View Single Post
Old 04-03-2012, 11:58 AM   #40
Registered User
Join Date: Jan 2008
Location: Northern California; SF BAY
Posts: 263
My Ride: e36 M3 / E30 GTS1
Originally Posted by aggieE46 View Post
I don't really claim to know what I'm doing. Where is the 168/188mm measured?

There shouldn't be any grinding of the case required, but I can't be 100% sure of that until I'm finished.

I don't track my car. I just drive it spiritedly. If the unit doesn't hold up, I've done something more enjoyable and had more of a learning experience than wrapping my interior with Dinoc....

Sounds like you have some experience with where I'm going. Please keep an eye on the thread and let me know what you think.
I have a empty e46 non m case here, I had it clearanced to fit a 188mm LSD center. I can email you a photo if the clearancing required to fit if you really want to know. It's a decent amount. With a ring gear attached and no spacer to adjust the centerline, it still needed clearance of the case. This was a side project to building up a nice os giken aftermarket unit for e46non-m. Took some spares off the shelf and tried to play the retro fit game. I change diff bearings and set ring /pinion gaps for diff builds, so it doesn't scare me.

The e46 cast housing is designed to clearance open diffs for installation.

if you mess with the spacing bolt on top cap of the e36/30 LSD center capsule the spider gear will also need a spacer. This opens up another very expensive/time consuming can of worms. My suggestion? Don't go there.

Perhaps adapting the e30 bearings and races and spacing would be smarter.
The e30/36 stub axels use a different standard e46, the circlip position is different, geometry also. Will the dust shields all line up post if Frankenstein-diffed?

Originally Posted by Hornung418 View Post

Brady, this should definitely be a viable option for non-Ms.

The M3 LSD is so useless with a 3.62. When I repair my subframe this summer, I'll be shooting for a 3.23 LSD, so hopefully this gains some great momentum in the near future!
The e46m unit can be re geared with Oem m division ring and pinion to 3.23 and 3.15 ratio. LSD center can be clutch type or gin visco-lok. I just built one up for turbo use (3.15 e46m clutch LSD diff). This would allow non m cars to Pnp a LSD in matching ratio to a 6500 rpm engine with a m3 rear subframe swap.

The e46m rear diff can be configured with genuine BMW parts to have a 4 bolt front flange that will mate with non m 4 bolt driveshaft 4 bolt pattern, this would allow upgrade of e46m of diff without buying a zhp 6 bolt driveshaft

Also the late model 2005/6 325ci/cabrio 6 speed SMG cars have a 4 bolt driveshaft in 6 speed length, they run a ZF 6 speed gearbox with identical length and mounting position in the body to the e46m gearbox.
Billet Original CNC LSD for 188K

S54B32 E36 M3 DTA S100 Sedan Street car full swap:

E30 M20 2,7L Alpina + Euro E46 320D ZF 6 speed install

Last edited by wanganstyle; 04-03-2012 at 12:09 PM.
wanganstyle is offline   Reply With Quote