Series officials mandated a reduction in the size of the Corvettes» intake
air restrictors for this race, an adjustment that cut engine output by 35 horsepower.
After another reduction in the size of
the air restrictors for the 2009 season (as mandated by governing body of world motor sport), the engine now delivers around 450 bhp (331 kW) at 7,800 rpm, and develops a maximum torque of 430 Nm at 7,250 rpm.
Not exact matches
This increase in displacement coupled with the removal of a racing
air restrictor allowed
for 612 PS (450 kW; 604 hp) and torque to 775 N ⋅ m (572 lb ⋅ ft).
«Under the ACO regulations, running a full
air conditioning system allows us to run slightly larger intake
air restrictors to make up
for the power that's used to run the system,» he explained.
For the Corvette C7.Rs, we see a one (1) liter reduction in fuel capacity and an increase of 0.7 mm in the
air restrictors.
The specification
for the car was unique and featured an apparently more powerful «D spec» race engine (+75 bhp over the 2005 spec engine) with generous 34 mm
air restrictors.
The R8 Grand - Am features an engine with its power reduced from 470 PS (346 kW; 464 bhp) to 450 PS (331 kW; 444 bhp) via an
air restrictor and the engine electronics, a reduced fuel tank capacity of 83.3 litres, three - part rims
for wheels and suspension, and deactivated anti-lock system and traction control (NASCAR / Grand - Am does not permit either traction control nor anti-lock brakes).
As the pioneer in turbo technology, Porsche opted at the time
for a biturbo power unit displacing 3.16 litres and delivering maximum output of 474 hp despite its
air restrictor.
Only changes in the
air restrictor (38 mm), minimum weight (+85 kg) and ride height (+13 mm front / +10 mm rear) have been made to the Super Trofeo cars to be compliant
for PWC competition.
Both the previous - gen Aston Martin Vantage GTE and mid-engined Porsche 911 RSR have been given 0.6 mm reductions in
air restrictors, with a slight boost decrease
for the Ferrari.