New Dinan 3.91 Rear Diff ? - BMW M5 Forum and M6 Forums
E60 M5 and E61 M5 Touring Discussion 2005- Advertiser's Forum

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 33 Old 24th February 2007, 09:56 PM Thread Starter
JDS M5
Addicted Member (>300 posts)
 
JDS M5's Avatar
 
Join Date: Feb 2001
Location: Mukwonago, Wisconsin
Age: 51
Posts: 331
Thanks: 6
Thanked 6 Times in 5 Posts
New Dinan 3.91 Rear Diff ?

Recently, I had the Dinan exhaust and the 3.91 Rear Diff. installed. I love the sound of the exhaust, and I'll have to wait to comment on the Diff. until the breakin is complete and Diff. oil changed. Maybe it is my imagination, but I do hear a slight whine at speed after you take your foot of the gas. Is this normal, and will it go away? Has any one else experienced this slight noise, is it a matter of waiting for breakin to be completed. Any thoughts, Please.


Regards,

JDS M5
JDS M5 is offline  
Sponsored Links
Advertisement
 
post #2 of 33 Old 24th February 2007, 10:00 PM
bonehead
M5 Expert (>4000)
 
bonehead's Avatar
 
Join Date: May 2006
Location: CA
Posts: 5,818
Thanks: 22
Thanked 197 Times in 135 Posts
Search it my friend. A well known and unfortunate problem that will not go away with break-in.

Boner

bonehead is offline  
post #3 of 33 Old 25th February 2007, 02:10 AM
parkcitytom
Addicted Member (>300 posts)
 
parkcitytom's Avatar
 
Join Date: Jan 2007
Location: Park City, UT
Posts: 339
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by JDS M5
Recently, I had the Dinan exhaust and the 3.91 Rear Diff. installed. I love the sound of the exhaust, and I'll have to wait to comment on the Diff. until the breakin is complete and Diff. oil changed. Maybe it is my imagination, but I do hear a slight whine at speed after you take your foot of the gas. Is this normal, and will it go away? Has any one else experienced this slight noise, is it a matter of waiting for breakin to be completed. Any thoughts, Please.


Regards,

JDS M5
I have the same 3.91 diff...yes it has a distinct "whirring" noise only when my foot is off the gas. I am also in the middle of the break in period. A few threads here suggest that the oil change will fix the problem.....but I'm not holding my breath...


Tom

Tom


Park City Utah, @7,225 Feet In The Rockies

2006 E60 M5
Pictures and Videos at: M5s.us

Silver Gray Metallic - Silverstone Ext Leather - Aluminum
Charcoal Filters: Out - Tint: Ceramic 50% / 20% - Bra
iBrights 2.0 (White) - V1 Hard-Wired
Dinan: Exhaust - Stage 2 Suspension - CF Front & Rear Braces - Wheels - 3.91 Limited Slip
Dinan: Pedal Cover Set - Throttle Bodies (Paid For, Awaiting Installation)
EvoSport: Headers - Power Pulley Kit - Stage 2 ECU Upgrade (Waiting To Order)


parkcitytom is offline  
post #4 of 33 Old 25th February 2007, 06:54 PM
LI-M5
M5 Guru (>2000 posts)
 
LI-M5's Avatar
 
Join Date: May 2006
Location: LONG ISLAND NY
Age: 39
Posts: 3,247
Thanks: 78
Thanked 95 Times in 72 Posts
i got the diff for a while now and i got the whine , just waiting for dinan to replace it now !! when did you get it installed ask the dealer if they had it in stock for a while cause dinan supposedly fixed the problem.

2013 F10 M5
Apline White/Black/Black
LI-M5 is offline  
post #5 of 33 Old 25th February 2007, 08:52 PM
parkcitytom
Addicted Member (>300 posts)
 
parkcitytom's Avatar
 
Join Date: Jan 2007
Location: Park City, UT
Posts: 339
Thanks: 0
Thanked 0 Times in 0 Posts
Dinan was out of cores, so I had to send mine in and to have them build it...perhaps three weeks ago...the whirring is there....the only hope is the oil change, but thats really iffy IMO.


Tom

Tom


Park City Utah, @7,225 Feet In The Rockies

2006 E60 M5
Pictures and Videos at: M5s.us

Silver Gray Metallic - Silverstone Ext Leather - Aluminum
Charcoal Filters: Out - Tint: Ceramic 50% / 20% - Bra
iBrights 2.0 (White) - V1 Hard-Wired
Dinan: Exhaust - Stage 2 Suspension - CF Front & Rear Braces - Wheels - 3.91 Limited Slip
Dinan: Pedal Cover Set - Throttle Bodies (Paid For, Awaiting Installation)
EvoSport: Headers - Power Pulley Kit - Stage 2 ECU Upgrade (Waiting To Order)


parkcitytom is offline  
post #6 of 33 Old 25th February 2007, 09:17 PM
andrewsherman
M5 Expert (>4000)
 
andrewsherman's Avatar
 
Join Date: Jul 2006
Location: New York
Posts: 4,405
Thanks: 143
Thanked 559 Times in 344 Posts
I thought this was fixed. I have one on order, but now I may hold off.

