To get any kind of equivalence e.g. 8.5T non-boost = 10.5 boosted you'd need to run some tests - get the best driver you can, and then get him to set a fast lap with each (in the same car). The more clean lap times, the less the uncertainty (Standard Deviation and all that). The fact you're moving to a new track soon might change that, as boost favours bigger tracks (I think).
I agree with Moley about wallet racing - the touring cars have become absurdly expensive because of the arms race of speed controllers, wear rate, tyres and a new chassis every year. Off-road avoids much of that because the tracks limit the speeds attainable. Thus, in terms of F grades, ability will have a far greater impact than equipment. I'd probably be as fast with a 13.5 as an 8.5 on most tracks, whereas a better driver would be markedly faster.
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