AutoFreak57

iTrader: (3)

This will be useful info for when I get my rs3's...

bellwilliam

iTrader: (1)

Very surprising at some of the answers.

On big tires on narrower rim. I would go high 30s hot
On wide rim. I would go low 30s.
This is for rs3 and street tires in general.

I would run 5psi lower for rcomp


But u should use pyrometer to determine optimal psi.

tann3r

iTrader: (6)

Interesting mix of recommendations.

When I ran 225/45/15 RS3's on 15x8 wheels I ran 30psi front 28psi rear. Based off of pyrometer readings. those are hot pressures.

your numbers may vary to make slight balance changes. I'm on 750/450 AFCOs w/ RB 1.125" (soft) and FM 5/8" (med) w/ a splitter and wing.

02semiata

Thanks guys. That info has been helpful. I am running FCM with 450/325. I think 30-32 hot should work fine.

johnwag

iTrader: (3)

on your S2000......

We were running 31psi hot, in quan's NC, all of this last season.

start with a target of 31-32 psi

Sclippy96

This. If you are squeezing the 225 RS3s onto 7" wheels they will need a lot more pressure to be optimal than if you mount them onto 9" wide wheels. I run them on 7.5" wheels and usually have them at 35psi all around, I have seen run well on 9" wheels as low as mid 20's.

Faeflora

iTrader: (2)

In for updates since I am ordering these tires to put the powah to the ground

Nate99

FWIW, I just picked up a brand new set of these on 9" 6ULs. Two weeks ago at PIR I ran ~34 psi hot, and the tires were wearing to maybe an 1/8" above the arrows on the shoulders. That would suggest that 31-32 psi hot, as others suggested, would get me right down to the tips of the arrows. I don't have a pyrometer or anything, so that's about the best data I can contribute...

GIGAPUNK

I'm picking up my 225/45/15 RS3s and 15x9 Bronze 6ULs from Phils Tire Service in NY Saturday. First Porsche Club Autocross at Tobay for the season Sunday. I was running 29f/24r with my 225/50/14 Hoosier RS305s on 14x7s las season. I don't have a pyrometer. Any suggestions on an affordable probe style? I'll let yall know how it goes.

02semiata

See you there man

Joe_Mama

Feel wise I prefer ~36 psi HOT front and rear. 32 hot starts to feel too squirmy for my tastes.

Lower may be better for lap times but the feel bothers me.

GIGAPUNK

I just ran my first auto x on a set of 225/45/15 on 15x9 6ul. I chalked the tires a couple time at different pressures. Even at 30 psi cold there was ZERO shoulder wear. Even all the way down at 26psi cold and retarded sideways driving I only saw a light scrub maybe 1/8" down the sidewall.

02semiata

at 30 cold what did they go up to when hot

GIGAPUNK

At no point in the day was my hot temp even a full 2 psi over my cold.

02semiata

Cool. Thanks man. I need to hurry up and get mine mounted. I really need to look into getting more power this season also lol

GIGAPUNK

What class are you running in the SCCA and what engine mods are allowed?

02semiata

I run STR as for power mods just NA stuff nothing crazy. Anything FI would be SSM. A turbo miata with slicks and a good driver is hard to beat to be honest. Most of the time you would be trying for FTD and at that point who cares what class your in haha

Nate99

I can second this. I ran an autox this weekend and we ran my car in STR with the tires at about 30-31 hot, and we still weren't seeing wear past the tips of the arrows on the sidewall. The guy that co-drove my car is very fast, and he was pushing it pretty hard.

GIGAPUNK

I've done a ton of pyrometer testing the last two events and get the most even temps at 36 front, 31 rear, cold.

02semiata

I had no idea you were testing like that you should of let me be part of the test group haha. I am still running 32 hot all around and the car seems fine. At the PSI your running are you using all the tire meaning is it using the sidewall at all. I been using those little arrows on the side of the tire. I like to see wear on that arrow if I don't i feel the PSI is too high. Well let me know what you thing. Also what is your alignment settings