Monday, August 6, 2007

The Porsche 959, part 3

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Porsche also developed the 959's aerodynamics which were designed to increase stability, as was the automatic ride height adjustment that became available on the street car (961 race cars had fixed suspensions).
Its "zero lift" dynamics were a big part of keeping it drivable.
The 959 also featured Porsche-Steuer Kupplung (PSK) which, at the time, was the most advanced all wheel drive system ever used in a production car. Capable of dynamically changing the torque distribution between the rear and front wheels in both normal conditions and slip conditions, the PSK system allowed the 959 to have the adaptability it needed both as a race car and as a "super" street car.
Under hard acceleration, PSK could send as much as 80% of available power to the rear wheels, helping make the most of the rear-traction bias that occurs during such instances.
It could also vary the power bias depending on road surface and grip changes, helping maintain sure footedness at all times.
The magnesium alloy wheels were unique, being hollow inside to form a sealed chamber contiguous with the tire and equipped with a built-in tire pressure monitoring system.

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