07-21-2009
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#1
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Join Date: Oct 2005
Location: The land of the next-gen HMMWV
Drives: A BMW
Posts: 1,875
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Drivetrain whirr on deceleration
I've heard this described as the "wub wub" sound, the whirring that happens on decel. It seems to be getting louder in my 1g.
I've heard that using some shims on the front or rear carrier bearing could help, to correct the driveshaft angle. Has anyone had success with this? Or is the problem that i've got a worn out rear end?
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Style's automotive engineer
Sponsored by DB Performance (dbptuning.com)
A dsm, a bimmer, a DORGE CUMMINZ, and a non running DSM race car... for now.
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07-22-2009
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#2
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Join Date: Nov 2005
Location: Cottage Grove
Drives: Silver '02 IS300, Blue '06 Suzuki SV1000
Posts: 5,293
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Re: Drivetrain whirr on deceleration
If it sounds like it's coming from the back of the car it's probably your differential.
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'02 Lexus IS300
'06 Suzuki SV1000: Back on the road and ripping hard as ever!
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07-23-2009
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#3
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Join Date: Oct 2005
Location: The land of the next-gen HMMWV
Drives: A BMW
Posts: 1,875
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Re: Drivetrain whirr on deceleration
how can I tell for sure?
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Style's automotive engineer
Sponsored by DB Performance (dbptuning.com)
A dsm, a bimmer, a DORGE CUMMINZ, and a non running DSM race car... for now.
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07-23-2009
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#4
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Join Date: Sep 2008
Location: Minni-snowta
Drives: 07 Eclipse GT
Posts: 290
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Re: Drivetrain whirr on deceleration
Post the specs of your car so peeps can make better educated guesses. Miles, lube history, etc, etc too.
It's hard to get under a moving car with a stethoscope to check every little thing.
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07 Eclipse GTV6 Deep Red Pearl, cosmetic and weight reduction mods in progress, suspension and brakes come in Spring 2009. I want an LSD for the 5 speed auto!!
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07-23-2009
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#6
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Join Date: Nov 2005
Location: Cottage Grove
Drives: Silver '02 IS300, Blue '06 Suzuki SV1000
Posts: 5,293
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Re: Drivetrain whirr on deceleration
Another thing you can do is unbolt your driveshaft from the diff, and try to turn the input shaft. If you can turn it more than a few degrees before the wheels start to turn, it's worn out.
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'02 Lexus IS300
'06 Suzuki SV1000: Back on the road and ripping hard as ever!
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07-23-2009
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#7
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Join Date: Oct 2005
Location: The land of the next-gen HMMWV
Drives: A BMW
Posts: 1,875
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Re: Drivetrain whirr on deceleration
Quote:
Originally Posted by SnoEclipse
Post the specs of your car so peeps can make better educated guesses. Miles, lube history, etc, etc too.
It's hard to get under a moving car with a stethoscope to check every little thing.
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no kidding, thats why i'm a bit stumped.
93 talon tsi, 155k miles, bone stock, the Redline cocktail in the transmission, MT90 in the rear end (I think). Dont know a whole lot about the history as I just got it this spring.
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Style's automotive engineer
Sponsored by DB Performance (dbptuning.com)
A dsm, a bimmer, a DORGE CUMMINZ, and a non running DSM race car... for now.
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07-23-2009
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#8
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Join Date: Oct 2005
Location: The land of the next-gen HMMWV
Drives: A BMW
Posts: 1,875
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Re: Drivetrain whirr on deceleration
Quote:
Originally Posted by CarRacer
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I have read that thread, thats what caused me to think about the shimming. I'm just not completely convinced that hat is the problem... and why would it need shimming in the first place? Because of motor mounts being worn out or something? I'm not convinced those guys REALLY know whats going on, they're just guessing.
Nevertheless, I will probably end up trying that.
Is this a common noise? Anyone here ever had it in a car? Ever fixed it? I'm really looking for personal experiences here.
__________________
Style's automotive engineer
Sponsored by DB Performance (dbptuning.com)
A dsm, a bimmer, a DORGE CUMMINZ, and a non running DSM race car... for now.
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07-23-2009
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#9
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Join Date: Apr 2008
Location: Shakopee
Drives: 91 Galant VR4
Posts: 262
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Re: Drivetrain whirr on deceleration
The shims are to compensate for the carrier bearings wearing out. Some people try the window weld fix instead which doesn't seem optimal to me. The shims are easily reversable.
I have the noise in my car. It's loudest on a third gear decel. It's not that high on my list of stuff to fix, so I've learned to ignore it. I will be addressing it though and plan to use shims to do so.
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07-24-2009
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#10
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Join Date: Oct 2005
Location: The land of the next-gen HMMWV
Drives: A BMW
Posts: 1,875
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Re: Drivetrain whirr on deceleration
Cool, makes sense. I'm gonna give it a shot, i'll post my results.
__________________
Style's automotive engineer
Sponsored by DB Performance (dbptuning.com)
A dsm, a bimmer, a DORGE CUMMINZ, and a non running DSM race car... for now.
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10-28-2009
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#11
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Join Date: Oct 2005
Location: The land of the next-gen HMMWV
Drives: A BMW
Posts: 1,875
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Re: Drivetrain whirr on deceleration
shims didn't work. I tried about 4 different configurations, no dice.
__________________
Style's automotive engineer
Sponsored by DB Performance (dbptuning.com)
A dsm, a bimmer, a DORGE CUMMINZ, and a non running DSM race car... for now.
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