In today's "tech speak" Indycar needs to go the way of "open protocol" compatible specs. Give an overall minimum weight (w/ driver), maximum wheelbase length, max. wheel track width, max. displacement for stock blocks, max. displacement w/ max boost for turbos; allow hybrid racing (w/ max. engine displacement). and that is IT. One page rulebook. No all electric-car limits

Let ingenuity and the 'marketplace' provide the cars.