Porsche Cayenne Turbo S

A new, supreme top-of-the-range model is taking over the leading position within the Porsche Cayenne range; second only to the Carrera GT, the Cayenne Turbo S is the most powerful Porsche homologated for road use. Benefiting from careful improvement and on-going development of the turbocharger system, the eight-cylinder bi-turbo power unit develops maximum output of 383 kW (521 bhp) at 5500 rpm, 52 kW or 71 bhp more than the Cayenne Turbo. Maximum torque of 720 Newton-metres or 531 lb-ft, in turn, is maintained consistently all the way between 2,750 and 3,750 rpm. This impressive output is reflected by truly outstanding performance on the road. The Cayenne Turbo S accelerates to 100 km/h (62 mph) in 5.2 seconds, sprints from 80 - 120 km/h (50 - 75 mph) in fifth gear in 5.4 seconds, and has a top speed of 270 km/h or 167 mph.

Subtle external differences identify the new model; 20-inch SportTechno design alloy wheels, four exhaust tailpipes, the model designation at the rear and, if ordered by the customer, paintwork in Navy Blue Metallic, which is exclusive to this model. Under the bonnet, however, there are significant changes.

Upgraded turbocharger system

The 4.5-litre V8 engine featured in the Cayenne Turbo S remains unchanged in principle, modification of the two intercoolers serving to boost both engine output and torque to a new level of performance. Fitted between the turbochargers and the throttle butterfly, the intercoolers serve to cool the compressed air supplied to the engine, improving the cylinder charge in the process.

The heat exchangers fitted in front of the wheel arches, together with the air supply and discharge ducts, are now made completely of aluminium and are 13 millimetres or 0.51" larger than on the Cayenne Turbo, ensuring a much higher level of efficiency and, at the same time, a significant improvement of flow conditions in the radiator, with the loss of pressure loss down by more than 50 per cent.

Porsche development engineers have also used these positive effects to increase boost pressure, depending on the speed range, by up to 0.2 bar to a maximum of 1.9 bar, with engine output increasing further in the process. However, it is only the concurrent optimisation of engine efficiency that really confirms the supreme standard of engine management achieved by the new power unit, the Cayenne Turbo S not consuming any more fuel than the Cayenne Turbo in the same speed range.

continues... | Part Two

Published : 05/01/05 Author : Melanie Carter

Porsche Cayenne News

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