2008 PORSCHE CAYENNE air suspension

The Cayenne GTS has a sports
exhaust system that is also
available as an option on the
Cayenne S (in conjunction with
Tiptronic S). As well as enhancing
the engine sound, it features
chrome-plated dual-tube tailpipes.
The Cayenne models
Cayenne S and red on the Cayenne
GTS and Cayenne Turbo. All four
models are equipped with Porsche
Stability Management (PSM) as
standard. PSM is an electronic
active safety system that automat-
ically stabilises the car (and trailer,
if fitted) in critical road scenarios.
Another standard feature is the
‘Sport’ mode function. At the
push of a button, the engine
and Tiptronic S become more
responsive, the air suspension
drops to Low Level I, while PASM
and PDCC are also switched to
‘Sport’ mode.
Standard fitment wheels are 17-inch
Cayenne alloys on the Cayenne,
18-inch Cayenne S II alloys on the
Cayenne S and 19-inch Cayenne
Design alloys on the Cayenne Turbo.
Among the special sports features
on the Cayenne GTS are the stand-
ard 21-inch Cayenne Sport wheels.
The brake performance is more
than a match for the power of each
Cayenne model. All four cars have
six-piston monobloc aluminium fixed
calipers at the front and four-piston
units at the rear. The calipers are
black on the Cayenne, silver on the Another feature that’s standard on
the Cayenne Turbo and optional
on the other three models is self-
levelling air suspension with Porsche
Active Suspension Management
(PASM – see page 76). PASM
is an electronic damping control
system offering a choice of
increased comfort or added sports
performance. The Cayenne GTS
is equipped as standard with an
exclusive steel-sprung sports sus-
pension that also includes PASM.
The air suspension system and
PASM can also be combined with
Porsche Dynamic Chassis Control
(PDCC) on all models. This optional
system actively reduces body-roll
when cornering, thereby enhancing
turn-in response. The results: greater
agility, greater comfort and even
greater driving pleasure.For easier loading, there’s an
optional automatic tailgate with
user-programmable opening
height and push-button operation.
· 19 · · 18 ·

The Porsche ‘S’ has long been
a mark of heightened sports
performance. On the Cayenne S –
as on many cars before – it means
power, athleticism, more efficient
dynamics – even greater driving
pleasure.
To experience its effects, simply
drop down a gear on the six-speed
manual gearbox (option: six-speed
Tiptronic S) and open up the
throttle on the 4.8-litre V8 engine.
Thanks to direct fuel injection (DFI),
the effect is immediate with drive
transmitted to a set of 18-inch
Cayenne S II wheels. The car is
propelled to 100 km / h (62 mph) in
as little as 6.6 seconds. Maximum
speed is 252 km / h (157 mph).
The naturally aspirated V8 develops
283 kW (385 hp) at 6,200 rpm.
Maximum torque is 500 Nm
from 3,500 rpm. This exceptional
performance is, in part, achieved
with the aid of variable valve
timing and two-stage valve lift
(VarioCam Plus). This system is
also responsible for the smooth
running characteristics, significantly
improved fuel economy and lower
exhaust emissions.
The engine sound is typically
Porsche – even more so with the
optional sports exhaust system
(available in conjunction with
Tiptronic S). As well as enhancing
the acoustics of the car, it features
twin chrome-plated stainless
steel tailpipes. The sports exhaust
has a ‘Sport’ sound setting that
is automatically enabled when the
general ‘Sport’ mode is selected.
Reaches places that others can only dream of.
Like the heights of driving pleasure.
The Cayenne S.
The handling characteristics and
driving properties are exemplary
for a car of such versatility. Equally
impressive are the standard safety
systems, including larger brakes
with distinctive silver-finish calipers.
Porsche Stability Management (PSM)
is standard on all Cayenne models
and provides a further reduction in
braking distances (see page 98).
The Porsche Ceramic Composite
Brake (PCCB) is available as optional
equipment on the Cayenne S,
Cayenne GTS and Cayenne Turbo.
The driving dynamics can be
further enhanced with the optional
air suspension featuring Porsche
Active Suspension Management
(PASM – see page 76).
Model range
· 27 · · 26 ·

