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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, May-13-2013, 08:36:32 PM   #21
paffy
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Default Re: differential whine

Update:

Took the diff out and opened it up. Measured the backlash at 10 or 11/1000 inch. That seemed like a lot to me. The wear pattern looks reasonably OK on coast side and not so good on the drive side.

I also found a piece of small metal shaving. The front bearing is shot, so it's probably from there.

Took it to my installer who said Turner sets the backlash at 10-15/1000 and will claim improper break-in if I try to warranty it.

I drove the car for 70 miles at 75-85 mph on highway non-stop right after the install so there might be something to it.

I've decided not to fight about this with anyone. I will get the pinion bearings (cheap) and fix this myself, setting it at 3/1000 backlash and we'll see.
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Old Mon, May-13-2013, 10:52:55 PM   #22
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Default Re: differential whine

Paffy, who's your installer? And to clarify, the "rebuilt" diff from Turner did not have a fresh pinion bearing in it? I can PM if you prefer.
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Old Sat, Dec-22-2018, 07:16:24 PM   #23
chsbmw
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Default Re: differential whine

Bringing this one back... 10K miles ago I had the diff bushings replaced with polys (part of a rear end refresh/reinforcement) which caused light whine on highway speeds but none under 65mph. Just had the diff rebuilt (to address clunking) and the whine has gotten significantly worse. Itís even there at low speeds and whines during both accel and decel. Left the car with the shop which will have the diff sent back to the rebuilder. Stock gearing and everything. Any recommendations?


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Old Sat, Dec-22-2018, 07:46:42 PM   #24
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Default Re: differential whine

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Originally Posted by chsbmw View Post
Bringing this one back... 10K miles ago I had the diff bushings replaced with polys (part of a rear end refresh/reinforcement) which caused light whine on highway speeds but none under 65mph. Just had the diff rebuilt (to address clunking) and the whine has gotten significantly worse. Itís even there at low speeds and whines during both accel and decel. Left the car with the shop which will have the diff sent back to the rebuilder. Stock gearing and everything. Any recommendations?


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Yeah lose the ploy bushings. The whine thought. Might be bad pinion to ring mating.
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Old Sat, Dec-22-2018, 08:29:01 PM   #25
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Default Re: differential whine

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Originally Posted by HassanEido View Post
Yeah lose the ploy bushings. The whine thought. Might be bad pinion to ring mating.
Thanks. Go OEM or solid? Car has monoball rtabs, poly subframe, fcabs and OEM transmission/engine mounts.
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Old Sat, Dec-22-2018, 08:39:41 PM   #26
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Default Re: differential whine

Quote:
Originally Posted by chsbmw View Post
Thanks. Go OEM or solid? Car has monoball rtabs, poly subframe, fcabs and OEM transmission/engine mounts.
Oem diff bushings would get my vote always
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368.4 whp 289.1 wtq

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Old Tue, Dec-25-2018, 10:15:46 PM   #27
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Default Re: differential whine

I have PowerFlex race bushings on my 3.91 and it whines a good bit off throttle on the highway. Planning to go back to OEM soon.
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Old Tue, Dec-25-2018, 10:24:04 PM   #28
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Default Re: differential whine

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Originally Posted by E46Hoonigan View Post
I have PowerFlex race bushings on my 3.91 and it whines a good bit off throttle on the highway. Planning to go back to OEM soon.


Thatís good to know thanks. Diff is going back to the builder this week. Want it corrected where the whine goes back to how it was prior to rebuild and then will contemplate on going the OEM route.

Perhaps going back to OEM will help with the thump as well. Shop is throwing on a new DM flywheel to see if that helps with the clunk/thump. Takes away from the whole driving experience.


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Old Tue, Dec-25-2018, 10:37:37 PM   #29
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Default Re: differential whine

I've always been curious -- what exactly is it about the poly bushings that cause the diff to whine when letting off the throttle? I assume that the whining is coming from certain contact of bearings/parts inside the diff rather than the actual bushings themselves, and the way in which they contact each other to cause the whine has to do with the stiffness of the bushing?

I get that people use stiffer bushings like poly to minimize drivetrain power losses (maybe also in some cases easier install), and choose to put up with diff whine for performance reasons, but does the whine of the diff in these situations not indicate that it's possible that the diff is experiencing wear that it wasn't designed for which may cause problems down the line? I get that people have been using poly bushings on these cars for a very long time and can probably answer that last question in the negative, but I'm still curious about how much "exact" understanding of the whine exists.

FWIW I also recommend OE bushings, but good f***ing christ is replacing the OE front diff bushing an absolute nightmare. Took at least a full day of hammering, thinking, pleading, crying, and I couldn't really find a writeup anywhere that detailed a good surefire way to efficiently get the old one out and the new one in, at least not with the subframe still on the car..
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Old Thu, Dec-27-2018, 05:47:36 PM   #30
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Default Re: differential whine

Don't all diffs whine and the poly bushings just transmit the noise better?
I have OE bushings and after installing the Mason brace, I can hear the diff whine with the seats down at highway speeds.
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Discussing differential whine in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)