The SFR Handicap Index ("PAX") PDF Print E-mail
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The PAX Index was a system of handicapping cars, so that drivers in different SCCA classes could compare times against each other.  John Kelly tells us it was invented by Jim McKamey for a series of autocrosses he ran at one time, and has been updated each year by Dave Beck. 

The RTP index is a separate set of indexes, calculated from different events, but basically similar.  They used to be separate, in any case, but starting in 2002 Dave Beck no longer maintained the PAX index, and Rick Ruth combined and enhanced them into the RTP/PAX index.  Info about it is maintained at

 www.scca-chicago.com/solo/indexes

"This Index was developed by Rick Ruth and reflects results from over 30 large events including, the Tire RackŪ Solo II National Championships, National Tour, Subaru CenDiv, Chicago Region SCCA, Tri-State Sports Car Council and Wisconsin Autocrossers Inc events. This index is designed to incorporate some of the previous PAX substance with the RTP Index of the past"

This index is the basis for the SFR Handicap Index.

The RTP/PAX index for the fastest class (AM) is always 1.0. For any other class, multiply your time by the index for your class to get the time you theoretically would have run in an AM car. 

2009 SFR Handicap Index

San Francisco Region uses the straight RTP/PAX index, with the addition of entries for OSP and BSPV (which are not national classes and therefore do not have RTP/PAX indexes). We index OSP at .869 for indexed overall TToD and for people running in Street Tire classes, for example.
 
Modified Prepared Street Prepared Stock Street Kart
--   --   OSP .869 SS .856 --   F125 .957
AM 1.000 XP .882 ASP .866 AS .843 SM .867 FJA .860
BM .944 BP .868 BSP .859 BS .835 SSM .876 FJB .832
CM .907 CP .864 CSP .862 CS .837 STU .836 FJC .778
DM .900 DP .865 DSP .845 DS .819 STX .822   
EM .894 EP .861 ESP .846 ES .823 ST .818   
FM .903 FP .872 FSP .831 FS .833 STS .820   
   GP .841 BSPV .861 GS .821      
FSAE .954       HS .802       

Based on Rick Ruth's reference table
Thank you Rick!!

Last Updated ( Monday, 16 February 2009 )