Porsche CAYENNE Brochure page 24

Controlling fuel delivery for optimum combustion.
Direct fuel injection (DFI).
All four Cayenne engines feature designed to improve power, torque
direct fuel injection. and emissions. The swirling of the
injected fuel creates a homogenous
As the name suggests, fuel is air/fuel mix, thereby enhancing
injected directly into each combustion.
combustion chamber using electro-
magnetic injectors offering At engine speeds up to 3,500 rpm,
extremely high precision in a double injection process is used.
terms of both timing and volume. Here, the required fuel volume
A high-pressure pump provides is delivered in two successive
the necessary pressure of up to injections per working stroke. The
120 bar. results are faster catalyst warm-up
and increased torque in the upper
The injector position and spray load range.
geometry have been carefully
By mixing the fuel and air directly
in the combustion chamber, DFI
contributes to engine cooling.
As a result, it was possible
to increase the compression
ratio and therefore output and
efficiency.
The engine management system
regulates the injection process
based on changing output require-
ments. Oxygen sensor circuits
are used to monitor emissions
and minimize impact on the
environment (see page 60). This
also reduces ownership costs.
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From road to racetrack. At the push of a button.
'Sport' button.
'Sport' button on centre console
All Cayenne models have a map for the electronic throttle.
standard 'Sport' function with The pedal response is quicker
a choice of comfort-oriented and the engine more dynamic
('Normal') or high-performance and direct. On vehicles with
('Sport') setup. Tiptronic S, upshifts are performed
later, downshifts earlier. The
When 'Sport' mode is enabled chassis control systems PASM
using a button on the centre and PDCC (if present) are also
console, the engine management set to 'Sport' mode. Cars with
system selects a more 'aggressive' air suspension are lowered to
Throttle response
in 'Sport' mode
Throttle response
in 'Normal' mode
Both sets of characteristics
are dependent on engine
speed.
Pedal travel (%)
Comparison of electronic throttle map in 'Normal' and 'Sport' mode
Low Level I, creating a firmer
ride, more positive turn-in and
better contact with the road.
The 'Sport' sound mode on the
sports exhaust system (standard
on Cayenne GTS; optional on
Cayenne S with Tiptronic S) is
also enabled when 'Sport' mode
is selected.
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Drive