Breaking new ground.
On the road.
The Cayenne GTS.
Drive is transmitted through a
high-performance six-speed manual
gearbox or optional six-speed
Tiptronic S. The GTS model has
a shorter final-drive ratio than
the Cayenne S, which increases
acceleration. The benchmark sprint
to 100 km / h (62 mph) requires
just 6.1 seconds (with standard
manual gearbox). Maximum
speed is 253 km / h (157 mph).
The engine sound is specially
enhanced by the standard sports
exhaust system.
Developing the Cayenne GTS was
an exercise in what we do best:
more performance, more agility,
a more immediate driving experi-
ence. In short: more sport – both
visually and technically – designed
exclusively for the road.
The 4.8-litre naturally aspirated
V8 features direct fuel injection
(DFI). It also includes a range
of performance enhancements
compared with the Cayenne S.
The revised intake manifold and
engine management system
enable greater power and
efficiency. The results: 298 kW
(405 hp) at 6,500 rpm and
500 Nm of torque at 3,500 rpm.
Another special feature on the
Cayenne GTS is the combination
of steel-sprung sports suspension
and Porsche Active Suspension
Management (PASM) as standard
(air suspension available as an
option). The ride height has been
lowered by 24 mm (20 mm
on optional air suspension) to
improve handling and high-speed
stability. The car’s cornering
potential is immediately apparent
from the standard 21-inch
Cayenne Sport wheels.
Model range
· 31 · · 30 ·

Model range
More agility. More efficiency. More safety.
So far, it all makes perfect sense.
The Cayenne Turbo.
This enormous potential is trans-
mitted to the road through the stand-
ard six-speed Tiptronic S.Running
on 19-inch Cayenne Design
wheels,
the benchmark sprint to
100 km / h
(62 mph) is completed in just
5.1 seconds. At 210 km / h (131 mph),
the standard air suspen
sion is
automatically lowered to
increase
stability and aerodynamic
efficiency.
Maximum speed is 275 km / h
(171 mph).
Porsche Active Suspension
Management (PASM) continuously
modifies the damping force on
each wheel based on changing
road conditions and driving style.
The optional Porsche Dynamic
Chassis Control (PDCC) helps to
minimise body-roll when cornering.
This not only enhances occupant
comfort, it also improves contact
with the road. Pulse rate climbing. Shiver down
the spine. Both natural reactions
in a turbocharged Porsche.
The Cayenne Turbo is one of the
most remarkable examples of
the Porsche performance principle.
Blending power with comfort,
it does so in style without ever
compromising on either.
Start the ignition, and immediately
you sense the energy latent in
the 4.8-litre twin-turbo V8.
Featuring direct fuel injection (DFI),
it develops 368 kW (500 hp) at
6,000 rpm. Maximum torque
of 700 Nm is available between
2,250 and 4,500 rpm.Press the ‘Sport’ button on the
centre console and the throttle
becomes more responsive,
the engine more dynamic and
Tiptronic S more direct. At
the same time, Porsche Active
Suspension Management (PASM)
is also switching to ‘Sport’ mode.
The air suspension is automatically
lowered to the more streamlined
Low Level I.
· 35 · · 34 ·

Controlling fuel delivery for optimum combustion.
Direct fuel injection (DFI).
Drive
designed to improve power, torque
and emissions. The swirling of the
injected fuel creates a homogenous
air/fuel mix, thereby enhancing
combustion.
At engine speeds up to 3,500 rpm,
a double injection process is used.
Here, the required fuel volume
is delivered in two successive
injections per working stroke. The
results are faster catalyst warm-up
and increased torque in the upper
load range. All four Cayenne engines feature
direct fuel injection.
As the name suggests, fuel is
injected directly into each
combustion chamber using electro-
magnetic injectors offering
extremely high precision in
terms of both timing and volume.
A high-pressure pump provides
the necessary pressure of up to
120 bar.
The injector position and spray
geometry have been carefully
From road to racetrack. At the push of a button.
‘Sport’ button.
Throttle response in ‘Sport’ mode
Throttle response
in ‘Normal’ mode
Both sets of characteristicsare dependent on engine
speed.
Pedal travel (%)
(%) Torque
(as percentage of maximum)
All Cayenne models have a
standard ‘Sport’ function with
a choice of comfort-oriented
(‘Normal’) or high-performance
(‘Sport’) setup.
When ‘Sport’ mode is enabled
using a button on the centre
console, the engine management
system selects a more ‘aggressive’
map for the electronic throttle.
The pedal response is quicker
and the engine more dynamic
and direct. On vehicles with
Tiptronic S, upshifts are performed
later, downshifts earlier. The
chassis control systems PASM
and PDCC (if present) are also
set to ‘Sport’ mode. Cars with
air suspension are lowered to
Low Level I, creating a firmer
ride, more positive turn-in and
better contact with the road.
The ‘Sport’ sound mode on the
sports exhaust system (standard
on Cayenne GTS; optional on
Cayenne S with Tiptronic S) is
also enabled when ‘Sport’ mode
is selected.
‘Sport’ button on centre console Comparison of electronic throttle map in ‘Normal’ and ‘Sport’ mode
By mixing the fuel and air directly
in the combustion chamber, DFI
contributes to engine cooling.
As a result, it was possible
to increase the compression
ratio and therefore output and
efficiency.
The engine management system
regulates the injection process
based on changing output require-
ments. Oxygen sensor circuits
are used to monitor emissions
and minimize impact on the
environment (see page 60). This
also reduces ownership costs.
· 51 · · 50 ·

