M-Roadster swap

racepad · 11-01-2005, 04:33 PM

Hi,

I have an entire rear end from a 2000 M Roadster from the Diff to the brake rotors. I would like to swap this into the car with a future M3 engine swap in mind. Has anyone mated up this Diff to the existing drive shaft?

David

Silver00spike · 11-01-2005, 09:45 PM

make sure it has the same number of bolts

racepad · 11-01-2005, 09:50 PM

I presume you are referring to the flang on the Differential (6 vs. 4)?

96cali · 11-02-2005, 04:25 AM

To answer your Q a member named J!m did just what you are suggesting a couple years back. I have not seen him post in many months though. Very knowledgable but time crunched. Email him and see if he can give a few tips.

BTW how did you find an M rear and how much did you pay?

cali-ti · 11-02-2005, 04:44 AM

people have swapped the e30 LSD into an m-coupe/roadster so i can't imagine that it's not a 4-bolt diff/driveshaft flange on the front of the m-roadster diff.

the ti parking brake cables won't work from what i remember of others' posts. i'd put in poly subframe bushings while you're doing it too.

racepad · 11-02-2005, 03:34 PM

Hi,

Thanks for the tip on the ebrake cables. It is tedious but I know what to do there. The M-roadster diff has a 6 bolt flange for the drive shaft.

cali-ti · 11-02-2005, 03:51 PM

hmmmm ... so i guess you'd need to either change the flange or the driveshaft. yuck.

that said, if/when you get it swapped, it would be great to have a notebook article on the swap of the complete m-roadster/coupe rear (including e-brake changes, hydraulic brake lines, etc). i still need to put one together for the e30 LSD swap.

racepad · 11-02-2005, 05:04 PM

there is a decent writeup in the notebook section on the E30 diff and what to do there. Yeah, it looks like I will either have to find a drive shaft or change the flange to use this diff.

Got the setup from The Euro Depot (www.theeurodepot.com) in Concord, NH. These rarely come up for sale. They cut me a good deal and can't share the exact price. They are straight up guys and stand behind the parts they sell (new or used). A good source to check out when you are looking for parts. Enough on the plug ;-)

I will keep track of the project and post in the notebook and my web site as it comes along. It will be a while before I do this as I need to figure out what will work and there is little to go on here.

cali-ti · 11-02-2005, 05:24 PM

Quote:

Originally Posted by racepad

there is a decent writeup in the notebook section on the E30 diff and what to do there.

i ran into a number of issues when doing the swap (in fact, i think i found every possible problem!) so i wanted to provide more info regarding the swap, tools i used, etc.

KIRASIR · 11-03-2005, 07:42 AM

You just need to swap the flange (the driveshaft from 2.8l / M car won't fit your ti).

Quote:

Originally Posted by racepad

there is a decent writeup in the notebook section on the E30 diff and what to do there. Yeah, it looks like I will either have to find a drive shaft or change the flange to use this diff.

Got the setup from The Euro Depot (www.theeurodepot.com) in Concord, NH. These rarely come up for sale. They cut me a good deal and can't share the exact price. They are straight up guys and stand behind the parts they sell (new or used). A good source to check out when you are looking for parts. Enough on the plug ;-)

I will keep track of the project and post in the notebook and my web site as it comes along. It will be a while before I do this as I need to figure out what will work and there is little to go on here.

racepad · 11-03-2005, 02:30 PM

What flange to use? part number or from what other car/diff? thanks.

cali-ti · 11-03-2005, 02:43 PM

i'll tell ya too, i was looking to refresh the front flange seal on my e30 diff and when i looked at what it was going to take to get it off, i said "forget it!" that nut has to be torqued VERY HIGH. you'll need to rig something up to even get it off. i have pics of what i was going to TRY to use to get it off (let me know if you want to see them). i don't think my torque wrench even went high enough (or it was near its limit).

racepad · 11-03-2005, 04:56 PM

Fortunately I have a high torque impact gun that should take it off. I also have a torque wrench that will go up up high enough. Worse case I have some friends in the the area that can do this if I can't. Just need to identify the right flange to use.

cali-ti · 11-03-2005, 05:12 PM

the trick is finding a way to keep it from turning as you take the nut off. my idea for doing that is what i have pics of.

racepad · 11-04-2005, 02:20 PM

Did a lot of surfing and found this picture

http://www.unofficialbmw.com/images//new346-23.jpg

I thought it was odd that the six holes on the input flange were not evenly spaced. Here is a pic of the roadster diff and one can see that despite six holes only 4 are used. This potentially a great break through which woudl mean that the roadster diff might just bolt right up to the existing drive shaft. I plan on jacking up the 318ti this weekend to take a look and see what's there now.

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