2009 AUDI S8 inflation pressure

-Select System s in the CAR menu .
- Selec t
Instrument cluster .
-Select Trip computer 1 or Trip computer 2 .
-Select, for examp le, Fuel range On to turn on the display
or
Off to turn the disp lay off.
All values in the single -trip or the total -trip memory can be reset to
zero simultaneously in MMI. In addition you can determine what
driving information from the trip computer should be shown in the
instrument cluster display. If one of the pieces of driver information
is turned off, that driver information will not be shown in the display .
The information will continue to be calcu lated by the trip computer
and can be turned back
on at any time. •
Tire pressure monitoring system
Applies t o vehi cle s: with n re pre ss ure moni toring sys te m
General notes I)
Each tire, including the spare (if provided}, should be checked
month ly when cold and inflated to the inflation pressure recom­
mended by the vehicle manufacturer on the vehicle placard or tire
inflation pressure label. (If your vehicle has tires of a different size
than the size indicated on the vehicle placard or tire inflation pres ­
sure label, you should determine the proper tire inflation pressure
for those tires.}
As an added safety feature, your vehicle has been equipped with a
tire pressure monitoring system (TPMSl that illuminates a low tire pressure tellta le when one or more of your tires is significantly
under-inflated . Accordingly, when the low tire pressure te lltale i llu ­
minates, you should stop and check your tires as soon as possible,
and inflate them to the proper pressure. Driving on a significantly
under -inflated tire causes the tire to overheat and can lead to tire
Controls and equip ­
ment
Dr ive r informat ion di spl ay
failure . Under -inflation also reduces fuel efficiency and tire tread
life, and may affect the vehicle's handling and s topping ability.
Please note that the TPMS is not a substitute for proper tire mainte ­
nance, and it is the driver 's responsibility to maintain correct tire
pressure, even if under-inflation has not reached the leve l to trigger
illumination of the TPMS low tire pressure te lltale.
Your vehic le has a lso been equipped with a TPMS malfunction indi­
cator to indicate when the system is not operating proper ly. The
TPMS ma lfunction indicator is combined w ith the low ti re p ressure
tel ltale . When the system detects a malfunction , the telltale wil l
flash for approximately one minute and then remain continuously
il luminated . This sequence will cont inue upon subsequent vehicle
start -ups as long as the malfunction exists.
When the ma lfunction indicator is illuminated, the system may not
be able to detect or signal low tire pressure as intended . TPMS
mal functions may occur for a variety of reasons, including the
insta llation of replacement or alternate tires or wheels on the
vehic le that prevent the TPMS from funct ioning properly. A lways
check the TPMS malfunction tellta le after replacing one or more
tires or whee ls on your vehicle to ensure that the replacement or
alternate tires and wheels allow the TPMS to continue to function
properly. •
Applies t o vehic les : w ith Tire press ure mon itoring sy stem
Introduction
The tire pressure monitoring system moni tors air pressure
in all four roa d wheels and the spare tire* while the
vehicle is moving.
As soon as the tire pressure monitoring system senses a significant loss of air pressure in one o r severa l tires, text messages and yellow
symbo ls appear in the instrument cluster display to alert the driver.
The L warni ng light in the instrument cluster comes on when the
tire is significantly underinflated
=> page 20. _,,
I • •

