I put 30lbs...how many lbs is normal?

Inside the drivers door well it recommends 32 in the front tires and 29 in the back, thats what I use.

After much research on this board, I went with one person's favorite of 35f/32r. The ride is a little more stiff, but it feels much better.

32f/29r Winter
35f/32r Summer
38f/38r to 45f/45r Autocross

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I like 38 front, 35 rear.

I just got 215/45/17. What do you guys run during the summer and winter?

wow...38f/35r???

**** i only have 30f/30r...:confused:

Originally posted by occhy
I just got 215/45/17. What do you guys run during the summer and winter?

I ran 38f/35r in my Bridgestone RE730 215/45ZR17s (Summer only, I have dedicated Blizzaks for Winter). Pressures depend on sidewall. Stiffer sidewall = less rollover = lower pressures.

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Originally posted by KIMUTAKU
**** i only have 30f/30r...:confused:

Look inside your doorjam on the driver side for the pressures sticker. It says to go 32f/29r. That 2 pounds makes a lot of difference depending on the conditions.

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The listed pressure's in your door jamb are WAY TOO LOW. When I had the stock 92's I would run 40lbs. all around give or take 2 lbs. If you do any aggressive cornering with 32lbs. in the front you will notice that the tire is folding over and your running on your sidewall. Thats not good.

35 Ibs all the way around! And YES the factory door jam Ibs are WAY to low! Door jam level is for the Joe Shmo driver that doesn't do much hard cornering:devil:

Depends on the tires and the use....

when I'm wearing out the RE-92's that came on some 99 RS wheels, 35 all around.

With the 215-45-16 Azenis:
track: 38F 34R
street: 40 all around
this balances the wear

jack

Originally posted by 4or2wheels
The listed pressure's in your door jamb are WAY TOO LOW. When I had the stock 92's I would run 40lbs. all around give or take 2 lbs. If you do any aggressive cornering with 32lbs. in the front you will notice that the tire is folding over and your running on your sidewall. Thats not good.

Thank you. I gota add some air pressure ;)

Changing your driving style is probably better than just blindly adding air pressure. I switched to the higher pressures not because of rollover but because I simply liked a snappier feel. Even with the stock 32f/29r I never roll over during spirited driving. Smooth lines equals zero rollover under most circumstances.

My first autocross season, even when I was running 45f/45r, I still rolled over because I didn't know proper braking and cornering. Now that I've learned proper braking and lines, I can easily autocross on stock pressures and just barely roll over. I'll be slower but being smooth is more important than being fast when you're first starting out.

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Mine came 41f/40r from the dealer and I haven't made any adjustments yet and have never rolled over the sidewall arrows.

To find out if you really need more air, mark your tires with chalk or shoe polish. If you rub off the marks past the "safe" line, you need more air. Look at the marks on this tire and you'll see the pressures are absolutely dead on for the conditions of the track because the marks line up exactly with the rollover line (NHIS road course, November, 60 degrees, 38f/35r, Bridgestone RE730 215/45ZR17):

http://www.trunkmonkeyracing.com/Scrapbook/20011003-03-NHIS/640/or439994-11_na-NHIS.jpg

The fronts, however, had some rollover and should have been upped to around 40f:

http://www.trunkmonkeyracing.com/Scrapbook/20011003-03-NHIS/640/or439994-14_na-NHIS.jpg

And warm tires are gooey tires:

http://www.trunkmonkeyracing.com/Scrapbook/20011003-03-NHIS/640/or439994-08_na-NHIS.jpg

Of course, the pressures can be fine tuned further for desired performance handling but the rear marks show how to set pressures initially and then fine tune later.

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can anyone tell me whats the correct tire pressure for 225/40/18 tires in the summer


thanks

Should be the same pressures. There is no "correct," only what is correct for you driving. Experiment with it until you find something you like.

Despite what I said 3 years ago (eek), I have since moved on to 35f/34r

thanks gjhsu

ya i understand there is no correct pressure but i m just wondering what tire pressure
will be optimal for my tires in the sense of tire wear

cuz i understand the fact that too much or too little pressure will cause the tires to wear out a lot of quicker

I ran something like 44/42 in the RE92s...took out some of the wallow, but they just have very soft sidewalls...still, that was much better than the suggested placard pressures.

38psi/37psi F/R on my STI.

Ryan

38-40 all around feels much better to me.

dont forget that all tire pressure guages read different. I have seen them off by 5 or more PSI... :eek:

Sorry to bring up an old thread,but I had been running 35-38psi on my stock tires and just changed to 28 front/32 rear at a fellow owner's advice,and the steering actually feels great! Probably the added weight of the lower pressure helps,plus he said this is a good setup for weight transfer in straight-line acceleration.I first thought this was a weird setup,but it feels good.

36/36 Normal

40/40 Auto-X


You like oversteer, right?

I don't think I'll be getting much with my setup.

Sorry to bring up an old thread,but I had been running 35-38psi on my stock tires and just changed to 28 front/32 rear at a fellow owner's advice,and the steering actually feels great! Probably the added weight of the lower pressure helps,plus he said this is a good setup for weight transfer in straight-line acceleration.I first thought this was a weird setup,but it feels good.

28F? I hope you don't expect any resistance to hydroplaning at that pressure.

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=3

I don't think I'll be getting much with my setup.


I like to pretend that I get Oversteer.

28F? I hope you don't expect any resistance to hydroplaning at that pressure.

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=3

Thanks,I didn't realize that...I'll bump the fronts back up to 32psi and see how it goes.

Yikes..I went on the highway for the first time like that,and needless to say I'll be pumping those back up..I think I just liked the heavier steering feel,which was more like my Porsche,but everything else sucks.

I just got 215/45/17. What do you guys run during the summer and winter?

40/37 front/rear (cold) until about Nov 15. This has worked well with max performance tires (S03s and Goodyear F1s). The F1s need the pressure more than the S03s, although I ran those pressures high too. The trunk is lightened, the exhaust is lightened, I usually don't carry passengers, and 37 psi in the rear seems right.

I switch to Blizzack WS50s on stock wheels when summer tires are inappropriate. :alien:

.. just changed to 28 front/32 rear ... he said this is a good setup for weight transfer in straight-line acceleration.I first thought this was a weird setup,but it feels good.

No problem with "old thread", the RE-92s are still OEM, even for MY05, yes?

I surely can't say if those pressures would be any better for straight line acceleration--my intuition suggests the wouldn't---but I think you'll find hard cornering a much less pleasant experience. Braking might improve slightly, but gas mileage will suffer; and that is a more of a consideration for some folks these days.

Wow is 40+psi safe on these tires?? The max rated PSI on the side of the tire is 44psi. And the manual says to add 4.3psi to the cold pressure when they are warmed up (driven more than a mile). Is it safe to have so much pressure in them?

i have some random companies M+S tires and i run somewhere around 40-45 psi.

I did 35 front,32 rear.Haven't driven too hard around corners yet,but the ride is nice and steering feels right.A little quicker turn in than stock pressure up front.