Four-Wheel Drive - Porsche 911 CARRERA - 2003 Manual

911 Carrera 4, 911 Carrera 4S
Four-Wheel Drive
With the four-wheel drive, the engine power is
variably distributed to the front and rear wheels.
Power distribution and wheel speed compensa-
tion between the front and rear axles is realised
with a viscous multiple-disc clutch.
Distribution of the engine power is dependent
upon the wheel speed difference between the
two axles.
The viscous multiple-disc clutch always delivers
sufficient drive power to the front wheels
(approx. 5% to
40%)
to ensure optimum traction
even on a poor road surface.
In combination with the Porsche Stability Man-
agement (PSMJ, four-wheel drive ensures opti-
mum handling and increased driving stability.
60
Controls, Instruments
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Warning!
The increased control that is provided
should not induce you to take greater risks
with your safety. The limits dictated by the
laws of physics cannot be overcome, even
with four-wheel drive.
The risk of accidents due to inappropriate
speed cannot be reduced, even by four-
wheel drive.
The driver bears the responsibility for all
driving maneuvers.
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Adapt your driving style to the prevailing road
and weather conditions.
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Obey all traffic laws.
Dynamometer testing procedure
Some U.S. states and Canadian provinces con-
duct emissions inspection/maintenance testing
involving the use of two-wheel dynamometer.
A two-wheeled dynamometer is a treadmill type
device upon which a single axle of the car, the
driving axle of the vehicle, rotates to simulate
vehicle operation on the road while the vehicle
remains stationary.
Your 911 Carrera 4 has a full-time four-wheel
drive system which cannot be disabled. Severe
damage to the powertrain can result if tested on
a two-wheel dynamometer.
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Warning!
To avoid severe powertrain damage and a
possible unexpected movement of the ve-
hicle.
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Your 911 Carrera 4 vehicle must never be
tested on a two-wheel dynamometer.
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Advise the emission station of this warning be-
fore testing the vehicle.
Power measurement
Power measurements on dynamometers are not
approved by Porsche.