Porsche Cayenne Transsyberia | Part Four

Porsche Cayenne

Porsche Cayenne on the Transsyberia Rally

Porsche Active Suspension Management and Dynamic Chassis Control

Particularly in heavy terrain, PDDC Porsche Dynamic Chassis Control - interacting with air suspension and PASM Porsche Active Suspension Management - enhances traction to an even higher standard. And should the driver activate the low-range mode on the six-speed automatic transmission by means of the control switch, PDCC will automatically switch over to the off-road mode, the system thus allowing maximum articulation of the axles.

In the Special Off-road Mode provided by the air suspension, the maximum depth when crossing rivers and streams, etc, is approximately 75cm. To make such an extreme depth possible, both the body and the doors are sealed off against the penetration of water all the way up to the side windows. And using a flexible air filter snorkel, the air intake has been moved up even further to the roof of the vehicle, ensuring that the bow wave typical when crossing water is not able to reach, let alone enter, the engine air intake manifold.

The wheels and suspension of the Cayenne have also been modified for the most extreme, long-term demands of rough tracks and rocky surfaces. As an example, the double-­arm front axle comes with reinforced track control arms, with the track itself increased by 34mm for extra stability.

The tyres are specific off-road examples measuring 255/55 R 18 T and homologated for speeds of up to 190 km/h or 118 mph. The tyres themselves are fitted on 18-inch, 15-spoke Cayenne S II light-alloy wheels and the rim hubs are finished in orange.

Massive Safety Cell within the Interior

It is recognised that the Porsche Cayenne ranks right at the top in its market segment in terms of body stiffness and passive safety – no surprise, considering that more than 60 per cent of the body-in-white is made of high-strength steel. To offer both the driver and passenger further protection from the consequences of a collision or roll-over under racing conditions, the Cayenne S Transsyberia comes with a safety cage bolted on to the passenger cell. Indeed, this cage even follows the rules and requirements of the FIA Motorsport Authority, with the driver also being protected by an air­bag for extra safety.

Optimised for Minimum Weight All Round

To off-set the extra weight of the safety cage and rally equipment, and to further lower the vehicle's centre of gravity, the rear seat bench, interior body panels and sound-proofing material have all been removed from the car. Central locking, in turn, is replaced by a manual door opening mechanism on the front doors. Both the rear window and the rear side windows are made of light polycarbonate, while the side windows at the front, as on all Cayenne models, feature special hydrophobic treat­ment at the outside to make water run off more quickly and smoothly, ensuring that the windows remain cleaner for longer than with conventional glass.

Published 6 August 2007 Melanie Carter

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