PAX- How does it all work?
PAX/RTP is a method of grading on a curve.
Cars are assigned handicaps based on their make/model/year and level
of modification. These handicaps are based on actual performance of
cars that have run in events, and are determined by the national PAX
administrator, currently Rick Ruth. They are used to judge performances
at the national level, and are accepted by all competition entrants.
The most modified car is "A Modified", which gets a score of 1.00,
so it's time would not be adjusted at all. Everything else gets multiplied
by a figure that you could call a PAX handicap. Here's an example:
Car
Class
Raw time PAX
handicap
PAX time Place
'03 Corvette
SS
50.00 .856 42.80
2
'04 Focus
HS
53.25 .802 42.70
1
'04 Dodge SRT4 STU 52.45 .836
43.84
3
So a Focus that finished three seconds slower than the Vette actually
won.
You will notice that the Street Tire classes (STS, STX,
STU) are less handicapped than the Street Prepared classes (SP), so
if you want to build a tuner car and not spring for R Compound tires,
be mindful of what mods will kick you out of the Street Tire classes.
R Compound tires will typically make a car 2-3 seconds faster, but
cost in excess of $800 plus a set of wheels!
2009 PAX/RTP Index
| SS |
0.856 |
|
ASP |
0.866 |
|
XP |
0.882 |
|
AM |
1.000 |
| AS |
0.843 |
|
BSP |
0.859 |
|
BP |
0.868 |
|
BM |
0.944 |
| BS |
0.835 |
|
CSP |
0.862 |
|
CP |
0.864 |
|
CM |
0.907 |
| CS |
0.837 |
|
DSP |
0.845 |
|
DP |
0.865 |
|
DM |
0.900 |
| DS |
0.819 |
|
ESP |
0.846 |
|
EP |
0.861 |
|
EM |
0.894 |
| ES |
0.823 |
|
FSP |
0.831 |
|
FP |
0.872 |
|
FM |
0.903 |
| FS |
0.833 |
|
|
|
|
GP |
0.841 |
|
FSAE |
0.954 |
| GS |
0.821 |
|
ST(STS) |
0.818 |
|
|
|
|
|
|
| HS |
0.802 |
|
STS (STS2) |
0.820 |
|
|
|
|
F125 |
0.957 |
| |
|
|
STX |
0.822 |
|
|
|
|
FJA |
0.860 |
| |
|
|
STU |
0.836 |
|
|
|
|
FJB |
0.832 |
| |
|
|
SM |
0.867 |
|
|
|
|
FJC |
0.778 |
| |
|
|
SSM(SM2) |
0.876 |
|
|
|
|
|
|
Rick Ruth PAX/RTP Administrator
