Anyone with O.S. Giken LSD? Need some feedback please

vasillalov · 04-25-2013, 05:54 PM

All,

I just got my car back from getting an O.S. Giken installed along with M3 subframe bushings and Delrin differential bushings.

The LSD was built by VAC since I had welded ring gear. So I received the whole housing, aka "the pumpkin" already built and assembled from VAC. Therefore, I trust their build.

I took a longer drive around the city today and I noticed the following:

1. There is a faint whining noise definitely coming from the differential. Its not there when cruizing. If I accelerate OR decelerate the frequency and the sound level increase or decrease. However, if I cruise at constant rate regardless of the speed, there is no sound.

2. Sometimes when I engage and disengage the clutch, there is a faint "thud" or "thump" sound coming out of the back.

Are these symptoms normal?

Thanks in advance.

Vasil

tres · 04-25-2013, 07:23 PM

do you have a manual car? I get that same thud with my wavetrac
you may be getting some trans whine Honestly I don't think anything is wrong with your diff but I would call mike at VAC just to verify.

vasillalov · 04-25-2013, 07:28 PM

You are the second person who said the "thud" is inherent to Wavetrac. I am desperately hoping that VAC did not mix up the housings and sent me one with a Wavetrac instead of O.S. Giken.

M3 subframe bushings and Delrin (not solid) diff bushings were installed.

cleex024 · 04-25-2013, 07:35 PM

Just wait a bit longer it does have to break in a little as it is a clutch. .. plus your delrin mounts do not help as that will transmit every sound into the cabin

tres · 04-25-2013, 07:37 PM

you have the set up as mine in the rear bushing wise. I don't think they did and if they did im sure they would correct it. I think its normal considering your mods. If you're really paranoid drain the diff and remove the cover and check to see if its what you paid for.

Quote:

Originally Posted by vasillalov

You are the second person who said the "thud" is inherent to Wavetrac. I am desperately hoping that VAC did not mix up the housings and sent me one with a Wavetrac instead of O.S. Giken.

M3 subframe bushings and Delrin (not solid) diff bushings were installed.

vasillalov · 04-25-2013, 07:42 PM

Quote:

Originally Posted by tres

you have the set up as mine in the rear bushing wise. I don't think they did and if they did im sure they would correct it. I think its normal considering your mods. If you're really paranoid drain the diff and remove the cover and check to see if its what you paid for.

Well, I will wait the 500 miles for the break in and then take of the cover when draining the diff. I'll inspect thing then.

tres · 04-25-2013, 07:45 PM

Ok cool

Quote:

Originally Posted by vasillalov

Well, I will wait the 500 miles for the break in and then take of the cover when draining the diff. I'll inspect thing then.

joec500 · 04-25-2013, 08:45 PM

I get a thud as well with my 6MT Wavetrac, I think it might be inherent in all aftermarket LSD's.

I know Sikh335i has an OSG diff, you should PM him

vasillalov · 04-25-2013, 09:16 PM

Thanks. I will ask him as well. I know AlpinaB3Lux has the exact same lsd as me: the TCD version from OS Giken. I will talk to him too

DallasBoosted · 04-25-2013, 09:58 PM

Quote:

Originally Posted by vasillalov

Thanks. I will ask him as well. I know AlpinaB3Lux has the exact same lsd as me: the TCD version from OS Giken. I will talk to him too

No thud and no audible gear noise from mine.

blisstik · 04-25-2013, 10:00 PM

Do you have solid differential bushings? That will transmit some of the whine. The thud may come from the way you release your clutch.

vasillalov · 04-25-2013, 10:18 PM

Quote:

Originally Posted by DallasBoosted

No thud and no audible gear noise from mine.

Crap!

EDIT: ...and thank you for the feedback!

vasillalov · 04-25-2013, 10:19 PM

Quote:

Originally Posted by blisstik

Do you have solid differential bushings? That will transmit some of the whine. The thud may come from the way you release your clutch.

