO TIRE PRESS URE
FRO l'rr -KPa, - PSI
REAR -KPa, - PSI
~ A_ R _ E i..===..=;;;..;.;; KP..;;a, :.=;;;;;..;.. PS;;..;.I_
MANUAL FOR
ADDITIONAL
I N FORMATION SEE OWNER'S I
Fig. 161 Tire pressure
label
tires are a major cause of sudden tire failure. Keeping tires at the
right pressure is also important for safe and responsive vehicle
handling, traction, braking and load carrying .
Tire pressures are
particularly important when the vehicle is being driven at higher
speeds, and then especially when heavily loaded even within the
permissible load-carrying capacities approved for your vehicle.
The recommended tire pressures for your Audi depend on the kind
of tires on your vehicle and the number of passengers and/or
amount of luggage you will be transporting.
The tire pressure label located on driver's side B-pillar on your Audi
lists the recommended cold tire inflation pressures for the vehicle
at its maximum capacity weight and tires that were on your vehicle
at the time it was manufactured .
If you wish to improve comfort when operating the vehicle at
normal load (no luggage) up to 2 occupants, you can adjust tire
pressures to those specified for normal vehicle load. Before oper-
i.,.

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ating the vehicle at ma ximum load , you must increase the t ire pre s­
sures to those specified for maximum vehi cle load
~ & .
Bear in mind that the t ire pressure mo nitoring system can only
monitor the tire pressures you have stored . The system does not
reco gnize the load cond itio n of your vehicle.
T he effectiveness of the tire pressure monitoring system will be
impaire d if you stor e nor mal loa d pressures but then operate the
vehic le at its maximum load~&. See the
illustration~ page 242, fig. 160 for the location of the label
on driver's si de B -pillar (co lor of the ac tual label a nd exact loca tion
on the veh ic le will vary slightly).
N ote that the following tab le is accu rate at the time of going to
press and is subject to cha nge . In t he event o f discrepancies, the t ire
pressure label (on driver's side B -pillar) a lways takes precedence .
The table belo w lists t he r ecom mend ed cold tire i nflatio n pressures
for the Audi mode l covered by your Owner's Literature at the
vehic le' s capacity weigh t and the tire size s insta lled o n the respec ­
tive models as original equipment , or as a factory option .
Engine Tire designation
Tire pressure front II Tire pressure rear
(displace -
= " full load full load
ment in normal load
condition normal
load
condition
liter ) condition
(up to condition (up
( 2 oc cupants (2 occupants
2 o ccupants ) to 2 occupants)
plus luggage) plus luggage)
I
PSI II kPA PSI II kPA II PSI II kPA
PSI I[ kPA I
I
4-cylinder
225/50 R17 94H All Season 32 220 3 2 220 29 200 29 200
2.0
245/40 R18 93H All Season 32 220 32 220 29 200 29 200
245 /40 R18 93Y XL High Performance 32 220 32 220 29 200 29 200
255 /35 R19 95Y XL High Performance 32 220 32 220 29 200 29 200
6 -cylinder 245/45 R17 95H All Season 3 2 220 32 2 20 29 200 29 2 00
3.2
245/40 R18 93H All Season 32 220 32 220 29 200 29 200
245 /40 R18 93V XL High Performance 32 220 3 2 220 29 200 29 200
255/35 R19 95V XL High Performance 32 2 20 32 220 29 200 29 200
XL = reinforced
T he correct tire pressure for the spare wheel is located on a label on the tire p ressure label on your vehicle with the tires on your vehic le.
t he d river's s ide B -pilla r. Make sure that the tire s ize inf ormat ion on t he veh icle labe l is t he
Because technical changes may be made to vehicle equipment same as the si
ze of the tires on the vehicle. This is especially impor -
t ant if the ve hicle belongs to so meo ne else or you bought the
dur ing th e mode l year, always co mpare the tire size designa tion on
Vehicle care
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vehicle with different rims/tires or you bought the vehicle as a previ­
ously owned vehicle.
Remember, your safety and that of your passengers also depends
on making sure that load limits are not exceeded. Vehicle load
includes everybody and everything in and on the vehicle. These load
limits are technically referred to as the vehicle's Gross Vehicle
Weight Rating ("GVWR"). The Gross Axle Weight Rating ("GAWR") is
the maximum load that can be applied at each of the vehicle's two
axles. The Gross Vehicle Weight Rating and the Gross Axle Weight
Rating are listed on the safety compliance sticker label located on
the driver's side 8-pillar. The tire pressure label on your Audi lists
the maximum combined weight of all of the occupants and luggage or other cargo that the vehicle can carry. For the location of the tire
pressure label =>
page 242, fig. 160.
