Tire pressure for the Cup2 tire at the track??
#16
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Originally Posted by TRAKCAR
This means starting 22-24 on a cold day..
So to be a bit on the safe side and to keep the TPMS happy, start at 26 and bleed down to 32 after a few laps.
So to be a bit on the safe side and to keep the TPMS happy, start at 26 and bleed down to 32 after a few laps.
#17
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TRAKCAR is spot on in his suggestion.
In medium temps (17-23 celsius) I usualy find the cold pressures to go up by 0,5 bar (7psi) during a session. So aiming for a 30-32 psi hot window 24/25psi starting point seems optimum.
Once or twice went too low with the cold pressures and that results in an uncomfortable combination of overheated underinflated tires.
Wish there was a tire temp indicator on dash like the one in M4GTS. Getting the tire pressures and temps spot on is essential for an enjoyable track experience.
In medium temps (17-23 celsius) I usualy find the cold pressures to go up by 0,5 bar (7psi) during a session. So aiming for a 30-32 psi hot window 24/25psi starting point seems optimum.
Once or twice went too low with the cold pressures and that results in an uncomfortable combination of overheated underinflated tires.
Wish there was a tire temp indicator on dash like the one in M4GTS. Getting the tire pressures and temps spot on is essential for an enjoyable track experience.
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LZRD GRN (05-26-2020)
#21
Instructor
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+1 for what Trackcar said...
I run 30psi hot on tracks with slower corners and 32psi hot on tracks with faster corners, just like the extra sidewall support...
Also agree about the TPMS warning lights that you get if you start below 26psi...you could start at 26, then keep bleeding after each session if the warning light bothers you, or just deal with the light like I do.
I run 30psi hot on tracks with slower corners and 32psi hot on tracks with faster corners, just like the extra sidewall support...
Also agree about the TPMS warning lights that you get if you start below 26psi...you could start at 26, then keep bleeding after each session if the warning light bothers you, or just deal with the light like I do.
#22
Race Car
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+1 for what Trackcar said...
I run 30psi hot on tracks with slower corners and 32psi hot on tracks with faster corners, just like the extra sidewall support...
Also agree about the TPMS warning lights that you get if you start below 26psi...you could start at 26, then keep bleeding after each session if the warning light bothers you, or just deal with the light like I do.
I run 30psi hot on tracks with slower corners and 32psi hot on tracks with faster corners, just like the extra sidewall support...
Also agree about the TPMS warning lights that you get if you start below 26psi...you could start at 26, then keep bleeding after each session if the warning light bothers you, or just deal with the light like I do.
If it helps make people more comfortable - PSDS at Barber last week had TPMS lights on all cars in the AM and simply said to ignore it. Temps came up during the day as you'd expect. If they're good with it, I am too.
#23
Intermediate
Join Date: Jun 2010
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I was doing 30/30 at Sebring, but found the rear rolled a little much. Bringing the rear up to 32 did the trick. RE the warning light, after the first run, when you come in with hot pressure, set the Circuit to the current pressure as target, remembering to say YES every-time you start the car, and the warnings will no longer bug you. (camber at 2.5 front, 2.25 rear)
#25
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Surprised to see in the Sportauto article of the Manthey Racing GT3 RS that they ran 1.8bar/26psi hot pressure allround. Seems extremely low and would mean triggering the warnings. Wonder if this was a mistake or truly best for minimum laptime.
#27
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just need to remember they need to be warmed up to pressure again after an extended pit stop, and also that you need to put the air back in before driving home!
#29
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No one that have any comments on this advices from Michelin?
#30
Race Director
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I pretty much folllow what Michelin says. I don’t have the roll over and outside wear issues others have. I’m runing -1.7 camber. I start at 28 front and 30 rear...bleed down from there to running 33 front 35 rear hot.