Fuel, Exhaust & Engine Electrics
Page 2.1
2 - Fuel & Ignition
General
The main focus here is on new developments and modifications
compared to previous Cayenne models.
Direct Fuel Injection (DFI)
A totally redesigned generation of engines with DFI is used for the new
Cayenne models: a 3.6 l V6 engine for the Cayenne, a 4.8 l V8 naturally
aspirated engine for the Cayenne S and a 4.8 l V8 bi-turbo engine for
the Cayenne Turbo.
Development objectives for the new DFI engines:
• More power and torque.
• Reduced fuel consumption.
• Reduced weight.
These objectives have been achieved thanks to the following
enhancements and new technologies:
• Increased displacement for more power and torque.
• Use of direct fuel injection (DFI).
• Higher compression ratio.
• Sport button as standard.
• VarioCam Plus (for V8 engines).
• Demand-controlled oil pump (for V8 engines).
• New intake systems adapted specifically for each engine.
• VarioCam Plus (for V8 engines) for controlling the intake camshaft and
valve lift.
• New sports exhaust system (optional for Cayenne S with Tiptronic S).
• Demand controlled variable oil pump for improved engine efficiency
(for V8 engines).
Contents
General . . . . . . . . . . . . . . . . . . . . . . . . .1
Cayenne direct fuel injection (DFI) . . . . . .1
Cayenne V6 DFI engine . . . . . . . . . . . . . .5
Cayenne V8 DFI engines . . . . . . . . . . . . .8
Cayenne S DFI engine . . . . . . . . . . . . . .9
Cayenne Turbo DFI engine . . . . . . . . . . .9
Fuel supply . . . . . . . . . . . . . . . . . . . . .10
Ignition system . . . . . . . . . . . . . . . . . .22
V6 DFI engine . . . . . . . . . . . . . . . . . . .22
V8 DFI engines . . . . . . . . . . . . . . . . . .23
Intake air side, air routing . . . . . . . . . . .25
Exhaust system, emission control . . . . .31
Other functions of the DME control unit .36
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