2015 AUDI S8 engine

88 On the road
switched off. More force is required to
stop and to steer the vehicle.
- To reduce the risk of injuries, make sure
that the Start-Stop-System is turned off
when working in the engine compart­
me nt¢
page 89.
(D Note
Always switch off the Start-Stop -System
when driving through water ¢
page 89.
Starting/stopping the engine
Applies to vehicles: with Start-Stop-System
Fig . 91 In strument duster : eng ine switc hed off (stop
phase)
~ Slow the vehicle to a stop using the brake
and keep pressing the brake pedal. The en­
gine w ill switch off. The
11] indicator light
appears in the information line in the instru­
ment cluster display.
~ When you take your foot off the brake ped­
al, the engine restarts . The ind icator light
turns off.
Additional information
The engine w ill switch off in the P, D, N and S
positions as well as in manua l mode. In the P
position, the e ngine will also remain off if you
take your foot off the brake pedal. The engine
starts again when you select another se lector
lever position and take your foot off the brake
pedal.
If you select the R position during a Stop
phase, the engine will start again .
Shift from D to P quickly to prevent the engine
from starting unintentionally when shifting
through R. You
can determine for yourself if the engine
will stop or not by reducing or increasing the
amount of force you use to press the brake
pedal. For example, if you only lightly press
on the brake pedal in stop-and and-go traffic
or when turning, the engine will not switch off
when the vehicle is stationary. As soon as you
press the brake down harder, the engine wi ll
switch off.
General information
Applies to vehicles: with Start-Stop-System
The standard Start-Stop-mode can be cancel­
led for different system-related reasons.
Fig. 92 Instrument cluster: eng ine -Stop temporarily
unavailable
Engine will not switch off
Before each stop phase, the system checks if
certain conditions have been met. For exam­
ple, the eng ine will
not be switched off in the
following situations:
- The engine has not reached the minimum
requ ired temperature for Start-Stop-mode.
- The interior temperature selected by the A/C
system has not been reached.
- The outside temperature is extremely high/
low.
- The windshield is being defrosted
¢page 81.
-The parking system* is switched on.
- The battery charge level is too low.
- The steering wheel is sharply turned or
there is a steering movement.
- After engaging the reverse gear.
- On sharp incl ines.

The@j indicator light appears in the informa ­
tion line in the instrument cluster display
<:!)fig. 92 .
Engine automatically restarts
The stop phase is interrupted in the following
situations, for examp le. The engi ne restarts
without any action by the driver.
- Th e interior temperature varies from the
temperatu re selected in the A/C system.
- The windshield is being defrosted
r::!) page 81 .
-The brake pedal is pressed several times in a
row.
- The battery charge level becomes too low.
- High power consumption .
Switching the ignition off automatically
To prevent the battery from draining, the igni­
tion will switch off
automatically when all of
the following conditions have been met:
- The vehicle has al ready been driven.
- The eng ine has been turned off by the Start-
Stop-System*.
- The driver's door is opened.
- The driver's seat belt is removed .
- The brake pedal is not pressed down.
- The vehicle is stationary .
In this case, the activated low beam will be re­
placed by the side marker lights. The side
marker lights will switch off after approxi­
mately 30 minutes or when you lock the vehi­
cle .
If the Start-Stop System has
not turned off
the engine or if you have switched the Start­
Stop system off manually, the ignition w ill
not
be automatically switched off and the engine
will cont inue to run
r::!) .&. .
A WARNING
Never allow the engine to run in confined
spaces - danger of asphyxiation.
(D Tips
If you shift into the D, N or S positions af­
ter shift ing into reverse, the veh icle must
On the road 89
be driven faster than 6 mph (10 km/h) in
order for the engine to switch off again.
Switching the Start-Stop-System on/off
manually
App lies to vehicles: wit h Start -Stop -System
If you do not wish to use the system, you can
switch it off manually.
Fig. 93 Center console: Start -Stop -System button
.,. To switch the Sta rt-Stop-System off/on
manually, p ress the
ICA.> ••I button. The L ED in
the button turns on when the system is
sw itched off.
