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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 Sat, May-05-2012, 11:41:18 PM   #1
mrdoodle
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Default Help with Differential Grind

Hey guys I just joined the forum on account of the problem I’m facing

I did a diff fluid swap last week with the OEM fluid + FM the reason being I

was hearing the light whine through tight corners. Following the swap I did 20

tight figure 8s around a parking lot, after which the diff sounded fine. It

was the next day when I noticed the grinding noise with the window

open. It sounds like a rotating grind, and it happens while accelerating,

decelerating, as well as during coasts and corners (mostly right turns). Just

as a side note, I did jack the car up via the diff in the back, I was not paying

attention, but it didn’t seem to do any damage since there was a rubber

block between the jack and diff (not going to make this mistake again)

The car is a 2003 M3 with 38k miles SMG

Btw, here's a link to a video I uploaded to YouTube, the sound is clear at 12

to 18 seconds

Last edited by mrdoodle; Sat, May-05-2012 at 11:49:54 PM.
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Old Sun, May-06-2012, 12:44:04 AM   #2
abakos
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Default Re: Help with Differential Grind

Was it actually OEM fluid or relabeled?

Did you get enough in there? That is to say, the car wasn't on a funny grade or anything was it?

Lastly, I think I remember a post about a guy still having noise and he used the BG limited slip additive and it worked well:

http://www.bgprod.com/products/driveline.html

found thread:

http://www.m3forum.net/m3forum/showthread.php?t=400468
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2004 M3 - Coupe, 6spd, Silver Grey on Black
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2006 Jetta TDI/DSG, Pkg 2, Silver on Black - Sold
2004 M3 SMG - Silver Grey on Black, Convertible - RIP
1995 525I 5spd - Black on Black -Sold
2004 X3 3.0i AT- Blue on Tan - For the wife....


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Old Sun, May-06-2012, 12:57:31 AM   #3
mrdoodle
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Default Re: Help with Differential Grind

No, the car was on an even slope and the fluid was OEM, ordered off of ECS tuning. I know it was filled since it used all three bottles before it started to drain slightly from the fill hole. It just worries me since it sounds so bad, much worse than the slight whine I would hear during tight corners. I've done some more tight corners and I've floored the car a few times to see if it would help, it didn't help.
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Old Sun, May-06-2012, 01:13:05 AM   #4
lmtfi
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Default Re: Help with Differential Grind

Quote:
Originally Posted by mrdoodle View Post
No, the car was on an even slope and the fluid was OEM, ordered off of ECS tuning. I know it was filled since it used all three bottles before it started to drain slightly from the fill hole. It just worries me since it sounds so bad, much worse than the slight whine I would hear during tight corners. I've done some more tight corners and I've floored the car a few times to see if it would help, it didn't help.
Just read and follow Akakos' second link.
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Old Sun, May-06-2012, 01:34:46 AM   #5
abakos
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Default Re: Help with Differential Grind

Quote:
Originally Posted by lmtfi View Post
Just read and follow Akakos' second link.
Akakos?
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2004 M3 - Coupe, 6spd, Silver Grey on Black
RAC RG63, PSS, ZCP Brakes, aFe, SS (V1, Res. X-pipe, Street Muffler), Epic Alpha-N, 319whp

2006 Jetta TDI/DSG, Pkg 2, Silver on Black - Sold
2004 M3 SMG - Silver Grey on Black, Convertible - RIP
1995 525I 5spd - Black on Black -Sold
2004 X3 3.0i AT- Blue on Tan - For the wife....


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Old Sun, May-06-2012, 01:53:11 AM   #6
mrdoodle
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Default Re: Help with Differential Grind

So I found the additive they were discussing on the linked post at http://www.zip-corvette.com/ProductDetails/ProductDetails.aspx?pid={b74e07f0-1dbf-484a-b42f-482c4d03f37e}&gid={57c6b8a3-5299-44cb-b16c-54091d8f6f76}&GroupName=BG+Products&pname=BG+Limit ed+Slip+Additive+-+6oz
Would I simply need to open the fill cap and squeeze this stuff into the diff?
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Discussing Help with Differential Grind 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)