2008 PORSCHE CAYENNE heating

There is one fuel that will always be free.
Which is why we make the most of it.
Air intake system.
The Cayenne models are all
equipped with a resonance air
intake system. This simple
technology uses the pressure
waves generated by the inlet
valves to ‘force’ air into the engine.
The effect is enhanced in
the Cayenne, Cayenne S and
Cayenne GTS by a two-stage
intake manifold. This combines all
the benefits of a long intake tube
(higher torque at low rpm) with
those of a shorter length (more
power at higher rpm). On theCayenne GTS, performance is
enhanced by optimised airflow
management in the intake manifold.
Although ‘naturally aspirated’,
the Cayenne, Cayenne S and
Cayenne GTS provide high torque
ratings across the entire engine
speed range.
Drive
Pressure is often the key to performance.
Turbocharging system in the Cayenne Turbo.
The Porsche Turbo is synonymous
with performance, exhilarating
acoustics and the finest engineering.
The Cayenne Turbo has twin
turbocharger units arranged in
parallel. The low-volume intake
pipes combine with short exhaust
manifolds to achieve a rapid,
emphatic response.
Incoming air is passed through a
filter and compressed by the turbine
units. Its temperature is then
reduced in the intercooler system,
which improves cylinder charging
and limits thermal loads on the
engine.
Boost pressure reaches 1.8 bar
(absolute pressure) under full
acceleration from just 2,500 rpm.In normal road driving (part-throttle
mode), the pre-throttle boost
pressure is reduced in order
to
maximise fuel economy. When
the car is driven more assertively,
the
turbines are ‘pre-spun’ so
as to increase the pressure
available. When the throttle is
finally opened, the boost can
be applied immediately.
Both turbo units are cooled by
dedicated circuits from the main
engine cooling system.This solutionprevents oil degradation due to
overheating.
For the driver, the result is
seamless delivery of phenomenal
power and torque.
· 55 · · 54 ·

· 58 · · 57 · · 56 ·
Used to regulate /control Input data Used to regulate /control
Engine management system
(MED 9.1)
Engine load
Throttle-valve angle
Oxygen sensor signals
Engine speed (from crankshaft)
Inlet camshaft phase angle
Knock sensor signals
Vehicle speed
Air-conditioning settings
Throttle pedal position
Temperatures
– Coolant
– Intake air
– Engine oil
– Ambient air
Zündung
Direct fuel injection (DFI)
Idling via throttle valve and ignition
Heating elements in oxygen sensors
Demand-controlled fuel pump
Fuel-tank venting
CAN interface to PSM control unit, transmission control unit, engine immobiliser, instrument cluster,
air-conditioning control unit, ‘Sport’ button, on-board diagnostics, etc.
Input data
Camshaft phase angle
Engine fan
Starter
Fuel pressure
Throttle valve
Intake manifold resonance valve
Engine management functions in the Cayenne S, Cayenne GTS and Cayenne Turbo. Engine management functions in the Cayenne.
Drive
Maximum freedom requires total control.
Electronic engine management.
The electronic engine management
system provides coordinated
regulation of all engine functions
and associated systems in all
operating conditions.
The basic principle of engine
management is simple. Throughout
each journey, the system monitors
a range of input data and compares
it with corresponding sets of
reference values (‘maps’). Key
engine functions, such as ignition
and fuel injection, can be seamlessly
and automatically adjusted. The
results: optimum fuel economy and
lower emissions as well as greater
power and torque.One of the most important systems
controlled by engine management
is the electronic throttle, a
prerequisitefor Porsche Stability
Management
(PSM). Other major
functions include on-board diagnos-
tics and cylinder-specific knock
control featuring automatic compen-
sation for changes in fuel quality.
On the Cayenne, Cayenne S
and Cayenne GTS, the engine
management system controls
the variable-tract intake manifold.
On the Cayenne Turbo, it regulates
the turbo boost pressure.
Fuel pressure
Oil pressure
Engine management system
(EMS SDI 4.1)
Throttle-valve angle
Oxygen sensor signals
Engine speed (from crankshaft)
Inlet camshaft phase angle
Knock sensor signals
Vehicle speed
Air-conditioning settings
Throttle pedal position
Temperatures
– Coolant
– Intake air
– Engine oil
– Ambient air
Ignition
Direct fuel injection (DFI)
Idling via throttle valve and ignition
Heating elements in oxygen sensors
Demand-controlled fuel pump
Fuel-tank venting
CAN interface to PSM control unit, transmission control unit, engine immobiliser, instrument cluster,
air-conditioning control unit, ‘Sport’ button, on-board diagnostics, etc.
Valve lift (VarioCam Plus)
Engine fan
Starter
Fuel pressure
Throttle valve
Intake manifold resonance valve
(Cayenne S/Cayenne GTS)
Fuel pressure
Oil pressure
Wastegate frequency valve
(Cayenne Turbo only)
Bypass valves (Cayenne Turbo only)
Camshaft phase angle
Oil pressure
Engine load
Ignition
Cylinder-specific knock control
Cylinder-specific knock control

