Like stated above, PAX is just a number to multiply your raw time by to compare the different classes. For example...
A Mod PAX = 1.000 (Should be the fastest time at the event)
SS (Stock Class) PAX = 0.843
So if the A Mod ran a 100 second lap, 1.000 X 100s = 100 seconds adjusted
If the SS car ran a 118.64 second lap, 0.843 X 118.64 = 100 seconds adjusted
It's just a way to compare times across classes.
As for your second point, horsepower is almost never the cause for a slow autocross time. Tires for me have always had the largest impact BY FAR. If you can come out of a turn and flat foot the throttle with no issues then maybe you need more power. If you are new to the game, then practice will be a huge contributor to improving times. Knowing how to line up multiple elements of the course, driving smoothly, etc... will all help.
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