Abstract: A race for street cars driven by non professional drivers on circuit-type race courses begins with an average car driver wishing to race other like drivers requesting an application for registration. The entrants, with now pre safety inspected cars, arrive at the track on the day and time set out in the application. Entrants are assigned to groups based on the performance potential of their cars, generally whether the car is a large or small sports or touring type car. After being briefed on race procedures and rules, the entrants undertake a practice driving session on the track course. Next, the entrants drive 10-15 qualifying laps with the time of each lap recorded. Based on the fastest qualifying lap time, a Performance Parity Time (PPT) is calculated for each entrant. Now ready to race and again by group, the entrants are released from the track pit in reverse order based on their respective differences in PPT. Each race, typically 50 laps, may require at least one pit stop.