Calling all 6MT N54s

dzenno · 09-15-2010, 07:32 AM

I'm trying to isolate an issue on my car and was thinking of asking some of you for assistance, especially those with Wavetrac LSDs installed, but would Like the stock diff guys to chime in as well.

Here's a quick and simple test:

1) Get the car coasting at about 100km/h (speed isn't important just need the car rolling for a 20-30 secs)

2) Press the clutch pedal to the floor (disengaging clutch) and HOLD it there

3) Grab the shifter and start moving it up/down from 3rd to 4th gear and back. Try not to pause in neutral, just pull and push as quickly as possible between these two gears and when doing this and don't lift your foot off the clutch pedal.

On my car every time i go down into 4th from 3rd it'll thump in the rear as if somthing hit the floor in the trunk (not if I go slower pausing for a half sec in neutral).

Note, it's not isolated to 3rd-4th gear upshift. You could do 1-2 or 2-3 or or 3-4 or 4-5 (less loud). I can't hear it on 5-6. Downshifting never thumps...

Greatly appreciated..

forza1976 · 09-15-2010, 07:37 AM

In the three years I have owned my car it has never done that. However I don't have an LSD.

dzenno · 09-15-2010, 07:49 AM

This isn't noticeable in every day easy driving. If you can do the test as described above that'd be awesome. Thanks forza..

forza1976 · 09-15-2010, 08:11 AM

I'll try it for sure this afternoon on my way to Bandimere for a few runs and report back.

That sure is some strange behavior you are mentioning. Hope it gets resolved in short order as I know you have been dealing with it a bit.

oddjob2021 · 09-15-2010, 08:28 AM

i tried it. only heard the click click, click click of the shifter itself. no noise in the rear except road noise. i have a quaife lsd.

import36 · 09-15-2010, 08:42 AM

i'll give this a shot later today and report back as well. (minus the LSD)

Alessandro · 09-15-2010, 08:51 AM

no noise here either just smooth.

dzenno · 09-15-2010, 02:16 PM

Thanks guys, keep it coming..so far no thumpers...

Mike@N54Tuning.com · 09-15-2010, 02:38 PM

smooth with no noise for me.. Stock Diff..

Mike

themyst · 09-15-2010, 05:53 PM

no thump

GaryS · 09-15-2010, 06:56 PM

No thump in my 135i. My previous car had a GKN Super LSD and thumped once in a while.

2kaccordocoupe · 09-15-2010, 07:01 PM

I don't get a thump doing what you mentioned above however I do it get a thump when going from 1st to reverse and vice versa.

Stock drive line

dzenno · 09-15-2010, 07:07 PM

thanks guys, keep it coming...wish I get a few posts from guys with wavetracs and quaifes on their N54s..so far just one and its a quaife (thanks oddjob)...

Xaero · 09-15-2010, 07:45 PM

Im getting a thump at low rpms around town when i start from a stop.

import36 · 09-15-2010, 07:48 PM

no thumps here dzenno...tried a couple different gear combos.(no lsd)

bkrM3 · 09-16-2010, 08:15 AM

Tried it today coasting at like 45-40mph, back and forth from 3-4, 4-3...no thump. Stock diff, modified CDV.

dzenno · 09-16-2010, 08:50 AM

Thanks guys...i also did not have any thumps with the stock diff on the car...this started happening when the swap was done...really wish that at this point there's some more LSD guys chiming in...

GQMONEYGRIP · 09-27-2010, 03:01 PM

I have a 2007 e92 coupe with 6mt and a Quaife LSD. I tried this and get a mild thump. It is very mild when actually driving, even with a quick 3rd to 4th shift. I also get the mild thump when I am at a stop and throw it quickly into 1 or R- but not if i slow the process down a bit. I hear the thump while going into 1 or R is quite "normal" and luckily not too annoying. Not sure about the 3rd to 4th shift. Luckily the driving transformation makes up for the noise. I did a core diff exchange so not sure what could be wrong and since I hear from Kevin Bird that this sound is "normal without detrimental effects on the car" I have given up for now looking for a solution. May even be related to slack? Not sure if diff oil can affect this noise. Hope the boards reveal some answers to this minor annoyance of a problem for me and others. Maybe we can get Kevin Bird and other diff experts to help us.

dzenno · 09-27-2010, 03:14 PM

Interesting, thanks..if you get your rear seats out you'll hear/feel it a lot more...

With the rear seats back in the car I can't feel any vibration whatsoever..I'm stumped yet again..thump is still there with the above test but in regular driving can't hear/feel it with the rear seats in their place..

