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Old 11-04-2009, 02:21 AM   #21
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38 each corner

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Old 11-04-2009, 03:54 AM   #22
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I'm also running 38psi cold for each wheel on the OEM 19s with Goodyear F1 Asymmetric tyres.

I find that your ideal pressures will depend a lot upon the tyres you run (how hard their sidewalls are) etc, how tall the sidewall is...

Running different pressures F/R will help cause/prevent understeer/oversteer, usually if you have it higher at the front and lower and the back you will cause less understeer and vice versa. Although I've only ever really noticed 2psi differences F/R on the track where you're really pushing the car to it's limits.

If you're finding your car to understeer, then there's a few techniques you can use to help cure this, like trail braking into corners, left-foot braking etc. My personal opinion is that these would make much more of a difference than tyre pressures...

If it's oversteering, which probably isn't likely in a BMW, then it would most likely just be down to how early and how smoothly you're putting the power down when you come out of a corner...

I found that my old S2000 was quite sensitive to tyre pressure changes compared to the M3, I just set it at 38psi all around and leave it, on track though I run about 44psi cold F/R.
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Old 11-04-2009, 04:56 AM   #23
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low profile tyres should be run at 38+ psi
normal profile just go by ur tyre placard.

and do your pressures with cold tyres, not after uve been driving for 10 mins as the pressures increases as the tyres warm up.
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Old 11-04-2009, 05:15 AM   #24
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standard car and standard suspension i dont think it would matter, anything between 33-40psi.

low profile tyres, bit more pressure.

i use to run different pressures in an awd, just to get more traction to the front end, but now you really wont notice it on the street.

having tight steering in the beemer feels good, so keep em all around 38psi
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Old 11-04-2009, 07:39 AM   #25
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40F and 38R 19" on Goodyear F1 Asymmetrics, less understeer which is what I prefer.
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Old 11-04-2009, 06:20 PM   #26
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32 psi all around...
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Old 11-04-2009, 06:25 PM   #27
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40F and 38R 19" on Goodyear F1 Asymmetrics, less understeer which is what I prefer.
I'm glad I read your post because I used to be under the impression that lowering front pressures would help the front dig in more, as softening the suspension, sways etc. does. But as it turns out it's actually around the other way with the pressures...so higher pressure = more grip basically right?

BTW how are you finding the tyres?
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Old 11-04-2009, 07:02 PM   #28
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TAAXED - i was under the impression that less pressure = more grip..
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Old 11-04-2009, 07:05 PM   #29
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So was I...but I just looked around on a few websites and it seems that we're not correct...softening front suspension, sway bars etc. will create more front end grip and adding some front toe-out will give you better turn in (but your car will get tugged left and right on small imperfections in the road)
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Old 11-04-2009, 07:28 PM   #30
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^ hmm I might try 38 all round then. I hate the way it has a little understeer tendency in some corners. If I wanted a FWD, I would have bought a Civic!

Vtec yo!
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Old 11-04-2009, 08:00 PM   #31
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TAAXED - i was under the impression that less pressure = more grip..
Same, they did a top gear thing on this from memory.
The only time more pressure = more grip was on salt.
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Old 11-04-2009, 08:07 PM   #32
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Yeah on their road trip to America, that's more related to traction, not grip...two different things...

I'm confused about the whole thing now, only way to work it out is to test it!
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Old 11-04-2009, 08:43 PM   #33
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All depends on the rubber as well with tyre pressures and grip on turn in. No point in comparing pressures on a Potenza RE555's, Direzza, Cup Sport or R888 with what you run in a road tyre.
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Old 11-04-2009, 09:06 PM   #34
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Same, they did a top gear thing on this from memory.
The only time more pressure = more grip was on salt.
I thought the same...

I remember when I went 4wd'ing in the saudi desert the drivers all let half the air out of their tyres (not that that is really relevant to driving on tar though).
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Old 11-04-2009, 09:17 PM   #35
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Old 11-04-2009, 10:22 PM   #36
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I'm glad I read your post because I used to be under the impression that lowering front pressures would help the front dig in more, as softening the suspension, sways etc. does. But as it turns out it's actually around the other way with the pressures...so higher pressure = more grip basically right?

BTW how are you finding the tyres?
I researched this a while back, obviously lowering pressure will increase grip if we are talking straight line.

But when cornering, it reduces the stiffness of the sidewalls since E46 are inherently understeery, reducing the rear pressure helps alleviate this somewhat.
Lots more mucking around to do when I buy some sways + coils.

These tyres are awesome for street, I run out of balls before the tyres even thinks about giving up.
Great in the wet, incredible in the dry, and predictable when it does lose grip, well worth the money IMO.
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Old 11-04-2009, 10:23 PM   #37
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I thought the same...

I remember when I went 4wd'ing in the saudi desert the drivers all let half the air out of their tyres (not that that is really relevant to driving on tar though).
Yeah they also let all the air out of the tyres in the Arctic Adventures one when they were going through the softer snow...
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Old 03-22-2010, 05:10 AM   #38
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Damn! Why so high?

I run 32psi all around in mine.
lol 40 is too high indeed. i run 32s F 33s R
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Old 03-22-2010, 07:18 PM   #39
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I changed to 37 all round on 17s and am enjoying that so far. Reduced tramlining, comfortable and firm enough ride too.
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Old 03-22-2010, 08:44 PM   #40
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Wow, this thread is back from the dead again, and still running 38-40 PSI
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