The computer measures up ur car not from the type class but rather from ur hp. So sometimes it will sux to have a fully tuned TVR Speed 6 to go against a 787b or a GT-1 Road car. Something u can do to have an equal race is to take out all the mods from the car to the point of leaving it stock. But that would suck, especially doing to all ur garage cars. The only cars that stand a chance, fully modded in arcade hard mode are the 787b, GTR-1 Nissan LM car (cant remember the name) and the Toyota GT-1 ROAD car.