The PAX factors are derived from comparisons of the best drivers in the different open SCCA classes in a selected series of events. Thus a PAX factor is a sort of handicap with a PAX of 1.000 being for the fastest class of cars (A-Modified). Use the table below to find the PAX factor for your car's class. The official PAX Web Site contains both present and past PAX factors. For additional information and explanation of how PAX works, visit our Understanding PAX page.