The DEFIVfab E9X M3 Differential Lockdown Kit, EXCLUSIVELY @ AUTOcouture Motoring

spr · 05-26-2013, 04:37 PM

Sorry to hijack this thread, but what exactly is this attempting to cure? I ask as I have an issue when driving the car 8/10's or so in the canyons and exiting on right hand turns when shifting the right rear kicks like a mule and I can feel the wheel/suspension traveling aft and forward grossly unsettling the car. Is this for this symptom or do I have a bad bushing or broken diff bolt??? I've complained to the dealer several times to no cure. Thanks!

defivfab · 05-28-2013, 09:09 PM

Quote:

Originally Posted by spr

Sorry to hijack this thread, but what exactly is this attempting to cure? I ask as I have an issue when driving the car 8/10's or so in the canyons and exiting on right hand turns when shifting the right rear kicks like a mule and I can feel the wheel/suspension traveling aft and forward grossly unsettling the car. Is this for this symptom or do I have a bad bushing or broken diff bolt??? I've complained to the dealer several times to no cure. Thanks!

Obviously, The first thing to check is the suspension for broken/bent pieces, worn bushings, etc. Mileage and state of tune (n/a,s/c,etc) and transmission type/driving style all play a role in determining what could possibly be the issue. Yes, erratic driveline behavior is markedly improved with the kit, as the oem bushings wear out the car becomes increasingly unpredictable in any situation where power is applied to the wheels. This effect is exacerbated if power is increased. If you PM me specifics(as to not "muddy up" the thread) of what's done to your car,mileage,etc I can assist in helping to determine a solution and so forth. Chances are it will help greatly, but I'd like to hear specifics before saying "absolute fix".

spr · 05-28-2013, 09:11 PM

Thanks I'll follow up with you after I check it out in the rack at my buddy's shop. I'm guessing bad bushings. I just didn't know if that was also an indication of bad diff bolts as well.

defivfab · 05-29-2013, 04:54 PM

Quote:

Originally Posted by spr

Thanks I'll follow up with you after I check it out in the rack at my buddy's shop. I'm guessing bad bushings. I just didn't know if that was also an indication of bad diff bolts as well.

One does lead to the other...

vinniechin · 06-01-2013, 09:05 PM

Can I use this with Poly Bushings instead of Aluminum? My Dinan Diff makes A LOT of noise and I want to quiet it down (I have poly already in car...had delrin and it was too loud). Think the brace will help spread the noise elsewhere to help keep whine to a minimum?

My diff is so much louder than stock, I think something is wrong with it. Its just usually on deceleration at 2600 rpm so that could be where the harmonics is at its worst for whine...

s65e90 · 06-02-2013, 10:22 AM

Quote:

Originally Posted by vinniechin

Can I use this with Poly Bushings instead of Aluminum? My Dinan Diff makes A LOT of noise and I want to quiet it down (I have poly already in car...had delrin and it was too loud). Think the brace will help spread the noise elsewhere to help keep whine to a minimum?

My diff is so much louder than stock, I think something is wrong with it. Its just usually on deceleration at 2600 rpm so that could be where the harmonics is at its worst for whine...

Could be the gears setup wrong. If the gears are not installed 100% perfect you will get a loud whining

vinniechin · 06-02-2013, 01:57 PM

I was hoping that wasn't the answer...I think whine on deceleration has something to do with ring and pinion but I didn't hear anything before the solid bushings. I'm hoping it is normal but I have my suspicions.

I'm going to try Redline oil to see if it helps.

Its only in 6 and 7th gear on deceleration...predominantly around 2700RPM down to 2300.

I was hoping it was just some harmonics that made it as loud as it is through the chassis with the solid subframe and poly diff bushings.

I welcome any suggestions or ideas here.

defivfab · 06-03-2013, 09:22 AM

Quote:

Originally Posted by s65e90

Could be the gears setup wrong. If the gears are not installed 100% perfect you will get a loud whining

In full agreement. Pinion mesh with the ring gear is absolutely critical,down to the thousandth of an inch, and then paint marked for verification of a proper mesh pattern. Sometimes backlash can be within spec and mesh can still be improper, hence verification of proper mesh pattern is critical. As far as use of the brace with the poly front bushings, I have never tried it so I couldn't say either way with certainty. I believe that if your experiencing audible noise now, there is an underlying issue that must be addressed regarding the diff itself.

vinniechin · 06-03-2013, 10:17 AM

Can ACM do this? If not, do you know anyone in the area that can check? Thanks for the help on this. Since it only happens on deceleration around a certain RPM, could it be just harmoics at work finding the right frequency to cause the howl?

This is on deceleration between 2300 and 2800 RPM only in 6th and 7th gear.

Thanks for the help and info...

Lalit@autocouture · 06-03-2013, 11:26 AM

Quote:

Originally Posted by vinniechin

Can ACM do this? If not, do you know anyone in the area that can check? Thanks for the help on this. Since it only happens on deceleration around a certain RPM, could it be just harmoics at work finding the right frequency to cause the howl?

This is on deceleration between 2300 and 2800 RPM only in 6th and 7th gear.

Thanks for the help and info...

What a shame man. Hopefully Prestige works this out for you

vinniechin · 06-03-2013, 11:39 AM

Thanks Lalit and the ACM crew for once again being such a tremendous help. I will be in once I get this resolved.

vinniechin · 06-03-2013, 04:59 PM

I also have to thank DEFIVFAB for answering all my questions. I appreciate the help and I hope to have your brace on shortly after I solve the differential issue.

