riff_raff wrote:Are you sure you mean they use a "locked diff"? Which is basically the same as a spool or no differential at all. The only types of racing I know of where the cars don't use a rear diff are oval track racing, sprint cars, and drag racing.
Engine and drivetrain
All cars must be front-engined and rear-wheel drive. All cars use a 5.0-litre, naturally aspirated V8-engine with electronic fuel injection, capable of producing between 460 and 485 kW (620–650 bhp). Manufacturers are free to choose between using an engine based on one from their own line up or a generic engine provided by V8 Supercars. Both Ford and Holden use US-based racing engines with pushrod actuated valves and two valves per cylinder. Mercedes, Nissan and Volvo use modified versions of their own engines, with hydraulic-lift valves and four valves per cylinder. All engines are electronically limited to 7,500 rpm and have a compression ratio of 10:1.
Power is transferred from the engine to the rear wheels through a six-speed sequential transaxle with an integrated spool differential
. The individual gear ratios and the final drive ratio are fixed with drop gears at the front of the transaxle allowing the teams to alter the overall transmission ratio for different circuits. The cars use a triple plate clutch. The cars run on E85 fuel with a fuel tank capacity of 112 litres.
An electronic control unit (ECU), provided by MoTeC, is used to monitor and optimise various aspects of the engine's performance. Numerous sensors in the car collect information which is then transmitted to the team, allowing them to monitor things such as tyre wear and fuel consumption and find potential problems with the car. The ECU is also used by officials during the scrutineering process.