Design
The RS Spyder was designed completely in-house by Porsche engineers. The chassis is a rigid carbon fibre monocoque with both the engine and transmission being integral stressed members. The 3.4 litre 90-degree V8 racing engine was designed from scratch as was the six-speed electro-pneumatic sequential gearbox. Braking is via six-piston caliper carbon-fibre brake mounted on suspension controlled by four-way, spring/damper units activated by pushrods with adjustable torsion-bar springs. The car has a dry weight of 825 kilograms (1,820 lb) in 2010 specification but was initially 750 kilograms (1,700 lb).
Since its introduction in 2005 the engine, which initially produced 478 horsepower (356 kW) has been developed and modified to meet the changing regulations of both the ALMS and the ACO. For 2008 the engine developed 503 horsepower (375 kW) using direct fuel injection and 440 horsepower (330 kW) in 2009-spec with air restrictor limitations.
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