treimche

warmmilk

idk what temps they like as far as a number goes, but they definitely need a warm up lap and then you can beat on them till you run out of gas, no need to worry about overheating them... I've done track days on them in the high 90's, granted in a bit slower and lighter car, but they showed 0 fade.

DanielB

Not sure if I'd approach setting pressures that way. Rather, follow standard tire pressure turning techniques to run a few laps, come into the hot pits and immediately measure inner, middle and outer temps with a proper tire pyrometer. Measuring the surface with an IR gun isn't going to get you that far as the surface cools so quickly. You are looking for a linear temperature gradient across the tire. The actual temps don't really matter as those will be affected by the weather, track surface, how you drive, how your suspension is set up, etc. Candidly, the RS4 is a really forgiving tire and most people find that the optimum pressure is somewhere in the 34 - 38 psi range hot.

I'm on my second set of RS-4 running square 255 and aim for 38 front, 36 rear. That seems to give me the best wear with my setup. I can't feel any repeatable differences in grip moving the pressures around 1-2 psi so instead focus on optimizing wear.

freq

All of this. ^^^

treimche

Thanks for the suggestions. I'm new to the whole tire tech stuff. By the end of the day I was running my fastest laps with tires set to 29psi hot. Sounds like that is much lower than you suggest, but when I would check tire temps across the tire, 29psi was what got me the closest to even across the tires.

miamirice

DanielB

I have from Joe's but if I was to do it again, I'd spend the extra to get one that records the temps instead of you having to write them down. You want to measure all four tires as fast as possible and to do that with the low cost Joe's, you really need two people: one to take the measurements and call them out and the other to write them down.

miamirice