I've been sitting on the sidelines and learning as much as I can about amateur road racing with the intent of jumping in soon. I've looked closely at NASA CMC and also IT in SCCA and spec Miata and RX7. I'm leaning towards IT because I'm not sure I want to race a big bore, heavy American car in CMC. However, the NASA CMC and AI format makes the most sense to me. My question is - why doesn't SCCA adopt this format? I'm talking about power-to-weight ratio.

The GCR goes in great detail about what mods can be made to what cars and so on. It seems to me it would be far easier to class cars based on power-to-weight ratio. It would basically say "we don't care what you run or what you do to your car, but you must maintain a XX:Y power-to-weight ratio." Why isn't this format used in IT?

It seems to me that trying to specify all parameters of all cars can't cover all scenarios and only opens up the door for cheating.

This is a FMI (For MY information) post only. No flames intended.

Seriously, why doesn't SCCA use this format?

Thanks,
Scott