2011 PORSCHE CAYENNE cooling

part-throt tle mode and through
energy recovery during braking.
A special bat tery management
and cooling system maintains
a constant temperature and
pro
tects the bat ter y from over-
heating. It also monitors the
charge/discharge processes. As
a result, the life of the bat tery is
optimised and its suitabilit y for
everyday use ensured, while
offering a high capacit y: 1.7 kWh. Systems that are usually depen d-
ent on the output provided by
the combustion engine, such as
climate control, power steering
and brake assist , run solely
on electricit y on the Cayenne S
Hybrid. As they do not rely on
output from the engine, these
functions remain active when the
car is running in electric mode or
when it is ‘coasting’ or gliding
along with the engine turned of f.
In summary: despite its six-
cylinder powerplant, the
Cayenne S Hybrid offers per-
formance levels that are com-
parable with an eight-cylinder
unit – but with significantly lower
fuel consumption.
Also when it comes to hybrid
drives, we’ve taken a completely
new path. Hardly surprising really,
with a technology this convincing.
The compact bat tery is located
under the loadspace floor in the
luggage compartment. Weighing
80 kg, its dimensions are
426 mm x 925 mm x 286 mm.
The bat tery is designed to last
without the need for any main-
tenance. As the electric machine
also functions as a generator,
it can charge the bat tery under
certain conditions when
the combustion engine is in
The hybrid system features a
high -voltage nickel metal hydride
(NiMH) bat tery consisting of
240 cells. It provides the electric
machine with the energy required
for the vehicle to drive short
distances solely on electric
power.
Drive systems and chassis | Drive systems · 31
Energy management display in PCM: electric mode
100 50
0
300350400450500
550600650
0
30 60 90
120
150 180 210 240 270 300 330
150200250

Power (kW)
Torque (Nm)Torque (Nm)T
1500
7500
2000 25003000 3500400045005000 5500600065007000
1000
Revolutions per minute (rpm)
360 390 420
700
580 Nm
279 kW (380 hp)
Cayenne S Hybrid system (combined)
Cayenne S Hybrid combustion engine
Cayenne S Hybrid electric machine

Cayenne S engineCayenne Turbo engine
The Cayenne S has a naturally
aspirated 4.8-litre V8 engine
with direct fuel injection (DFI,
p. 38), VarioCam Plus (p. 37) and
a t wo -stage intake manifold.
The unit delivers 294 kW (400 hp)
at 6,500 rpm. Maximum torque
of 500 Nm is available bet ween
3,500 and 5,000 rpm.
Fit ted with eight-speed Tiptronic S
as standard, the car is capable
of accelerating from 0 to
100 km/ h (62 mph) in
5.9 seconds. Top speed is
258 km/ h (160 mph), while
fuel consumption has been
reduced by 23 %
1).The Cayenne Turbo is
powered by
a 4.8-litre t win -turbo V8 engine
featuring direct fuel injection (DFI,
p. 38), VarioCam Plus (p. 37) and
charge-air cooling. It generates
368 kW (500 hp) at 6,000 rpm.
Maximum torque of 700 Nm is
available bet ween 2,250 and
4,500 rpm. Maximum speed is
278 km/ h (173 mph), while
the sprint from 0 to
100 km/ h
(62 mph) takes just 4.7 seconds.
By introducing a range of meas-
ures, e.g. standard
fitment of the
eight-speed
Tiptronic S, we have
been able to make the car 23 %
more fuel efficient.
The engine of the Cayenne S. The engine of the Cayenne Turbo.
Cayenne S: 500 Nm bet ween 3,500 and 5,000 rpm, 294 kW (400 hp) at 6,500 rpm Cayenne Turbo: 700 Nm bet ween 2,250 and 4,500 rpm, 368 kW (500 hp) at 6,000 rpm
Drive systems and chassis | Drive systems · 35
34 · Drive systems and chassis | Drive systems
100
300350400450500
550600650
0
30 60 90
120
150 180 210 240 270 300
3301500
7500
2000 25003000 3500400045005000 5500600065007000
150200250
1000

Power (kW)
Torque (Nm)Torque (Nm)T
Revolutions per minute (rpm)

360700

390750800420
294 kW (400 hp)
500 Nm
100
300350400450500
550600650
0
30 60 90
120
150 180 210 240 270 300
3301500
7500
2000 25003000 3500400045005000 5500600065007000
150200250
1000

Power (kW)
Torque (Nm)Torque (Nm)T
Revolutions per minute (rpm)

360700

390750800420
700 Nm368 kW (500 hp)
1) Compared to previous model (Model Year 2011).

