2008 PORSCHE CAYENNE fuel cap

Versatility. The spirit of the
Cayenne. Superlative performance
on road and track. Exceptional
capability off road. Powerful yet
practical in every scenario. Always
100 % Porsche.
Enhancing your enjoyment is the
new Porsche Communication
Management (PCM) featuring
navigation, touchscreen display
and MP3 compatibility. Sports
seats with added lateral support
are available for all four Cayenne
models (standard in Cayenne GTS).
The Porsche Ceramic Composite
Brake (PCCB) is optional equipment
on the Cayenne S, Cayenne GTS
and Cayenne Turbo.
The Cayenne range comprises
four unique models, each with a
powerful presence. Agile and
dynamic, they generate excite-
ment in their own individual way.
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Performance. It’s what motivates
our engineers – and exhilarates
our drivers. Winning races,
exploring new terrain, achieving
new objectives.
With the Cayenne model range,
we’ve applied this power to an
ambitious range of applications.
The result is four highly
versatile cars – every
one of them a Porsche.
At Porsche, we believe in playing to our strength:
the pursuit of excellence in every respect.
The Cayenne models.
The Cayenne models
One thing they have in common
is the standards they set: in
performance, safety and economy.
The character of each car is
apparent at first glance: accom-
plished, athletic, brimming with
energy and potential. The front
and rear sections are elegantly
designed with excellent aerodynamic
properties. The flared wheel arches
accommodate a range of wheel
options up to 21 inches in diameter.
Among the most distinctive features
on all four models is the elongated
headlight geometry. In addition,
each car has LED taillights as
standard (see page 93).
The stylish form is brought
thrillingly to life with remarkable
engine performance. The high-
capacity engines offer increased
power and torque with relatively
modest fuel consumption. This is
achieved using a range of technol-
ogies
, including direct fuel injection
(DFI – see page 50) and VarioCam
Plus on the V8 engines (see page
53).
The sports-oriented suspension can
be further refined with the optional
Porsche Dynamic Chassis Control
(PDCC – see page 80), an active
anti-roll stability system. Safety is an equally important consideration,
with Porsche Stability Management
(PSM – see page 98) included
as standard equipment. The race-
proven Porsche Ceramic Composite
Brake (PCCB– see page 96) is
also available as optional equipment.
The Cayenne models.
Ready for every eventuality.

The standard Porsche Traction
Management (PTM – see page 66)
combines permanent all-wheel drive
with an electronically variable
centre differential, two-speed transfer
gearbox, anti-slip regulation (ASR)
and automatic brake differential
(ABD). The results are excellent
dynamics and greater active safety.
The Cayenne models
The Cayenne V6 develops 213 kW
(290 hp) at 6,200 rpm. Maximum
torque of 385 Nm is available
from 3,000 rpm. The V8 unit in
the Cayenne S produces 283 kW
(385 hp) and 500 Nm of torque
from 3,500 rpm.
In the Cayenne GTS, the V8 engine
develops 298 kW (405 hp) at
6,500 rpm plus 500 Nm of torque
from 3,500 rpm. Maximum output
ratings on the Cayenne Turbo are
368 kW (500 hp) at 6,000 rpm
and as much as 700 Nm of torque
between 2,250 and 4,500 rpm.
The Cayenne, Cayenne S and
Cayenne GTS are all equipped as
standard with a high-performance,
high-precision six-speed manual
gearbox. Alternatively, there’s the
option of six-speed Tiptronic S,
which is standard in the Cayenne
Turbo. Maximum speeds with
Tiptronic S are 227 km / h (141 mph)
for the Cayenne, 250 km / h (155
mph) for the Cayenne S, 251 km / h
(156 mph) for the Cayenne GTS
and 275 km / h (171 mph) for the
Cayenne Turbo.
Direct fuel injection (DFI) increases
engine output while improving fuel
efficiency. The V6 Cayenne has
variable valve timing on inlet and
exhaust. The V8 models feature
VarioCam Plus,combining variable
valve timing with two-stage valve
lift on the inlet side. The results:
high performance, low fuel
consumption and low exhaust
emissions. Seemingly paradoxical,
yet typically Porsche.
For extreme off-road driving,
there’s t
he optional Off-road
Technology package (see page
88), which is
available for the
Cayenne, Cayenne S
and Cayenne
Turbo.
The science: always breaking new ground.
Engineering.
