Intake Manifold Injection; Sport Button - Porsche Cayenne V6 2008 Service Information

Fuel, Exhaust & Engine Electrics
Page 2.4
Note!

Intake manifold injection

> With the intake manifold injection system, the fuel is injected into the
intake duct earlier and mixture formation takes place partly in the
intake duct and partly in the combustion chamber. During the intake
process, fuel is deposited on cylinder walls and valves and as a result,
this fuel is no longer available for combustion. This is particularly the
case during the start phase of the engine at low temperatures and the
consequence of this is that the amount of fuel used exceeds the
amount of fuel that is actually needed for combustion.

Sport Button

All new Cayenne models already have a Sport button as standard, which
is located centrally in the center console under the shift lever or
Tiptronic S gear selector. This button allows the driver to choose
between the vehicle's fuel consumption tuning (normal mode) and sport
tuning (sport mode). When the Sport button is pressed, a "SPORT" logo
lights up in the instrument cluster.
In the Motronic area, pressing the Sport button (in High-Range
mode only) affects the following systems, depending on the
vehicle equipment:
• When the Sport button is activated, a more sporty accelerator pedal
characteristic produces a more spontaneous engine response, under-
pinning the sporty character. This is achieved via a steeper rise for
the electronic throttle characteristic. This means that the throttle is
opened further and faster with the same accelerator pedal travel
when the Sport button is pressed.
• Maximum full-load torque is available at all times in the Sport button's
sport mode. In normal mode, electronic engine management restricts
the engine management functions in order to optimize fuel consump-
tion. If full power is required in a certain driving situation (e.g. when
passing), it can be achieved at any time by initiating a kick down.
Engine management switches to the sport mode map at this time.
• The Sport button lends a sportier feel to the transitions between trac-
tion and deceleration, as well as between deceleration and traction.
This means that throttle activation and ignition are switched to a more
direct map when accelerating and particularly when decelerating,
resulting in a more spontaneous and dynamic load cycle.
• The sports exhaust system available for the Cayenne S in
combination with Tiptronic S is also activated using the Sport button.
Sport mode remains active until either the Sport button is pressed a
second time or the driver switches off the ignition. This deactivates
sport mode and the settings revert to normal mode.