
Drive systems and chassis  |  Engine technology · 44 
43 · Drive systems and chassis  |   Engine technology
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 effect is further enhanced on the V6 
engine in the Cayenne and the V8 engine 
in the Cayenne S and the Cayenne GTS 
by a t wo -stage intake manifold. This vari -
able 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.
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 twin intercooler 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 response, even at low revs 
and road speeds. The supercharger has 
a low-temperature water cooling system 
for cooling the charge air.
Variable Turbine Geometry (VTG) 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 elec -
tronically 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 
significant increase in boost pressure, 
excellent cylinder charging plus greater 
power and torque.
Electronic engine management.
Cultured performance in all driving 
  scenarios requires comprehensive   
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 compared with 
a corresponding set of reference values. 
Based on this information, a range of   
key engine functions, e.g. ignition and 
  injection timings as well as injection 
quantities, are seamlessly and auto -
matically 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 max -
imum 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 catalysts are high efficiency, 
  faster warm-up and a long service life.
Sports exhaust system.
Available as an option on the Cayenne 
and Cayenne S and included as standard 
on the Cayenne GTS, the sports exhaust 
system
1) provides an even more distinct -
ive sound. For the looks to match, it 
comes with a specially designed set of 
t win dual-tube tailpipes with a high-gloss 
finish. On the Cayenne GTS, these are 
  finished in mat t black.
All exhaust systems, standard and 
sports, comply with the EU 5 emissions 
legislation.
1)   For Cayenne only in conjunction with Tiptronic S. Single-tube tailpipes on the Cayenne, Cayenne Diesel, 
Cayenne S and Cayenne S Hybrid
Dual-tube tailpipes on the Cayenne Turbo
Sports exhaust system (optional)
But ton for spor ts exhaust system
Spor ts exhaust system, with t win dual -tube tailpipes in mat t black on the Cayenne GTS For fuel consumption, CO2 emissions and efficiency class data, please refer to pages 150/151. 

Safety and environment  |  Environment  · 76 
75 · Safety and environment   |  Environment
Exhaust emissions.
The Cayenne models are all equipped 
with the latest emissions technology. As 
a result, they comply with the European 
exhaust emissions standard, EU 5.
Whatever the class, every Porsche 
  combines high performance with com -
paratively moderate emissions. On the 
Cayenne models, this is achieved using 
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 catalytic 
  converters. The optimum operating tem -
perature 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 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 com   bustion tem-
perature and therefore lower nitrogen 
oxide emissions. An oxidation catalyst 
also forms an integral part of the process 
along with a diesel particulate filter.
Porsche engines.
Performing for today – and the future.
Fuel and fuel economy.
Increasing performance while enhancing 
fuel economy. The Cayenne comes in a 
choice of three different drive systems, 
each featuring state-of-the-art technol -
ogy for high efficiency and relatively low 
fuel consumption. The petrol-engined 
models already operate on fuels with 
 
an ethanol content of up to 10  %. 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 environ
-
ment, we are continually working on 
making our cars more efficient – 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 stand -
ards to our petrol- engined models 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 further.
For fuel consumption, CO
2 emissions and efficiency class data, please refer to pages 
15 0/ 151. 

Safety and environment  |  Environment  · 78 
77 · Safety and environment   |  Environment
Noise.
As paradoxical as it may seem, the 
  distinctive Porsche sound is also created 
by what you don’t hear – the absence of 
unwanted noise. Naturally, its main origin 
is deep within the engine. But that ’s   
not all. Our holistic approach to vehicle 
design also extends to the acoustics. 
Which is why we’ve optimised them for 
the entire car.
To minimise ‘play’ between components, 
we’ve used stronger, lighter and more 
temperature-resistant materials. This 
  reduces mechanical noise. Large-volume 
silencers and air intake manifolds also 
help to eliminate noise – throughout the 
life of the car.
Tyre noise has been drastically reduced 
in collaboration with our official t yre 
  partners. Wind noise levels have also 
been lowered thanks to aerodynamic 
 refinements. All that remains is a sound that is pure 
Porsche.
Servicing. 
With lengthy service intervals and long-
life components, vehicle maintenance is 
kept to a minimum. In the case of the oil 
filter, for example, all that ’s replaced is 
an easily recyclable paper element. The 
oil filter casing remains on the car.
All moving parts inside the engine are 
fully self-adjusting. The valve clearances, 
for instance, feature automatic hydraulic 
control.
Thanks to single-spark coils on each of 
the cylinders, the entire ignition system 
on the petrol-engined models, with 
 
the exception of the spark plugs, is 
 maintenance-free.
These modest service requirements 
mean less waste disposal and fewer    demands on natural resources. They 
 
also lower the cost of ownership while 
keeping your car on the road. 
Service intervals for the Cayenne models 
are dependent on a range of factors, 
  including local fuel quality. For full details 
of service intervals in your country, please 
consult the relevant price list or contact 
your Porsche Centre.
Materials and recycling. 
Owning a Porsche should be a lasting 
pleasure with minimal impact on the 
  environment. This Porsche principle   
can be summed up in one word: sustain -
abilit y. The light weight exhaust on the 
Cayenne models, for example, is con -
structed from long-life stainless steel.
Every Porsche model is entirely free of 
CFCs and components manufactured 
using CFCs. All legal requirements in 
  respect of recoverability are fulfilled.   
Materials are clearly labelled for 
  subsequent identification and sorting 
 
to facilitate efficient recycling.
While more than 95  % of the car can be 
recycled using current technologies, the 
chances are your Cayenne may never 
need 
recycling at all. After all, t wo thirds 
of all the cars we have ever made are 
still on the road today.
For more information on environmental 
issues, please visit www.porsche.com