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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 01-27-2010, 08:52 PM   #61
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Quote:
Originally Posted by tim330i View Post
This is a really cool thread! It looks like the LSD center section ring gear mounting flange is larger than the open, could you just machine that down or does it hit on the ring gear itself? Seems like taking a little off the ring gear wouldn't be a huge deal.

Tim
good idea, but it his the ring gear itself. I mean machining it down would be okay to mock up, but if i were to have the ring gear on it, it would still hold it back.

damn you Brady, you got me all hyped up on this now!
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Old 01-27-2010, 09:06 PM   #62
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Make it happen!

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good idea, but it his the ring gear itself. I mean machining it down would be okay to mock up, but if i were to have the ring gear on it, it would still hold it back.

damn you Brady, you got me all hyped up on this now!
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Old 01-28-2010, 08:41 PM   #63
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SOOOOOo i did work today. I'll upload pics maybe later tonight, but i just wanted to give you guys a jist of what i did today.

As far as the problem i thought i would have a couple of post up, it shouldn't be a problem as from the factory the housing cuts into the bearing seat already, so I think as long as I keep it a clean edge, i should be okay.

I also got the carrier into the housing!!! no ring gear just yet, but the carrier is in there. I need to grind some more down to get the ring gear to fit in with the carrier.

One issue i noticed was that the open diff is a tad bit longer (output shaft bearing to output shaft bearing) than the lsd. It's a total of about 1/4 of an inch. So about an 1/8th on each side. But i also noticed that the bearings on the open aren't flush mounted like the lsd ones are. So i might be able to pull out about a 1/16th on each side by not flush mounting the bearing (and make it like the open). So i'd have a difference of a 1/16th on each side that i'm still short. Will it be a problem? i have no clue how close tolerances on diffs have to be. I'll have more pics to show you guys exxactly what i mean, if you guys are confused.


Eitherway, pics will be up soon.
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Old 01-28-2010, 09:44 PM   #64
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this is awsome, you very well know if you get this down, i'll be one of the first to get this done...
maybe aggie will beat me to the punch
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Old 01-29-2010, 07:02 AM   #65
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Interesting observation. I wonder if one of our resident know-it-alls can come in and help out with this one....
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Old 01-29-2010, 08:19 AM   #66
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Originally Posted by SL Blak Soldier View Post
SOOOOOo i did work today. I'll upload pics maybe later tonight, but i just wanted to give you guys a jist of what i did today.

As far as the problem i thought i would have a couple of post up, it shouldn't be a problem as from the factory the housing cuts into the bearing seat already, so I think as long as I keep it a clean edge, i should be okay.

I also got the carrier into the housing!!! no ring gear just yet, but the carrier is in there. I need to grind some more down to get the ring gear to fit in with the carrier.

One issue i noticed was that the open diff is a tad bit longer (output shaft bearing to output shaft bearing) than the lsd. It's a total of about 1/4 of an inch. So about an 1/8th on each side. But i also noticed that the bearings on the open aren't flush mounted like the lsd ones are. So i might be able to pull out about a 1/16th on each side by not flush mounting the bearing (and make it like the open). So i'd have a difference of a 1/16th on each side that i'm still short. Will it be a problem? i have no clue how close tolerances on diffs have to be. I'll have more pics to show you guys exxactly what i mean, if you guys are confused.


Eitherway, pics will be up soon.
you would have to put some shims under the bearing, so the carrier does not "slide" sideways when under load. but like you say, the open diff is not flush mounted, are the bearings somewhat close ended?

shims would also allow you the opportunity to adjust tooth contact pattern.

don't forget to check pinion depth too.
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Old 01-29-2010, 09:26 AM   #67
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YES!

Keep updating, if you get this to work, I'll be doing the same.
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Old 01-29-2010, 02:45 PM   #68
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Excuse the pics it's kinda hard shooting while propping up the diff with one hand.

