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Old 02-21-2008, 03:54 AM   #1
ccfc1927

Name: ccfc1927
Title: United Newb
Status: Offline
Join Date: Jan 2008
Location: Wales
Rate My Car: 189 / 340
Your Ride: 1992 325i
Smile Does anyone know the "correct" tyre pressures

I have a '92 325i on 17" alloys and I need to know the best tyre pressure. Ive been told different amounts by different garages (33fr/30r) (30fr/28r) I currently have 30fr/31r. I'd like some opinions on what other people have in similer cars please

Also another thing, has anyone ever experienced "tramlining" where the tyres follow the lines on the road as oppose to where your steering the car? If so, what could cause this to become very bad i.e. suspension componants worn etc. Ive had a look and everything looks ok with no cracked bushes etc. It's very annoying, the roads are crap where i live which doesn't help

Thanks in advance

Last edited by ccfc1927; 02-21-2008 at 03:57 AM..
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Old 02-21-2008, 05:24 AM   #2
Dudesky

Name: Dudesky
Title: Run Far
Status: Offline
Join Date: Apr 2005
Location: Jersey City, NJ
Rate My Car: 106 / 340
Your Ride: E39 530iA
I had the same car with the same size wheels not too long ago. Everyone will tell you different things about "correct" tire pressure. The truth is that even manufacturer's recommendations are only an average, because pressures change radically with temperature. You can be riding nicely in the morning, then be bouncing around like a rock by midday. But for what it's worth, here are my rules:

1. Don't exceed the max pressure written on the sidewalls, or the minimum pressure stated on the door jamb. Lower profile tires don't always need higher pressures- it's not an absolute; it depends on the tire composition.

2. Start with the pressures recommended on the door jamb, then adjust up by 1psi increments to get the best possible ride quality under the most common conditions. If it gets worse, back it down a little. You'll know it's right when the ride feels comfortable and the suspension feels like it's in tune.

As far as tramlining, it depends on the tire. Assuming of course, your suspension is good to go. Some will tramline worse than others. Some will resolve themselves after some wear has occured. And with many tires, an adjustment in pressure can also resolve it, so factor that in when you dial in the optimum pressure.
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Old 02-21-2008, 06:49 AM   #3
ccfc1927

Name: ccfc1927
Title: United Newb
Status: Offline
Join Date: Jan 2008
Location: Wales
Rate My Car: 189 / 340
Your Ride: 1992 325i
Thanks, appreciate it
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Old 02-21-2008, 07:34 AM   #4
denyo77
 
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Name: denyo77
Title: Suspended License
Status: Offline
Join Date: Jun 2007
Location: Germany
Rate My Car: 198 / 340
Your Ride: 1988 325i Touring
hey, Dudesky, haven't seen you in a while
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Old 02-21-2008, 07:50 AM   #5
Dudesky

Name: Dudesky
Title: Run Far
Status: Offline
Join Date: Apr 2005
Location: Jersey City, NJ
Rate My Car: 106 / 340
Your Ride: E39 530iA
meh. I'm alive. I pop my head in once in a while. Been working 2 jobs lately and still finishing school.
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Old 02-21-2008, 02:40 PM   #6
nick_318is
 
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Name: nick_318is
Title: Suspended License
Status: Offline
Join Date: Jul 2005
Location: Detroit, MI, I Heart E30s
Rate My Car: 10 / 340
Your Ride: 1991 318is (e30 m42), 2007 Mazdaspeed 3
I would go with the door jam for starters. As far as tramlining I have had it happen from time to time and I don't think its completly uncommon. I run my 17s at 35psi all around on the e30.
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