2011 PORSCHE CAYENNE sensor

response, even at low revs and
road speeds. This is particularly
useful when driving in urban
traf fic. The supercharger has a
low-temperature water cooling
system for cooling the charge air.
Variable Turbine Geometry in
the Cayenne Diesel.
The turbocharger in the
Cayenne Diesel features Variable
Turbine Geometry (V TG). The
gas-flow from the engine is
channelled onto the turbines via
electronically adjustable guide
vanes. By changing the vane
angle, the system can replicate
the geometry in all t ypes of
turbo, large or small , and thus
achieve the optimum gas-flow characteristics. As a result, even
at low engine rpm, the turbine
speed is maximised. For a sig-
nificant increase in boost pres-
sure, excellent cylinder charging
plus greater power and torque.
Electronic engine management.
Cultured performance in all
driving scenarios requires com-
prehensive engine control. The
electronic engine management
system does this by continually
monitoring the relevant input data
from a variet y of sophisticated
sensors. This data is then com-
pared with a corresponding set of
reference values. Based on this
information, a range of key engine
functions, e.g. ignition and in-
jection timings as well as injection
quantities, are seamlessly and
automatically adjusted. Other
major functions include on -board
recuperation. It ensures that the
on -board power supply is only
replenished while the vehicle is
on the overrun. This boosts fuel
economy as well as performance,
and ensures maximum engine
output during acceleration. All
this goes unnoticed by the driver,
apart from the obvious benefits:
lower fuel consumption and CO
2
emissions plus greater power and
torque at all times.
Exhaust system.
The light weight exhaust systems
in the Cayenne models are made
from special, long-life stainless
steel. The key features of the cata-
lysts are high ef ficiency, faster
warm -up and a long service life.
Sports exhaust system.
Available as an option on the
Cayenne and Cayenne S, the
sports exhaust system
1) provides
an even more distinctive sound.
For the looks to match, it comes
with a specially designed set
of t win dual-tube tailpipes with
a high-gloss finish.
All exhaust systems, standard and
sports, comply with the stringent
EU5 emissions legislation.
2)
Turbocharging system in the
Cayenne Turbo.
In the Cayenne Turbo, the engine
is assisted by t win turbocharger
units arranged in parallel –
one for each bank of cylinders.
Incoming air is passed through
a filter and compressed by the
turbine units. Its temperature is
then reduced in the t win inter-
cooler system, which improves
cylinder charging and limits
thermal loads on the engine.
Supercharging system in the
Cayenne S Hybrid.
The engine in the Cayenne S
Hybrid is equipped with a
supercharger. For a more direct
Air intake system.
The Cayenne models are all
equipped with a resonance air
intake system. This technology
uses the pressure waves
generated by the inlet valves
to ‘force’ air into the engine.
The ef fect is enhanced in the
Cayenne and Cayenne S by a
t wo -stage intake manifold. This
variable geometry 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).
The result: highly impressive
torque ratings across the entire
engine speed range.
1 ) For Cayenne only in conjunction with Tiptronic S.2) The data presented here was recorded using the Euro 5 test procedure (715/2007/ EC and 692/2008/ EC) and the NEDC (New European Driving Cycle). The respective figures were not recorded on individual vehicles and do not constitute part of the of fer. This data is provided solely for the purposes of comparison bet ween the respective models. For more information on individual models, please contact your Porsche Centre.
Tailpipes on the Cayenne, Cayenne Diesel, Cayenne S and Cayenne S Hybrid
Tailpipes on the Cayenne Turbo
Drive systems and chassis | Engine technology · 41
Spor ts exhaust system (optional)

The sensors are used to measure
a range of values, including the
rotational speed of all four wheels,
the lateral and longitudinal
acceleration of the car, and
the current steering angle.
If, for example, the rear wheels
threaten to lose traction under
acceleration, a greater proportion
of drive torque is automatically
transmit ted to the front axle by a more positive engagement of
the multi-plate clutch. In addition,
ASR minimises wheel spin. During
cornering, the required level of
engine torque is distributed to the
front wheels to ensure excellent
lateral stabilit y.
In conjunction with advanced
Porsche Stabilit y Management
(PSM, p. 66), PTM ensures the
perfect distribution of drive
torque for optimum traction in all road scenarios, whether on
long straights, through tight cor-
ners or on surfaces with dif ferent
friction coef ficients. If one of the
wheels is about to lose traction,
PTM uses the ABD function to
apply the corresponding brake.
As a result, more drive is auto -
matically transferred to the op-
posite wheel. If both wheels on
one axle are in danger of slipping,
ASR immediately intervenes
and modifies engine output to maintain drive. As well as en-
hancing traction and active safety,
Porsche Traction Management
(PTM) of fers exceptional handling
and driving dynamics.
Standard on the Cayenne,
Cayenne S and Cayenne Turbo.
Torque is distributed bet ween the
front and rear axles by means of
the electronically variable multi-
plate clutch. For the toughest
off-road terrain, the differential
can be locked using the PTM
control on the centre console.
With the aid of on -board sensors,
the status of the car is continu-
ously monitored and the front /
rear split is adjusted to match
changing driving conditions.
Porsche Traction Management
(PTM) on the Cayenne,
Cayenne S and Cayenne Turbo.
Porsche Traction Management
(PTM) is an active all-wheel drive
system with an electronically
variable, map - controlled multi -
plate clutch, automatic brake
dif ferential (ABD) and anti-slip
regulation (ASR).
Intelligent, discreet, responsive.
The ideal travelling companion.
All -wheel drive on the Cayenne, Cayenne S and Cayenne Turbo
Drive systems and chassis | Transmission · 45

