race teams have plenty of cash, can get access to track testing and don't have to share with the guy doing odd data logging, they test on dynos and wind tunnels too, last time i checked they didn't drive dynos or wind tunnels around on a track.
i've tried getting into my local track to do testing of hardware and stuff, they're not even remotely interested and want me either to rent the track for the whole time, or go with a group which just doesn't work since when you're doing this sort of work you're stopping and starting all the time, and it just annoys everyone, plus you end up spending most of the time explaining what you're doing.
plus the track is relatively flat, changes a lot and its difficult to repeat the results, a great big long straight going up a hill is like a dyno with real air flow and you don't have to speed.
also race cars aren't usually street legal
