Actually this began as a car physics engine but I havent gotten much work done on it lately because Ive been wasting all my time tooling around in the go cart enjoying the view!
I have it set to run at 60 fps but you can hit the "1" key to set the sync rate to "0"
I get 165 to 175 with sync rate 0
I relaxed the physics a bit to make it a bit more enjoyable
but you may see minor jitters here and there
by the way, the cart and trees are just placeholders! I know they suck!
cursor keys control
up = gas
down = handbrake
left and right = steering
"1" = sync rate 0
"2" = sync rate 60
6.2 meg
download it here -->
http://users.kascable.com/rkaf/mntn_vac.exe