[thstone]

There are at least three spec series for the 986 Boxster;

1. PCA SPB
2. POC BSR
3. NASA Spec 986

The POC has taken the path to align itself with the PCA so the POC rules and PCA rules are 99% the same. This allows drivers to race in either series without worrying about car configuration.

The NASA Spec 986 rules are 98% common with the PCA/POC rules. There are a few items that differ from POC/PCA but not significantly. Engine, gearbox, weight, suspension are all the same as POC/PCA. Difference example; NASA allows 94 octane fuel whereas POC/PCA allows no more than 91 octane.

The top five biggest contributors to different lap times in the three series are:

1. Driver skill
2. Driver skill
3. Car/driver at min weight with a competitive suspension setup
4. Weather & track conditions
5. Driver skill