I first came across this game on the PC so have never played the Amiga version. Have downloaded your tracks though so will take a look when I get myself up and running :-)
Does the Amiga version have the same "features" the PC version has? On the PC version if you got up to a very high speed and crashed into something at funny angles the car would take off. And I mean take off sky high and you'd end up with an arial view of the track. I think it was a bug.
This also seemed to work if you constantly forced your car into the computer controlled car too.
You could also build tracks with really long tunnels and when you got up enough speed you could drive upside down in the tunnel
I've never liked playing games the way you're "supposed" too