The Cayenne models have high-
capacity engines featuring a range
of innovative technologies. Each
car reconciles the two extremes
of high performance and low fuel
consumption. The Cayenne has a
3.6-litre V6, the Cayenne S and
Cayenne GTS have 4.8-litre V8s,
while the Cayenne Turbo tops the
range with a 4.8-litre twin-turbo V8.
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Model range
Exceptional performance.
What else would you expect from a Porsche?
The Cayenne.
A high-performance six-speed
manual gearbox is standard
equipment. The optional six-speed
Tiptronic S includes gearshift
controls on the steering wheel.
It is also equipped with standby
control for better fuel economy
(see page 64).
The powerful brakes increase
active safety in all driving scenarios.
The black-finish calipers are unique
to the V6 model.
With its precision steering and
sports chassis setup, the Cayenne
is agile and responsive. Using
Porsche Traction Management (PTM)
and Porsche Stability Management
(PSM), power is transmitted through
the permanent all-wheel drive with
efficiency, precision and safety. In
difficult terrain, the electronically
variable centre differential combines
with the anti-slip regulation (ASR)
and automatic brake differential
(ABD) to maintain optimum traction
at all times. This ability is enhanced
in low-range mode, where all gear
ratios are reduced. As a result,
the car remains mobile in soft
ground and performs better when
towing a heavy trailer load. For
the toughest off-road conditions,
the electronically variable centre
differential can be fully locked while
in low-range mode using the PTM
control on the centre console.
The torque split is then fixed with
38 % of drive being transmitted
to the front wheels and 62 % to
the rear.
For extreme off-road use, there’s
the optional Off-road Technology
package. As well as increasing
underbody protection, it includes
an electronically variable rear
differential (see page 89). This
differential can also be manually
locked to increase off-road
traction.
The Cayenne is an excellent on-
road performer with a wide range
of other talents: off-road capability,
comfort, safety, sporting style and
practicality.
Its powerful V6 engine features
direct fuel injection (DFI), variable
valve timing on inlet and exhaust
and a variable resonance intake
manifold. The results: generous
performance and excellent fuel
economy.
The 3.6-litre engine develops
213 kW (290 hp) at 6,200 rpm.
Maximum torque is 385 Nm
from as low as 3,000 rpm. With
a manual gearbox, it requires
8.1 seconds to reach 100 km / h
(62 mph). Maximum speed is
227 km / h (141 mph).
Press the standard ‘Sport’ button
and the engine management is
adjusted to maximise throttle
response.
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440
400
360
320
280
24 0
20 0
160
120
80 900
850
800
750
700
650
600
550
500
450
2000 4000 6000
Our greatest motivation:
to exceed our own achievements.
Powerkit Cayenne Turbo.
The Porsche Turbo is a simple
concept: ultimate performance in
every respect. The Cayenne Turbo
continues this tradition with power,
dynamism and agility. This capability
can only be achieved when you’re
always striving to improve. Which
is why even the Cayenne Turbo
can offer increased power and,
with it, greater active safety.
The optional Powerkit Cayenne
Turbo increases maximum output
from 500 to 540 hp.
This is achieved using a new
intake manifold and a number
of modifications to the engine
management system. The result:
397 kW (540 hp) at 6,000 rpm.
Maximum torque is increased by
50 Nm to 750 Nm (between
2,250 and 4,500 rpm). Acceleration
to 100 km / h (62 mph) requires
just 4.9 seconds. Maximum speed
is 279 km / h (173 mph).
Even the engine compartment
immediately conveys the promise
of pure performance. Special
features include a throttle body
cover in carbon fibre and a plaque
in brushed aluminium. These are combined with a titanium-coloured
intake manifold with carbon inlays
and silver-coloured ‘turbo’ logo.
The propeller shaft has also been
revised to match the increased
loads. The overall result:
even greater exhilaration on
the racetrack, even greater
responsiveness on the road.
Drive
Powerkit Cayenne Turbo*
Fuel consumption**
Urban 22.5 l/100 km (12.6 mpg)
Extra urban 10.5 l/100 km (26.9 mpg)
Combined 14.9 l/100 km (19.0 mpg)
CO2emissionsCombined 358 g/km
· 47 · · 46 ·
397 kW
(540 hp)
Power (kW)
Torque (Nm)
Cayenne Turbo with Powerkit
Cayenne Turbo with standard engine
750 Nm
(2,250 – 4,500 rpm)
Engine speed (rpm)Cayenne Turbo engine with Powerkit
** Only available in conjunction with 19-inch Porsche wheels or larger (with requisite approval).
** Emissions were recorded in accordance with Directive 80/1268/ EC on standard vehicles as valid at the time of publication.