Making headway without getting in a spin.
An approach we thoroughly support.
Chassis.
outside rear wheel which supports
the steering motion of the car,
thereby improving its cornering
dynamics.
At slow and medium speeds, PT V
Plus considerably enhances agilit y
and steering precision. At high
speeds, during fast cornering and
under wheel spin, the electron-
ically controlled
rear differential
ensures additional stabilit y. Also
on variable-grip surfaces, in the
wet and on snow, PT V Plus –
combined with Porsche Traction
Management (PTM) and Porsche
Stabilit y Management (PSM) –
provides a major contribution to
active safety.In of f-road terrain, PT V Plus
reduces wheel spin on the rear
wheels – even when towing heav y
trailer loads. The electronically
controlled rear dif ferential can
be fully locked using the of f-road
control on the centre console.
Optional for the Cayenne,
Cayenne S and Cayenne Turbo.
Porsche Active Suspension
Management (PASM).
PASM is an electronic damping
control system. It of fers con-
tinuous adjustment of individual
damping forces based on current
road conditions and driving st yle.
During performance driving or
heav y of f-road use, there is an
increased tendency for the body
to sway. PASM prevents this from
happening, thereby improving
stabilit y and occupant comfort.
PASM has three setup modes:
‘Comfort ’, ‘Normal’ and ‘Sport ’. Whichever one you select, the
system uses a series of sensors
to monitor the movement of the
body. It also gathers data on
lateral acceleration, steering
angle, brake pressure and engine
torque and modifies the damping
force on each individual wheel
in accordance with the selected
mode.
PASM remains active at all times.
It automatically adapts to the
prevailing driving conditions,
enabling greater car control and
improving comfort and safet y.
Optional for the Cayenne,
Cayenne Diesel, Cayenne S
and Cayenne S Hybrid.
Standard on the Cayenne
Turbo: air suspension with
PASM.
yaw velocit y and vehicle speed,
PT V Plus optimises steering re-
sponse and precision by applying
brake pressure to the left or
right rear wheel, as required.
Specifically, this means that when
entering a corner at high speed,
moderate brake pressure is
applied to the inside rear wheel.
This transfers drive torque to the
Porsche Torque Vectoring Plus
(PTV Plus).
A system for enhancing driving
dynamics and stabilit y, PT V Plus
of fers variable distribution of
engine torque to the rear
wheels
and electronically con trolled
rear differential. Depending
on the steering angle, steering
speed, throt tle pedal position,
Porsche Active Suspension Management (PASM)
50 · Drive systems and chassis | ChassisDrive systems and chassis | Chassis · 51
Porsche Torque Vectoring Plus (PT V Plus)

All Cayenne models have internal-
ly vented discs all round, ensuring
consistent performance during
heav y use. The front disc dimen-
sions (diameter/thickness) are
350 mm/34 mm on the Cayenne
and Cayenne Diesel, 360 mm/
36 mm on the Cayenne S and
Cayenne S Hybrid, and 390 mm/
38 mm on the Cayenne Turbo.All models have six-piston
monobloc aluminium brake
calipers at the front and four-
piston equivalents at the rear.
The calipers are black on the
Cayenne and Cayenne Diesel
and silver on the Cayenne S
and Cayenne S Hybrid. On the
Cayenne Turbo, they feature a
striking red paint finish.
Braking is assisted by a tandem
booster and large brake master
cylinder. Further assistance is
provided by PSM (p. 66).
For greater safet y, the brake pads
are equipped with individual wear
sensors, alerting the driver when
new pads are required.
Electric parking brake.
Manually activated and deactivat-
ed, the electric parking brake
releases automatically as you drive
off.
Automatic hold function.
With the automatic hold function,
you can pull away on the flat or a
slope without ever rolling back.
The system automatically detects
when the vehicle has come to a
halt on an uphill gradient. PSM then
maintains the brake pressure at all
four wheels for a brief period to
prevent the vehicle from moving in
the opposite direction.
Braking systems.
Porsche brakes are renowned
worldwide as the benchmark
in performance and durabilit y.
Equipped with larger and more
powerful braking systems, the
Cayenne models continue this
tradition by offering excellent
deceleration – even when the
car is fully laden with five adult
occupants, a full complement
of luggage and a braked trailer
load of up to 3,500 kg (Cayenne
with manual gearbox: 2,700 kg).
Outstanding brake performance.
To the point.
Standard braking system
(Cayenne/Cayenne Diesel) Standard braking system
(Cayenne S/Cayenne S Hybrid) Standard braking system (Cayenne Turbo)
Safety and environment | Safet y · 63
62 · Safety and environment | Safet y

