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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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      12-03-2012, 03:53 AM   #177
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That's interesting. I had read that any difference in track width between M3 and normal e92's was due to wheel offsets.

So this meant most suspension arms are easily interchangeable apart from the 1 or 2 (marginally longer or different damper connection)

The rear hubs aren't that different either. I kinda assumed any difference in driveshaft lengths would be down to the width of the diff.

Hopefully someone knowledgeable will be along shortly!
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      12-03-2012, 06:45 AM   #178
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Quote:
Originally Posted by Nigelo View Post
That's interesting. I had read that any difference in track width between M3 and normal e92's was due to wheel offsets.

So this meant most suspension arms are easily interchangeable apart from the 1 or 2 (marginally longer or different damper connection)

The rear hubs aren't that different either. I kinda assumed any difference in driveshaft lengths would be down to the width of the diff.

Hopefully someone knowledgeable will be along shortly!
Sorry my bad... This is not the length of the sideshafs this is diameter of flange which connects to diff... Same is showed in realoem.

And it would be not logical if the length would be 86mm
So I guess everything is ok.
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      12-04-2012, 05:26 PM   #179
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Originally Posted by RimasRS View Post
Please somebody confirm or deny. Does the M3 sideshafts fit on oem subframe with DCT 3.15 diff? Because N54 have 86mm long sideshaft and the M3 sideshaft is 102mm acording to realoem.com

N54 Sideshaft http://www.realoem.com/bmw/showparts...g=25&lang=enUS

M3 Sideshaft http://www.realoem.com/bmw/showparts...g=25&lang=enUS

So do they fit or do you have to shorten them?
I raised a concern about this as the 135 vs 335 has less play depth wise when pushing the side shaft in hence the M3 one fitting in 335 depth wise. Someone has raised a concern in this regard that attempted the mod on a 135 and for unknown reason it failed. I cannot say 100% though. Worse case would be to give the M3 shaft a slight shave.
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      12-05-2012, 02:46 AM   #180
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I raised a concern about this as the 135 vs 335 has less play depth wise when pushing the side shaft in hence the M3 one fitting in 335 depth wise. Someone has raised a concern in this regard that attempted the mod on a 135 and for unknown reason it failed. I cannot say 100% though. Worse case would be to give the M3 shaft a slight shave.
One thing which can cause a problem is to long thread of the halfshaft. So could be that I have to shave a bit of thread which can stick out to much because of less aggressive offset of the wheel. Other wise I dont see any reason that it would not fit.
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      12-05-2012, 06:12 AM   #181
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Quote:
Originally Posted by GeorgeSmooth View Post
I raised a concern about this as the 135 vs 335 has less play depth wise when pushing the side shaft in hence the M3 one fitting in 335 depth wise. Someone has raised a concern in this regard that attempted the mod on a 135 and for unknown reason it failed. I cannot say 100% though. Worse case would be to give the M3 shaft a slight shave.
Any more info on this sideshaft failure? I did about 3k miles using that setup and don't recall any issues. I have all the required parts off the car for measurement so will hopefully get a comparison of them when I finish work tonight.

The 86mm vs 102mm is the bolt spacing on the diff flanges which is the reason why the m3 side shafts are required.

Even if there is a small amount of preload on the sideshafts, causing the joint to be pushed in slightly I can see this causing problems especially with aggressive launching.

For an unrelated reason I'm actually going to use the m3 hubs so that the whole of my rear subframe except the lower arms (have Bilstein 335i dampers) will be m3 parts including the BBK.
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      12-05-2012, 06:22 AM   #182
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Oh please no! Just got my dct M3 driveshaft delivered - think I'd shed a tear if there's 'complications' Northern Ireland is not a great place for reasonably priced automotive engineering!

The interchangeability of the suspension arms between M3 and us leads me to suspect it'll all be okay for 335i drivers however.
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      12-05-2012, 07:15 AM   #183
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Quote:
Originally Posted by Nigelo View Post
Oh please no! Just got my dct M3 driveshaft delivered - think I'd shed a tear if there's 'complications' Northern Ireland is not a great place for reasonably priced automotive engineering!