Wonder how many of those that have LSDs ever drove their cars with rear seats out

Bimmer Al · 09-27-2010, 08:43 PM

?

Brey335i · 09-27-2010, 09:58 PM

Did you contact Wavetrac about this?

stressdoc · 09-27-2010, 10:01 PM

Do you have the stiffer M3 subframe mounts? Or the marshmallow OEM ones.

09-15-2010, 07:32 AM	#1
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	Calling all 6MT N54s - assistance with a quick test I'm trying to isolate an issue on my car and was thinking of asking some of you for assistance, especially those with Wavetrac LSDs installed, but would Like the stock diff guys to chime in as well. Here's a quick and simple test: 1) Get the car coasting at about 100km/h (speed isn't important just need the car rolling for a 20-30 secs) 2) Press the clutch pedal to the floor (disengaging clutch) and HOLD it there 3) Grab the shifter and start moving it up/down from 3rd to 4th gear and back. Try not to pause in neutral, just pull and push as quickly as possible between these two gears and when doing this and don't lift your foot off the clutch pedal. On my car every time i go down into 4th from 3rd it'll thump in the rear as if somthing hit the floor in the trunk (not if I go slower pausing for a half sec in neutral). Note, it's not isolated to 3rd-4th gear upshift. You could do 1-2 or 2-3 or or 3-4 or 4-5 (less loud). I can't hear it on 5-6. Downshifting never thumps... Greatly appreciated..
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09-15-2010, 07:37 AM	#2
forza1976 Major General 3399 Rep 6,589 Posts Drives: BMW Join Date: Aug 2007 Location: 49417 and 60610 iTrader: (13) Garage List 2022 BMW M3X [10.00]	In the three years I have owned my car it has never done that. However I don't have an LSD.
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09-15-2010, 07:49 AM	#3
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	This isn't noticeable in every day easy driving. If you can do the test as described above that'd be awesome. Thanks forza..
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09-15-2010, 08:11 AM	#4
forza1976 Major General 3399 Rep 6,589 Posts Drives: BMW Join Date: Aug 2007 Location: 49417 and 60610 iTrader: (13) Garage List 2022 BMW M3X [10.00]	I'll try it for sure this afternoon on my way to Bandimere for a few runs and report back. That sure is some strange behavior you are mentioning. Hope it gets resolved in short order as I know you have been dealing with it a bit.
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09-15-2010, 08:28 AM	#5
oddjob2021 ASR Turbos+LSD+Meth= :D 73 Rep 1,517 Posts Drives: E92 335i Join Date: May 2007 Location: Miami, FL iTrader: (0) Garage List 2007 E92 335i [0.00]	i tried it. only heard the click click, click click of the shifter itself. no noise in the rear except road noise. i have a quaife lsd. __________________ 2007 335i Coupe Mods: Check the Garage
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09-15-2010, 08:42 AM	#6
import36 Burrito bowl connoisseur 124 Rep 3,501 Posts Drives: 2015 Nissan GTR Black Edition Join Date: Feb 2008 Location: Seven Cities iTrader: (1)	i'll give this a shot later today and report back as well. (minus the LSD)
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09-15-2010, 08:51 AM	#7
Alessandro Major 111 Rep 1,043 Posts Drives: Audi RS5 Join Date: Mar 2008 Location: Canada iTrader: (8) Garage List 2011 335is [9.50]	no noise here either just smooth.
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09-15-2010, 02:16 PM	#8
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	Thanks guys, keep it coming..so far no thumpers...
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09-15-2010, 02:38 PM	#9
Mike@N54Tuning.com Joint Chiefs of Staff 4919 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	smooth with no noise for me.. Stock Diff.. Mike
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09-15-2010, 05:53 PM	#10
themyst Major General 177 Rep 6,631 Posts Drives: '16 MK7 GTI Join Date: Feb 2009 Location: NYC iTrader: (8)	no thump __________________ E90 LCI N54 6AT
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09-15-2010, 06:56 PM	#11
GaryS Colonel 37 Rep 2,084 Posts Drives: 2009 135i 6MT Join Date: Feb 2010 Location: Maryland iTrader: (0) Garage List 2009 135i [6.50]	No thump in my 135i. My previous car had a GKN Super LSD and thumped once in a while.
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09-15-2010, 07:01 PM	#12
2kaccordocoupe Brigadier General 1274 Rep 4,703 Posts Drives: Former ///M Driver Join Date: Nov 2008 Location: The 6ix iTrader: (2)	I don't get a thump doing what you mentioned above however I do it get a thump when going from 1st to reverse and vice versa. Stock drive line
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09-15-2010, 07:07 PM	#13
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	thanks guys, keep it coming...wish I get a few posts from guys with wavetracs and quaifes on their N54s..so far just one and its a quaife (thanks oddjob)...
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09-15-2010, 07:45 PM	#14
Xaero Private First Class 9 Rep 184 Posts Drives: Black 335i e92 Join Date: Jan 2010 Location: Louisiana iTrader: (0)	Im getting a thump at low rpms around town when i start from a stop. __________________ 2009 e92 335i 6spd :: Black Sapphire Metallic :: Coral Red :: Work Gnosis GS4 Wheels (20x8.5+32/20x9.5+35) :: Bronze Rays Lug Nuts :: AngeliBright v3 :: PROcede v4 :: Injen DCI :: Clutch Stop :: B&G S2 Sport Springs :: Matte Black Kidney Grilles :: Tinted Taillights :: Escort Passport 9500ix :: Samsung S1 160GB HDD
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09-15-2010, 07:48 PM	#15
import36 Burrito bowl connoisseur 124 Rep 3,501 Posts Drives: 2015 Nissan GTR Black Edition Join Date: Feb 2008 Location: Seven Cities iTrader: (1)	no thumps here dzenno...tried a couple different gear combos.(no lsd)
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09-16-2010, 08:15 AM	#16
bkrM3 Major 73 Rep 1,388 Posts Drives: E90 M3 Join Date: Apr 2010 Location: Main Line iTrader: (9) Garage List 2009 BMW M3 [9.50]	Tried it today coasting at like 45-40mph, back and forth from 3-4, 4-3...no thump. Stock diff, modified CDV. __________________ E90 M3 Space/Fox/6MT E92 335i BSM/Saddle/6MT - Sold
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09-16-2010, 08:50 AM	#17
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	Thanks guys...i also did not have any thumps with the stock diff on the car...this started happening when the swap was done...really wish that at this point there's some more LSD guys chiming in...
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09-27-2010, 03:01 PM	#18
GQMONEYGRIP New Member 0 Rep 9 Posts Drives: 335i, Gallardo, GT2, Vantage, Join Date: Apr 2008 Location: usa iTrader: (0)	I have a 2007 e92 coupe with 6mt and a Quaife LSD. I tried this and get a mild thump. It is very mild when actually driving, even with a quick 3rd to 4th shift. I also get the mild thump when I am at a stop and throw it quickly into 1 or R- but not if i slow the process down a bit. I hear the thump while going into 1 or R is quite "normal" and luckily not too annoying. Not sure about the 3rd to 4th shift. Luckily the driving transformation makes up for the noise. I did a core diff exchange so not sure what could be wrong and since I hear from Kevin Bird that this sound is "normal without detrimental effects on the car" I have given up for now looking for a solution. May even be related to slack? Not sure if diff oil can affect this noise. Hope the boards reveal some answers to this minor annoyance of a problem for me and others. Maybe we can get Kevin Bird and other diff experts to help us.
	Appreciate 0 Quote

