CosmosMpower

I'm looking for some information on tire pressures for autocross. Just picked up a set of 225/245 Hankook RS2's for the S on stock AP1 wheels. I was previously using a set of undersized 205/225 Kumho 712's that came on the car so i have no data on what pressures to run the new hankooks on.

Can anyone give some insight as to the best pressures to run with these? Suspension is stock with just the whiteline non-adjustable front sway bar. Car is an 00 model with 02 springs/shocks on it. Alignment is -1.5 front camber, 0 toe, 5 something caster in the front and -1.7 camber in the rear with 1/16th" toe in.

Ran a few events so far and the tires tend to get a bit greasy and need to be watered down every run. Air temps are around 95-100 in Texas, ground temps are probably 110-115 easily. I know quite a few people around here have run this setup and cold and target hot tire pressures would be helpful.

Thanks in advance

s2kennmark

wow we pretty much have the same alignment specs....

i have 225/45 17 fronts and 245/45 rears RS2... i've been running 31 fronts and 30 rears on concrete is good you can power through sweepers with little oversteer. A little squirly on asphalt though, since we run at some sites with elevation changes and 33f 32r works more for me. i havent tested a lot of tire settings yet since i have not driven my S for the last 4 events.

i also have from swaybar

CosmosMpower

Wow, that's considerably lower than I was running. I think I was at something like 36 all around and once they heated up i lowered the rear pressure back to 36 while the fronts expanded to 38 or so. I'm running the stock AP1 wheel though so mine are 16", not sure how much that matters.

Anyone else have any thoughts?

freq

I run the Hankook RS2 also but all of my numbers are road course. 32 cold and 39 hot.

CosmosMpower

39 hot front and rear? Is it ok to run the same temps front and rear on staggered sizes?

payneinthe

Why wouldn't it be?

freq

yes and yes I would imagine.

blanka98

Stinkytofu and myself run 36 psi hot at the track front and back with Nookies

CosmosMpower

Thanks I'll give that a shot next saturday. Last time I went 36 all around cold and as they heated up about 2-3 psi I bled some pressure out of the rear. Maybe I'll bleed 2-3 pounds out of the fronts and rears to stay 36 hot this time.

BTW do you guys see a need to water them down every run? Seems like they overheat easily at least here in TX when it's 100+ air temps