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#1
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Experienced Member ![]() ![]() ![]() Group: Advanced Members Posts: 1,099 Joined: 14-October 06 From: Mobile, Al Member No.: 1,410 ![]() |
First time on r comps.
The front end is chattering in the corner, get on the gas and it fixes it cant carry any entry speed because of it. Tires are BFG R1's, pressures to start are 30F 26 R, end of session 34F 33R. I took the rear spring rubbers out and lowered the rear. The ass end was all over the place, this helped a bunch and dropped 3 seconds off the lap time. Go up or down on pressure or what? You enter the corner, the car starts to push and the tires chatter, skip, gas pedal pedal helps it. All input welcome. My new best is 2:02 at NOLA. |
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#2
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I build race cars ![]() ![]() ![]() ![]() ![]() Group: Advanced Members Posts: 4,748 Joined: 31-August 05 From: Central coast, CA Member No.: 874 ![]() |
With Toyo/Hoosier/Yokohama, starting cold pressures of 21-26psi are typical. YMMV. Too much and they'll feel nice and crisp at turn in, but start sliding after a few laps and turn to grease. When pressures are right, turnin may feel soggy, even after they are up to temp, but the grip will be consistent for the rest of the session. A tire pyrometer is a good tool to have in your box, but like a lot of things there is a learning curve to get thru before it's useful.
Sidewall rollover is less useful a tuning tool for race rubber, they typically have much stiffer sidewalls than a street tire and won't roll much in the useful range of pressures. |
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