Just to give you a rough idea... LSD vs Open

LSD pictured here




Open




Open Vs LSD Height




Close-up




Open Diff Bearing. *note how the bearing sits a bit higher than lsd.




LSD Bearing




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Old 01-29-2010, 02:47 PM   #69
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Are the bearings themselves taller? They look to be. Can you pull them off and swap them? If so, that might save someone a little grinding, too. If I'm wrong, sorry, I can't tell from the pics. Great work, though. You may need a new sig pic, soon!
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Old 01-29-2010, 02:53 PM   #70
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you would have to put some shims under the bearing, so the carrier does not "slide" sideways when under load. but like you say, the open diff is not flush mounted, are the bearings somewhat close ended?

shims would also allow you the opportunity to adjust tooth contact pattern.

don't forget to check pinion depth too.
yeah, i have to pretty much read up on all of that stuff. I think one of my friends used to install carriers into housings so hopefully he'll know how to check the pinion depth, and shimm it out correctly. If not i have to find someone local who can do a proper job for me.

I also don't understand what you mean about close ended. but i just uploaded pics.

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Are the bearings themselves taller? They look to be. Can you pull them off and swap them? If so, that might save someone a little grinding, too. If I'm wrong, sorry, I can't tell from the pics. Great work, though. You may need a new sig pic, soon!
No, the bearings look to be about the same size.
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Old 01-29-2010, 02:56 PM   #71
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Man, you're right there with this project.... Hard part is done! You might need to order a finned cover and some good shockproof fluid, soon!
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Old 01-29-2010, 03:51 PM   #72
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Man, you're right there with this project.... Hard part is done! You might need to order a finned cover and some good shockproof fluid, soon!
yeah, since i got hte carrier in the housing, it seems like it's a very plausible solution for lsd.
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Old 01-30-2010, 12:52 AM   #73
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this is one of the most interesting posts i've seen in awhile.
Keep up the great work.
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Old 02-01-2010, 04:37 AM   #74
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okay, so i've been toying with the idea of fully rebuilding the diff (if i can get it to fit correctly) & adding a clutch to increase the lockup ratio.

I found this thread and i thought i'd be interesting for a few of you here.

http://www.r3vlimited.com/board/showthread.php?t=92714

^lsd breakdown. e30/e36 run this same lsd, so i'm sure it's almost exactly the same.

btw i'm probably not going to be rebuilding it myself.
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Old 02-01-2010, 05:47 AM   #75
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Interesting observation. I wonder if one of our resident know-it-alls can come in and help out with this one....
wtf, i thought thats who you & AdamBath were!
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Old 02-01-2010, 01:22 PM   #76
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You're planning on installing and testing for a while first, right?

Neat idea, though.



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okay, so i've been toying with the idea of fully rebuilding the diff (if i can get it to fit correctly) & adding a clutch to increase the lockup ratio.

I found this thread and i thought i'd be interesting for a few of you here.

http://www.r3vlimited.com/board/showthread.php?t=92714

^lsd breakdown. e30/e36 run this same lsd, so i'm sure it's almost exactly the same.

btw i'm probably not going to be rebuilding it myself.
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Old 02-01-2010, 01:54 PM   #77
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You're planning on installing and testing for a while first, right?

Neat idea, though.
that's the thing, i know if i don't rebuild it before i install it, it probably won't come out unless i upgrade. But probably testing it out is better than dropping all my money in it before i know it works for sure.
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Old 02-01-2010, 01:56 PM   #78
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Yeah, definitely test it out first. Don't throw another variable into the equation. Get it tested out first.

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that's the thing, i know if i don't rebuild it before i install it, it probably won't come out unless i upgrade. But probably testing it out is better than dropping all my money in it before i know it works for sure.
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Old 02-01-2010, 07:35 PM   #79
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^ yes. And soon, because I've started my hunt for a good deal on an e36 lsd already. :lol:
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Old 02-01-2010, 08:57 PM   #80
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good work so far man
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