Cayenne Turbo
1. Compressed air cylinder
2. Air suspension and PASM
control unit
3. Air suspension struts
4. Air suspension compressor5. Catalytic converter
6. Silencers
7. Gear selector unit
(Tiptronic S)
8. Tiptronic S transmission9. Two-stage transfer
gearbox with lockable
centre differential
10. Double wishbone
suspension
11. Multi-link suspension
10
11
1
1
2
3
3
34
5
7
89
6
· 71 · · 70 ·
Chassis

Chassis
Active damping adjustment for optimum performance and comfort.
Porsche Active Suspension Management (PASM).
Both systems are optional on
the Cayenne and Cayenne S. The
Cayenne GTS has an exclusive
combination of PASM and high-
performance steel-sprung suspen-
sion (ride height lowered by 24 mm).
During performance driving or
heavy off-road use, there is a
greater tendency for the body
to roll. PASM prevents this from
happening, thereby improving
stability and occupant comfort.
PASM has three setup modes:
‘Comfort’, ‘Normal’ and ‘Sport’.
In all three cases, the system
uses a series of sensors to
monitor the movement of the
body, e.g., under acceleration and
braking or on poor road surfaces.
It also gathers data on lateral
acceleration, steering angle, brake
pressure and engine torque. The
PASM control unit then evaluates
this information and modifies the
damping forces in accordance
with the selected mode.
PASM remains active at
all times, adapting to the
changing conditions.
If the road surface deteriorates
while travelling in ‘Sport’ mode,
for instance, the system
immediately changes to a softer
rating, thereby improving road
contact. When the road surface
improves, PASM automatically
reverts to the original, harder
rating. This not only increases
stability and safety, it also
enhances comfort.
PASM is an electronic damping
control system. It offers continuous
adjustment of individual damping
forces based on current road
conditions and driving style. PASM
is standard on the Cayenne Turbo
in conjunction with air suspension.
· 77 · · 76 ·PASM control with ‘Comfort’, ’Normal’ and ‘Sport’ options

Chassis
No matter how tough the terrain, you are literally floating on air.
Air suspension.
High Level II: 271 mm
Cayenne GTS: 251 mm
Normal Level: 215 mm
Cayenne GTS: 195 mm
Loading Level: 161 mm
1. High Level II.
56 mm above Normal Level,
maximum ground clearance:
271 mm. Selectable at speeds
of up to 30 km / h (19 mph) for
extreme off-road use. Maximum
approach angle on gradients: 31.8°.
2. High Level I.
26 mm above Normal Level,
maximum ground clearance:
241 mm. Selectable at speeds
of up to 80 km / h (50 mph) for
off-road use.
3. Normal Level.
Maximum ground clearance:
215 mm at DIN unladen
weight/ EC. Standard ride height
on Cayenne models.
4. Low Level I.
24 mm below Normal Level,
maximum ground clearance:
191 mm. Suspension is firmer
and drag is reduced. Automatically
selected above 125 km / h
(78 mph).
5. Low Level II.
34 mm below Normal Level,
maximum ground clearance:
181 mm. Automatically selected
above 210 km / h (131 mph),
not manually selectable.
6. Loading Level.
54 mm below Normal Level,
maximum ground clearance:
161 mm. Lowest available setting,
enabling easier loading of vehicle.
Only selectable when vehicle
is stationary. When setting off,
suspension automatically reverts
to Normal Level.
Cayenne GTS.**
The Cayenne GTS is 20 mm lower
than the other Cayenne models
at Normal Level, High Level I and
High Level II, and 5 mm lower at
Low Level I. All other ride-height
settings (Low Level II and Loading
Level) are the same.
The Cayenne Turbo has an air
suspension system featuring
self-levelling, ride-height control
and PASM as standard. The
system is optional on the Cayenne,
Cayenne S and Cayenne GTS*.
On the Cayenne GTS, there’s a
20-mm reduction in ride height
at Normal Level, High Level I and
High Level II.
The self-levelling facility maintains
a constant ground clearance,
regardless of vehicle load. With
the ride-height control on the
centre console, you can easily
vary the ground clearance. The
current ride-height setting is
indicated in the instrument cluster
and on a separate LED display
on the centre console.
** PASM standard on Cayenne GTS.
** With air suspension.
· 79 · · 78 ·