i was thinking to add 1 more category. the engine fuel consumption itself
-small and light engine
-but consumes more fuel in favor of responsiveness
-but is pushed to lower the fuel consumption for it's size
these 2 cars might have similiar size fuel tank, which means similiar weight in fuel
then again. you could either push a F1 or MotoGP fuel rules.
F1 has a limit of the fuel allowed to be consumed by the engine per lap
MotoGP basicly limits the total amount of fuel on an entire race (20lt iirc)
both which might be easier to implement, but means lowering the amount of differentiation of the cars people will build.
also considering the open beta, which makes the engine a lot more prone to overheating. might make the overall race SSSLLLLLOOOOOWWWWWW (due to drag)
and a question
you said track humidity. will humidity affect the overall engine performance?
and will the track temperature effect the cooling?