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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-03-2012, 03:33 PM   #41
Hornung418
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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?




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.
So I can take the ring and pinion from a 3.15 open diff and swap it to the M3 rear and it will reinstall it with perfect fit?
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Old 04-03-2012, 08:05 PM   #42
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So I can take the ring and pinion from a 3.15 open diff and swap it to the M3 rear and it will reinstall it with perfect fit?
You need the right R+P, not just any E46 R+P

And it's not as easy as just swapping over. Lots of work to swap them.
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Old 04-03-2012, 08:19 PM   #43
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You need the right R+P, not just any E46 R+P

And it's not as easy as just swapping over. Lots of work to swap them.
So do you have links to these special Ring and Pinions?
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Old 04-04-2012, 05:08 AM   #44
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Old 04-09-2012, 12:55 PM   #45
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Subbed!

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 E46 M3 ring and pinion fits in the E39 M5 diff, so I would think the E39 M5 r&p would fit in the E46 M3 diff. If that's the case, you'd be able to get a 3.15 ratio.
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Old 04-11-2012, 05:02 PM   #46
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Interesting stuff!

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Old 04-11-2012, 05:55 PM   #47
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I'll probably sound like a broken record here but unless you're an expert on these differentials, they are best left to a pro like Dan at Diffsonline or Metric Mechanic. There are so many little things to setting these up. If you screw up one of them you're going to toast some expensive parts.
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Old 04-15-2012, 10:43 AM   #48
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I'll probably sound like a broken record here but unless you're an expert on these differentials, they are best left to a pro like Dan at Diffsonline or Metric Mechanic. There are so many little things to setting these up. If you screw up one of them you're going to toast some expensive parts.
why even bother posting? I'm pretty sure this thread is just figuring out how to swap a E30/E36 unit into a E46. I think majority of the people in here know about professionals and what they can do.
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Old 04-15-2012, 11:23 AM   #49
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I'll probably sound like a broken record here but unless you're an expert on these differentials, they are best left to a pro like Dan at Diffsonline or Metric Mechanic. There are so many little things to setting these up. If you screw up one of them you're going to toast some expensive parts.
How do you become an expert sir?

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Old 04-24-2012, 08:12 PM   #50
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Any progress updates? If this is successful I wanna try retrofitting the older lsd in my car.
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Old 04-24-2012, 08:27 PM   #51
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Well, I've run into a snag and I just haven't done anything about it. There are several allen head bolts that hold the "cap" on the unit. They are all stripping. All of them. I'm sure I could drill them, pop the heads off, and extract. I'm just not excited about doing that. I have a couple other projects that have gotten in the way and are taking what little cash I have to put towards the project. Trying to get a few things done for a dyno and then needing to get some money put away for a bit of tig welding on my exhaust.

This project isn't dead, just a little on hold.
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Old 04-25-2012, 06:38 AM   #52
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why even bother posting? I'm pretty sure this thread is just figuring out how to swap a E30/E36 unit into a E46. I think majority of the people in here know about professionals and what they can do.
You become an expert by trying things and failing. Which is great and I'm all for that approach, except that the OP stated that his goal was to save money.

Ultimately I think it will cost less money and be much less of a headache to just save up to buy an OSG that fits the E46 case and then teach yourself how to put it in.
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Old 04-25-2012, 01:27 PM   #53
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Since this is an active thread with some knowledgeable people posting in it, I'm curious as to how much lock-up you can modify to a stock M3 LSD. I've found 210mm 3.15 R+P for e39 M5s on eBay for $125, and it's a direct swap to the M3 case. But the OEM lock-up is pretty tame at 25%. So is it possible to add some extra clutch plates with out having to modify the shims?
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Old 04-25-2012, 03:29 PM   #54
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Managed to get one of the bolts out by drilling. At least I know the size, now. I'm going to pick up a couple new bits and remove the rest and pull out the internals. Hopefully I can get it in for a little milling soon.

Brady
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Old 04-26-2012, 10:07 AM   #55
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Okay, a little progress. I took a suggestion about using a mean pair of vise grips. Bolts are off. They'll have to be replaced, anyway.

Popped it open:


Inside-out. It was in there pretty tight:


Everything kept in order:


I was worried a little about how everything would look. Aside from the nasty smell of gear oil, I think it's pretty clean. I'll clean everything up and send some pictures to Mr. Wizard to make sure everything is up to snuff. Now I need to get it to the machine shop for a little work.

Enjoy the small update.
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Old 04-26-2012, 10:41 AM   #56
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whoo! looks good!

let's hope this works!

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Old 04-26-2012, 11:15 AM   #57
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That's some exciting stuff!
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Old 04-26-2012, 05:30 PM   #58
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Progress progress. Yippie!

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Old 04-27-2012, 10:42 AM   #59
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Had a few minutes this morning to clean up the internals:

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Old 04-27-2012, 11:12 AM   #60
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ooh, perty...
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