2010 PORSCHE CAYENNE cooling

in part­throt 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
dent on the output provided by

the combustion engine, such as
climate control, power steering
and brake assist, run solely on
electricit y on the new 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 new
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

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 | Engines · 31
Energy management display in PCM: electric mode
100
50
0
300 350
400
450
500 550 600
650
0
30 60 90
120
150 180 210 240 270
300
330
150 200
250
Power (kW)

Torque (Nm)
1500
7500
2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
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

consistently within a specific
temperature range. The engines
in the new Cayenne models are
therefore designed for optimum
cooling.
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. In addition,
thermal management ensures
that the optimum operating tem ­
perature for the engines is
reached more quickly. This keeps emissions and fuel consumption
low, even when starting from cold.
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 engine in the Cayenne has
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 of up
to 1,800 bar ensures optimum
distribution of the air/fuel mixture
– for greater performance. The
piezoelectric injection valves
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
low­temperature water cooling
system for cooling the charge air.
Variable Turbine Geometry in
the new Cayenne Diesel.
The turbocharger in the new
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 automatic
compensation for changes in fuel
qualit y and control of the variable ­
tract intake manifold. On the
new Cayenne Turbo, the engine management system also regu ­
lates the turbo boost pressure.
The results:
optimum fuel eco
n ­
omy and lower CO
2 emissions as
well as greater power and torque
at all times.
Exhaust system.
The light weight exhaust systems
in the new Cayenne models are
made from special, long ­life stain ­
less steel. The key features of
the catalysts are high ef ficiency,
faster warm ­up and a long service
life. The sports exhaust system
1)
available as an option on the
new Cayenne and new Cayenne S
provides an even more distinctive
sound. The package also includes
a specially designed set of t win
dual ­tube tailpipes. All exhaust
systems, standard and sports,
comply with the strict EU5 emis ­
sions legislation.
2)
Turbocharging system in the
new Cayenne Turbo.
In the new Cayenne Turbo, the
engine is assisted by t win turbo ­
charger 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
new Cayenne S Hybrid.
The engine in the new 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 new
Cayenne and new 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 ) Introduction planned for 09/2010. For new 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. Provisional data only. Of ficial data unavailable at the time of publication.
For more information on individual models and final data, 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

Index
A
Adaptive cruise control 104
Air intake system 40
Air suspension 52
Airbags 68
All ­wheel drive 44
Anti ­slip regulation (ASR) 44
Anti ­theft protection 99
Audio systems 88, 92, 94
Auto start /stop function 36
Automatic headlight
activation 60
Automatic hold function 63
Automatically dimming
mirrors 103
B
Bluetooth® 90
BOSE
® Surround
Sound System 92
Brake differential (ABD) 44
Brakes 62
Burmester
® High ­End
Surround Sound System 94
C
CD/ DVD autochanger 88
Ceramic brakes 64
Chassis 50
Child seats 84
Climate control 96
‘Coasting’ 23
C o l o u r s 112
Comfort lighting package 102
Comfort memory package 82
Common ­rail injection
system 38
Compass display 79
Cooling systems 38
Cornering lights 61
Cruise control 103
D
Day time running lights 61
Direct fuel injection (DFI) 38
Downhill assistance
(Porsche Hill Control – PHC) 47
Driver memory package 82

E
Electric machine 23, 28
Electronic logbook 90
Engine management
(electronic) 41
Engines 28
Environment 70
Exhaust emissions 72
Exhaust system 41
E x t e r i o r 112 , 116
F
Factory collection 125
Fuel economy 73
Fuel system 73
H
Headlights 60
Heat and noise ­insulating
glass 97
Heated windscreen 97
Hybrid module 28
I
Ignition system 74
Interior 79, 114, 120
Interior lighting 86
Interior safet y features 68
L
Lane Change Assist (LCA) 105
Lighting 60
Lightweight construction 70
Loading options 107
Loadspace management
system 108
Lubrication 39
Luggage compartment 106
M
Manual gearbox 42
Materials 75
Mobile phone preparation 90
MP3 89, 91
Multifunction
steering wheel 79, 91

N
Navigation system 88
O
Off­road capabilit y 48
On ­board computer 79
P
Panoramic roof system 100
Parallel full hybrid 28
Park Assist 102
Parking brake (electric) 63
Performance 28
Personalisation 110
Porsche Active Suspension
Management (PASM) 51
Porsche Ceramic Composite
Brake (PCCB) 64
Porsche Communication
Management (PCM) 88
Porsche Dynamic Chassis
Control (PDCC) 53
Porsche Dynamic Light
System (PDLS) 61
Porsche Entry & Drive 98Porsche Rear Seat

Entertainment 87
Porsche Side Impact
Protection (POSIP) 68
Porsche Stabilit y
Management (PSM) 66
Porsche Torque Vectoring
Plus (PT V Plus) 50
Porsche Traction
Management (PTM) 44
Privacy glass 97

R
Radio 88
Rain sensor 98
Recuperation 64
Recycling 75
Reversing camera
1

02
Roof transport system 108

S
Safety 58
Seat belt system 69
Seats 82
Self ­levelling 52, 106
S e rv i c i n g 74
Servotronic 55
Sports exhaust system 41
Steering 55
Storage compartments 86
S u n r o o f 10 0
Sunscreen 98
Supercharging system 40

T
Tailgate (automatic) 106
Taillights 61
Technical data 130
Telephone module 90
Tiptronic S 42
Touchscreen 88
Towbar systems 109
Tra n s m i s si o n 42
Turbocharging systems 40
T V tuner 91
Tyre Pressure Monitoring
( T PM) 57
U
Universal audio interface 91
USB port 91
V
Variable Turbine Geometry
(V TG) 40
Variable valve timing 37
VarioCam Plus 37
Vehicle tracking system 99
Voice control 90
W
Water­repellent side
windows 97
Weight reduction 54
Wheels 56
Index · 137
136 · Index