Fuel, Exhaust & Engine Electrics
Page 2.8
Cayenne V8 DFI Engines
The totally redesigned family of V8 engines includes a naturally
aspirated engine for the new Cayenne S and a turbocharged version for
the new Cayenne Turbo. Specific design work and tuning has resulted in
an identical parts concept between the naturally aspirated and turbo
engine.
Key changes:
• Direct fuel injection (DFI).
• Engine control unit Siemens EMS SDI 4.1.
• Increased displacement.
• New cylinder head for DFI.
• Special recessed pistons for Cayenne S and Cayenne Turbo.
• Use of VarioCam Plus.
• Demand controlled variable oil pump.
Motronic Control Unit EMS SDI 4.1
A completely new DME control unit EMS SDI 4.1 developed by Siemens
is used for the V8 engines. This is designed specifically to meet the
requirements for using the direct fuel injection system and VarioCam
Plus. The control of fuel injectors, which are the main elements of the
direct fuel injection system, is particularly important here. The DME
control unit can be programmed for individual countries using the data
records for Cayenne S and Cayenne Turbo.
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