(D Tips
If you switch the system off during a stop
phase, the engine will start again auto­
ma tically .
Messages in the instrument cluster
display
Applies to vehicles: wit h Start-Stop-Syste m
Start-Stop system deactivated: Please re­
start engine manually
This message appears when specific condi­
tions are not met during a stop phase and the
Start-Stop-System will
not be able to restart
the engine. If the Dor R selector lever posi­
tions were engaged, P will be selected auto­
matically . The engine must be started with
the
I START ENGINE ST OP ! button.
Start-Stop system: System fault! Function
unavailable
There is a malfunction in the Start-Stop-Sys­
tem. Drive the vehicle to an authorized repair .,.

90 On the road
facility for servicing as soon as possib le to
correct the malfunction.
Speed warning system
Introduction
The speed warning system helps you to stay
under a specified maximum speed.
The speed warning system warns you if you
are exceeding the maximum speed that you
have set . You will hear a warn ing tone when
your speed exceeds the stored value by ap­ proximately 3 mph (3 km/h). An indicator
light. (USA models) . (Canada models) in
the instrument cluster display also turns on at
the same time. The indicator light./.
turns off when the speed decreases below the
stored maximum speed.
Sett ing a threshold is recommended if you
wo uld like to be reminded when you reach a
certain maximum speed . Situations where you
may want to do so include driving in a country
with a general speed limit or if there is a
specif ied maximum speed for winter tires.
@ Tips
Even though your vehicle is equipped with
a speed warning system, you should still
watch the speedometer to make sure you
are not driving faster than the speed lim it.
Setting the threshold
You can set, change and delete the threshold
in the MMI.
.. Se lect : ICAR lfunction button> Car systems
control button > Driver assist > Speed warn­
ing.
You can set any threshold between 20 mph
(30 km/h) and 150 mph (240 km/h). Settings
can each be adjusted in increments of S mph
(10 km/h).
Cruise control
Switching on
The cruise control system makes it possible to
drive at a constant speed starting at 20 mph (30kmlh) .
0
•
~
0
Fig. 94 Control leve r with set b utton
Fig. 95 Display: Se lected speed
.. Pull the lever to position (D c::> fig. 94 to
sw itch the system on.
.. Drive at the speed you wish to set.
.. Press button @ to set that speed.
T he stored speed and the indicator light
II (US models) ;El (Canadian mode ls) ap­
pear in the instrument cluster display
c::> fig. 95 . The display may vary, depending on
the type of display in your veh icle .
T his information is also shown briefly in the
Head-up Display*.
Th e speed is kept constant via an engine out­
put adjustment or active brake intervent ion.
WARNING
-Always pay attention to traffic even when
the cruise control is switched on. You are
a.lways respons ible for your speed and
Ill-

108 Audi drive select
Audi drive select
Driving settings
Introduction
Audi drive select makes it possible to experi­
ence different types of vehicle settings in one
vehicle. The driver can select three
Comfort,
Auto
and Dynamic modes in the MMI to
switch between a sporty and a comfortable
driving mode.
You can a lso adjust the setting according to
your preferences in the
individual mode. For
example, you can combine settings such as a
sporty engine tuning with comfortab le steer­
ing.
A WARNING
Improper use of the Audi drive select can
cause collisions, other accidents and seri­
ous personal injury.
Description
The vehicle setup in each mode depends on
the vehicle's features. The engine, transmis­
sion, steering, reversible safety belt tension­
ers and adaptive air suspension are always in­
volved.
Engine and transmission
Depending on the mode, the engine and the
transmission respond quicker or in a more bal­
anced manner to acce le rator pedal move­
ments. In the sporty dynamic mode, the
transmission shifts at higher RPMs.
Air suspension
The adaptive air suspension/adaptive air sus­
pension sport*
(Ai r suspension in the MMI) is
an electronically control led air suspension and
damping system. They are adjusted depend­
ing on the selected driving mode, the driver's
steering, braking and acceleration input and
the road surface, vehicle speed and load. A
sporty setting is generally used in vehicles
with adaptive air suspension sport*. The
vehicle clearance varies depending on the
selected mode and the speed .
