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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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      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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