Car actively trying to swap ends on track?

[WARP TEN]

Originally Posted by Vette Guy

Maybe a bad run of 315 Sumis? That did cross my mind....

Originally Posted by Hib Halverson

.......Ditch the Sumitomo tires. They are crap. I don't care what anyone else, here, says. For track use Sumitomos are at the bottom of the list of tires I'd consider for tracking.............

Have to concur with both. Not sure there has ever been a good run of Sumis. I had a couple of sets of Sumis, one I bought because they were cheap ('93) and one because they were on the car when I bought it ('95). They got hard fast, seemed to have little traction and on my '95 I had a wheel vibration that I could not eliminate by balancing until I finally got to a great tire place in Bowling Green (S&R Tire on Lover's Lane) with an excellent tech and a Hunter Road Force machine in 2014. He had to spin all the tires on the wheel rims to get them even close and one tire he said he could not balance properly because it was so far out of manufacturer's specification. He eliminated about 95% of the vibration though which was a help. I switched to Michelin Pilot Sports shortly thereafter. Great tires even if a little bit wider in the rear. --Bob