The interchangeability of the suspension arms between M3 and us leads me to suspect it'll all be okay for 335i drivers however.
I really drove my car hard after fitting the diff with no issues so I'm hoping that it will ok for you. I've stripped the rear down completely so will hopefully be able to shed some light on the situation. marconi118 did this conversion, so it's interesting to see what he did
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      12-05-2012, 07:16 AM   #184
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Originally Posted by Nigelo View Post
Oh please no! Just got my dct M3 driveshaft delivered - think I'd shed a tear if there's 'complications' Northern Ireland is not a great place for reasonably priced automotive engineering!

The interchangeability of the suspension arms between M3 and us leads me to suspect it'll all be okay for 335i drivers however.
Dont worry everything will be fine because wheel bearings part number are same, wheel carrier in which mounts bearing part numbers are the same and even half shaft number are same 135/335. So if it works for 335 should work on 135 just different part numbers of wheel hubs but that is I think because of different brakes

Sorry just realized that you have 335i... So for you is nothing to afraid of already few 335i cars going on that setup w/o M3 subframe so you are good to go. Just people please who is doing conversions do as much as possible pics.

Last edited by RimasRS; 12-05-2012 at 07:25 AM.
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      12-05-2012, 09:11 AM   #185
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Dont worry everything will be fine because wheel bearings part number are same, wheel carrier in which mounts bearing part numbers are the same and even half shaft number are same 135/335. So if it works for 335 should work on 135 just different part numbers of wheel hubs but that is I think because of different brakes

Sorry just realized that you have 335i... So for you is nothing to afraid of already few 335i cars going on that setup w/o M3 subframe so you are good to go. Just people please who is doing conversions do as much as possible pics.
I didn't get pics the first time around but can do it when I rebuild it. To be perfectly honest, all of it is bolt on except the driveshaft. I fitted the subframe and diff first, then measured the length required for the driveshaft and had it modified. Once the length was right, I bolted it up and it was done. My driveshaft is in my garage so I'll get some pics for those interested. I found that there were many shops here in the UK that specialised in modifying driveshafts including the all important balancing.
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      12-05-2012, 09:38 AM   #186
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I didn't get pics the first time around but can do it when I rebuild it. To be perfectly honest, all of it is bolt on except the driveshaft. I fitted the subframe and diff first, then measured the length required for the driveshaft and had it modified. Once the length was right, I bolted it up and it was done. My driveshaft is in my garage so I'll get some pics for those interested. I found that there were many shops here in the UK that specialised in modifying driveshafts including the all important balancing.
So your 335i shaft goes from gearbox till the joint and then welded with M3 shaft just at the Diff is that correct?
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      12-05-2012, 09:41 AM   #187
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So your 335i shaft goes from gearbox till the joint and then welded with M3 shaft just at the Diff is that correct?
Other way round, I bought an m3 shaft and had the gearbox joint from the 335i welded on at the correct length. Although I'm sure it works the other way too.

I did manage to get do it 4mm too long first time around which meant the guibo was under too much pressure but the shop rectified it the same day.
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      12-05-2012, 10:29 AM   #188
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Originally Posted by idnan View Post
Other way round, I bought an m3 shaft and had the gearbox joint from the 335i welded on at the correct length. Although I'm sure it works the other way too.

I did manage to get do it 4mm too long first time around which meant the guibo was under too much pressure but the shop rectified it the same day.
What about center mount bearing is it same location?
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      12-05-2012, 10:42 AM   #189
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It was for me on the 335i but you will probably have an issue there on your 135i. It might be better to use your 135i shaft and weld the m3 diff flange on. I think Nigelo has the correct flange spare so it might be worth contacting him.
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      12-05-2012, 12:37 PM   #190
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Hey Idnan! How's it going!