The respective figures were not recorded on individual vehicles and do not constitute part of the offer.
This data is provided solely
for the purposes of comparison between the respective models. For more information, pleasecontact your Porsche Centre.

Power is the product of efficiency.
Lightweight alloy engine construction.
‘Less is more’ – less weight, more
performance – is a key principle of
Porsche design.
The V8 Cayenne engines have
a ‘closed-deck’ aluminium
crankcase and lightweight
aluminium bedplate. The cylinder
block and its associated coolant
channels are therefore a fully
enclosed system. This not only
reduces the weight of the engine,
it also improves its dimensional
stability. Since the engine is
stronger, it also has a longer
service life.
Other major lightweight compon-
ents include cast aluminium
pistons and aluminium cylinder
heads. On the Cayenne Turbo, the
pistons are forged to compensate
for the higher loads.
The Cayenne V6 has a cast-iron
crankcase and one-piece cylinderheads in die-cast aluminium. This
combination produces high power
output while reducing the weight
of the engine.
Drive
Lightweight construction used on the V8 engines
Consistent performance and a longer service life.
Engine cooling system.
Each engine remains within its
optimum temperature range at
all times. Clearances throughout
the engine are extremely small,
thereby reducing wear. The entire
cooling system is designed for
prolonged
heavy-duty use, e.g.,
off-road driving or heavy towing
and carrying applications.
Emissions, noise and fuel
consumption remain low, while
power and torque are improved.
Lubrication.
The V8 engines use dry-sump
lubrication to ensure a consistent
supply of oil in all load conditions.
The oil reservoir is located inside
the engine. As well as saving
space and reducing weight, the oil
is always there where it’s needed.
Oil is circulated around the
V8 engines using a demand-driven
pump and two-stage scavenging
system, providing optimum
delivery in even the toughest
scenarios.
The V6 engine has a wet-sump
lubrication system that is
also designed for challenging
conditions, e.g., performance
road driving or extreme off-road
gradients.
A high-performance engine can
only maintain its optimum capability
over a long service life if all com-
ponents are operating consistently
within a specific temperature
range.
The V8 engines have an optimised
coolant management system offering
effective temperature control
throughout the engine. While 20 %
of coolant flows longitudinally
through the crankcase, 80 % serves
the cylinder heads using the
proven cross-flow principle (from
hot to cold).
On all Cayenne models, the piston
heads are cooled using oil-spray
jets integrated in the main lubrica-
tion system.
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· 61 · · 60 · · 59 ·
The smallest things can make the biggest difference.
Even a single spark.
Ignition system.
The Cayenne models have a
static high-voltage ignition
system with separate ignition
coils on each individual plug.
As well as providing a more consistent spark, this is a
more reliable alternative to
a conventional distributor and
leads. The role of distributor
is performed by the engine
management system. As well
as improving performance
and economy, emissions are
prevented at source.
Drive
Committed to a purer driving experience.
Exhaust system.Spend less on servicing.
And more time on the road.
the Cayenne S (in conjunction
with Tiptronic S), it has a
performance sound setting
which is automatically enabled in
‘Sport’ mode. The package also
includes twin dual-tube tailpipes
with chrome-plated finish. (Note:
vehicles equipped with the sports
exhaust system have a reduced
off-road capability.)
All exhaust systems – standard
and sports – comply with all
relevant emissions legislation.
Longer service intervals are
not only more convenient and
financially attractive, they are
also better for the environment.
Each Cayenne model offers
three clear benefits: lower
servicing costs, more time on
the road and a more eco-friendly
use of resources.For more information on service
intervals, please refer to the
separate price list for the Cayenne
model range.
Twin single-tube tailpipes
(Cayenne and Cayenne S)Twin dual-tube tailpipes
(Cayenne Turbo) Sports exhaust tailpipes, chrome-plated
(Cayenne GTS)
The lightweight exhaust systems
in the Cayenne models are made
f
rom special, long-life stainless
steel.
Short exhaust manifolds enable
rapid heating of the primary
catalysts, a basic prerequisite
for early and more effective
emissions control.
The engine management system
is also involved in preventing
emissions at source. Inside each
of the two primary catalytic
converters are two oxygen
sensors. These supply a real-time
analysis of exhaust gas compos-
ition. Based on this information,
the engine management system
can adjust the air/fuel mix as
required. This control system
ensures low emissions in all oper-
ating scenarios. The primary and
main catalysts offer high efficiency,
faster warm-up, a long service
life and consistently low emissions
(see page 104).