& WARNING
Overloading a vehicle can cause loss of vehicle control, a crash or
other accident, serious personal injury, and even death.
• Carrying more weight than your vehicle was designed to carry
will prevent the vehicle from handling properly and increase the risk of a loss of vehicle control.
• The brakes on a vehicle that has been overloaded may not be
able to stop the vehicle within a safe distance.
• Tires on a vehicle that has been overloaded can fail suddenly
causing loss of control and a crash.
& WARNING
• Incorrect tire pressures and/or underinflation can lead to a
serious or fatal accident.
• Incorrect tire pressures and/or underinflation cause increased
tire wear and can affect the handling of the vehicle.
& WARNING (continued)
• Incorrect tire pressures and/or underinflation can also lead to
sudden tire failure, including a blowout and sudden deflation,
causing loss of vehicle control . •
Checking tire pressure
The correct tire pressure for the tires originally installed
on your vehicle is listed on the tire pressure label located
on driver's side 8-pillar.
The recommended tire pressures are on the tire pressure label and
in the table=>
page 242, "Cold tire inflation pressure". This means
that the pressure must be checked and adjusted when the tire has
not been driven for more than a couple of miles (kilometers) at low
speeds during the previous three hours. Air in the tires expands
when the tire heats up as a result of internal friction as it flexes in
use. The tire pressure is higher when the tire has warmed up than
when it is "cold."
It is the inflation pressure in a "cold" tire that counts. Therefore, you
should never let air out of a warm tire to match "Cold tire inflation
pressure" recommendations=>
page 242. The tires would then be
underinflated and could fail suddenly.
The tire pressure label on your Audi lists the recommended cold tire
inflation pressures for the new, original equipment tires that were
on your vehicle at the time it was manufactured . For the location of
the label
=> page 242, fig . 160.
Most tires lose air naturally over time. They can also lose some air if
you drive over a pothole or hit a curb while parking . It is usually not
possible to see whether the radial tires used today are underinflated
just by looking at them .
Therefore, be sure to check tire pressures at least once a month and
always before going on a long trip. Make sure to take the number of
people and the amount of luggage into account when adjusting tire .,_

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pressure for a trip - even one that you would not consider to be
"long." See=>
page 246, "Tires and vehicle load limits" for more
important information .
Always use an accurate tire pressure gauge when checking and adjus ting inflation pressures . Check all of the tires and be sure not
to forget the spare tire . If the pressure in any tire is too high when
the tire is "cold," let air out of the tire slowly with the edge of the tire gaug e and keep checking the pressur e until you reach the pressure
that is correct for the load (passengers and luggage) and kind of driving you plan to do.
I f the pressure in any tire is too low, note the difference between the
pressure in the cold tire and the pressure you need and add the air
that you need to reach the correct pressure for the vehicle load
(passengers and luggage) for the tires on your vehicle as listed on
the on your vehicle and in this manual and the kind of driving you
plan to do.
Ne ver e xceed the m aximum inflat ion pre ssure l isted on the tire
sid ewall for any rea son .
Remember that the veh ic le manufacturer, not the tire manufacturer ,
determin es the correct tire pressure for the tires on your vehicle .
It is important to check the tire pressure when the tires are cold .
• Read the required tire pressure from the tire pressure label
located on driver 's side 8 -pillar.
• T urn the va lve stem cap counter -clockwise to remove it from the
tire valve .
• Place the air pressure gauge on the valve .
• The tire pressures should only be checked and adjusted when
the tires are cold. The s lightly raised pressures of warm tir es mus t
not be reduced.
• Adjust the tire pressure to the load you are carrying .
• Reinstall the va lve stem cap on the valve .
When should I ch eck the tir e pr essu re?
The correct tire pressure is especially important a t high speeds . The
pressure should therefore be checked a t least once a month and
a lways before sta rting a journey.
Wh en sho uld I adjust the tire p re ss ure s?
Adjust the tire pressure to the load yo u are carrying . After changing
a wheel
o r replacing wheels you have to adjust the tire pressures on
a ll whee ls . In addition, you must then initia lize the new tire pres ­
sures in the tire pressure monitoring system=>
page 41.
& WARNING
Incorre ct t ir e pre ssures and /or underinfl ati on ca n lead sudden tire
failure , los s of contro l, colli sion , seriou s per sonal injury or even
death .
• Whe n the w arnin g sy mbol appear s in the instrument
cl uster , sto p and in spe ct the tire s.