Driver inf ormati on displ ay
The warning light n also illuminates in the case of a system
mal fu n ction.
The system continuously receives radio signals from sensors located inside each tire .
Be aware that tire pressure is also dependent on the temperature of
the tire. For every 18 °F (10 °C) increase in tire temperature, tire pres­
sure increases by about
1 .5 psi (0.1 bar). The tire warms up while the
vehic le is moving and tire pressure rises. So you should adjust tire
pressure only when the tires are
cold, when the temperature of the
tires is roughly the same as the ambient air temperature .
In order to keep the tire pressure monitoring system properly cali ­
brated, tire pressure on al l four tires and on the spare tire * should
be checked at regular intervals, adjusted if necessary and sav ed in
the proper setting (recommended pressure) =>
page 44.
The tire pressure is shown on the tire pressure label. On USA vehi­
cles, the tire pressure label is located on the driver's side B -pi llar. On
Canada vehicles, the tire pressure labe l is located either on the
driver's side B -pil lar or inside the fuel filler flap . The tire pressu re
label lists the recommended cold t ire inflat ion pressures for the
vehic le at its maximum capacity weight and the tires that were on
your vehicle at the time it was manufactured . For recommended tire
pressures for normal load conditions, please see chapter
=>
page 330 .
The current temperatures and pressure of your tires can be viewed
i n the MMI =>
page 44.
& WARNING
• When the t ire pre ssure moni toring sy st em warning light i s lit ,
one or more of your tir es is s ignifi cantly under -infl ate d . Y ou s hould
s to p and che ck your tir es as soon as poss ible, and infl ate th em to
th e p rop er p ress ure as i ndicated on the vehicle's tire press ure
lab el
=> page 3 30 . Driving on a s ig n ific antly und er-inflated tir e
ca uses the t ire to overheat an d ca n le a d t o tir e fai lur e. U nde r- infl a-
& W ARN IN G (c ontinued )
tion a lso is likel y to imp air t he veh icle 's handling and sto pping
ability .
• Do not adju st t ire press ure when t ire temper atu re i s excessiv e.
T hi s c ould le ad to seriou s tire dam age and even cause the ti re to
bur st, w ith the additional d ange r of an accident .
Driving with under -inflated tires reduces fuel efficiency and tire
tread life.
[ i ] Tips
• Each tire, includin g the sp are*, should be checked monthly when
cold and set to the recommended inflation pressure as specified on
the tire pressure label=>
page 330.
• T he tire pressure monitoring system he lps the d river to keep an
eye on tire pressures . But the dr iver st ill has the responsibility for
maintaining the correct tire pressure .
• Tire pressure must only be adjusted when the temperature of the
tires is about the same as ambient air temperature.
• When tires are replaced, the sensors and valves shou ld not be
detached or exchanged . Only the valve core needs to be replaced
and, if necessary, the va lve and the wheel electronics replaced .
• If you should put different whee ls and tires on your vehicle (e.g .
winter wheels and tires), you must be certain that the wheels and
tires are compatible with the tire pressure monitoring system. Otherwise the system will register a ma lfunction and a fault
message will be displayed. For more information , contact your
authorized Audi dea ler.
• Adjust the tire pressure and store the pressure in the tire pres ­
sure mon itor ing system to the load you are carrying=>
page 330.
• For Declaration of Compliance to United States FCC and Industry
Canada regulations =>
page 385. •

-Adjust air pressure as needed in acco rdance with the
informat io n on the label located either on the driver's
side B -pillar (visible w hen the door is open), inside the
fuel filler flap and addi tionally in t he manua l.
Saving tir e pres sur es
- Tur n on the ignition.
- Press the
I CAR I funct ion button.
- Select
Systems in the CAR menu .
Selec t
Tire p ressure monitoring.
-Select Store curr. tire pres sures :::} page 44, fig. 27 .
All pressure warning indicators in the display will be canceled .
Following each intentional change in specified pressures, tire pres ­
sures must be resaved .
After the pressures are saved, the tire pressure monitoring system measures the current tire pressures and saves them as the new
specified pressures.
[ i ] Tip s
• T he t ire pressure is shown on the tire pressure label. On USA
vehic les, the tire pressure label is located on the driver's side 8 -
pillar. On Canada vehicles , the tire pressure labe l is located e ither on
the driver's side 8 -pillar or inside the fuel filler flap. The tire pressure
label lists the recommended cold tire inflation pressures for the
vehicle at its maximum capacity weight and the tires that were on
your vehicle at the time it was manufactured . For recommended tire
pressures for normal load conditions, please see chapter
=> page 330 .
• The tire pressure mon itoring system he lps the driver to keep an
eye on tire pressures. But the driver still has the responsibility for
maintaining the correct tire pressure.
Controls and equip ­
ment
Dr ive r informat ion di spl ay
• I f your vehic le is equipped with a standard spare tire *, it must be
inflated to the maximum pressure specified for the veh icle. •
Applie s to veh ic le s : with T ire pressur e mo nitoring sys tem
Changing a wheel
When you change a wheel, the new tire must be initial ­
ized.
- Turn on the ignition .
Press the
I CAR] function button.
Select
Systems in the CAR menu.
- Selec t
Tire pre ssure monitoring .
Select Initialize wh eel s:::} page 44, fig. 27.
Programming is necessary:
• After the tires have been rotated on the vehicle (inc luding use of
the spare tire*),
• I f tires with new wheel sensors are used.
A ll pressure warning and system ma lfunction indicators in the
display will be canceled.
I f a wheel change has been made, it is necessary to complete the
Initi aliz e w heel s function.
The tire pressure monitoring system is not available during the programming process and no pressure and temperature values are
displayed on the MMI display.
After you have selected the function, the new whee ls are
programmed and the actual pressures are stored. This learning
phase can take up to 20 minutes driving time. •
I • •

________________________________________________ T_ i _r_e _s_ a_n_ d_ w_ h_ e_e _ l_s __ ,n
•
& 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 des ign to operate at higher loads and at highe r infla ­
tion pressures than the corresponding standard tire. Extra load tires
may be identified as "XL", "xi", "EXTRA 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
I t •

-~_T_ ir_e_ s_ a_ n_d _ w_ h_ e_e _l_s _________________________________________________ _
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, roof rack, 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 327, "Cold tire inflation pressure".
Reinforced tire
means a tire design to operate at higher loads and at higher infla­
tion pressures than the corresponding standard tire. Reinforced
tires may 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 .

