BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read




 

Post Reply
 
Thread Tools Search this Thread
      07-04-2020, 12:10 PM   #1
CarJunkie
Lieutenant Colonel
United_States
593
Rep
1,604
Posts

Drives: e82 1M, e30 325e, f15 X5 40e
Join Date: Nov 2011
Location: Tri-Cities, Washington

iTrader: (1)

Garage List
Who has rebuilt/replaced LSD?

I have been toying with upgrading the LSD for a year or so, and alas my right rear output seal is starting to show some wetness. I have an excuse!!

Who has done this? What are your impressions?

MFactory, Diffs Online, Turner as vendor?

Multi clutch vs. Quaife vs. Helical vs. OS Giken?

Anyone change the final drive ratio?

Its pretty much a dedicated track car at this point, running tune with 450-480 ft-lb at the wheels. I'll probably plan to do this during the next offseason so I have some time to research.

Thanks in advance!

__________________
1M track toy mods: BMS chargepipe, BMW OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.
Appreciate 0
      07-04-2020, 12:32 PM   #2
ayao
Thread killer
488
Rep
1,760
Posts

Drives: 1M
Join Date: Aug 2011
Location: CA

iTrader: (2)

If you don't get any bites here, there has been active discussion about this over at M3post -- an example of this is:
https://www.m3post.com/forums/showthread.php?t=1359647

User dogbone in particular has dedicated an inordinate amount of time sweating the details of his build and unlike many, uses it regularly on track and shares the info with the other track rats, backed up with hard data.
https://www.m3post.com/forums/showpo...&postcount=173
Appreciate 1
CarJunkie593.00

      07-04-2020, 01:15 PM   #3
CarJunkie
Lieutenant Colonel
United_States
593
Rep
1,604
Posts

Drives: e82 1M, e30 325e, f15 X5 40e
Join Date: Nov 2011
Location: Tri-Cities, Washington

iTrader: (1)

Garage List
Thanks!
__________________
1M track toy mods: BMS chargepipe, BMW OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.
Appreciate 0
      07-06-2020, 07:56 PM   #4
CarJunkie
Lieutenant Colonel
United_States
593
Rep
1,604
Posts

Drives: e82 1M, e30 325e, f15 X5 40e
Join Date: Nov 2011
Location: Tri-Cities, Washington

iTrader: (1)

Garage List
So after reading extensively from driftflo and dogbone over on e92 post, I am leaning heavily toward a custom OS Giken unit tuned by OS Giken and put into a rebuilt diff by Turner. I will go with a 3.23 gear which is SLIGHTLY taller than stock. I'll have them REM polish the gears and bearings. If I am going to do it, I may as well do it right.
__________________
1M track toy mods: BMS chargepipe, BMW OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.
Appreciate 0
      07-07-2020, 03:53 PM   #5
ayao
Thread killer
488
Rep
1,760
Posts

Drives: 1M
Join Date: Aug 2011
Location: CA

iTrader: (2)

Quote:
Originally Posted by CarJunkie View Post
So after reading extensively from driftflo and dogbone over on e92 post, I am leaning heavily toward a custom OS Giken unit tuned by OS Giken and put into a rebuilt diff by Turner. I will go with a 3.23 gear which is SLIGHTLY taller than stock. I'll have them REM polish the gears and bearings. If I am going to do it, I may as well do it right.
Looking forward to hearing about the progression of this project!
Appreciate 1
CarJunkie593.00

      07-18-2020, 12:32 PM   #6
CarJunkie
Lieutenant Colonel
United_States
593
Rep
1,604
Posts

Drives: e82 1M, e30 325e, f15 X5 40e
Join Date: Nov 2011
Location: Tri-Cities, Washington

iTrader: (1)

Garage List
Interesting update, and new question:

I had a track day yesterday. I wanted to be certain that there was adequate fluid in the rear differential, and I'm approaching 60,000 miles so I went ahead and replaced both the transmission and the rear differential fluid last week. I was surprised that oil came out of the fill plug, meaning at the rear differential was not low on fluid at all. After filling it back up, I cleaned a small section of the axle hub immediately adjacent to the differential output so that I could see how much oil or wetness accumulated during my track day.

This morning, I was surprised to find that the small section I had cleaned remained completely spotless, no oil on it at all. The adjacent CV boot is also in excellent condition and doesn't show any moisture on it.

I see two options. First, maybe the oil that got onto the driver side axle hub where it joins the rear differential output came from something else, not even my car. That doesn't seem possible. The second option is that my previous fluid was old, differential got too hot, and some vapor managed to escape the seal, but with fresh fluid in there, no leakage is occurring. That would suggest that the driver side output seal is nearing the end of it's life, but there is no rush to rebuild. The LSD itself still seems to be functioning as it should. Thoughts?

I may not need to rebuild the diff this season after all, and it wasn't exactly in the budget. I have at least one more track day planned. I have now completely cleaned the entire axle hub and driver side of the differential, and will monitor it after each track day until I see fluid there again.
__________________
1M track toy mods: BMS chargepipe, BMW OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.
Appreciate 0
      09-16-2020, 06:16 PM   #7
UN1CORM
Enlisted Member
United_States
9
Rep
39
Posts

Drives: AW3 1M
Join Date: Feb 2015
Location: Old Town Rd

iTrader: (0)

Quote:
Originally Posted by CarJunkie View Post
Interesting update, and new question:

I had a track day yesterday. I wanted to be certain that there was adequate fluid in the rear differential, and I'm approaching 60,000 miles so I went ahead and replaced both the transmission and the rear differential fluid last week. I was surprised that oil came out of the fill plug, meaning at the rear differential was not low on fluid at all. After filling it back up, I cleaned a small section of the axle hub immediately adjacent to the differential output so that I could see how much oil or wetness accumulated during my track day.

This morning, I was surprised to find that the small section I had cleaned remained completely spotless, no oil on it at all. The adjacent CV boot is also in excellent condition and doesn't show any moisture on it.

I see two options. First, maybe the oil that got onto the driver side axle hub where it joins the rear differential output came from something else, not even my car. That doesn't seem possible. The second option is that my previous fluid was old, differential got too hot, and some vapor managed to escape the seal, but with fresh fluid in there, no leakage is occurring. That would suggest that the driver side output seal is nearing the end of it's life, but there is no rush to rebuild. The LSD itself still seems to be functioning as it should. Thoughts?

I may not need to rebuild the diff this season after all, and it wasn't exactly in the budget. I have at least one more track day planned. I have now completely cleaned the entire axle hub and driver side of the differential, and will monitor it after each track day until I see fluid there again.
Splash from outside, probably when it was last serviced.

I honestly can't say I've heard many stories of needing to rebuild a BMW diff. At most, the friction components might need replacing. Even my old 1987 325is would grab enough to get right through snow when my GF's 325i wouldn't move an inch. The seals were definitely leaking on it, too
Appreciate 0
      10-04-2020, 01:26 PM   #8
HP Autosport
General
United_States
2648
Rep
41,048
Posts

Drives: F80 M3
Join Date: Mar 2007
Location: Santa Barbara, AP, Brembo, GIAC, Koni, Ohlins, Performance Friction, www.hpautosport.com

iTrader: (35)

Wetness is completely normal. Under warranty the dealership will not even make the repair.

There is a vent on the final drive unit and under a certain conditions it is normal for some oil/vapor to exit.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 04:34 AM.




1addicts
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST