Quote:
Originally Posted by cdb95z28
I talked to a GM Gen6 brake engineer concerning a braking issue I had 2 years ago on my Gen5 1LE. The only thing that was different for me in that instance was a tire change. That was the obvious part of course. He agreed and stated the ABS cal is sometimes not very forgiving. They are calibrated to alot of factors, similar to an engine cal. Since the tires are at the heart of the ABS, and ESC, a big change from the OE cal (3R) is not going to yield a good result.
Did you run those same exact tires, the same set, before on track? If so, since they are a street tire, they are already heat cycled out. The fronts didn't lose traction because of the weight transfer. I bet those tires would have a softer sidewall compared to the 3R, possibly the ESC would pick up on that. Did the car feel like it had more dive under braking?
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Good info, thanks...
These were the same tires... I never thought a street tire would heat cycle out like a race tire..
I felt little to no dive under braking.. it felt like most of the braking was on the rear... interestingly, cornering and acceleration grip did not seem to be reduced at all.... my only issue was in straight line moderate braking... I believe threshold braking would have resulted in an uncontrollable car.
I believe the Mich’s are a great street tire, and acceptable for occasional track days, as long as you don’t expect 3r performance... this was a bigger issue than 4 corner loss of grip..
I’m tying to find something else... I’ll get the car on a lift and check for dramatically worn front pads.., I thought the ABS would account for that ???
Thanks again,
Bill