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Updated 3/3/2000
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2000 PAX Index |
The SFR Handicap Index ("PAX")
The PAX Index is a system of handicapping cars, so that drivers in different
SCCA classes may 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 is now updated each year by Dave Beck.
The 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.
PAX numbers are compiled primarily from the results of a series of midwestern
events, though some attention is paid to the Solo II nationals.
2000 SFR Handicap Index
San Francisco Region uses the straight PAX index, with the addition of
an entry for OSP (which is not a national class and therefore does not
have a PAX index). We index OSP at .855 for people running in Rookie, Street
Tire, and PAX classes, for example.
| Modified |
Prepared |
Street Prepared |
Stock |
| -- |
|
-- |
|
OSP |
.855 |
SS |
.830 |
| AM |
1.000 |
AP |
.872 |
ASP |
.852 |
AS |
.815 |
| BM |
.955 |
BP |
.874 |
BSP |
.847 |
BS |
.812 |
| CM |
.924 |
CP |
.857 |
CSP |
.844 |
CS |
.804 |
| DM |
.900 |
DP |
.853 |
DSP |
.819 |
DS |
.799 |
| EM |
.908 |
EP |
.873 |
ESP |
.822 |
ES |
.786 |
| FM |
.904 |
FP |
.865 |
FSP |
.817 |
FS |
.807 |
| |
|
|
|
|
|
GS |
.789 |
| F125 |
.948 |
SM |
.846 |
STR |
.810 |
HS |
.781 |
SFR runs SCCA Street Touring R as our "Street Touring" class.
When Street Touring runs in Street Tire, PAX, or Rookie class, it is handicapped using
the STR index. Why? Because it is compared against cars in
CSP, for example, whose index is also calculated using results of cars
running R tires.
For your reference, the national PAX index for STS is 0.783.
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