2014 M5 Competition|Space Grey|Black Merino Full Leather|Anthracite Trim|Executive package|LED Lighting Package|Drivers's Assit Package|B&O Sound System|Bel STiR Plus 9500ci|IND Side Markers and Side Vents|Exhaustmeister|Pirelli Sottozero Serie II

Past Rides:'07 M5 Silver grey/Black(Nicely Modded)|'04 745Li Titanium Grey/Black|'01 740iL Titanim Silver/Black|'91 K1100RS|'88 K75S
andrewsherman is offline  
post #7 of 33 Old 25th February 2007, 09:18 PM
kinkade
Junior Member, warming up (<31 posts)
 
Join Date: Nov 2006
Location: alamo
Posts: 27
Thanks: 0
Thanked 0 Times in 0 Posts
I am somewhat concerned, i have on order a new diff from Dinan and was assured that the new units don't "whine". This problem i'm told started after Dinan ordered gears from BMW. Are the problems that have arisen on new units? Hopefully someone from Dinan will read these posts!!!
kinkade is offline  
post #8 of 33 Old 25th February 2007, 09:25 PM
parkcitytom
Addicted Member (>300 posts)
 
parkcitytom's Avatar
 
Join Date: Jan 2007
Location: Park City, UT
Posts: 339
Thanks: 0
Thanked 0 Times in 0 Posts
If you do a search on this, you will find that its about an even split between those that lost the whirring when they changed out the diff oil @1,200 miles.....and then those that have had and still have the whirring.

It is slight and cannot be heard with the radio on at almost any level.....but when "silent running" you can certainly hear it....always and only under acceleration, at any level.



Tom

Tom


Park City Utah, @7,225 Feet In The Rockies

2006 E60 M5
Pictures and Videos at: M5s.us

Silver Gray Metallic - Silverstone Ext Leather - Aluminum
Charcoal Filters: Out - Tint: Ceramic 50% / 20% - Bra
iBrights 2.0 (White) - V1 Hard-Wired
Dinan: Exhaust - Stage 2 Suspension - CF Front & Rear Braces - Wheels - 3.91 Limited Slip
Dinan: Pedal Cover Set - Throttle Bodies (Paid For, Awaiting Installation)
EvoSport: Headers - Power Pulley Kit - Stage 2 ECU Upgrade (Waiting To Order)


parkcitytom is offline  
post #9 of 33 Old 25th February 2007, 10:05 PM Thread Starter
JDS M5
Addicted Member (>300 posts)
 
JDS M5's Avatar
 
Join Date: Feb 2001
Location: Mukwonago, Wisconsin
Age: 51
Posts: 331
Thanks: 6
Thanked 6 Times in 5 Posts
Diff Diff Diff

My 3.91 Diff was installed last Friday, Feb. 23rd. The guy from Fall-Line took it for a ride and said everything was OK. On my way home, I would lift off the throttle and hear this slight whining sound. It was repeatable every time. I.E. traveling at 70 MPH, I removed my foot from the throttle, and for the first 10 sec. I would hear the noise and it would then fade, I would accelerate again, and then lift off, and again I would hear the noise, which would then fade away. Is this what happened to everyone else, or was your noise different. Does anyone have a number or contact to call at Dinan. You should not have this problem for $3000. How can you tell if the serial number of the unit installed has an issue with the gear set??

Regards,

JDS M5


Quote:
Originally Posted by LI-M5
i got the diff for a while now and i got the whine , just waiting for dinan to replace it now !! when did you get it installed ask the dealer if they had it in stock for a while cause dinan supposedly fixed the problem.
JDS M5 is offline  
post #10 of 33 Old 25th February 2007, 10:15 PM
Gustav
Administrator
 
Gustav's Avatar
 
Join Date: Mar 2000
Location: Kingdom of Sweden
Age: 39
Posts: 49,483
Blog Entries: 7
Thanks: 5,951
Thanked 3,785 Times in 2,285 Posts
Did you read this:

Important update.

I have just got an mail from Steve Dinan himself, after I e-mailed them in general. Dinan is a Sponsor of m5board.com and m6board.com.

I quote below:


"We ran out for a short period of time so we purchase 14 gears from BMW Motorsport. These are the ones that made noise. We now have our gears on the shelf and would be happy to warrant the differential for anyone who is having a noise issue. The BMW gears are good quality they are just louder than ours. Our gears are lapped so they are quite. This basically means we run the gears against each other with lapping compound. This polishes the gears and reduces friction and noise. "

End of quote.


So for you people who have issues: contact Dinan, send them regards from Gustav and m5board.com and refeer to this thread if anything is unsure. That is if you want Dinan differentials instead if BMW M GmBh ones

I hope this helps!

/ Gustav
______________
Gustav is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW M5 Forum and M6 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
Tech: Dinan suspension install (long) M5Joe M5 E39 and E60 tips & tricks 2 14th October 2013 12:37 AM
Rear diff is in... DINAN 3.91 LI-M5 E60 M5 and E61 M5 Touring Discussion 121 9th November 2011 04:55 AM
BMW M6 Convertible Press Release 1: Design, Body, Features. (in English and German) Gustav E63 BMW M6 Forum and BMW M6 Convertible | m6board.com 2 22nd June 2006 10:34 PM
ATTN: For the two guys who recently contacted me, re: rear diff. group buy........... FAST 5 E39 M5 and E52 Z8 Discussion 6 10th April 2004 10:40 PM
DINAN 3.45 rear diff. GROUP BUY is a Go! Info & Details............... FAST 5 M5 E39 Group Buy Forum and Sponsor Discussion and Offerings 20 11th November 2003 10:12 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

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