The highway setting is activated automatically
when you drive above 75 mph (120 km/h) for
more than
30 seconds in the auto or dynamic
mode. The ground clearance is increased auto­
matically if the speed drops below
44 mph
(70 km/h) for more than 120 seconds.
Steering
The steering adapts in terms of steering effort
and steering ratios . Indirect steering that
moves easily, like the steering in comfort
mode, is best suited to long drives on a high­
way. In contrast, dynamic mode provides
sporty, direct steering .
The following applies to vehicles with dynamic
steering* : the steering ratio changes based on
vehicle speed in order to maintain optimum
steering effort for the driver at all times. This
sets the steering to be less sensitive at higher
speeds in order to provide improved vehicle
control. At reduced speeds, however, steer ing
is more direct in order to keep the steering ef­
fort as minimal as poss ible when the driver is
maneuvering the vehicle. At low and average
speeds, dynamic steering additionally pro ­
vides more responsive steering performance.
Sport differential*
As a component of the all whee l dr ive system
(quattro)
r:!> page 202, the Sport differential*
distributes the driving power to the rear axle
depending on the situation . The distribution
of power varies depending on the selected
mode, from balanced (comfort) to agile (dy­
namic). The goal is a high level of agility and
ability to accelerate on curves . The vehicle is
very respons ive to steering .
Curve light*
The curve light adapts to driving on curves.
The pivoting action and the lighting are also adapted to the mode.
Adaptive cruise control*
The behavior when accelerating can be adjust­
ed from comfortab le to sporty, depending on ..,.

the drive select mode. Adaptive cruise control
also responds to the driving behavior of the
veh icle ahead in a more conservative or sporty
manner.
E ngin e soun d*
The sound of the engine is adapted to the se­
l ected mode and ranges from subtle to sporty.
(D Note
- Make sure there is eno ugh clea rance
above and below the veh icle when park­
i ng. The height of the vehicle can change
once it is parked due to temperature
fluctuations, changes to the load cond i­
tions and changes to the dr iv ing modes,
which can affect clearance.
- When transporting the veh icle on a car
carrier, tra in, ship or by other means, on­
ly tie the veh icle down at the running
surface of the tires, which is the outer
circumference. Secur ing the vehicle at
the axle components, s uspension struts
or tow ing eyes is not pe rm itted because
the pressure in the air suspension stru ts
can cha nge during transport . The vehicle
may not be sec ured s ufficient ly if this
happens.
- If you a re going to tow a trailer, you
must activate the trailer operation mode
C? poge210.
@ Tips
- In some models, the maximum vehicle
speed can only be reached in the
auto
and dynami c modes.
- Se lecting the
d ynamic mode results in
sporty shifting characteristics . The S
gear position engages automatically.
- In vehicles that have dynamic steering*,
operating noise is heard when starting or
stopping the engine. Th is does not indi­
cate a problem.
Audi dri ve sele ct 109
-In ve hicles w ith sport differentia l*, the
dynamic mode is deactivated when tow­
ing a trailer.
Selecting the driving mode
You con choose between Comfort, Auto, Dy­
namic and Individual.
F ig. 116 MMI: Drive select
.,. To select the mode, se lect the following in
the MMI:
I CARI function button > C om fort ,
Auto , Dynamic or Individu al.
You can change the driving mode when the ve­
hicle is stationary or wh ile driving. If traffic
permits, after changing modes, briefly take
your foot off the accelerator pedal so that the recently selected mode is also activated for
the engine.
comfort -provides a comfort-oriented ve hicle
setup a nd is suited for long drives on h igh­
ways .
auto -provides an overall comfortable yet dy­
namic dr iving feel and is suited for every day
use .
dy nami c -gives the driver a sporty driving fee l
and is suited to a sporty driv ing style.
indi vidual -¢page 110.
A WARNING
Pay attention to traffic when operating
Audi drive select to prevent potential risk
of an accident.

110 Audi drive select
Adjusting the Individual mode
You can adjust the vehicle settings to your personal preferences .