· 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

Personalisation
Interior.
Option I no. Page
• Steering wheel, padded• ••
•••
•1MV, 1MW74
• Comfort seats with comfort memory package
• ••
•–
•PE1 117
• Sports seats with comfort memory package
• ••
••wPE2, 3 116
• Driver memory package (driver’s seat and exterior
• ••
•––PG1
mirrors incl. courtesy lighting preferences)
• Seat heating (front) including steering wheel heating
• ••
••
•–PK1, 3
• Seat heating (front and rear) including steering wheel heating
• ••
••
••PK2, 4
• Sunscreen on rear side windows (manual)
• ••
••
••
•3Y4
Comfort seat with comfort memory package and
seat centre in soft ruffled leather Floor mats
· 165 · · 164 ·
Interior.
Option I no. Page
• Comfort lighting package: dimmable interior comfort lighting,• ••
••
••
•PO1, 2 127
courtesy lights on exterior mirrors, automatic headlight activation,
automatically dimming interior and exterior mirrors,
programmable-delay courtesy lighting with dipped headlights
(‘Welcome Home’ function)
• HomeLink
®(garage-door opener) • ••
••
••
•VC1
• Cruise control
• ••
••
••8T1 126
• 3-spoke multifunction steering wheel in leather
• ••
••
••
•PI2 114
(available in a range of trim options, see price list for details)
3-spoke multifunction steering wheel with Tiptronic S gearshift controlsHomeLink®
– not available •
•extra-cost option • standard equipment W no-cost option
For more information on the options featured in this catalogue, please refer to the price list.
Cayenne
Cayenne S
Cayenne GTS
Cayenne Turbo
Cayenne
Cayenne S
Cayenne GTS
Cayenne Turbo

Personalisation
· 167 · · 166 ·
Interior.
Option I no. Page
• Automatic air conditioning with separate • ••••9AD 122
temperature adjustment for driver and front passenger
• 4-zone air-conditioning system
• ••
••
••
•9AH 122
• Auxiliary heating system
• ••
••
••
•7VL
• Ski bag
wwww3X1 119
• Loadspace management system
• ••
••
••
•3GN 145
Sports seats with ski bag
Interior.
Option I no. Page
• Outer door-sill guards in stainless steel • ••–
•7M1 28
• Outer door-sill guards in stainless steel with Cayenne GTS logo
––
•–32
• Preparation for vehicle tracking system (incl. tilt sensor)
• ••
••
••
•7G1 126
• Non-smoker package
wwww9JA
• Fire extinguisher
• ••
••
••
•6A5, 7
• Floor mats•
••
••
••
•0TD
Outer door-sill guards in stainless steel
– not available •
•extra-cost option • standard equipment W no-cost option
For more information on the options featured in this catalogue, please refer to the price list.
Cayenne
Cayenne S
Cayenne GTS
Cayenne Turbo
Cayenne
Cayenne S
Cayenne GTS
Cayenne Turbo