Solo II Pax Index

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.

"Racers Theoretical Performance"

This Index was developed by Rick Ruth and reflects study of results from over 200 nationwide Solo II events including, the Tire Rack Solo II National Championships, National Tour, Chicago Region, Houston Region, Milwaukee Region, New England Region, Northern New Jersey Region, Philadelphia Region, Southeast Divisional Series, San Francisco Region, San Diego Region, South Jersey Region, Subaru CenDiv Series, Tri-State Sports Car Council, Texas Region, Wisconsin Autocrossers Inc., and several others.

Index archives
PAX/RTP  2010 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002
PAX 2001, 2000, 1999, 1998, 1997, 1996, 1995, 1994
RTP 2001, 2000, 1999, 1998, 1997, 1996, 1995

Past Nationals results
PAX/RTP 2008, 2007, 2006, 2005, 2004, 2003, 2002
PAX 2001, 2000, 1999, 1998, 1997, 1996, 1995
RTP 2001, 2000, 1999, 1998, 1997, 1996, 1995

Past National Tour results

2009 Dixie, San Diego, Houston, Farmington, Blytheville, Finger Lakes, Peru, Packwood, Vail, Blytheville(2)
2008 Dixie, San Diego, Ft. Worth, Atlanta, Devens, Peru, Milwaukee, Packwood, Kansas City
2007 Dixie, San Diego, Atwater, Walnut Ridge, Houston, Huntsville, Peru, Milwaukee, Packwood
2006 Ft. Myers, San Diego, Walnut Ridge, Houston, Atwater, Peru, Devens, Milwaukee, Denver, Packwood
2005 El Paso, San Diego, Houston, Walnut Ridge, Atlanta, Atwater, Toledo, Peru, Devens, Packwood, Denver
2004 Toledo, Peru, Bremerton

2010 Pax Index

note: classes marked with an * include changes made in the stock class shuffle or are new classes (STR and SMF). SS 0.860   ASP 0.871   XP 0.890   AM 1.000 AS* 0.854   BSP 0.865   BP 0.875   BM 0.965 BS* 0.847   CSP 0.863   CP 0.866   CM 0.915 CS* 0.840   DSP 0.849   DP 0.874   DM 0.913 DS 0.825   ESP 0.852   EP 0.873   EM 0.907 ES 0.829   FSP 0.838   FP 0.876   FM 0.908 FS 0.837         GP 0.850   FSAE 0.960 GS 0.812   ST 0.824             HS 0.803   STS 0.826         F125 0.959       STR* 0.842         FJA 0.869       STX 0.830         FJB 0.834       STU 0.844         FJC 0.772       SM 0.877                   SMF* 0.870                   SSM 0.883