whats the best tire pressure{hot} with the stock tires ,on the road coarse?

 

I find that the car is squirrely if I let the pressures go to or over 40, and most comfortable at about 38/37 or a hair lower. I usually start with them at 32 and check them after each session. Unfortunately the pressures give up a little on a cool down lap so unless you get a pressure reading in the hot pit after a hard lap it is bit of a guesstimate.

Some of this will vary depending upon the car, tires, driver, track, and temprature.

 

I used to run 32R/34F cold on S02s.

 

I also start at 32 cold. If I start out with pressure above that, especially in the rear, I can't get the rear to stick.

 

How about autoX. I've been running 36 to 38 evenly, on a non S2K drivers advice. Anyone have a suggestion for me (stock S02's)?

 

Actually, I was referring to autocrossing on OEM S02s. Anytime I've started higher than 32 PSI, I can't get them to stick. I'm pretty certain that 36 would be way to high to start (for my driving style). The pressure will rise to 36 or so once they are hot, but they shouldn't be 36 cold.

 

Autocross pressures. 38~35 front / 32~30 rear (of course this depends on the temp of the track etc....)


Dale

 

My rear end won't stick at all at 32 psi. I run it at 34. It makes a big difference, surprisingly. I run the fronts at 37. I'm actually thinking of increasing the rear pressure.

At 35/32, I got ugly oversteer. At 35/34, I got friendly understeer. At 37/34, it seems just about right. It's a little oversteery, but quite controllable, a little understeery at really slow speeds due to the lack of engine braking at low RPM's. This is while running -1.75deg front and -1.5 rear on stock S-02's. I actually started at 37/34 on a racer's advice and the car handled great that day (I don't think there were any street-tire cars faster than me, but it was a practice day and I didn't see all the times, and they weren't posted), but I had to try and be smart and experiment and I don't get another chance to run until september.

My impression was also that the tires tend to overheat fast. Anyway, I had a lot of trouble equaling my early times, but then again I was letting my tire pressures get all over the map, so that may have been my problem.

Robin.