• Se lect : I CAR ! function button > Set individu­
al
control button. You can now adjust the in­
dividual systems.
The
individual driving mode will automatical­
ly be activated when you have finished config­
uring the settings .
Systems Comfort
Engine
and Transmission balanced
Air suspension comfortable
Steering comfortable The equipment
in your vehicle will determine
which settings you can adjust. The following
table provides an overview of the characteris­
tics of each driving mode.
Auto Dynamic
balanced sporty
balanced sporty
balanced sporty
Dynamic steering* comfortable/indirect balanced/direct sporty/direct
Sport differential * balanced agile sporty
Curve light* comfortable balanced sporty
Belt
tensioner Standard Standard Deployment time
adapted
Adaptive cruise control* comfortable
balanced sporty
Engine
sound* subtle subtle/sportya> sporty
a) Subt le in th e d riv ing posi tion D an d sp or ty in the driving pos itio n S
(D Tips
Your individual mode settings are auto­
matically stored and assigned to the re­
mote control key being used.
Raising/lowering the
vehicle
Raising the vehicle
You can raise your vehicle temporarily, for ex­
ample to drive over a tall curb .
• Se lect the following in the MMI:
I CAR I func­
tion button
> Raise control button.
• Wait for the arrows in the display to stop
blinking and the vehicle to reach its final po­
sition .
Lowering the vehicle
• To lower the veh icle, select the following in
the MMI:
ICARI function button > Lower con­
tro l button. •
Wait for the arrows in the display to stop
blinking and the vehicle to lower comp lete­
ly.
0 Note
- Remember that your vehicle is not suita­
ble for driv in g offroad even when it is
raised. There is not enough ground clear­
ance.
- If the vehicle is raised, it will lower auto­
matically when driving 62 mph (100 km/
h) or faster .
Driver messages
Air suspension: vehicle currently too low.
Level control running
Air suspension: vehicle currently too high.
Level control running
The driver message switches off when the lev­
el control process is complete .

,....,
N ,....,
N
0 J:
'SI: ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
Selector lever lock
The selector lever lock prevents you from se­l ecting a position unintentionally, causing the
vehicle to roll. When engaging some selector lever positions, you must press the button on
the selector lever
c:> fig. 124 and/or press the
brake pedal.
You must press the brake pedal to engage a
selector lever position when the engine is run­
ning while the vehicle is stationary. The ar­
rows
c:> fig. 125 indicate when you need to
press the button on the selector lever.
The selector lever does not lock if you shift
from D to R within one second. This allows
you to "rock" the vehicle to free it when it is
stuck.
P- Park
The whee ls are locked in this position. Only
shift into park when the vehicle is stationary
c:> &. To engage the P se lector lever position,
press the button on the selector lever and
shift into the P position .
You can only shift out of park when the engine is running and you are pressing the brake ped­
al. Press the button on the selector lever to
release the parking lock and select the desired
selector lever pos it ion .
P engages automatically when you switch the
engine off while D, Sor R is engaged or in
manual mode .
If you switch the engine off when N is engag ­
ed, the transmission remains in N for approxi­
mately 30 minutes and then Pis engaged.
You must use the emergency release proce­ dure to release the parking lock before towing
the vehicle
c:> page 119.
R -Reverse
The reverse gear is engaged in this position .
Only select reverse when the vehicle is sta ­
tionary and the engine is running at idle speed
c:> &. To engage the R selector lever position,
press the button on the selector lever, press
Automatic Transmission 115
the brake peda l and move the selector lever
into the R position.
T he back-up lights turn on when you select
the R selector lever position wh ile the engine
is running .
N -Neutral
The transmission is in idle in this pos it ion . To
engage the N selector lever posit ion, press
the button on the selector lever and shift into
the N position.
If you switch the eng ine off when N is engag­
ed, the transmission remains in N for approxi­
mately 30 minutes and then Pis engaged.
You cannot select the N position when the ig­
nition is switched off. When driv ing through
an automat ic car wash, first select the N posi ­
tion and then switch the engine off
c:> table on
page 216.
The veh icle cannot be locked when the selec­
tor lever is in the N position.
