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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Decrease in Ride Quality



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      11-30-2006, 03:33 PM   #1
DrPowers
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Decrease in Ride Quality

I've noticed a decrease in ride quality over the last several months. I bought the car in late march and it seemed to ride well. I then got a flat tire and it seemed that my car rode poorly ever since.

I can feel EVERY crack in the road no matter how small it is.

Before you say anything... I dont have RFTs anymore. They were cupping and because I thought they were part of the problem I had them replaced. I now have 16" Bridgestone Potenzas. After changing tires I noticed negligible difference in the ride quality. I even had the wheels realigned... which is expensive through BMW btw.

Another note... it seems like the problem is escalated when the outside temperature is low and I'm driving in a lower speed.

I'm looking for any information or comments about this problem. Is it all in my head or is there something obvious that I should be looking for.
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      11-30-2006, 04:10 PM   #2
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Check your tire pressure.
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      11-30-2006, 04:12 PM   #3
DrPowers
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Quote:
Originally Posted by obLu
Check your tire pressure.
What is the recommended psi for front and back?

Edit: I have heard different things from Bridgestone and BMW

Last edited by DrPowers; 11-30-2006 at 11:07 PM.
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      12-01-2006, 09:17 AM   #4
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I checked the PSI and it was close if not spot on the recommended amounts in the door jam.


Any other ideas???
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      12-01-2006, 09:22 AM   #5
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j/k ... Seriously, I can't think of anything else. Perhaps the OEM tire pressures specs are not suitable for your non-RFT potenzas.
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      12-01-2006, 10:13 AM   #6
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i think you will have to experiment with pressures as the non runflats wont be the same pressure as runflats that are shown in door jam.
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      12-01-2006, 07:19 PM   #7
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Quote:
Originally Posted by ROCKETRON
i think you will have to experiment with pressures as the non runflats wont be the same pressure as runflats that are shown in door jam.
So as a guide.... does a higher PSI make the ride rougher?
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      12-01-2006, 07:59 PM   #8
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Quote:
Originally Posted by DrPowers
So as a guide.... does a higher PSI make the ride rougher?
Yes.

As a general rule - too low and the steering feel may seem a bit mushy, plus the sidewalls will take the brunt of the weight of the car (and as a result, could heat up and lead to tire failure in the worst case). Too high and the ride will be harsh.
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      12-02-2006, 03:13 AM   #9
DrPowers
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I'll try that out tomorrow... I also noticed in some reviews of the Potenza G009 that they were notorious for a very rough ride.
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      12-02-2006, 09:37 PM   #10
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Ok so I dropped the PSI to 25 front and 30 back... same deal. I then brought it back up to 29/ 35.

I did notice that there is a wobbly? feeling from the front left wheel. Could one of the suspensions be out of wack?

Any other ideas...
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      12-03-2006, 12:17 AM   #11
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Unbalanced tire? Could you have lost some of the tire weights?
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      12-03-2006, 10:40 PM   #12
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Quote:
Originally Posted by BK
Unbalanced tire? Could you have lost some of the tire weights?

I just had the tires put on... got rid of those run flats... they were balanced then.

Does the suspension get stiffer with use?
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      12-07-2006, 08:30 PM   #13
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Quote:
Originally Posted by DrPowers
I just had the tires put on... got rid of those run flats... they were balanced then.

Does the suspension get stiffer with use?
No, but it does get stiffer as it gets colder.
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      12-07-2006, 10:29 PM   #14
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The bushings on BMWs are notorious for stiffening when the ambient temperature gets cold.
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      12-09-2006, 12:37 AM   #15
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how cold is cold???? I kindof notice this happening at temperatures around 40 deg C.

It also seemed to go away when the car warmed up.
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      12-11-2006, 01:21 PM   #16
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Just an update: The ride does seem to get better after about 5 min of driving.

The "wobbling" stops after the car seems to warm up. could this be a characteristic of a bad bushing?
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      12-11-2006, 02:38 PM   #17
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How cold is cold btw? Sounds more like tire flat spotting from sitting out in the cold.
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      12-12-2006, 08:50 AM   #18
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Quote:
Originally Posted by obLu
How cold is cold btw? Sounds more like tire flat spotting from sitting out in the cold.

Even for brand new tires? They dont sit out for any more than overnight. I drive this car daily.
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      12-12-2006, 01:35 PM   #19
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Just a couple hours can do it if it's cold out. Mine vibrate a little in the morning if I leave my car outside. Only hits mid to low 30's here.
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      12-12-2006, 07:09 PM   #20
DrPowers
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Quote:
Originally Posted by obLu
Just a couple hours can do it if it's cold out. Mine vibrate a little in the morning if I leave my car outside. Only hits mid to low 30's here.


Is this happening to anyone else?
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      02-09-2007, 02:42 PM   #21
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I get some flat-spotting vibration the first few minutes of driving this E90, previous BMW's, and a Saab, so I guess it's pretty normal.

I drive a variety of vehicles (full size truck, Tacoma, BMW, Saab) and I think sometimes the more time you spend in a smooth riding car, the more you think the ride quality is bad. When I get out of the Ram and into the BMW, it's like it's a cushy Cadillac. But then after a while in it I'm thinking the same thing....it's not as smooth as before. Any chance you're just getting more attuned to the stuff that does come through from the road surfaces?

Also, as your tires wear I have always felt that the ride is less smooth.

I see that you are on 16" wheels/tires. That means you are probably wanting as smooth a ride as possible, at the expense of some grip and handling. I have 18's on now and the 16's (even runflats) were pretty smooth riding to me.
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      02-09-2007, 02:48 PM   #22
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it's because you have bridgestones. they have poor wear characteristics, deformation issues, and develope flat spots very easily. remember, this is the same company as firestone... the infamous tire exploders.
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