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Old 10-31-2009, 02:48 PM   #31
Mystikal
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Well an LSD of any ratio is an upgrade from your open diff. But with the M50 manifold and tune, you'll be having a lot of fun with the shorter gearing.
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Old 10-31-2009, 03:44 PM   #32
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Very true, which bolts are we talking about exactly? The ones I should replace.
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Old 11-02-2009, 12:38 PM   #33
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The main bolt on the front of the diff. If you pull up the diagram on realoem.com you'll see exactly which one it is.
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Old 11-02-2009, 01:40 PM   #34
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I've gone through a couple diffs, I love my 3.38, I'd only go to something like a 3.46 or 3.73 if I had a 6spd transmission. Definitely replace the long diff bolt, and consider replacing the halfshaft torque bolts, or at least make sure they're properly torqued and locktighted.

You'd be surprised how much torque there actually is going through the rear axles, especially in the first couple gears, like over 2500ft-lbs of torque.
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Old 11-02-2009, 03:17 PM   #35
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Quote:
Originally Posted by Mystikal View Post
Well an LSD of any ratio is an upgrade from your open diff. But with the M50 manifold and tune, you'll be having a lot of fun with the shorter gearing.
so a 3.xx LSD from a 4.1 Open, is an upgrade?
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Old 11-02-2009, 04:27 PM   #36
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so a 3.xx LSD from a 4.1 Open, is an upgrade?
Not at all with a 318. Everything I said was about the M52 motor.
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Old 11-02-2009, 06:51 PM   #37
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Well, I just put a 3:23 in over my stock diff this wknd and i've been tricking myself the whole day thinking the car has added power.

I'm surprised no one has mentioned this as i found out for myself. The diff bolts right up but there maybe some adjustments required or parts brought over from your original diff.

If your car has a 4 bolt or six bolt driveshaft, you may need to get the LSD with the matching input flange. If not you'll have to swap the input flanges from the diffs.
Also, you may be required to swap the output flanges from the stock diff to the LSD as well to make the halfshafts bolt up.

Just advising as i never noticed this prior to doing the swap. Either that or i never paid attention to the more detailed DIY's.
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Old 11-04-2009, 11:08 PM   #38
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The main bolt on the front of the diff. If you pull up the diagram on realoem.com you'll see exactly which one it is.
are you talking about #16 on the below pic? thx

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Old 11-05-2009, 10:58 AM   #39
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Yup.

Quote:
16 Hex bolt with washer M12X1,5X80 ZNS3 1 33176760337
It's a special hardened bolt that you will be hard pressed to find anywhere but from BMW. It's 80mm long and takes a bunch of torque, don't skip this step!
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Old 11-05-2009, 01:26 PM   #40
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Yup.



It's a special hardened bolt that you will be hard pressed to find anywhere but from BMW. It's 80mm long and takes a bunch of torque, don't skip this step!
thanks alot
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Old 11-05-2009, 02:36 PM   #41
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^^LMFAO @ the cream for knees campaign. How did i miss that thread?
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Old 11-05-2009, 03:16 PM   #42
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My install appt is tomorrow morning. Getting the gasket, fluid, bushings and bolts replaced. I will update te thread on what differences I feel after the install. Thanks for all of your advice guys.
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Old 11-05-2009, 03:23 PM   #43
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what fluid are you going to use?
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Old 11-05-2009, 03:58 PM   #44
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redline 75w90
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Old 11-06-2009, 10:31 AM   #45
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redline 75w90
i'm going to install 3.91 LSD and was thinking of buying the same stuff.
where did u buy that? thanks
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