OBX Helical LSD

[asubimmer]

Why not just upgrade to a large case? Won't you be needing it with the turbo anyway?

yup....I was gonna get a 3.73lsd for $35 and it didn't work out lol

[matt]

anybody have a reason why 325e's and 328i's supposedly have the same diff, yet it's different than e30 and e36 325i's.

I think I'm gonna guinee pig this but I want to make sure this company knows at least something about BMW fitment before I spend $400.

Huh? All 6 cylinder e30s and e36s (except euro M3) have the same diff *size* (different case, same LSD will fit, except e36 M3)

[Mr Deagle]

ot, but can you put limited slip clutches in a non lsd case? like is there the provision for it?

[matt]

You have to swap the whole differential. The inner part. The cases are the same.

[325Projectz]

Huh, I was looking at these tonight on the bay... Then I run across this thread.

Well if no one buys one anytime soon, I'd be up for the job, but that won't be for another 2 months or so.

[golde30]

OBX Is local to me. i have been to their shop a few times as my buddy buys wholesale from them. maybe i will hitch a ride with him next time and pick their brains about these units.

[325Projectz]

Hitch a ride to their warehouse and put one in your pocket. Report back.

[Jean]

OBX Is local to me. i have been to their shop a few times as my buddy buys wholesale from them. maybe i will hitch a ride with him next time and pick their brains about these units.

Do it. I asked a buddy of mine who is heavily into drag racing and said some guys do run them in fwd imports w/o trouble but couldn't get any more info... lame.

[ummagawd]

i'm ready and willing to experiment with this but I have a few hurdles,

1 - i have a 92 318ic and thus have the 4.27 open diff... i'm not sure they make one that works...

2 - if they do make something (or i somehow get my hands on a medium case 4.1 diff)... i would need someone with the proper tools to install it into the diff (i can install the actual diff itself into the car)

and then i can report back my findings... and trust me... i'll try and break it

[xLibelle]

the regular lsd works just fine

though i would love to learn how to service them

[matt]

the regular lsd works just fine

though i would love to learn how to service them

WR has one out of the case... haven't gotten around to messing with it yet. Probably this summer.

[DJB]

the regular lsd works just fine

though i would love to learn how to service them

From what I've read, the key tool to service diffs is a bearing drag measurement tool. You have to tighten the pinion nut until the torque needed to spin the input shaft at 30rpm matches the specified value. That's not a tool that you'll find at your local store.
About the only way I can think of quickly making one is combining a battery screwdriver/drill set to 30rpm with a beam-type torque wrench.

You'll also need a complete set of shims for both the pinion position and the output flanges. The BMW list price on a "set" isn't cheap, especially if you'll need several sets for each diff.

[moatilliatta]

if you get 80 people to donate 5 dollars each to me... ill try it

[matt]

From what I've read, the key tool to service diffs is a bearing drag measurement tool. You have to tighten the pinion nut until the torque needed to spin the input shaft at 30rpm matches the specified value. That's not a tool that you'll find at your local store.
About the only way I can think of quickly making one is combining a battery screwdriver/drill set to 30rpm with a beam-type torque wrench.

You'll also need a complete set of shims for both the pinion position and the output flanges. The BMW list price on a "set" isn't cheap, especially if you'll need several sets for each diff.

All you need to measure pinion drag is a fine 0-20in/lbs torque wrench.

We always measure rear ends and order the proper shims here at work. I don't think a whole set is needed in stock to setup a diff.

I believe he's talking about servicing an LSD unit, not the entire diff itself.

[sumyungguy]

Honda guys have been using them for a while, they haven't had any problems.

Theres even a OBX LSD FAQ thread on Honda-tech.. HERE

read through it and check out the links...