damage realism

I would like to request that the AI take damage. The racing is less realistic if the AI can just crash into anybody and anything and continue driving without retiring or repair. I also noticed during at least one of my races that they did not to refuel the entire race, while I only made it half...

Hello guys, a short question by my side: Who know what's the realistic % of damage to be set in game? The default one is 50%, but to me it seems to arcade; if you set it to 100% everything seems to fragile. Cheers