consistently within a specific
temperature range. The engines
in the Cayenne models are
therefore designed for ef ficient
cooling.
In order to reduce the frictional
losses that occur during warm -up,
all Cayenne models feature com-
prehensive thermal management.
Using intelligent control, it
activates the dif ferent cooling
circuits individually and on de-
mand, thereby ensuring that the
optimum operating temperature
for the engine and transmission
is reached more quickly. This
minimises friction – and keeps
fuel consumption and CO
2 emis-
sions low.
The V8 engines have an enhanced
coolant management system
offering effective temperature
control throughout the engine.
While 20 % of coolant flows longi-
tudinally through the crankcase,
the remaining 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 within the main
lubrication system.
The entire cooling system is
designed for prolonged heav y-
dut y use, e.g. of f-road driving
or heav y towing and carrying
applications.Lubrication.
The V8 engines use dry-sump
lubrication to ensure a consistent
supply of oil in all load conditions,
especially in of f-road terrain.
The oil reservoir is located inside
the engine. This saves on space
and reduces weight.
Oil is circulated around the V8
engines using a demand- driven
pump. This has been designed
for the toughest driving scenarios
on and off road, including per-
formance driving and extreme
gradients. The V6 engines have a wet-sump
lubrication system.
Ensuring a
reliable supply of oil, no mat ter
how challenging the driving
conditions.
Direct fuel injection on the
diesel engine (common-rail
injection system).
On the Cayenne Diesel, direct
fuel injection comes courtesy of
a common -rail injection system.
The injection pressure is now up
to 2,000 bar, ensuring optimum
distribution of the air/fuel mixture
– for greater performance. The
piezoelectric injectors provide
flexible injection rate
adjustment,
using exactly metered quantities
of fuel, with multiple injections
for each power stroke to deliver
smooth combustion.
Cooling systems.
A high -performance engine can
only maintain its maximum
capabilit y over a long service life
if all components are operating
Direct fuel injection (DFI).
DFI injects fuel directly into the
combustion chamber at up to
120 bar with millisecond precision
using electromagnetic injectors.
The injector position and spray
geometry have been carefully
designed to improve output,
torque, fuel economy and emis-
sions. The swirling of the fuel as
it enters each chamber increases
the mixing of air and fuel, thereby
enhancing combustion. By form-
ing the air/fuel mixture directly
in the combustion chamber, DFI
contributes to engine cooling.
As a result, it was possible to in-
crease the compression ratio and
therefore power and efficiency.

Compression with precision.
Essential for getting right to the point.
38 · Drive systems and chassis | Engine technology

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)

Index
Index · 141
140 · Index
Drive systems 28
‘Coasting’ 23
Electric machine 28
Hybrid module 28
Parallel full hybrid 28
Performance 28

Engine technology 36
Air intake system 40
Auto start /stop function 36
Common-rail injection system 38
Cooling systems 38
Direct fuel injection (DFI) 38
Engine management
(electronic) 41
Exhaust system 41
Lubrication 39
Sports exhaust system 41
Supercharging system 40
Turbocharging systems 40
Variable Turbine Geometry
(V TG) 40
Variable valve timing 37
VarioCam Plus 37
Transmission 42
All-wheel drive 44
Anti-slip regulation (ASR) 44
Automatic brake dif ferential
(ABD) 44
Downhill assistance 47
Manual gearbox 42
Porsche Traction Management
(PTM) 44
Tiptronic S 42
Off-road capability 48
Chassis
50
Air suspension 52
Porsche Active Suspension
Management (PASM) 51
Porsche Dynamic Chassis
Control (PDCC) 53
Porsche Torque Vectoring Plus
(PT V Plus) 50
Self-levelling 52
Servotronic 55
Steering 55
Tyre Pressure Monitoring
( T PM) 57
Weight reduction 54
Wheels 56
Safety 58
Airbags 68
Automatic headlight
activation 60
Automatic hold function 63
Braking systems 62
Ceramic brakes 64
Cornering lights 61
Day time running lights 61
Headlights 60
Interior safet y features 68
Lighting 60
Parking brake (electric) 63
Porsche Ceramic Composite
Brake (PCCB) 64
Porsche Dynamic Light
System (PDLS) 61
Porsche Side Impact Protection
(POSIP) 68
Porsche Stabilit y Management
(PSM) 66
Recuperation 64
Seat belt system 69
Taillights 61
Environment 70
Exhaust emissions 72
Fuel economy 73
Fuel system 73
Ignition system 74Lightweight construction 70
Materials
75
Recycling 75
S e r v i c i n g 74

Comfor t 78
Anti-theft protection 99
Audio systems 88, 92, 94
Bluetooth
® 90
BOSE
® Surround Sound
System 92
Burmester
® High - End
Surround Sound System 94
CD/ DVD autochanger 88
Child seats 84
Climate control 96
Comfort memory package 82
Compass display 79
Driver memory package 82
Heat and noise-insulating
glass 97
Heated windscreen 97
Electronic logbook 90
Interior 79
Interior lighting 86
Mobile phone preparation 90
MP3 89, 91
Multifunction
steering wheel 79, 91
Navigation system 88
On-board computer 79 Panoramic roof system 100
Porsche Communication
Management (PCM) 88
Porsche Entry & Drive 98
Porsche Rear Seat
Entertainment
87
Porsche Vehicle Tracking
System (PV TS) 99
Privacy glass 97
Radio 88
Rain sensor 98
Seats 82
Storage compartments 86
S u n r o o f 10 0
Sunscreen 98
Telephone module 90
Touchscreen 88
T V tuner 91
Universal audio interface 91
USB port 91
Voice control 90
Water-repellent side windows 97

Driver assistance systems 102
Adaptive cruise control 104
Automatically dimming
mirrors 103
Comfort lighting package 102
Cruise control 103
Lane Change Assist (LCA) 105
P a r k A s s i s t 10 2
Reversing camera 102

Tr an s p o r t 10 6
Loading options 107
Loadspace management
s y s t e m 10 8
Luggage compartment 106
Ride-height control 106
Roof transport system 108
Tailgate (automatic) 106
Towbar systems 109
Personalisation 110
C o l o u r s 112
Exterior 112, 120
Interior 116, 124
Factory collection 129
Technical data 134