Modifying E38 Open diff to LSD idea - BMW Forum - BimmerWerkz.com
1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 06-09-2010, 09:43 AM
42, The meaning of life
 
brettski's Avatar
 
Join Date: Jul 2009
Location: Melbourne, Australia
Posts: 2,405
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
brettski is just really nice brettski is just really nice brettski is just really nice brettski is just really nice brettski is just really nice
(Thread Starter)
Modifying E38 Open diff to LSD idea

It has been suggested that one way of converting an E38 open diff to a LSD diff, could be to use the limited slip center spool from an E32 seven series. Now there are are several questions that occur to me that may be of concern:
a) Does the LSD spool need to match up with the gearing ratio of the open diff?
b) How does the spool mount and integrate within the existing diff housing?
c) Where there any issues with the E32 LSD diffs that would make this a really bad idea?
brettski is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 07-25-2010, 06:11 AM
42, The meaning of life
 
brettski's Avatar
 
Join Date: Jul 2009
Location: Melbourne, Australia
Posts: 2,405
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
brettski is just really nice brettski is just really nice brettski is just really nice brettski is just really nice brettski is just really nice
(Thread Starter)
Does anyone have an exploded diagram or dismantle / reassembly instructions for the E38 diff?


Riding in style
brettski is offline  
#3 (permalink) Old 07-25-2010, 09:24 PM
Mr. Clean
 
BimmerE39's Avatar
 
Join Date: Jan 2009
Location: Danbury, Connecticut
Posts: 1,817
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
BimmerE39 will become famous soon enough
Garage
Quote:
Originally Posted by brettski View Post
It has been suggested that one way of converting an E38 open diff to a LSD diff, could be to use the limited slip center spool from an E32 seven series. Now there are are several questions that occur to me that may be of concern:
a) Does the LSD spool need to match up with the gearing ratio of the open diff?
b) How does the spool mount and integrate within the existing diff housing?
c) Where there any issues with the E32 LSD diffs that would make this a really bad idea?
a) The gear ratios should be the same to maintain identical performance. A higher ratio will make the car quicker off the line with a higher top gear cruising engine speed

b) From what I could tell by looking at realoem it seems that the differentials are very different and so are the casings. I would also be concerned with the output shafts being different and the driveshaft inputs being different as well. I'm not sure if this would bee possible without extensive modification to the rear end. I also believe the E32 had a "big diff housing" as well as a "small diff housing". I think thee 735i's and 730i's had the small diff and the 740i's and 750i's had the bigger diff. It might be possible that the "big diff" will fit in your 740i...

c) I doubt it as long as they were properly maintained.
BimmerE39 is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 1,6,7,8 - Series and Mini Cooper


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
E38 740i Diff Ratio? bobwatt 1,6,7,8 - Series and Mini Cooper 2 09-16-2008 09:23 PM
modifying e36 sam90 3-Series (E36) 10 04-28-2006 08:46 AM
Parting: 1993 325is Blk/blk Lsd Diff cutter0 OEM Parts 20 08-25-2005 08:51 PM
Need Diff Oil For 318 With Non-lsd fushuman 3-Series (E36) 6 01-28-2005 02:41 PM
LIMITED SLIP DIFF (LSD) 88convguy Classifieds Sell & Buy 0 01-15-2004 12:33 PM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome