Professional Autocross Index (PAX)
The NWR Solo program uses the PAX quite extensively in the classes that compete in our regional events. PAX is a index system designed to equalize participants running cars from different SCCA Solo classes in the same local regional class. The PAX value is a multiplier used on the entrant’s time, and then compared directly with other class competitors and their PAX multiplied time.
The Official PAX values are determined each year
Great Lakes Solo Series website
SBR Solo Rules