D/S - Posit ion for driv ing forward
In the D/S position, the transmission can be
operated either in the normal mode D or in
the sport mode S . You can only select the S se­
lector lever position when Dis engaged. Move
the selector lever back to engage the S selec­
tor lever position. To select the D selector lev­
er position again when Sis engaged, move the
selector lever back
c:> .&. . To shift from N to D
when traveling at speeds below 1 mph (2km/
h), press the brake peda l and select the D se­
lector lever position
c:> .&. .
In the normal mode D, the transmission auto ­
matically selects the suitable gear ratio.
It de­
pends on engine load, vehicle speed and driv­
ing style.
Se lect the
sport mode S for sporty driving.
The vehicle makes fu ll use of the engine's
power. Shift ing may become noticeab le when
accelerat ing.
The S selector lever position engages auto­
matically when you select the dynamic mode
in Audi drive select.
liJI,

116 Automatic Tran sm iss ion
& WARNING
-Never e ngag e R or P w hile driving . It
could cause a cras h.
-
-Power is sti ll t ransmi tte d to t he whee ls
whe n the e ngine is runni ng at idle . To
prevent the vehicle from "creepin g", you
must keep your foot on the brake in all
selector lever positions except P and N
when the eng ine is running. Do not inad­
vertent ly press the accelerator pedal
when the veh icle is stationary . Otherwise
the vehicle will s tart to move immediate­
ly. This cou ld happen even if the parking
brake is activa ted .
- Be fore opening the hood, select the P se­
lector lever position and set the par king
brake. This red uces the risk of a crash. Al­
ways read and follow the applicable
warnings
<=)page 228.
-Never get out of the driver's seat when
the engine is running.
- If you mus t get out of the vehicle, move
the se lector lever securely into the P po ­
sition an d apply the park ing brake .
(D Tips
-If you u nin tentionally shift into the N se­
l ector lever posi tion while dr iv ing, ta ke
your foot off the acce lerator pedal and
wait for the e ngine to slow down until it
i s idling before you shift into Dor S.
Driving tips
The gears shi~ automatically .
Starting from a stop
"" Press and ho ld the brake pedal.
"" Sta rt the eng ine
c:> page 83.
"" Press the but ton on the se lector lever and
select the D, S or R selecto r lever pos it ion
c:> page 114 .
""Wait a moment until the transmission
shifts. You w ill not ice a slight movement
when the gear engages .
"" Re lease the brake pedal and press the accel­
erator pedal¢ ,& .
Stopping temporarily
""Press the brake pedal to s top the ve hicle, for
examp le a t a traffic light . Do not press the
accelerato r peda l when doing this.
"" To prevent the vehicle from ro lling when yo u
start dr iving, set the parking brake when
stopping on large incl ines
c:> ,& .
"" The parking brake will release automat ica lly
and the vehicle will start mov ing once you
press the acce lerator pedal.
Parking
If the se lector lever is not in the P position
whe n you open the driver's door, the ve hicle
could roll. The message
Transmission: Car
may roll! Shift to park!
appears .
"" Press and hold the brake pedal¢ ,& .
"" Set the park ing brake.
"" To engage the P se lector lever position,
press the button on the selector lever and
shift into the P posit ion
c:> page 114 .
Under certa in conditions such as dr iv ing in the
mountains or when towing a trailer, it may be
helpful to switch to manual mode tempo rari ly
to shift
manually to adapt to the driving con­
di tions
c:> page 117.
On s lopes, activate the parki ng bra ke first and
then move the selecto r leve r to the P position .
T his prevents too much st ress from be ing
pla ced on the locking mec hanism.
& WARNING
Read an d fol low all WAR NIN GS ¢ .&. in Se­
lecting a selector lever position on
page 116.
- The vehicle can also roll when the engine
is stopped.
- Do not press t he acceler ator pe dal when
chan ging the se lector leve r posi tion
while the veh icle is stationary and t he
engine is running . This cou ld result in a
crash.
- Never engage R o r P while driving .
It
could cause a crash.
- Power is still transmitted to the wheels
when the engine is runn ing at idle. To
IJJ,,