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The Tire Rack's Tire & Wheel Forum
Use this forum to discuss anything in relation to wheels to tires to offsets.
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Old 11-28-2012, 03:35 AM   #21
ajai
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Quote:
Originally Posted by Scooby24 View Post
Did you have an alignment performed after the coilovers? If not, that's a problem, for sure. If so, do you remember the specs? I'm also on BC Coilovers, full drop front to rear and as long as the temps are up, I have no problems at all on tires that are not as sticky as yours.
what psi u on?
Will camber setting affect tire psi needed? And do I need to increase psi in rain?
do u feel bc coilover is so stiff that the rear fly off and dsc goes on on bumpy road? and if soft, it bounce.
What setting is ur bc!?
Mine is front 16 from soft rear 13
Got any better ideas?
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Old 11-28-2012, 03:37 AM   #22
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My toe I remember is 0.1 toe out
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Old 11-28-2012, 03:46 AM   #23
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Quote:
Originally Posted by ajai View Post
My toe I remember is 0.1 toe out
If your car has toe out and your tires pressures are at what you said, it's no surprise your car feels unstable. Just set the alignment to the BMW specifications, and the tire pressure to what is listed on your door jamb or owners manual. If your mechanic can't do what you ask, time to move to another mechanic.

You may not be able to get the camber and caster to within specifications, but just have the alignment aim for equal measurements on both sides and to get as close to the BMW specifications as possible, and everything will be fine.
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Old 11-28-2012, 07:41 AM   #24
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My total toe is 0.2
Which left 0.1 right 0.1
Is that good or bad?
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Old 11-28-2012, 10:09 AM   #25
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seriously?

Psi = Pounds per square inch.

Pounds = lbs.

And you're low on air. 35 lbs per square inch is where you should be at. Clear now?


Sent from my SGH-I997 using Bimmer App
Thanks for advice . I am at 34 all around now.
The traction is better, and response is faster. But a bit lighter steering. Will 34 be too high for mine?
Also I see the door said font 2.9 bar and rear 3.4 bar. Is that psi or what?
I have 225/40/18 all around but front 18x8 rear 18x9
do I need to have different front and rear psi to make them balance??
Since the rear is a bit stretch.
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Old 11-28-2012, 12:58 PM   #26
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My total toe is 0.2
Which left 0.1 right 0.1
Is that good or bad?
Depends on whether your car has toe it or toe out. You want a small amount of toe in for stability.
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Old 11-28-2012, 01:03 PM   #27
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Thanks for advice . I am at 34 all around now.
The traction is better, and response is faster. But a bit lighter steering. Will 34 be too high for mine?
Also I see the door said font 2.9 bar and rear 3.4 bar. Is that psi or what?
I have 225/40/18 all around but front 18x8 rear 18x9
do I need to have different front and rear psi to make them balance??
Since the rear is a bit stretch.
no, bar is another unit for measuring pressure. I honestly figured in hong kong you'd be using bar or kpa since those are metric units of pressure.

really, you should be running around:
35psi = 2.41bar = 241kpa
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Old 11-28-2012, 03:32 PM   #28
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225 is a little too thin for a 9" wheel ideally speaking. It might be a slight issue but probably isn't causing the main issue.

Also, based on the picture of your car that I see, your car is lower than it should be for what is ideal handling geometry for the E46. There are long posts about this on M3forum.

Can you look up the part number tag of your steering rack? It will be on the steering rack itself. You may have the overboosted rack.

I think maybe it's a bunch of smaller issues adding up.

Last edited by Grande D; 11-28-2012 at 03:32 PM.
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Old 11-28-2012, 04:49 PM   #29
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225 is a little too thin for a 9" wheel ideally speaking. It might be a slight issue but probably isn't causing the main issue.

Also, based on the picture of your car that I see, your car is lower than it should be for what is ideal handling geometry for the E46. There are long posts about this on M3forum.

Can you look up the part number tag of your steering rack? It will be on the steering rack itself. You may have the overboosted rack.

I think maybe it's a bunch of smaller issues adding up.
im lowered with 225 on 9.5 and its super sticky so thats not why
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Old 11-28-2012, 05:17 PM   #30
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im lowered with 225 on 9.5 and its super sticky so thats not why
Uh huh. You have the optimal contact patch, and the best tire size for your wheel width. Where could I have gone wrong.

Last edited by Grande D; 11-28-2012 at 05:17 PM.
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Old 11-28-2012, 06:10 PM   #31
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Uh huh. You have the optimal contact patch, and the best tire size for your wheel width. Where could I have gone wrong.
he has 19's and by looking at his sig it seems im about that height
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Old 11-28-2012, 08:46 PM   #32
ajai
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Originally Posted by mkodama View Post
no, bar is another unit for measuring pressure. I honestly figured in hong kong you'd be using bar or kpa since those are metric units of pressure.

really, you should be running around:
35psi = 2.41bar = 241kpa
Big thanks!!! thanks for the calculation now I understand
But do I really need front and rear differednt psi? Or 35 all arou d is better
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Old 11-28-2012, 08:48 PM   #33
ajai
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Quote:
Originally Posted by zhp43867 View Post
225 is a little too thin for a 9" wheel ideally speaking. It might be a slight issue but probably isn't causing the main issue.

Also, based on the picture of your car that I see, your car is lower than it should be for what is ideal handling geometry for the E46. There are long posts about this on M3forum.

Can you look up the part number tag of your steering rack? It will be on the steering rack itself. You may have the overboosted rack.

I think maybe it's a bunch of smaller issues adding up.
Haha sorry forgot to mention. The picture is my old car. and it's photoshop drop.
u can find my car now in my other thread..
It's on 18 and it's not slammed
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Old 11-28-2012, 08:49 PM   #34
ajai
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I honestly forot the rack no, but it's in different oem model no from my memories. It's a Japan made BMW rack.
But it's oem
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