Throw on realistic damage and stick to the inside of the oval. That's all I can really suggest. The tight turn arounds are where you'll get the most punishment, but if you can survive the first lap, it'll only get easier as the ai slaughter one another.
Ultimately though I don't recommend keeping realistic damage on after the fact. Some events like the Rammer RS challenge, and demolition events with respawns get easier, but many races get frustratingly difficult, and last man standing demolition derbies result in everyone dying in moments from lost wheels.