• Inco rre ct tire pre ssure and /or underin flati on can cau se
in creased tire wear and can affe ct the ha ndling of the vehicle and
s topping ability.
• Incorre ct t ire pre ssures and /or underinfl atio n c an a ls o le ad to
s udden tire f ailure , including a blowout and sudden deflation ,
ca usi ng loss o f vehi cle co ntrol.
• The driv er i s re sp o nsible for the correct tire p re ss ure s for all
tire s on the vehicle . T he appl icable pre ssure v alu es are lo ca ted o n
a stic ker on th e driver 's side B -pillar.
• Onl y w hen all tire s on th e veh icle a re fi lled to the corre ct pre s­
s ure , the tire pre ssure monitor ing sy ste m can work correctly .
• The u se of incorre ct t ire pr essure val ues can lead to accidents
or other d am age. The refo re it is esse ntial th at the dri ver ob serve
the spe cified tire pr essur e value s fo r the t ire s and the correc t pr es­
s ures for the function of the tire pr essure monitoring sy stem.
• Always inflate t ires to the r ecom mended and corre ct tir e pr es -
su re bef ore dri ving off.
~
Vehicle care I t •

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& WARN ING (continued )
• Driving with underinflated tires bend more , letting them get
too hot re sulting in t read separation , sudden t ire failure and loss
of control.
• Excessive speed and /overloading can cau se heat bu ild-up ,
sudden tire failure and lo ss of control.
• If the tire pressure is too low or too high , the tires will wear
prematurely and the vehicle will not handle well .
• If the tire is not flat and you do not have to change a wheel
immediately, drive at reduced speed to the nearest service station
to che ck the tire pres sure and add air as required .
0 Note
Driving without valve stem caps can cause damage to the tire
va lves. To prevent this, always ma ke sure that fact ory insta lled valve
stem caps on all whee ls are securely mounted on the valve .
<£> For the sake of the environment
Underinflated tires will also increase the fue l consumption. •
Tires and vehicle load limits
There are limits to the amount of load or weight that any vehicle and
any tire can carry. A vehicle that is overloaded will not handle well
and is more difficu lt to stop. Overload ing can not only lead to loss
of vehicle contro l, but can a lso damage important parts of the
veh ic le an d ca n lead to sudden t ire fa ilu re , inc lud ing a bl owout a nd
sudden deflation that can cause the vehicle to crash.
Yo ur saf ety a nd that of you r passenge rs also de pends on making
sure that load limits are not exceeded . Vehicle load includes every ­
body and eve ryt hing in and on the vehic le . Th ese load limi ts are technica
lly referred to as the vehicle's
Gross Vehicle We ight Rating
("GVWR").
Th e "GVWR" includes the weight of the basic vehicle, all factory
insta lled accessories, a ful l tank of fuel, oil, coolant and other f luids
p lus max imum load. The ma ximu m load inc ludes the numbe r of
passengers that the vehicle is intended to carry ("seating capacity")
w it h an assu med we ight o f 150 lbs (68 kg) for eac h pass enger at a
designated seating position and the total weight of any luggage in
t he vehicle.
T he
Gross Axle Weight Rating ("GAWR"l is the maximum load that
can be a pplied a t eac h of the vehic le's two a xles .
T he Gross Veh icle Weigh t Rat ing a nd the Gross A xle We igh t R ating
are listed on the safety comp liance stic ker label located on the
dr iver's s ide B -p illar . You r Aud i has 2 sea ting pos it io n s. Eac h seating
posit ion has a safety belt=>
page 137, "Safety belts".
T he fact that the re is a n up per lim it to yo ur vehicle's G ross Veh ic le
We ig ht Rating means that the to tal we ight o f what ev e r is be ing
ca rried in the ve hicle is lim ited. The mo re pas se ngers in the vehic le
or passe ngers w ho ar e heav ier t han th e sta ndard weights assumed
mean that less weight can be carried as luggage.
T he ti re p ress ure labe l on yo ur Aud i al so list s the maxi mum
combined weight of a ll of the occupants and luggage or other cargo
th at the vehicle can car ry. F or the lo ca tio n of t he label =>
page 242,
fig . 160.
& WARNING
Overloading a vehicle can cause loss of vehicle control , a crash or
other accident, serious personal injury , and even death .
• Carrying more weight than your vehicle was des igned to carry
will prevent the vehicle from handling properly and increase the risk of the loss of vehi cle control .
• The brakes on a vehicle that has been overloaded may not be
able to stop the vehicle within a safe distance. .,_