___ T_ i_ r_e _s_ a_ n_ d_ w_ h_ e_ e _ ls _________________________________________________ _
Occupant loading and distribution for vehicle normal load for various designated seating capacities
Designated seating capacity , num­
ber of occupants
4
5
Cold tire inflation pressure
Vehicle no rmal load, number of
oc cupants
2
3
Occupant distribution in a normally
loaded vehicl e
2 in front
2 in front, 1 in b ack sea t
Tire pressure affects the overall handling, performance and safety of a vehicle.
Fig. 274 Tire pressure
label: located either on
driver 's side B-pillar or
inside the fuel filler flap
T IRE AND LOADING INFORMATION
T IRE SIZE COLD TIRE PRESS URE
FR ONT -KPa, - PSI
REAR -KPa, - PSI
I.:: SPARE -KPa, -PSI Fig . 275 Tire pressure
label
Maintaining proper tire pressure is one of the most important
things you can do to help avoid sudden tire failure. Underinflated
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.
•
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
(kPa), the international measuring unit and in pounds per square
inch (PSI). 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
"cold" 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. On
USA vehicles, the tire pressure label is located on the driver's
side 8-pillar . On Canada vehicles, the tire pressure label is located
either on the driver's side 8 -pillar or inside the fuel filler flap . The tire
i.,.

Tires and wheels -________________ w-.
•
pressure label 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 (up to 3 occupants), you can adjust tire pressures to
those specified for normal vehicle load. Before operating the vehicle
at maximum load , you must increase the tire pressures to those
specified for maximum vehicle load
=> &.
Bear in mind that the tire pressure monitoring system* can only
monitor the tire pressures you have stored. The system does not
recognize the load condition of your vehicle .
The effec tiveness of the tire pressure mon itoring system* will be
impaired if you store normal load pressures but then operate the
vehicle at its maximum load=>&. See the
illustration=>
page 330, fig. 274 for the location of the label
either o n driver's side 8-pillar or inside the fuel filler flap (color of
the actual label and exact location on the vehicle will vary slight ly).
Note that the following tab le is accurate at the time of going to
press and is subject to change. In the event of discrepancies, the t ire
pressure label (On USA vehicles, the tire pressure label is located on
the driver's side 8-pillar. On Canada vehicles, the tire pressure label
is located either on the driver 's side 8-pillar or inside the fuel fil ler
flap) always takes precedence.
The table below lists the recommended cold tire inflation pressures
for the Audi mode l covered by your Owner's Literature at the
vehicle's capacity weight and the tire sizes installed on the respec­
tive models as original equipment, or as a factory option.
Engine
(displace­
ment in
liter) Tire designation
Tire pressure front Tire pressure rear
8-cylinder
4.2
8-cylinder
4 .2 L 255/45 R18 99H All Season
255/40 R19100V
XL All Season
255/40 R19
1 00Y XL High Performance
275/35 R20 102Y XL High Performance
255/45 R18 99H All Season
255/40 R19 100V XL All Season
255/40 R19 1 00Y XL High Performance
275/35 R20 102Y XL High Performance
normal load conditional
kPA
33 230
36 250
33 230
38 260 33 230
36 250
33 230
38 260
full load
condit ion
PSI
33 230
38 260
33 230
41 280
35 240
38 260
35 240
41 280
Vehicle care
normal load full load
conditional condition
kPA PSI kPA
30
210
33 230
33 230 36 250
30 210 33 230
35 240
44 300
30 210 33 230
33 230 36 250
30 210
33 230
35 240 44 300
I t •

Tires and wheels -
----------------
•
& WARNING (continued)
• 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.
• Always make sure that the total load being transported -
including the weight of a trailer hitch and the tongue weight of a
loaded trailer -does not make the vehicle heavier than the
vehicle's Gross Vehicle Weight Rating.
& 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.
• 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
either on driver's side 8-pillar or inside the fuel filler flap.
The recommended tire pressures are on the tire pressure label and
in the table~
page 330, "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 330. The tires would then be
underinflated and could fail suddenly.
The tire pressure label on your Audi lists the recommended cold tire
inflation pressures at maximum capacity for the new, original equip ­
ment tires that were on your vehicle at the time it was manufac­
tured. For the location of the label
~ page 330, fig. 274.
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
pressure for a trip -even one that you would not consider to be
"long ." See~
page 335, "Tires and vehicle load limits" for more
important information.
Always use an accurate tire pressure gauge when checking and
adjusting 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
gauge and keep checking the pressure until you reach the pressure
that is correct for the load (passengers and luggage) and kind of
driving you plan to do.
If 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.
Never exceed the maximum inflation pressure listed on the tire
sidewall for any reason.
Remember that the vehicle manufacturer, not the tire manufacturer,
determines the correct tire pressure for the tires on your vehicle. .,,_
Vehicle care I t •