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      05-09-2017, 12:11 AM   #67
vtl
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What final drive ratio did you get in your M3 diff?

The two choices are 3.15 (M3 DCT) and 3.85 (M3 manual). The stock auto 3.46 ratio is pretty much in the middle. I guess no one would want to make their car slower so youd have to get a 3.85 for auto

Mines a manual(3.08) and I chose a 3.15 differential which gives me around 2.2% change vs stock which is quite negligible. I'm quite glad for this as I find the stock gearing to be fine and didn't want to change it.
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      05-11-2017, 02:30 PM   #68
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The doner car was a Manual so I got the 3.85. Finding this thing was pretty tough and when I finally did and saw that it had solid bushings, upgraded diff bushings, and braided Lines I had to jump on it! Hopefully its not too big of a difference but if so Ill be dropping the diff for a rebuild and re-gear. The swap starts tomorrow night and Im hoping to have it rolling by Saturday. The driveshaft has me a bit weary as the driveline shop near my shop, which Ive used before refuses to modify the shaft as its friction welded from the factory which leaves little to no material to weld to. I have another place lll be checking out but I have a race the following weekend so shell be sitting in the shop with all our Porsches for a few weeks unless my fabricator is willing to make the mods and I can some how talk my driveline guy into balancing it on Monday
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Last edited by sean5000; 05-11-2017 at 02:33 PM.. Reason: added more
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      05-11-2017, 05:54 PM   #69
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Quote:
Originally Posted by sean5000 View Post
The doner car was a Manual so I got the 3.85. Finding this thing was pretty tough and when I finally did and saw that it had solid bushings, upgraded diff bushings, and braided Lines I had to jump on it! Hopefully its not too big of a difference but if so Ill be dropping the diff for a rebuild and re-gear. The swap starts tomorrow night and Im hoping to have it rolling by Saturday. The driveshaft has me a bit weary as the driveline shop near my shop, which Ive used before refuses to modify the shaft as its friction welded from the factory which leaves little to no material to weld to. I have another place lll be checking out but I have a race the following weekend so shell be sitting in the shop with all our Porsches for a few weeks unless my fabricator is willing to make the mods and I can some how talk my driveline guy into balancing it on Monday

The guy I took my propshaft to lived 2 streets away from me and did it all in a shed at the back of his house. He did it properly, he cut the flanges off, mounted them in a lathe and machined them down so they fit inside of the propshaft tubing. It was then conventionally welded up on a rotating jig. Its definitely possible to do it properly.
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      05-15-2017, 04:41 PM   #70
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Well I got everything in by Saturday. I still need to adjust ride height. I started at the lowest and will be raising that soon. My 275 rear tire rubs and full droop so my next set will probably be a 265. Driveshaft needs to be taken to a drive shaft shop in Oceanside which is about an hour and half drive from me. but they seem knowledgeable and willing to do what I need

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      03-20-2018, 11:41 AM   #71
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Custom Drive shaft

What company's have made a custom carbon drive shaft for this application, 2008 135i n54 with m3 rear end?
I need one done
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      10-21-2018, 11:19 PM   #72
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Does someone know if a X5 E53 driveshaft would work, it measures 1325mm.
Part # is: 26107549305
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      10-21-2018, 11:41 PM   #73
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Total length it might actually fit, but its unlikely the centre bearing is in the correct position
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      07-23-2019, 06:34 AM   #74
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Hello, i follow this good thread and i have to do a custom pro shaft but i decided to do with most of the M3 parts so this what i plan to do :


https://image.noelshack.com/fichiers...dif-arbres.jpg


What do you think about that?

I also did a modification of the bearing : i use M3 rubber mount cause it's harder than the 135I :


Last edited by vincefreeflyer; 07-23-2019 at 06:47 AM..
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      08-08-2019, 05:30 PM   #75
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Quote:
Originally Posted by vincefreeflyer View Post
Hello, i follow this good thread and i have to do a custom pro shaft but i decided to do with most of the M3 parts so this what i plan to do :


https://image.noelshack.com/fichiers...dif-arbres.jpg


What do you think about that?

