The PAX Index

The PAX Index is a system of handicapping cars, so that cars 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.

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.

2002 Sacramento PAX Index

Modified		Prepared		Street Prepared		Stock
--		--		OSP	.855	SS	.836
AM	1.000	AP	.874	ASP	.846	AS	.828
BM	.951	BP	.867	BSP	.840	BS	.827
CM	.919	CP	.854	BSPV	.845	CS	.812
DM	.894	DP	.849	CSP	.842	DS	.798
EM	.904	EP	.868	DSP	.820	ES	.802
FM	.897	FP	.865	ESP	.826	FS	.809
				FSP	.817	GS	.785
F125	.932			STS	.784	HS	.779
Fjr1	.815			STX	.801
Fjr2	.774			SM	.834
				SM2	.856

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