Written By Tony “Mario” Crea
|PAX could best be described as a relative index of performance in autocrossing, much the same way a handicap rating is given in the game of golf. PAX indexes are based on results from the SCCA National Championships (the best of the best) each September. How strongly a class performs compared to the thirty-something other classes represented helps determine PAX indexes the next year. The following is an example showing how PAX is used at events…
The class “A Modified” is the fastest class in autocrossing; it is expected that the cars in this class represent the pinnacle of autocross-specific race car design, engineering, and performance. The class rarely disappoints! Due to its unbelievable performance, the PAX index for this class is 1.000 (no handicap is given). This means that if an A Mod car runs a time of 50 seconds, it will show up on the final results as 50 seconds.
Now let’s compare this to a car in “C Street Prepared”, which has a PAX index of .844. A car in CSP runs a time of 62 seconds on the same course as the A Mod car, yet its time will appear as 52.328 on the final standings. This was done by multiplying the raw time by the PAX index. As a result, the CSP car finishes only 2.328 seconds (not 12 seconds) behind the A Mod car. Yes, it still lost based on raw speed alone, but it allowed the driver in the CSP car to finish much higher overall. Thus, most regions base their overall driver championship on PAX performance whereas class championships are based on raw times.
2023 PAX/RTP Index
“Racers Theoretical Performance”
This Index was developed by Rick Ruth and reflects study of results from well over 500 nationwide Solo events including, the Tire Rack® Solo National Championships, National Tour, Alabama Region, Arkansas Region, Atlanta Region, Chicago Region, California Sports Car Club, Central Florida Region, Equipe Rapide (Florida & Texas), Great Lakes Solo Series, Hawaii Region, Houston Region, Midwest Divisional Series, Milwaukee Region, New England Region, Northwest Region, Northern New Jersey Region, Oregon Region, Philadelphia Region, Rocky Mountain Series, San Francisco Region, San Diego Region, South Jersey Region, St. Louis Region, Tri-State Sports Car Council, Texas Region, Washington DC Region, and many, many others.
Past Nationals results
Past National Tour results
The PAX/RTP Autocross Index page is hosted by Solo Performance Specialites, LLC.(SoloPerformance) Visit SPS at www.soloperformance.com
Past ProSolo results