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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 06-13-2010, 02:43 PM   #181
JimmyOberg
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This is one way to get a LSD E46 non-m.

E30 188 diff vs E46 diff.


E36 Diff cover


These are also from E36, And fits fine with the E30 diff and E46 halfshafts.


New mounting brackets...




Then I guess you're ready to go.

Last edited by JimmyOberg; 06-13-2010 at 02:44 PM.
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Old 06-13-2010, 03:47 PM   #182
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WOW!

so you modified the subframe to fit an e30 diff?

can you please elaborate?!!!!!!!!!!!!!

...i knew there were guys that have retrofited lsd's into their cars, but everyone keeps about it. lol
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Old 06-13-2010, 07:31 PM   #183
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damn.... lotta work but it gets the job done.
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Old 06-13-2010, 08:08 PM   #184
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wow thats pretty sweet, i never thought of doing that, maybe thats what ill do to the 323ci
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Old 06-14-2010, 01:53 PM   #185
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Originally Posted by SL Blak Soldier View Post
WOW!

so you modified the subframe to fit an e30 diff?

can you please elaborate?!!!!!!!!!!!!!

...i knew there were guys that have retrofited lsd's into their cars, but everyone keeps about it. lol
It's not my car.

I can ask Patrik who is the owner if he can do a little write up of how it's done... And I can try to translate it. Or if he see's this thread maybe he will post some info himself, I know he has an account here.
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Old 06-14-2010, 04:07 PM   #186
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It's not my car.

I can ask Patrik who is the owner if he can do a little write up of how it's done... And I can try to translate it. Or if he see's this thread maybe he will post some info himself, I know he has an account here.
Well, its not that hard doing the 188 diff installation into the E46 subframe as you may think. I`ve investigate lots of alternatives when I build my E46 325ti race car. There is some options from BMW Motorsport and Drexler that fits right into the E46 diff housing that were used in supertouring, but its pretty expensive. The 210 diff from M3 is to heavy and dont work that smooth as the 188. Quaife could work, but this is no alternative for me due to the functionality. I had a couple of 188 diff`s in my shop "over" from previous race car builds so my option was pretty easy

I will post some pictures and try to explain how to do this operation.

Take some measurments and notice that the 188K (E46) diff`s input shaft/output shaft dont center as the 188 (E30) diff.

Its important that the 188 diff center based on the drivshafts not based on the input shaft.

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When you have all the measurments, its time to fix the subframe into a "rigg" or something and start to manufacture the new mounting points.

Some pictures from the first modification i made:

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From the second one:

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The E30 output shaft will fit the E46 drive shaft with just a little modification.

Finally, some pictures from me and my brothers race cars E36ti and E46ti

last year setup:
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this year:
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Old 06-14-2010, 04:20 PM   #187
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Wow!

Great work man! Love the ingenuity! That's a pretty good alternative to going with an aftermarket lsd. Relatively cheap also.... as long as you have some welding skills.

Great job!

-Raj
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Old 06-20-2010, 07:12 PM   #188
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That just seems like 100X the work over taking out an existing diff, sending it out, receiving it in a week and reinstalling it. Jim at Performance Gearing installed his first e46 LSD in my car back in 2000. The first two burned up and the third one worked like a champ. That diff lasted from 2002 to 2008. Then the diff ran 2 hours at Mid-Ohio with no oil in it (the left axle came out of the diff). At that point, it needed to be replaced. That diff lasted 25,000 miles of Grand-Am competition without a diff cooler.

With all of the options out there to just send the diff out, I don't understand why you'd want to modify the subframe to install another type of diff for a regular old track car.

Since Jim has been installing LSD's in e46's for 10 years, he probably has plenty of experience to get you what you need and something reliable.

If you want a real challenge, try installing a M5 diff into an e46 m3 with a one piece Pankl driveshaft attached to a Hewland gearbox.
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Old 06-20-2010, 09:36 PM   #189
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I don't know about everyone else, but I can't afford to send out my diff. the e36 lsd I picked up cost me $100. Add at most another 150 for machining a new end flange and another 100 for getting the backlash adjusted correctly and I should have have an lsd for well under the $1500-$2000 that the aftermarket units cost. It's not like I need it to hold up to constant track abuse, just spirited driving and the occasional autocross event.
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Old 06-20-2010, 09:57 PM   #190
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There's still more to it than that.

