| 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2002 Dave Beck no longer
maintained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 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. 2007 SFR Handicap IndexSan Francisco Region uses the straight
RTP/PAX index, with the addition of entries for OSP,
ST2,
and
BSPV (which
are not national classes and therefore do not have RTP/PAX indexes). We index
OSP at .856 for
indexed
overall
TToD
and
for
people running in Novice
and Street Tire classes, for example.
| Modified |
Prepared |
Street Prepared |
Stock |
Street |
Kart |
|---|
| -- | |
-- | |
OSP | .856 |
SS | .848 |
-- | |
F125 | .946 |
| AM | 1.000 |
XP | .874 |
ASP | .858 |
AS | .838 |
SM | .856 |
FJA | .851 |
| BM | .944 |
BP | .866 |
BSP | .853 |
BS | .828 |
SM2 | .862 |
FJB | .833 |
| CM | .909 |
CP | .864 |
CSP | .845 |
CS | .822 |
STU | .821 |
| |
| DM | .889 |
DP | .860 |
DSP | .836 |
DS | .804 |
STX | .808 |
| |
| EM | .879 |
EP | .863 |
ESP | .834 |
ES | .812 |
STS | .805 |
| |
| FM | .890 |
FP | .868 |
FSP | .823 |
FS | .809 |
ST2 | .806 |
| |
| | |
GP | .847 |
BSPV | .853 |
GS | .803 |
| |
| |
| FSAE | .949 |
| |
| |
HS | .789 |
| |
| |
Based on Rick Ruth's
reference table.
"A Prepared" was renamed "X Prepared",
and new "G Prepared" class was introduced in 2006.
|