Thanks everyone who chimed in.

defivfab · 06-03-2013, 09:38 PM

No problem at all, I hope it gets resolved properly and promptly...

Mrbig · 08-08-2013, 11:36 PM

Group pricing ?

hot-j · 10-19-2016, 02:20 PM

Would this fit a 1M? And I already have delrin bushings, would these need to be changed? If not, how bad would the unstall be?

hot-j · 10-19-2016, 03:06 PM

Quote:

Originally Posted by vinniechin

Can I use this with Poly Bushings instead of Aluminum? My Dinan Diff makes A LOT of noise and I want to quiet it down (I have poly already in car...had delrin and it was too loud). Think the brace will help spread the noise elsewhere to help keep whine to a minimum?

My diff is so much louder than stock, I think something is wrong with it. Its just usually on deceleration at 2600 rpm so that could be where the harmonics is at its worst for whine...

I have delrin in my 1M with the stock diff, and I too get bad nvh around that rpm under deceleration. Just a fyi

05-26-2013, 04:37 PM	#23
spr Major 94 Rep 1,089 Posts Drives: F80 M3; e92 ESS650+ M3 Join Date: Nov 2008 Location: San Diego iTrader: (1)	Sorry to hijack this thread, but what exactly is this attempting to cure? I ask as I have an issue when driving the car 8/10's or so in the canyons and exiting on right hand turns when shifting the right rear kicks like a mule and I can feel the wheel/suspension traveling aft and forward grossly unsettling the car. Is this for this symptom or do I have a bad bushing or broken diff bolt??? I've complained to the dealer several times to no cure. Thanks!
	Appreciate 0 Quote

05-28-2013, 09:11 PM	#25
spr Major 94 Rep 1,089 Posts Drives: F80 M3; e92 ESS650+ M3 Join Date: Nov 2008 Location: San Diego iTrader: (1)	Thanks I'll follow up with you after I check it out in the rack at my buddy's shop. I'm guessing bad bushings. I just didn't know if that was also an indication of bad diff bolts as well.
	Appreciate 0 Quote

06-01-2013, 09:05 PM	#27
vinniechin Vinnie 9 Rep 174 Posts Drives: E93 Space Gray DCT Join Date: Jun 2012 Location: Northern NJ iTrader: (1)	Can I use this with Poly Bushings instead of Aluminum? My Dinan Diff makes A LOT of noise and I want to quiet it down (I have poly already in car...had delrin and it was too loud). Think the brace will help spread the noise elsewhere to help keep whine to a minimum? My diff is so much louder than stock, I think something is wrong with it. Its just usually on deceleration at 2600 rpm so that could be where the harmonics is at its worst for whine...
	Appreciate 0 Quote

06-02-2013, 01:57 PM	#29
vinniechin Vinnie 9 Rep 174 Posts Drives: E93 Space Gray DCT Join Date: Jun 2012 Location: Northern NJ iTrader: (1)	I was hoping that wasn't the answer...I think whine on deceleration has something to do with ring and pinion but I didn't hear anything before the solid bushings. I'm hoping it is normal but I have my suspicions. I'm going to try Redline oil to see if it helps. Its only in 6 and 7th gear on deceleration...predominantly around 2700RPM down to 2300. I was hoping it was just some harmonics that made it as loud as it is through the chassis with the solid subframe and poly diff bushings. I welcome any suggestions or ideas here.
	Appreciate 0 Quote

06-03-2013, 10:17 AM	#31
vinniechin Vinnie 9 Rep 174 Posts Drives: E93 Space Gray DCT Join Date: Jun 2012 Location: Northern NJ iTrader: (1)	Can ACM do this? If not, do you know anyone in the area that can check? Thanks for the help on this. Since it only happens on deceleration around a certain RPM, could it be just harmoics at work finding the right frequency to cause the howl? This is on deceleration between 2300 and 2800 RPM only in 6th and 7th gear. Thanks for the help and info...
	Appreciate 0 Quote

06-03-2013, 11:39 AM	#33
vinniechin Vinnie 9 Rep 174 Posts Drives: E93 Space Gray DCT Join Date: Jun 2012 Location: Northern NJ iTrader: (1)	Thanks Lalit and the ACM crew for once again being such a tremendous help. I will be in once I get this resolved.
	Appreciate 0 Quote

06-03-2013, 04:59 PM	#34
vinniechin Vinnie 9 Rep 174 Posts Drives: E93 Space Gray DCT Join Date: Jun 2012 Location: Northern NJ iTrader: (1)	I also have to thank DEFIVFAB for answering all my questions. I appreciate the help and I hope to have your brace on shortly after I solve the differential issue. Thanks everyone who chimed in.
	Appreciate 0 Quote

06-03-2013, 09:38 PM	#35
defivfab New Member 0 Rep 20 Posts Drives: in pieces... Join Date: Mar 2013 Location: United States iTrader: (0)	No problem at all, I hope it gets resolved properly and promptly...
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08-08-2013, 11:36 PM	#36
Mrbig Major 112 Rep 1,468 Posts Drives: 15 M3 Join Date: May 2007 Location: N.Y.C iTrader: (1)	Group pricing ?
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10-19-2016, 02:20 PM	#37
hot-j First Lieutenant 100 Rep 309 Posts Drives: 1M Join Date: Sep 2015 Location: Boston MA iTrader: (0)	Would this fit a 1M? And I already have delrin bushings, would these need to be changed? If not, how bad would the unstall be?
	Appreciate 0 Quote