Cayenne S Dfi Engine; Piston Recess; Turbo Dfi Engine - Porsche Cayenne V6 2008 Service Information

Cayenne S DFI Engine

Fuel, Exhaust & Engine Electrics
On the new V8 naturally aspirated engine in the Cayenne S, the displace-
ment has been increased by 0.3 liters to 4.8 liters with a compression
ratio of 12.5. Engine power has been increased by 45 HP to 385 HP,
while the torque is now 370 ftlb. (500 Nm) – an increase of +59 ftlb.
(+80 Nm). Idling rpm is 580 rpm (550 rpm for AT with transmission
range engaged) and maximum engine rpm is 6700. The new DME con-
trol unit EMS SDI 4.1 has been specially adapted to suit direct fuel injec-
tion and the modified engine specifications of the V8 naturally aspirated
engine.
• DFI direct fuel injection.
• Intake system with variable intake manifold.
• Enhanced exhaust system.
• New sports exhaust system (optional, in conjunction with Tiptronic S).

Piston Recess

The piston recesses are specifically designed to suit the characteristics
of the V8 naturally aspirated engine during late injection with the high
pressure stratified charge ignition system and during the catalytic
converter heating phase.
The increase in the compression ratio from 11.5 to 12.5:1 on the V8
naturally aspirated engine as a result of DFI serves to optimize both
engine power and fuel consumption.
Cayenne Turbo DFI Engine
On the new Cayenne Turbo, displacement has also been increased by
0.3 liters to 4.8 liters with a compression ratio of 10.5. Engine power
has increased by 50 HP to 500 HP, while the torque is now 518 ftlb.
(700 Nm – an increase of +56 ftlb. (+80 Nm). Idling rpm is 580 rpm
(550 rpm for AT with transmission range engaged) and maximum engine
rpm is 6700. The new DME control unit EMS SDI 4.1 has been specially
adapted to suit direct fuel injection and the modified engine specifica-
tions of the V8 turbo engine.
• DFI direct fuel injection.
• New intake system.
• Adaptation of turbochargers and boost pressure control.
Piston Recess
The piston recesses are specially adapted to the characteristics of the
V8 turbo engine. The increase in the compression ratio from 9.5 to
10.5:1 as a result of DFI serves to optimize both engine power and fuel
consumption.
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