Intermittent Vibration from the rear ?
08-01-2009, 06:46 PM
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Hey...
So, I have a minor vibration that comes from the rear - but it comes and goes. I have ASA R1 rims in a staggered setup... 245/18 up front and 265/18 in the rear, IIRC. PSI called for is 33 rear, 30 front stock.
So, at speeds between 60 mph and roughly 80-85 mph, I have a vibration sometimes, and other times the car feels like it is on glass it is so smooth... this on/off with the vibration can come/go within a moment or two. Of course I am going to take it in to the local BMW specialist, but I figured I'd query the collective. It also seems - and I could be wrong - that it is pavement specific. When I'm on silly smooth pavement, it is always silly smooth.
Is PSI correct for the staggered setup?
Is there a known wear item that can cause such a vibration?
The front end is rock solid, nothing. Like glass. It is just the rear.
Assumption: Since it comes and goes, I assume it is not the tires or rims, if they are out of true or balance, they are out all the time. I hate to characterize the issue, but it seems more of a "harmonic", than a "vibration", if that makes sense. Which is why I'm wondering suspension or chassis wear part?
Thanks for any guidance.
Barry
So, I have a minor vibration that comes from the rear - but it comes and goes. I have ASA R1 rims in a staggered setup... 245/18 up front and 265/18 in the rear, IIRC. PSI called for is 33 rear, 30 front stock.
So, at speeds between 60 mph and roughly 80-85 mph, I have a vibration sometimes, and other times the car feels like it is on glass it is so smooth... this on/off with the vibration can come/go within a moment or two. Of course I am going to take it in to the local BMW specialist, but I figured I'd query the collective. It also seems - and I could be wrong - that it is pavement specific. When I'm on silly smooth pavement, it is always silly smooth.
Is PSI correct for the staggered setup?
Is there a known wear item that can cause such a vibration?
The front end is rock solid, nothing. Like glass. It is just the rear.
Assumption: Since it comes and goes, I assume it is not the tires or rims, if they are out of true or balance, they are out all the time. I hate to characterize the issue, but it seems more of a "harmonic", than a "vibration", if that makes sense. Which is why I'm wondering suspension or chassis wear part?
Thanks for any guidance.
Barry
08-01-2009, 07:57 PM
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Originally Posted by barry325' post='962406' date='Aug 1 2009, 10:46 PM
When I'm on silly smooth pavement, it is always silly smooth.
Do you get thumping under your seat? How does the vibration manifest.....where in the car do you feel it?
08-01-2009, 08:02 PM
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My Ride: 2007 530i. Purchased 6/28/07. Titanium Silver Metallic, Black Dakota Leather, Dark Poplar Trim, Steptronic, Premium Package, Cold Weather Package, Bluetooth, Adaptive Control Xenons. 10/30/07 Added OEM 124s with 245/40/18 & 275/35/18 Michelin Pilot Sport A/S tires. Installed red Cal Covers� from BavAuto. 11/21/07 Added OEM all-weather floor mats (for winter, carpet in summer) and coat rack. 6/26/08 installed M5-style rear spoiler. 6/30/08 put on red reflectors. 8/22/08 Euro turn signal stickers applied. 3/20/09 Installed Shadowline Trim. 3/27/09 Added Matte Black Kidney Grilles from Trinity. 4/03/09 Installed Bimmian Shadow Matte Black 530i Badges. 4/04/09 Installed LED license plate lights from Trinity. 5/01/09 Installed Brabus Interior LED Kit and White Angel Eyes. 5/02/09 Put in Brabus 6K Fogs. 5/14/09 Removed charcoal filter. 5/15/09 Installed light smoke LED side marker lamps from Trinity. 5/21/09 Sprint Booster. 6/12/09 Painted exhaust tips flat black. 6/13/09 Pulled red Cal Covers and painted calipers low gloss black. 6/27/09 RPI Ram Air Scoop from Trinity. 8/15/09 Installed Brabus's silver invisibulbs front and rear. 9/24/09 Installed R-Dash license plate LEDs from Brabaus (John).
Originally Posted by DrLev99' post='962469' date='Aug 1 2009, 10:57 PM
Do you get thumping under your seat?
08-02-2009, 07:16 PM
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Hey....
Yup, meant SIIIIIIILLY smooth. Like glass.
Running a hub-ring supplied by TireRack with the rims.
Definitely the rear. Feel it in the seat, not the steering wheel. It is most definitely the rear.
Also, filled up with gas today, that seems to "damp" it.
Barry
Yup, meant SIIIIIIILLY smooth. Like glass.
Running a hub-ring supplied by TireRack with the rims.
Definitely the rear. Feel it in the seat, not the steering wheel. It is most definitely the rear.
Also, filled up with gas today, that seems to "damp" it.
Barry
08-02-2009, 07:23 PM
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Are they the plastic kind of aluminum? Some have more success w/ the plastic.
Originally Posted by barry325' post='963356' date='Aug 2 2009, 08:16 PM
Hey....
Yup, meant SIIIIIIILLY smooth. Like glass.
Running a hub-ring supplied by TireRack with the rims.
Definitely the rear. Feel it in the seat, not the steering wheel. It is most definitely the rear.
Also, filled up with gas today, that seems to "damp" it.
Barry
Yup, meant SIIIIIIILLY smooth. Like glass.
Running a hub-ring supplied by TireRack with the rims.
Definitely the rear. Feel it in the seat, not the steering wheel. It is most definitely the rear.
Also, filled up with gas today, that seems to "damp" it.
Barry
08-03-2009, 03:43 AM
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Originally Posted by barry325' post='963356' date='Aug 2 2009, 11:16 PM
Hey....
Yup, meant SIIIIIIILLY smooth. Like glass.
Running a hub-ring supplied by TireRack with the rims.
Definitely the rear. Feel it in the seat, not the steering wheel. It is most definitely the rear.
Also, filled up with gas today, that seems to "damp" it.
Barry
Yup, meant SIIIIIIILLY smooth. Like glass.
Running a hub-ring supplied by TireRack with the rims.
Definitely the rear. Feel it in the seat, not the steering wheel. It is most definitely the rear.
Also, filled up with gas today, that seems to "damp" it.
Barry
Barry
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