The New Porsche Boxster | Part Four

The suspension with its new set-up gives the next generation Porsche Boxster models a combination of even greater driving dynamics and enhanced comfort all in one. Modification of the valve control map on the steering gear serves furthermore to reduce steering forces, giving the Boxster more agile and spontaneous steering behaviour.

The wheels come in new designs and are half an inch wider on the Porsche Boxster 2.9-litre model than in the past in order to accommodate the larger brake system of the S-models, which are now fitted on the front axle. The Porsche Boxster and Porsche Boxster S feature the latest generation Porsche Stability Management (PSM) now offering two new functions: Brake Pre-Loading and the Brake Assistant. Whenever the driver lifts off the throttle pedal very quickly - which is typical immediately prior to an emergency braking manoeuvre - the PSM hydraulic control unit builds up an appropriate level of pressure in the brakes before the driver even presses the pedal down, which has the effect of moving the brake pads slightly towards the discs for immediate action. This significantly improves brake response and shortens stopping distances accordingly.

When recognising that the driver is braking in an emergency due to very fast operation of the brake pedal and a defined brake force, the PSM hydraulic control unit actively delivers the brake pressure required for maximum stopping power.

In conjunction with 18- and 19-inch wheels, the new models in the Boxster range are also available with a limited-slip differential on the rear axle. Locking action is 22 per cent under power and 27 per cent in overrun. The result is a significant improvement of both traction and stability providing a substantially higher level of performance on winding roads, particularly on the race track. Yet a further advantage is the more stable load change behaviour. At the same time, the mechanical limited-slip differential, through its particular function, interacts perfectly with the electronic ABD Automatic Brake Differential for optimum traction control, the locking action delaying the tendency of one wheel to spin on a road surface slippery only on one side.

Published 19 November 2008 Staff

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