Quote:
Originally Posted by sperry
Also note that perfectly even temps across the tire may indicate too little negative camber for ultimate cornering grip. Straight line braking will heat the inside of the tire more than the outside, and cornering will heat the outside more than the inside. You may be able to pick up more overall cornering at a slight expense to outright braking ability, and go faster over-all with hotter inside temps. The only real way to know is to have real-time telemetry of tire temps during the run and figure out where you're losing time, but sometimes if you play with it a bit, you'll be able to sort it out w/ trial and error. But if Rusty says "it looks good", it's probably pretty dialed, he did a pretty good job w/ my setup.
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Scott's initial comment is correct, but there is more to it, and I'm not sure real time data helps for initial setup.
In addition to braking, turning the other way also raises inside temps, so a skid pad is the only real way to get cornering contact patch related tire temp info. Cold tires, run 5-10 even no under-oversteer laps. Slow to a stop quickly but with minimal braking, Check temps accross outside tires. Let tires cool. change pressure, repeat.
Given this weekend's courses, I would expect about 10-20 degree hotter or maybe more inside temps in the front on a good clean minimal understeer run. Rear I don't care about much as they get adjusted to overall car feel rather than ultimate grip at that end in most cases. A straight progression is about right to me most of the time.
Outside = X, center = X+n, inside = X+2n where n is in the 5-10 maybe 15 range. It's actually a whole lot more complicated than that, but that is a good starting place for autocross at least.