Anyone tried this? I know understeer is gonna be horrible, any suggestions for tire pressures on 15 inch wheels and 205/50/15 tires? Full tire pressure won't work though, because there will be to little grip I think.

 

I'm not sure any organizer will actually alow runs in the rain. If they do, it's irresponsible.

 

We do this often here. I usually run about 3-4PSI lower than normal depending on how much grip there is. Check scuffing to see that you're using your whole tread surface but not rolling over onto sidewall.



Grip is less, your car will be more eager to get out of shape, and slightly harder to recover quickly once it does.

 

I've been on a road coarse in light rain. Also in snow. They had to call the day off when it snowed but it was a riot for a while. Forget traction in either case.

 

Autocross in the rain is a blast, there's usually one or two wet events each season around here.