09-27-2010, 03:14 PM	#19
dzenno Banned 273 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	Interesting, thanks..if you get your rear seats out you'll hear/feel it a lot more... With the rear seats back in the car I can't feel any vibration whatsoever..I'm stumped yet again..thump is still there with the above test but in regular driving can't hear/feel it with the rear seats in their place.. Wonder how many of those that have LSDs ever drove their cars with rear seats out Last edited by dzenno; 09-27-2010 at 03:21 PM..
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09-27-2010, 08:43 PM	#20
Bimmer Al Lieutenant 24 Rep 597 Posts Drives: 2010 335xi Coupe MSport, 6MT Join Date: Aug 2007 Location: Ontario, Canada iTrader: (0)	? __________________ *2010 335i xDrive Coupe, Titanium Silver, MSport 6MT* 2006 325i Sparkling Graphite Sport Package 6MT Retired 1999 323i Titanium Silver, Sport Package, 5MT Retired
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09-27-2010, 09:58 PM	#21
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	Did you contact Wavetrac about this?
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09-27-2010, 10:01 PM	#22
stressdoc Moderator 618 Rep 10,855 Posts Drives: BMW i8; Toy 4runner TRD pro Join Date: Jun 2005 Location: Waco TX iTrader: (0)	Do you have the stiffer M3 subframe mounts? Or the marshmallow OEM ones. __________________ My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808 my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279
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