I also did a modification of the bearing : i use M3 rubber mount cause it's harder than the 135I :

did you figure out what you wanted to do
?
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      09-10-2019, 04:49 PM   #76
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hey @VTL i just wanted to follow up, this thread was very helpful to me. i commented on it back in 2015 when i picked up all my m3 stuff. just finially installed the rear end about 2 months ago. found a local driveshaft shop that welded the m3 flange on the end of my prop shaft and i used your diagram with the measurements for length. bolted up and everything works great! aside from the fact i installed the 3.85 diff.. located a 3.15 and installed it last week. all is well. just have some clunking going on i have to figure out.
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      09-10-2019, 05:20 PM   #77
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Quote:
Originally Posted by mistawall View Post
hey @VTL i just wanted to follow up, this thread was very helpful to me. i commented on it back in 2015 when i picked up all my m3 stuff. just finially installed the rear end about 2 months ago. found a local driveshaft shop that welded the m3 flange on the end of my prop shaft and i used your diagram with the measurements for length. bolted up and everything works great! aside from the fact i installed the 3.85 diff.. located a 3.15 and installed it last week. all is well. just have some clunking going on i have to figure out.
Great to hear you got it in!
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      09-10-2019, 07:05 PM   #78
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Quote:
Originally Posted by mistawall View Post
hey @VTL i just wanted to follow up, this thread was very helpful to me. i commented on it back in 2015 when i picked up all my m3 stuff. just finially installed the rear end about 2 months ago. found a local driveshaft shop that welded the m3 flange on the end of my prop shaft and i used your diagram with the measurements for length. bolted up and everything works great! aside from the fact i installed the 3.85 diff.. located a 3.15 and installed it last week. all is well. just have some clunking going on i have to figure out.
How'd you like the 3.85 vs 3.15?
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      09-20-2019, 02:49 PM   #79
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Originally Posted by gmagnus7 View Post
How'd you like the 3.85 vs 3.15?
ahhh basiclly redlining at 140mph in 6th with the 3.85... not ideal. 3.15 is much better. feels stock. but i think i need to rebuild it afterall.. got some weird noises when i turn slowly.

dont get me wrong though the 3.85 was fun around town. highway was a drag tho.
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      09-29-2020, 01:52 PM   #80
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Quote:
Originally Posted by vtl View Post
Updated the drawing, I had measured from the edge of the diff flange, but the CV joint actually sits in a machined cutout. Propshaft is 4mm longer, resulting in 1325mm total, EXACTLY the same measurement as the dimension I calculated from realoem!

New PDF attached
Is this measurement including the flex disc or without it?
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      04-21-2023, 12:55 PM   #81
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I looked into this and pulled the trigger on a system from and e92 m3 DCT, with the gearing ratio of 3.15 bc it’s similar to ours at 3.08. The guy I bought it off of also included the m3 subframe which I also thought about swapping in. To do this job yourself it looks difficult and the labor to do it really isn’t worth it. My uncle was a mechanic at Peter Pan bmw in San Mateo for years, he now has his own shop and he’s been doing bmws and mercs for almost 30 years. To do everything right you’d need to get bushings for the new subframe a full m3 control arm and tow arm conversion on top of getting the driveshaft cut and custom welded. I only paid 1k for all the diff parts but I was told installing it with lab and new parts could be close to 5k which is almost worth half the money of these cars. Unless you plan to keep this car long term I personally don’t think it’s worth it. Still cheaper than a ford 8.8 lol but the cost isn’t worth the value you’d be adding to the car making it a Frankenstein m in a way. I’ve never driven our cars with an LSD so I can’t tell u the difference but it’d probably be better to sell save up and get an m2 comp which already has an LSD and a better motor imo.
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