Those are the bushings I have:

robc1976 · 04-26-2013, 12:10 AM

Quote:

Originally Posted by vasillalov

Those are the bushings I have:

I have solid bushings, no whine at all...this is what caused my blank sound if this helps:

http://www.e90post.com/forums/showthread.php?t=816053

I believe in MT cars clunk happens more.

tigermack · 04-26-2013, 03:00 AM

You sure the bolt through the bushing is tight? Might wanna check.

vasillalov · 04-26-2013, 07:03 AM

Guys, you are making me very nervous... I will check over the weekend to see what's the story with the bolts.

DefactoM6 · 04-26-2013, 10:00 AM

Welcome to owning a LSD with delrin bushings. And welcome to owning a clutched LSD. You'll get used to it.

M3coupe · 04-26-2013, 11:14 AM

All factory E46m3's with 6sp had this thud. Completely normal. Not sure about E9x

Sick335 · 04-26-2013, 11:49 AM

Better than the rattling noise that mine makes...

DallasBoosted · 04-26-2013, 11:54 AM

Quote:

Originally Posted by vasillalov

Crap!

EDIT: ...and thank you for the feedback!

I have the powerflex subframe and diff bushings, its possible that your delrin diff bushings are transmitting the gear whine.

Does it do the thunk thing every time you put it in gear with the clutch in, or does it do it when you start to drive away?

E92mech · 04-26-2013, 01:58 PM

I have a VAC-built Quaife on an E92 with stock diff bushings and I have a small clunk just from standstill into 1st. Normal.

I would imagine there is more NVH transmission with the stiffer bushings or lockdown kit. (Which is why I didn't put it on my DD)

robc1976 · 04-26-2013, 03:19 PM

Quote:

Originally Posted by E92mech

I have a VAC-built Quaife on an E92 with stock diff bushings and I have a small clunk just from standstill into 1st. Normal.

I would imagine there is more NVH transmission with the stiffer bushings or lockdown kit. (Which is why I didn't put it on my DD)

there is no NVH with my lock down kit in the least.