PSM has three additional func-
tions that help reduce braking
distances. If the throt tle pedal
is released suddenly, PSM
automatically readies the braking
system. The pressure in the
brake lines is marginally increased,
bringing each of the pads into
light contact with the correspond-
ing disc. If the driver goes on
to apply the brakes, the calipers
respond more quickly and the
braking distance is reduced. In an emergency stop – i.e. when
the pressure on the brake pedal
exceeds a certain threshold –
the brake assist function uses the
PSM hydraulics to apply maximum
braking force at all four wheels.
For added safet y, the system
also readies the brakes whenever
a decreasing distance to the
vehicle in front is detected. The
optional adaptive cruise control
and PSM interact to prefill the
brakes.
Even if adaptive cruise control is
inactive, the system registers the
speed of the vehicle in front and
automatically readies the braking
system. In addition, the system
alerts the driver to the decreasing distance by briefly tugging on
the brakes.
PSM also features a trailer
stabilisation function – for a
significant contribution to car
and trailer safet y.
Within the laws of physics, it
compensates for load transfer
caused by throt tle and brake
inputs up to the maximum degree
of lateral acceleration. It also en-
hances the car’s driving dynamics
and directional stabilit y when
accelerating on inconsistent road
surfaces.
Other features include a special
control strategy in the ABS
for braking on loose surfaces.
By briefly locking the wheels, a wedge is formed ahead of each
t yre which provides additional
purchase to help slow the car,
e.g. on gravel or snow.
For a more involving driving
experience, PSM can also be
disabled, but remains active in
the background.
Standard on all Cayenne
models.
accele ration of the car. Using
this information, it is possible to
calculate the actual direction of
travel at any given moment. If
the car begins to oversteer or
understeer, PSM applies selective
braking on individual wheels to
restore stabilit y. If necessar y,
PSM can also intervene in the
engine management system to
temporarily modif y the amount of
drive transmit ted to the wheels.
Porsche Stability Management
(PSM).
Porsche Stabilit y Management
(PSM) is an electronic control
system that uses a range of
functions – including anti-lock
braking (ABS) – to help stabilise
the vehicle (and trailer, if fit ted)
in hazardous road scenarios.
Throughout each journey, sensors
monitor the direction, speed,
yaw velocit y and lateral
Preparing for the road ahead.
With a little help from PSM.
Safety and environment | Safet y · 67

curtain-t ype airbags on each
side of the roof offering opti-
mum head protection for both
rows of seats and side impact
protection elements in each
door. Side airbags at the rear
are also available as an option.Two impact sensors are located
at the front of the car to enable
bet ter detection of a head-on
collision. The driver and front
passenger airbags use a gas
generant based on an organic
propellant. As a result, the air-
bags are lighter, more compact
and easier to recycle. A roll-over
detection system provides
additional protection in the event
that the car were to overturn.
Using sensor-acquired data, it
enables early deployment of
the curtain airbags and triggers
the seat-belt pre-tensioners.
Seat belt system.
The Cayenne models feature
three-point seat belts on all
five seats, as well as seat-belt
pre-tensioners (front and outer
rear seats) and force limiters
(front seats only).
ISOFIX mounting points.
The outer rear seats are equipped
with ISOFIX mounting points for
compatible child seats (p. 84) as
standard. These are available as
an option for the front passenger
seat.
Airbags.
All Cayenne models are equipped
with full-size front airbags for
driver and front passenger as
standard. These are augmented
by Porsche Side Impact Protec-
tion (POSIP). This comprises
a side airbag in each front seat,
Bodyshell construction.
Our ongoing development of
the light weight steel body is a
decisive factor in the enhanced
passive safet y and unparalleled
rigidit y of the Cayenne body.
In the event of an accident, a
system of side and cross-
members at the front of the car
helps to channel impact energy
in a safe and predetermined
manner. The interior is protected
by hot-formed super high-strength
steel reinforcements, including
side intrusion beams in each of
the doors.
High strength and consistent
deformation properties: t wo
key safet y requirements fulfilled
by the multiphase steel used
throughout the body. Thanks to
a safet y cage structure made
from high -tech steels, the highly
resilient passenger cell of fers
high levels of protection.
Placing great weight on safety.
While taking things lightly.
Passive safety.
Passive safet y: airbags
Safety and environment | Safet y · 69
68 · Safety and environment | Safet y Passive safety: bodyshell
Multi-phase steels
Boron-alloyed steels
Plastic
Aluminium
Deep-drawn steels
High -strength micro -alloyed steels

