Nov 182012

2013 Autocross PAX

The PAX is a handicap system used in Autocross to allow all cars to compete against each other on a level playing field.  For example if you drive to the event in your daily driver stock Miata, you are going to have a hard time beating a fully prepped Nissan GTR on race tires.  The PAX system allow you to multiply your RAW time to get a PAXed time.  All the PAXed times can be compared to see who performed the best in the car they drove.  The system is not perfect but it is a good gauge of how well you are driving your car.  Every year it is recalculated to try to keep the Autocross PAX system as accurate as possible.

The 2013 Autocross PAX results have been released and it seem like most groups have taken a hit with the average PAX score being raised by approximately 0.25% Which is will relate to around 1-4 tenths on most autocross tracks depending on length.

2013 Autocross PAX for Rx8

2013 Autocross PAX

Originally from NASIOC forum

What does that mean for the Rx8 drivers? Well if you are in C-Stock, RTR (Race Tire Rear wheel drive) or SM (Street Modified)this is great news.  If you are in STX (Street Touring Extreme) or the newly allotted DSP (D-Street Prepared) Then this is bad because the hit it one of the highest of all the classes at 0.005 and 0.004 respectively.

2013 Autocross PAX – C-Stock & RTR

C-Stock only took a 0.001 hit which I would class as positive because it is lower than most.  This of course also benefits the RTR class which allows any rear wheel drive car compete with the Stock PAX on street tires as long as they are legal for all Stock rules.  A 0.001 hit equates to approximately 0.07 Seconds on a 60 second course, which shouldn’t lose you too many positions over the year.

2013 Autocross PAX – STX

STX is one of the most popular classes in the USA like most ST classes the main reason in my opinion is that you invest money in mods rather than tires (Hoosiers are expensive). STX allows you to drive to the event in your daily driver car, race, be very competitive and then use the same car to drive to work every day.  This is what I have been doing for the entire 2012 season, quite well might I add bagging 8 trophies for the year.

The 2013 Autocross PAX has been harsh for STX with a massive 0.005 hit or 0.6% which on a 60 second course will be approximately  0.3 seconds and 3 tenths can be several places on the PAX list in a competition.

2013 Aurocross PAX – DSP

That’s right folks the Rx8 has now been dropped into the DSP class which is good news as the PAX is better than BSP which was the Street Prepared class for the Rx8 last year.  However the changes are not as good as we would like seeing as BSP’s PAX was actually one of two classes that were lowered.  DSP on the other hand say an increase of 0.004 (0.47%) which although not quite as bad as STX it is still a big hit.  Resulting in a 0.24 second slower PAX time on a 60 second course. However still better than the previous year where the Mazda Rx8 was in BSP therefore the actual PAX compared to last year is 0.24 seconds faster, if you managed to follow the maths.

 2012 Autocross PAX – SM

For those of you lucky enough to have forced induction and be in SM (street modified).  The PAX has been kind with the same change as C-stock at just 0.001 (0.12%) increase. Which again relates to a 0.07 Seconds slower on a 60 second course.  Generally SM did better than most so they should be slightly higher up the PAX list in 2013.

How to class your car

If you are unsure which class you should be in then you can view the entire SCCA Autocross Car Class Rules, but here is a basic outline.  Please make sure you check all the rules very carefully before you buy any modifications for your car, some modifications will put you straight into SM and not give you any significant advantage.

RTR (Road Tire Rear wheel drive) – If your car is completely stock then this is the class for you.  The only mads allows in this class are the C-Stock allowances with Street tires

C-Stock – This class allows DOT approved race tires, aftermarket shocks, front sway bar, light weight CAT-back exhaust and that’s about it.

STX  – Here you are allowed coilover suspension, front and rear sway bars, strut braces, lighter brakes, 9″ wide wheels and up to 265 wide tires for the Rx8, induction kit, high flow cat, a light engine tune (Cobb Access Port) all of the C-Stock allowances other than DOT approved race tires and a few other changes.

DSP – All the STX and C-Stock allowances plus flared fenders to allow any sized wheels and DOT approved race tires,  any steering wheel, remove aircon and stereo components, lightweight clutch and flywheel, CAT removal and a few other modifications.

SM– All modifications from C-Stock – STX and DSP with the addition of bigger brake kits, any suspension (original mounting points), light weight body panels, aerodynamic parts such as wings and splitters, rear seat removal, forced induction such as turbo or supercharger and lots of other modifications.
Hopefully you have gained some insight about the 2013 Autocross PAX system and what to expect in 2013.  Please leave a comment and share this information with your friends.  I hope you enjoyed learning about the 2013 Autocross PAX.

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