Originally Posted by
neil trama
Production cars are generally only allowed safety and very limited reliability modifications. Because of this they are a very true representation of the performance and reliability available on the showroom floor. That is why cars like the MPS perform well in the Australian Manufacturer's Championship. In the last 10 years, 4 cylinder cars have absolutely dominated. V8s are seriously under represented.
This is diametrically opposed to categories such as V8 Supercars and, say Sports Sedans where the race machines have no semblance of what is sold to the public.
Having said all that, we are allowed "blueprinting" where the engine builder (that's me) optimises all engine dimensions to produce a special engine that still conforms with the manufacturer's specifications but produces significantly more performance. For example our boost level must not exceed standard figures but our racing MPSs produce 198kW at the wheels. The engine dyno tuner (also me) is allowed to modify tuning paramenters, but not exceed the boost limit.
Neil