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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Decided to fit a M3 diff



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      02-29-2016, 06:45 PM   #331
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Counterbalancing bolts/washers on E9X ///M diffs

Has anyone ever witnessed the counterbalance bolts/washers on ther ///M diffs? This is a post I put up on M3post:

http://www.m3post.com/forums/showthread.php?t=1231461

I have a 335i and have recently installed a complete driveline from a M3 into my car. This retrofit conversion has been commonplace for years now and the workshop who performed this conversion for me had done at least 4 of them in the past.

It largely all bolts up but to mate the diff up a custom driveshaft had to be manufactured as my 335i shaft wouldn't fit the M3 Diff flange. I purchased a E38 driveshaft (the 540i and 740i share the same type of diff flange to the M3) and the rear portion of my 335i was cut and the 740i section was welded to the shaft and balanced by a driveline specialist.

Upon driving the car above 80 km/h I was experiencing a humming vibration through the car (Seats, steering wheel etc) and it didn't dissapear at 140 km/h or when i applied the throttle or backed off the throttle.. It sounded like it was an out of balance driveshaft...

I was initially perturbed that a driveshaft would be cut n shut and welded as this sounded like a crude method, but alas there have been many conversions conducted on 135/335i around the world and this is the method they used...

Now to get to the reason for creating this thread and how it may be of relevance to you E9X M3 owners!

Discussing this issue with a fellow enthusiast who is a tech head and dabbles in a lot of coding, tweaking, research he came across some info in the BMW ISTA that may be the reason for my driveline vibration..

Apparently the driveline is setup to quite fine tolerances and each diff is balanced after assembly (you'll see a little round recess drilled in the flange - this is the method of correction where material is removed from the point of imbalance to ensure its precisely balanced)

drilling of the flange to remove imbalance:



In addition to the machining of the diff flange for balancing correction, there is counterbalancing on the bolts where the driveshaft connects to the diff flange as required for fine corrections (i.e if they cant get the diff perfectly balanced at the factory the technician marks the diff as OK or requiring addition counterbalancing - this is determined by the coloured mark on the diff)







Example of marks:



prior to 09/09 the counterbalancing was done with the use of washers on the marked hole )as indicated by the colour mark by the bmw factory tech) or after 09/09 special bolts once again as indicated by the colour marks. The diff I had was from a 2011 build M3 so if it required counterbalacing, it would require bolts.



bmw part #26112284154 black
bmw part #26112284153 green
black bolt is for blue marking
green is for yellow marking
if diff has white marking no counterbalance bolts required

My local BMW dealer (I'm in Australia) got me some prices for these bolts, he had some trouble as they weren't in the system as it seems no-one has ever ordered them and he discussed it with the workshop foreman who said they weren't aware of these counterbalance bolts..

They're a special order from Germany, and since I have no markings visible on my diff I would have to order both and attempt to find the orientation they should be mounted by installing driving the car and checking and removing and changing the position etc (not an easy task to do...)





*Quoted prices in AUD not USD*

I'm hoping the car doesn't need these bolts, as my diff has no marks so it will be a long process in attempting to locate the correct position on the flange which requires the counterbalance bolt.

My local BMW workshop foreman stated that they treat the diff flange bolts as a once use item (even though BMW procedures don't stipulate that the need to be replaced) and was unaware of the counterbalance bolts or washers...

Have any of you M3 owners ever been aware of the counterbalance bolts or washers?!?!
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      03-11-2016, 08:04 PM   #332
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Quote:
Originally Posted by DR-JEKL View Post
[b]Has anyone ever witnessed the counterbalance bolts/washers on ther ///M diffs?
Thank you! I'm fitting an M3 diff to my car as we speak and it has a blue dot. New bolt is ordered!
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      03-12-2016, 12:55 AM   #333
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Quote:
Originally Posted by Theconnman2 View Post
Thank you! I'm fitting an M3 diff to my car as we speak and it has a blue dot. New bolt is ordered!
Just be careful if yours is <08/2009 it will need a washer >8/2009 uses a bolt
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      03-18-2016, 06:54 PM   #334
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Has anyone had problems with the driver side axle being too long? From all the people I have asked the m3 axles are the same length on both side but the diff'S driver side comes out further than the passenger side. My driver side cv has no movement and is pushing in on the diff an out on the hub. Any advice would be appreciated!
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      03-28-2016, 07:27 PM   #335
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Quote:
Originally Posted by Theconnman2 View Post
Has anyone had problems with the driver side axle being too long? From all the people I have asked the m3 axles are the same length on both side but the diff'S driver side comes out further than the passenger side. My driver side cv has no movement and is pushing in on the diff an out on the hub. Any advice would be appreciated!
I haven't measured mine, but from I remember, I'm pretty sure they are different lengths. The left and right driveshaft have different parts numbers so I don't see why they would do that if they fit both sides
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      03-31-2016, 07:36 PM   #336
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Quote:
Originally Posted by liket View Post
I haven't measured mine, but from I remember, I'm pretty sure they are different lengths. The left and right driveshaft have different parts numbers so I don't see why they would do that if they fit both sides
Thanks for the response. They are infact different.
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      06-26-2016, 04:21 PM   #337
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Does any one know the wheel offset to fit under the stock fenders? with the complete m3 rear subframe.
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      06-27-2016, 08:33 AM   #338
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Quote:
Originally Posted by Johnny1 View Post
Does any one know the wheel offset to fit under the stock fenders? with the complete m3 rear subframe.
The rear m3 complete subframe is no wider that the standard one. use 335i offsets
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      07-25-2016, 11:01 PM   #339
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what about a 135i
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      07-26-2016, 07:32 AM   #340
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Quote:
Originally Posted by Johnny1 View Post
what about a 135i
The extra track on the ///M's is purely in the rims it will fit fine on your 135i
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      07-28-2016, 11:47 PM   #341
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      11-26-2016, 09:42 AM   #342
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Does anybody know if the E39 M5 V8 middle-axle (propshaft) flange will fit the E9x M3 diff flange?

I see the 540/740 V8 flange is supposed to fit.
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      11-26-2016, 10:35 AM   #343
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Does anybody have the exact total length of driveshaft when having a short 12/2008 335i N54 manual and M3 diff?

Considering the possibility of a 1-piece dry-carbon instead of rebuilding a stock or M3 shaft.
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      03-12-2017, 05:38 PM   #344
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Quote:
Originally Posted by Tuningservice.no View Post
Does anybody know if the E39 M5 V8 middle-axle (propshaft) flange will fit the E9x M3 diff flange?

I see the 540/740 V8 flange is supposed to fit.
The 740i flange definately fits!
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