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Originally Posted by tinkwithanr View Post
I don't know about everyone else, but I can't afford to send out my diff. the e36 lsd I picked up cost me $100. Add at most another 150 for machining a new end flange and another 100 for getting the backlash adjusted correctly and I should have have an lsd for well under the $1500-$2000 that the aftermarket units cost. It's not like I need it to hold up to constant track abuse, just spirited driving and the occasional autocross event.
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Old 06-20-2010, 10:03 PM   #191
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Is there something major I'm missing? I'm not trying to like a douche, just want to see if what you've researched match up with what I've figure out so far.
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Old 06-20-2010, 10:06 PM   #192
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I gotta say, i'm just totally confused on what you guys are talking(arguing) about.

I think mr.shelly was talking about why do all the modification to the subframe to fit an e30 lsd, instead of just getting an carrier?

I'm not sure what Brady is implying.
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Old 06-20-2010, 10:13 PM   #193
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There's quite a bit that I've gotten from a GOOD source, but he's asked me not to share his name. You can't just shift over the LSD unit, it'll be off center. You not only need to shim the casing, but you'll need to have the other side bearing seat ground down. You'll need to shim the internals to make up for the shift in center. You'll need to do something about there not being circlips inside the e36 unit to clip in the stub shafts. Also, if you're using a 3.15 or higher, you'll need a spacer plate for the pinion gear.

I'm still debating if I want to do all of this, although it would be fun and cool, or just scrap it. I'm actually at a crossroads with my car and life situations, so I may be rethinking some of my plans.

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Is there something major I'm missing? I'm not trying to like a douche, just want to see if what you've researched match up with what I've figure out so far.
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Old 07-11-2010, 09:11 AM   #194
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this has been the most disappointing thread i have followed in a very long time
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Old 07-11-2010, 11:32 AM   #195
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this has been the most disappointing thread i have followed in a very long time
Why? Have you posted up quality content and had people say it wasn't any good? That kind of disapointing?

Please clarify.

I have found this thread packed with neat information...and I'm not "new" to E46 diffs....
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Old 07-14-2010, 10:53 PM   #196
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their whole deal is they cnc'd a piece that i saw was taller then that pictured above. long enough to push the whole unit to one side so that both sides sits flush and perfect.
There is a problem with this. The splined flanges that bolt to the driveshafts go through the differential casing and engage a mating spline inside the differential itself. If you are shifting the differential to one side, as your differential shop has suggested, you are reducing the depth to which the flanges on that side of the different can engage the splines in the differential. If you don't have enough contact area (i.e. depth), you can strip out the splines on a hard launch (etc.).

In my opinion, this isn't a good idea. I'm with the guy saying that it's a good idea to buy a purpose built limited slip unit.

Last edited by B6T; 07-14-2010 at 10:54 PM.
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Old 07-14-2010, 10:57 PM   #197
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This is one way to get a LSD E46 non-m.

E30 188 diff vs E46 diff.
Tell me if this is possible:

Swap the rear covers from from the E46 differential to the E30 differential. Design/machine a pair of brackets that spans between the two mounting pads on the top of the E30 diff that provides a mounting boss in the position compatible with the E46 subframe.

This is the approach i would attempt.
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Old 07-15-2010, 08:37 PM   #198
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Why? Have you posted up quality content and had people say it wasn't any good? That kind of disapointing?

Please clarify.

I have found this thread packed with neat information...and I'm not "new" to E46 diffs....
The information in this thread has been amazing and the effort was great so far...

the only disappointing part is the LSD never got complete with the e36 guts..
Thats all.

no disrespect to the all those who posted information. I just really hope someone can complete this project
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Old 09-08-2010, 07:44 PM   #199
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All good stuff. Big thumbs up to all that have contributed information. The swaping in the E30 diff got me thinking. Any other diffs that would fit? Changing the mounts isn't really all that difficult if one can weld (I can).

Would like to see the end results on the changing the internals of the E46. Are there any other BMW internals that would fit better? Anyone tried E30 guts?

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Old 09-08-2010, 07:49 PM   #200
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E30 guts are the same as e36 guts
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