Gar Ratio.
 

Go under the car and press "I". Then you could select one of yours diferentials.

Anyone have any tips on how to not blow out your engine during a race? Because it keeps happening to me often

I have never had my engine blow up... But my tires, yes. In the last area there is some pipes or ditch or whatever running on the ground leaving you with a very small area to use to drive on.

What I did back in the days was to test drive it and learn where to be exactly by saving before the race and reloading every time. The ditches don't move so you can end up finishing a race at top speed without crashing.

I thought maybe I just had overtuned it? You know where you can go in and adjust it?

IDK, I know even less about cars than I do about computers

I am afraid I cannot help you here for the same reason. I do remember beating the game without this problem though.

I seem to remember there being a rev counter and a manual gear change in this game for certain cars you can only go flat out in top gear other wise you blow the engine.

I think my engine constantly blowing out my have had something to due with it being extremely worn out when I purchased it second hand

engine bow out
 

R
Enable sound - you will hear non-vibrating sound when your engine is about to blow.