Autocross is a timed form of racing that allows drivers of various skill sets and cars to compete in a similar environment; however, there is also a way for drivers to compete against one another in separate classes. How is that done if drivers are in cars that are faster and have more experience? Welcome to the wonderful world of PAX Scoring.

Well, it’s actually not known as PAX Scoring anymore. PAX stood for Professional Autocross, with the “X” as the short term for "cross". While many older drivers and clubs will still call it PAX, it’s actually now known as the Racer’s Theoretical Performance (RTP) index. It is a multiplier that is summed into the time drivers turn in that will give the score for all drivers overall.

How is this done? Where does the multiplier come from, or how is it created?

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