... did anyone here ever play the original Rollcage games? I really don't know what they are going to use in GRIP as a theme but the original ones all had JET ENGINES strapped into those hulking metal beasts because it's the only thing powerful enough to accalerate those beasts. Or maybe my memory is faulty and it was only the last and best car you unlocked that had that... it had two jet engines, was frigging insaaaaaaaaaaaane!
But yeah, you're going to have to think bigger, like those guys strapping helicopter engines to trucks and pull massive weights kind of engines.
Like, check out THESE engines: https://www.youtube.com/watch?v=xfzXz8nOiK8
now you find me engines more fitting to mass and wheel than some of these and I'll eat my briefs.