has a separate control system
which the engine management
system uses to establish the
optimum amount of fuel – for
effective emissions control.
The exhaust-gas recirculation on
the Cayenne Diesel routes part
of the exhaust gas back into the
combustion process, resulting
in lower peak combustion tempera -
ture
and therefore lower nitrogen
oxide emissions. An oxidation
catalyst also forms an integral part of the process along with
a diesel particulate filter. This
ensures that the Cayenne Diesel
meets the EU5 emissions
s t a n d a r d .
Fuel and fuel economy.
Increasing performance while
enhancing fuel economy. The
Cayenne comes in a choice
of three dif ferent drive systems,
each featuring state- of-the-art
technology for high ef ficiency and
relatively low fuel consumption.
The petrol-engined models
already operate on fuels with an
ethanol content of up to 10 %. The diesel engine is compatible
with a biodiesel blend of max. 7 %.
This further improves the carbon
dioxide balance since the plants
grown for the production of
biofuels absorb carbon dioxide
from the atmosphere. As you
can see, for the benefit of the
environment, we are continually
working on making our cars more
ef ficient – as well as compatible
with alternative fuels. While
ensuring that they remain one
thing: a thoroughbred Porsche.
Fuel system.
We have also applied the highest
standards in order to protect
the environment from fuel
evaporation. The non-return
fuel supply system provides a
considerable reduction in vapour
emissions. The lines carrying
vapour are made from multi-layer
plastics. A large active- carbon
filter and multi-layer plastic fuel
tank help reduce evaporation still
f u rt h e r.
Standard on the Cayenne,
Cayenne S, Cayenne S Hybrid
and Cayenne Turbo.
advanced drive concepts –
from petrol and diesel engines
to our parallel full hybrid drive.
This is further aided by the rapid
warm -up cycle of the cataly tic
converters. The optimum operat-
ing temperature is reached earlier
so emissions are reduced sooner
when starting from cold.
On the petrol- engined and hybrid
models, another important feature
is the use of t win oxygen -sensor
circuits. Each bank of cylinders
Exhaust emissions.
The Cayenne models are all
equipped with the latest emis-
sions technology. As a result,
they comply with the stringent
European exhaust emissions
standard, EU5.
Whatever the class, every Porsche
combines high performance
with comparatively moderate
emissions. On the Cayenne
models, this is achieved using
Porsche engines.
Performing for today – and the future.
Safety and environment | Environment · 73

for the rear cabin area, with sep-
arate temperature controls for lef t
and right. The rear climate control
set tings can also be adjusted
from the front seats.Optional for the Cayenne,
Cayenne Diesel, Cayenne S
and Cayenne Turbo.
Water-repellent side windows.
The front side windows on the
Cayenne models have a water-
repellent finish that automatically
disperses moisture and dirt.
The result: optimum visibilit y,
even in poor weather conditions.
(Note: surface finish may require
occasional renewal.)
Privacy glass.
Available as an option, dark-tinted
glass provides privacy for the
rear seat and luggage area.Optional for all Cayenne
models.
Heated windscreen.
For added comfort and practi-
calit y, the heated windscreen
ensures optimum visibilit y on
cold days.Optional for all Cayenne
models.
Heat and noise-insulating glass.
All Cayenne models are equipped
as standard with heat-insulating
tinted glass featuring a grey top
tint on the windscreen. As an
optional alternative, heat and
noise-insulating laminated glass
of fers additional protection
against infrared radiation. Enjoy
peace and quiet, and an even
more pleasant climate, in the
passenger compartment.
The heat and noise-insulating
glass option also includes privacy
glass at the rear.Optional for all Cayenne
models.
sensor. Other features include
an active carbon filter,
which
excludes dust, pollen and external
odours.
Four-zone climate control.
Four-zone climate control pro -
vides independent air conditioning
Climate control.
All Cayenne models are equipped
with climate control as standard.
This system provides independent
control of the temperature and air
flow volume for driver and front
passenger as well as an auto -
matic air recirculation function
with an air qualit y and
humidity
As a child, you went out whatever the weather.
Nothing has changed.
Cayenne S Hybrid with privacy glass
Four-zone climate control for rear seat area
Comfort and transport | Comfort
· 97
96 · Comfort and transport | Comfor t