Yep Idnan's right - I've a propshaft from another BMW but the diff flange fits the differential perfectly. Won't be using it though as I've now got a dct M3 shaft. Think it was from a e38 or e39 v8 (not M5), so you might be able to pick one up on the cheap locally rather than me sending it to you!
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      12-05-2012, 02:30 PM   #191
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Quote:
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It was for me on the 335i but you will probably have an issue there on your 135i. It might be better to use your 135i shaft and weld the m3 diff flange on. I think Nigelo has the correct flange spare so it might be worth contacting him.
I have already M3 drive shaft + half shaft and diff so I don't need anything else. If my center bearing will not match the M3 drive shaft I will use mine not to make additional holes in car body. + I believe 135 shaft is lighter though maybe not that strong.

BTW if you will be able please add some pics.
Also did you had oem bolts for half shafts and drive shaft to diff?
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      12-05-2012, 02:36 PM   #192
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Hey Idnan! How's it going!

Yep Idnan's right - I've a propshaft from another BMW but the diff flange fits the differential perfectly. Won't be using it though as I've now got a dct M3 shaft. Think it was from a e38 or e39 v8 (not M5), so you might be able to pick one up on the cheap locally rather than me sending it to you!
Do You have bolts and bolt support those things which looks like boomerang? And also should there be gasket number 15 on this diagram http://www.realoem.com/bmw/showparts...02&hg=26&fg=10

I mean there goes bolts those which I call boomerangs and some gasket or just bolts and boomerangs?
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      12-05-2012, 03:12 PM   #193
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Someone make a STICKY already!!!!
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      12-05-2012, 06:17 PM   #194
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Hi RimasRS!

Yes, I have both the boomerang shaped reinforcements and the metal gasket. I was lucky enough that the propshaft came with the 6 bolts included.

I'll soon have time to sort the driveshaft, but it'll be January before I have the cash to pay for the mechanical work. Lots of presents to buy first!
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      12-06-2012, 02:22 AM   #195
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Hi RimasRS!

Yes, I have both the boomerang shaped reinforcements and the metal gasket. I was lucky enough that the propshaft came with the 6 bolts included.

I'll soon have time to sort the driveshaft, but it'll be January before I have the cash to pay for the mechanical work. Lots of presents to buy first!
Ok same thing here though cant wait will do conversion ASAP
Just one more thing according to real oem there should be 3 boomerangs and can you check is there under them metal gasket because I dont see/understand looking to realoem should there be one or not? Can you closely check that on real drive shaft?
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      12-07-2012, 04:37 PM   #196
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Hey, had a look there and there are 3 boomerangs as you call them. It goes on mine:

bolt > boomerang > metal gasket > edge of cv joint

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Ok same thing here though cant wait will do conversion ASAP
Just one more thing according to real oem there should be 3 boomerangs and can you check is there under them metal gasket because I dont see/understand looking to realoem should there be one or not? Can you closely check that on real drive shaft?
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      12-08-2012, 05:43 AM   #197
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Hey, had a look there and there are 3 boomerangs as you call them. It goes on mine:

bolt > boomerang > metal gasket > edge of cv joint
Thank you...

Can you also check one more mysterious washer number 22 here http://www.realoem.com/bmw/showparts...02&hg=26&fg=10
It says install it if yellow or blue dot is presented on mines I found blue dot marked at one of the bolts I guess it has to do something with balance of diff.

Maybe somebody knows where I can find manual about installation of the diff to see what is correct torque of the bolts etc.. Like Bentley manual or something.
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      12-08-2012, 06:19 AM   #198
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i have the blue dot too, then you have to put these mysterious and exensive washers!?

at the end I put no washers and all 6 bolts the same, black ones that have less threaded part, they seem stronger.

normally there should be one f another type, with more tread on it and green or silver colour, but never understood where exactly? near the blue dot?

I don't have any vibration from the diff, but maybe with the right bolt in the right place it would be better?????


BTW I have a complete M3 subframe with arms, carriers and M3 brakes. so for me the M3 dct shaft was the best, had only to shorten to the right length and mate with a 335i gearbox flange (look at realoem for the bolt pattern mm there are 320d auto that have the same flange you could slavage from)
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