04-25-2013, 05:54 PM	#1
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,397 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	Anyone with O.S. Giken LSD? Need some feedback please All, I just got my car back from getting an O.S. Giken installed along with M3 subframe bushings and Delrin differential bushings. The LSD was built by VAC since I had welded ring gear. So I received the whole housing, aka "the pumpkin" already built and assembled from VAC. Therefore, I trust their build. I took a longer drive around the city today and I noticed the following: 1. There is a faint whining noise definitely coming from the differential. Its not there when cruizing. If I accelerate OR decelerate the frequency and the sound level increase or decrease. However, if I cruise at constant rate regardless of the speed, there is no sound. 2. Sometimes when I engage and disengage the clutch, there is a faint "thud" or "thump" sound coming out of the back. Are these symptoms normal? Thanks in advance. Vasil __________________
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04-25-2013, 07:23 PM	#2
tres Major 34 Rep 1,381 Posts Drives: 2011 bmw 335is 6MT Join Date: Apr 2009 Location: maryland iTrader: (6)	do you have a manual car? I get that same thud with my wavetrac you may be getting some trans whine Honestly I don't think anything is wrong with your diff but I would call mike at VAC just to verify. Last edited by tres; 04-25-2013 at 07:28 PM..
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04-25-2013, 07:28 PM	#3
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,397 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	You are the second person who said the "thud" is inherent to Wavetrac. I am desperately hoping that VAC did not mix up the housings and sent me one with a Wavetrac instead of O.S. Giken. M3 subframe bushings and Delrin (not solid) diff bushings were installed. __________________
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04-25-2013, 07:35 PM	#4
cleex024 Lieutenant Colonel 104 Rep 1,529 Posts Drives: 2008 BMW 335i Coupe Join Date: Mar 2011 Location: Woodbridge iTrader: (2)	Just wait a bit longer it does have to break in a little as it is a clutch. .. plus your delrin mounts do not help as that will transmit every sound into the cabin __________________ Space Gray l 6MT l OSG LSD w/ VAC Race Diff Cover l Cobb e30 l Morr vs8.2 l UUC SSK w/ DSSR l VSRF Catless Dps l RPI Intercooler l CDV Removed l HID AE 8000k l ETS Catback l AST 5200 w/ Vorshlag Camber Plates l ER Dual Oil Coolers l Rear Camber and Toe Arms l K&N Drop In l Solid Tranny/Diff/Subframe Bushings l Bridgestone RE-11
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04-25-2013, 08:45 PM	#8
joec500 Brigadier General 125 Rep 3,004 Posts Drives: it has 4 wheels Join Date: Jul 2008 Location: San Francisco iTrader: (10)	I get a thud as well with my 6MT Wavetrac, I think it might be inherent in all aftermarket LSD's. I know Sikh335i has an OSG diff, you should PM him __________________ 2007 E92 6MT SGM: MusicarNW Level 2, Procede Rev 2.5, FFTEC/Vishnu LPFP with Flexfuel Sensor and Flash, M3 Offset V701's, WaveTrac LSD, Michelin PSS, Downpipes, M3 Control Arms, TCKline D/A Suspension, LCI Tail lights, Lux AE's, ER Charge Pipe, DCI's, Mtech Front and Rear, M3 Sideskirts, HPF Stage 1 Clutch
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04-25-2013, 09:16 PM	#9
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,397 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	Thanks. I will ask him as well. I know AlpinaB3Lux has the exact same lsd as me: the TCD version from OS Giken. I will talk to him too
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04-25-2013, 10:00 PM	#11
blisstik Lieutenant Colonel 151 Rep 1,677 Posts Drives: E92 Join Date: Jul 2009 Location: California iTrader: (14)	Do you have solid differential bushings? That will transmit some of the whine. The thud may come from the way you release your clutch.
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04-26-2013, 03:00 AM	#15
tigermack OPN DIFF 478 Rep 1,909 Posts Drives: 10' E90 M3 6MT LB Join Date: Oct 2012 Location: Pacific Ocean iTrader: (12) Garage List 2010 M3 [0.00] 1995 BMW e36 325i [7.91] 2006 BMW e90 330i [8.34]	You sure the bolt through the bushing is tight? Might wanna check. __________________ '10 LB E90 slicktop/speed cloth/6MT ex. '06 330i 6MT & '10 n54 6MT Msport Autocross vids https://www.youtube.com/user/tigermack https://www.instagram.com/tigermack
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04-26-2013, 07:03 AM	#16
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,397 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	Guys, you are making me very nervous... I will check over the weekend to see what's the story with the bolts. __________________
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04-26-2013, 10:00 AM	#17
DefactoM6 Sees the world the way it could be 49 Rep 761 Posts Drives: '88 M6, '02 Z8, '09 E92 335i Join Date: May 2010 Location: CT iTrader: (11)	Welcome to owning a LSD with delrin bushings. And welcome to owning a clutched LSD. You'll get used to it. __________________
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04-26-2013, 11:14 AM	#18
M3coupe Private 5 Rep 59 Posts Drives: 335is Join Date: Mar 2012 Location: GA iTrader: (2)	All factory E46m3's with 6sp had this thud. Completely normal. Not sure about E9x
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04-26-2013, 11:49 AM	#19
Sick335 Major 88 Rep 1,174 Posts Drives: 335i / X6M Join Date: Oct 2011 Location: Woodland Hills, CA iTrader: (2)	Better than the rattling noise that mine makes...
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04-26-2013, 01:58 PM	#21
E92mech E92 17 Rep 130 Posts Drives: 2010 E92 Le Mans M-Sport Join Date: Feb 2012 Location: Maryland iTrader: (0)	I have a VAC-built Quaife on an E92 with stock diff bushings and I have a small clunk just from standstill into 1st. Normal. I would imagine there is more NVH transmission with the stiffer bushings or lockdown kit. (Which is why I didn't put it on my DD)
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