With NHRA rule changes in recent years making Pro Stock cars more compact, a change from an 8.2 L (500 cubic inch) V-8 engine to a modified factory four or six cylinder double overhead camshaft engine can easily convert a Pro Stock car to Sport Compact Pro Rear Wheel Drive car. The cars are separated by performance, and since 2003 categories have been split based on the car’s drive wheels. Ironically, almost all NHRA Sport Compact records for elapsed time and speed are held by General Motors and Ford cars, rather than the imports.

Several things are important on the way down the track in drag racing. The first is not to cross into your opponent’s lane, as this will result in disqualification. In case of a double disqualification in which one driver commits a foul start and the second driver crosses into his opponent’s lane, the driver who committed the foul start wins. Another important consideration is when to shift gears. Most drag cars are shifted manually by the driver, and there are optimum times for shifting that vary with each car. Typically, power will increase as the engine RPMs (revolutions per minute) increase, but only up to a point before power begins to taper off. The ideal time to shift is at the peak power point. Most drag racers use a tachometer to judge shift points. In Fuel classes especially, “pedalling” the car (adjusting the throttle) to prevent loss of traction is often important and one measure of how good a driver is.

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