JG Pasterjak said:
" 1 class with tire width limits based on weight"
I pitched it at one point. It is highly flawed based on the current realities of the sport. A 3000lb front engined four-seat car with struts is very different from a 3000lb mid engined two seat car with A-arms. And if you're like "Well you can convert that four-door strut car to A-arms by fabricating subframes." Cool. Show me the car. When all these cars that could exist actually start existing the ruleset is flexible enough to properly accommodate them.
And, yeah, rules bloat is a real thing. If you recall, the $2000 Challenge used to have a very short set of rules, and the event almost failed because of it. Still, I'll say there's very little under this X/CAM ruleset that you CAN'T do. Literally ANY car built to the limits of these rules could win any of these classes. But cars built to the limits of these rules simply don't exist, and one of the ways to hopefully nurture these classes to the point where those cars DO exist is to seed them with a sensible mix of cars that exist today from the current and likely marketplace.
WRT tire size, I floated an over/ under tire size within XB, for a selfish enough reason, to give my little E21 a place to play, and cars like it.
In the class you can go wild with motor swaps and turbos, etc, but I won't be doing that, so as the car stands now, with a few traditional hot rod tweaks, wouldn't fit anywhere else.
But if you keep XB as is with the exception of bigger/smaller than say 225, then the wild built machines and mild built machines have a place to go.
Nobody is going to turbo and wing up an old Miata and leave it on narrow tires anyway, or an X1/9, etc.
And while the E21 will never be competitive for fastest in class on anything, at least I could reasonably see how it compares to similar machines.
Once I get it sorted it'll see autocross no matter what, so it won't keep me away, just like having a non-competetive in STR NB1 Miata doesn't keep me away.
But, like in STR, at least I could be in the ball park of some category.