Originally Posted by
RBLove
Change stock to 21.5. It will slow it down enough that the fast 17.5 guys will move to super stock and actually make it a class. Stock should also exclude sponsored drivers.
21.5 stock
13.5 super stock
Open mod
As has been mentioned a couple of times, that is the exact class structure we have over here on Australia. And fundamentally (although most of our tracks are probably a bit larger than the USA norm) they work very well.
Speed differential between the classes it about right for the average track, with generally a second or two split between classes on a per lap basis.
21.5 blinky is also a good beginner class. At the local track we have a novice heat, and the two guys who have only been running a short while are clearly making good improvements each week, and that's the motor they run. Works well, IMO.