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The following list shows the 2006 pax index used for each class. These are the values that are used to multiply the raw time for a run to equate to the paxed time. 
SS 0.840   ASP 0.852   XP 0.868   AM 1.000
AS 0.831   BSP 0.843   BP 0.862   BM 0.944
BS 0.822   CSP 0.838   CP 0.856   CM 0.909
CS 0.813   DSP 0.829   DP 0.853   DM 0.885
DS 0.798   ESP 0.828   EP 0.858   EM 0.881
ES 0.806   FSP 0.814   FP 0.863   FM 0.887
FS 0.805         GP 0.844   FSAE 0.948
GS 0.794   STS 0.797            
HS 0.780   STS2 0.802         F125 0.937
      STX 0.804         FJ1 0.781
      STU 0.820         FJ2 0.796
      SM 0.845         FJ3 (FJB) 0.830
      SM2 0.854         FJ4 (FJA) 0.837

The PAX factors are derived from comparisons of the best drivers in the different open SCCA classes in a selected series of events. Thus a PAX factor is a sort of handicap with a PAX of 1.000 being for the fastest class of cars (A-Modified). Let's look at an example.

RAW TIMES FOR SAME DRIVER IN CARS IN 3 CLASSES

To understand PAX factors consider what would happen if one of the best drivers in the country practiced in three different cars which were prepared to the limit of the rules for their class and then competed in each car on the same course. That driver would achieve the raw times in an AM, SS, and HS car shown at the right.

PAX FACTOR CALCULATION FOR CARS IN 3 CLASSES

Therefore the fastest car is the AM car and the slowest is the HS car. If we were to divide the raw time for the fastest car (AM) by the raw time for each car we would get the PAX Factor relative to the fastest car as shown to the right.

PAX TIME CALCULATION FOR CARS IN 3 CLASSES

If we now MULTIPLE the raw time for each car by the PAX Factor we will get the PAX Time for each car as shown to the right.

PAX TIMES FOR 3 DRIVERS IN 3 CARS

So, the PAX Time for each car is the same, which is what we would expect if they were driven by the same driver with ample practice in each car. But, what would happen if each car was now driven by a different driver? The process is the same...MULTIPLE the Raw Time received by each entrant by the PAX Factor for the car's class. Suppose the results were as shown to the right.

As you can see in this example the car actually winning the class would be the HS car because the driver turned in Raw Time which gave a PAX Time better than the others. The driver of the SS and AM cars did not extract the same potential as predicted by the PAX Factors which says they should have received faster Raw Times.

Since it is not possible to get the same driver trained in the best prepared cars in every class, PAX Factors are derived from analyzing the results of top drivers in the best prepared cars in several selected events across the country to try and determine the predicted performance of fully prepared cars in a given class.

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