The Cayenne GTS has a sports
exhaust system as standard.
Also
available as an option on

Drive
The convenience of an automatic.
The excitement of a sequential gearbox.
Six-speed Tiptronic S.
Each gearshift point is automatically
selected based on current road
conditions and driving style.
Within a short space of time,
you’ll develop a feel for the
system and begin to influence
gearshifts using the throttle alone.
The benefits of Tiptronic S are most
apparent in high-performance driving.
The immediacy of response, with
practically no interruption in drive,
is comparable with that of a manual
gearbox.
Tiptronic S automatically selects
the optimum gearshift pattern,
even in low-range mode. The
low-range gearing is available at
speeds of up to 15 km / h (9 mph).
You can also return to high-range
mode at up to 30 km / h (19 mph).
For complete manual control,
simply slot into manual and use
the gearshift controls on the
steering wheel. If you prefer, you
can use the gear selector lever
on the centre console. Even in
automatic mode, you can change
gear manually via the rocker
controls on the steering wheel.
If there is no further manual
input for a period of 8 seconds,
the system reverts to automatic
mode.
One of the special features in
Tiptronic S is standby control.
When the car is stationary in an
active gear position and with the
foot brake applied, the input
clutch automatically disconnects
the engine from the driveline,
thereby reducing fuel consumption.
Other useful functions include
a warm-up programme which
temporarily suppresses upshifts
in order to accelerate warm-up
in the catalysts and thus reduce
emissions. If rapid throttle inputs
are detected, the system automat-
ically selects the ‘Sport’ gearshift
pattern, i.e., there is no need to
use a ‘kickdown’ function. When
the throttle is released quickly, e.g.,
on entering a corner, unwanted
downshifts are prevented.
Mid-corner gearshifts are also
suppressed, enhancing stability
and safety.Under heavy braking, Tiptronic S
shifts down to maximise engine
braking. An incline sensor enables
better uphill acceleration and
better engine braking on descent.
Another special feature, Porsche
Hill Holder, permits easy hill starts
without the need to use the brakes.
The gearbox cooling system is
specifically designed to match
the performance, transport,
towing and off-road capabilities
of all Cayenne models.
Tiptronic S is standard equipment
on the Cayenne Turbo and optional
on the other three models. The
six forward ratios transmit power
with smoothness, efficiency and
precision – whatever your choice
of terrain.
In automatic mode, the gearshift
maps range from maximum
economy to maximum performance.
Tiptronic S gearshift control on steering wheel
Tiptronic S gear selector
· 65 · · 64 ·

Environment
Fuel system.
We have also applied the highest
engineering standards to protect
the environment from fuel
evaporation. The non-return
fuel supply system provides a
considerable reduction in vapour
emissions. The fuel lines are
partly constructed from steel,
while those carrying vapour are
made from multi-layer plastics.
A large active-carbon filter and
multi-layer plastic fuel tank help
reduce evaporation even more.
A leak detection pump is also
included to monitor the integrity
of the fuel tank system.
Acoustics.
Think of a Porsche and what
do you hear? One of the most
distinctive sounds on the road.
A sound created not just by the
engine, but also by the absence
of unwanted noise. To minimise
Fuel economy.
At Porsche, we’re using innovative
technologies to increase perform-
ance while enhancing fuel economy.
With direct fuel injection (DFI),
we’ve made our engines more
efficient in terms of both output
and consumption. DFI is combined
with VarioCam Plus in the V8 engines
and variable valve timing in the
Cayenne V6. As well as improving
performance and economy, both
of these systems help to minimise
engine emissions. The low-drag
exterior on each Cayenne model
further improves efficiency.
Fuel.
All Porsche models are already
compatible with a fuel ethanol
content of up to 10 %. Ethanol
has a positive impact on the carbon
dioxide balance since the plants
grown for its production absorb
carbon dioxide from the atmosphere.
‘play’ between engine components
under all load conditions, we’ve
used stronger, lighter and more
temperature-resistant materials.
This reduces mechanical noise
and eliminates the need for engine
encapsulation. Large-volume
silencers and air intake manifolds
also help to minimise noise –
throughout the life of the car.
Tyre noise has been drastically
reduced in collaboration with
our official tyre partners. Wind
noise levels have also been
lowered thanks to aerodynamic
refinements.
All that remains is the Porsche
sound – as legendary as ever.
· 109 · · 108 ·