When the original Saleen S7 went on sale in 2002, it was the only US road-legal vehicle capable of producing over 500 bhp and 500 lb/ft of torque, and it has been recognised by several automotive magazines as the quickest production model in the world. Saleen, however, is not a marque content with basking in past glories, and in 2005, they upgraded their already exceptional S7, releasing the S7 Twin Turbo. The new version produces 750 bhp and 700 lb/ft of torque – numbers which make the competition look tame by comparison.
New for 2005
The most obvious change for 2005 was the introduction of the twin turbos which are responsible for the S7’s awesome power and torque. Some modifications were made to the aerodynamics, and close comparison of the 2002 and 2005 models will reveal the re-designed rear spoiler and diffuser, and re-shaped front fenders. The S7 chassis also underwent some significant changes to complement the extra power and acceleration capabilities. Almost all the suspension pickup points were changed and the 2005 suspension system eliminates some of the 2002 version’s squat and dive during heavy braking and acceleration.
Engineering
A Saleen design, the S7’s engine and drivetrain are the epitome of modern racetrack technology. The V8 engine sits in an all-aluminium cast, and is capable of displacing 7.0 litres, with a redline set at 6,500 rpm. High quality, futuristic materials feature throughout, including titanium retainers, valves and exhaust in stainless steel, aluminium throttle body and beryllium exhaust valve seats. The Saleen-designed Front Engine Accessory Drive (FEAD) setup allows for an exceptionally compact engine and optimised weight distribution. Weight distribution is further enhanced by the engine’s mid-chassis positioning, as is the S7’s centre of gravity.
Fuel is delivered to the extraordinary powerhouse by duel electric pumps and 52 lb/hr fuel injectors. The twin Saleen-Garrett turbos are neatly integrated into the S7’s stainless steel, dual flow exhaust system. Saleen’s commitment to emissions reduction is demonstrated by the presence of dual catalysts and heated oxygen sensors for each cylinder bank.
The 2005 Saleen S7 incorporates the brand’s high-performance racing pedigree in the construction of its suspension and chassis systems. The system is built upon a space frame chassis with honeycomb composite reinforcing. The S7’s body is made from aerospace-standard carbon fibre. The suspension features fully independent double wishbones of unequal length, front and rear anti roll bars and aluminium shock absorbers.
Design & styling
The S7 owes its body shape to the wind, having been designed on the basis of extensive wind tunnel testing, with low drag coefficient, optimal drag-to-lift ratio and maximum down force taken into consideration. The 2005 Twin Turbo version, with its redesigned front and rear diffusers and rear spoiler, boasts a 40% reduction in aerodynamic drag and a 60% boost in down force – a remarkable feat of engineering.
Inside, the surfaces are dressed with leather and suede. Features include air conditioning, power door locks, remote keyless entry, power windows and heated front windshield. The “rear-view mirror” is provided courtesy of an interior-mounted video camera.
© 2006 Martin Hemmings and Gary Tsang for www.sport-cars.org
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