An oversteer question

[DAVID GAGNARD]

Curt;

At a recent open track event I had a similar problem.... Although my car is a 65 Fastback,I think most things would carry over.....

First,chalk your tires,meaning talking some of the kids "window paint' and putting on the sidewall of all four tires going into the tread,that way you can see if your tires are "rolling over".

One of the driving instructers recommend I start with 40 psi in the front and 38 psi on the rears,cold tires....First session I was "loose" or had a slight but not too bad oversteer.... Tires were nowhere near rolling over on the sidewalls...

Next, he had me lower air pressure by 2 psi on all four tires,next session was a lot better, no loose condition,car had a very even and predictable four wheel drift with hard cornering....Still no tire roll over....

Third session,lowered air pressure 2 psi again on all four tires,got real loose with this pressure and tires began to roll over.... Came in and he checked the tires and I told him it went real loose, he said,well, now we have found the limits of your tires,back to 38 psi front,36 psi rears....

this is all on pure street tires,in the process of getting another set of wheels and some "racing" tires,probably Hoosiers...

Hope this helps;

David