The Porsche Cayenne | Part Four

The Porsche Cayenne 3.2 V6 Engine

Porsche Cayenne

New six-speed gearbox with innovative Porsche Drive-Off Assistant

The power of the new V6 is transmitted in standard form by a newly developed six-speed manual gearbox. This gearbox is combined with an innovative assistance system helping the driver set off on gradients. The Porsche Drive-Off Assistant (PDOA) holds the vehicle on a hill by automatically applying the brakes. Once the driver engages the clutch, the system releases the brakes and allows the driver to set off smoothly.

The Cayenne ia also available with Porsche’s six-speed Tiptronic S transmission as an option. Applying Porsche’s usual philosophy, this automatic transmission allows the driver to shift gears manually by means of paddles on the steering wheel. Another option is to shift gears by briefly flicking the selector lever forwards or backwards, particularly convenient when shifting gears on rough terrain.

Latest generation of four-wheel drive

The Cayenne comes with a number of technological highlights providing the ideal combination of supreme on-road and excellent off-road driving characteristics, features which made their world debut in the latest range of Porsche models. One example is Porsche’s intelligent Traction Management system (PTM), which provides a 38:62 split of engine power between the front and rear wheels under noraml conditions. As conditions change, however, up to 100 per cent of the engine torque can be channelled via a multiple-plate clutch to the front or rear wheels as required. In this process PTM does not just react to the available traction but instead uses sensors to measure the speed of the vehicle, its lateral acceleration, the steering angle and position of the throttle to provide better control when driving at the limit. A further feature standard on the Cayenne is Porsche Stability Management (PSM) which constantly interacts with PTM, intervening only when the vehicle is driven to the absolute limit.

Cayenne’s outstanding on-road performance is matched by equally superior off-road ability. On rough terrain, PTM is able to activate a low ratio reduction gear integrated into the power divider, as well as a 100 per cent front-to-rear wheel lock should individual wheels lose contact with the surface altogether.

Chassis and suspension both for the road and for rough terrain

The chassis of the Cayenne is designed to provide supreme driving dynamics with outstanding safety as well as exceptional off-road qualities. The front axle uses a substantial double track control arm configuration fixed to a rubber suspended subframe. With the track control arms being far apart, suspension forces are kept to a minimum. The rear axle is an elaborate multi-arm configuration able to handle both traction forces and any loads the Cayenne may be carrying with ease.

Long spring travel is highly desirable for off-road motoring. With a ground clearance of 217mm (8.54ins), approach and departure angles are 29.10 and 25.70. The ramp angle is 20.40, and the vehicle is able to cross water up to 50cm – almost 20ins – deep. As an option, the new Cayenne is available with the air suspension system found as standard on the Cayenne Turbo as well as the new Porsche Active Suspension Management (PASM) damping system.

continues... | Part Five
Published 2 June 2004 Melanie Carter

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