E90Post
 


GT Haus
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > 335d Guys, Anyone ever swap LSD gear ratios?



Reply
 
Thread Tools Search this Thread
      03-08-2012, 10:45 PM   #1
Rotorocious
Major
 
Rotorocious's Avatar
 
Drives: 335i
Join Date: May 2010
Location: Florida

Posts: 1,456
iTrader: (3)

335d Guys, Anyone ever swap LSD gear ratios?

I have a buddy with a 335d I'm trying to help.

So I read the 335d has a 2.81 gear ratio.
Has anyone ever swapped it out when upgrading to an LSD to a 3.08 or 3.46?
Just curious how that may effect rpms and driveability etc on a diesel.
Rotorocious is offline  
0
Reply With Quote
      03-09-2012, 08:53 AM   #2
minus13
Private
 
Drives: 2009 335D
Join Date: Feb 2012
Location: South Carolina

Posts: 92
iTrader: (1)

Considered it - not touching it. There's already significant torque down low to be sacrificing top end speed and cruising ratio. These cars launch in second gear for crying out loud. If you want a tighter ratio, put her into first gear (I know I am oversimplifying, but you get my point).

My humble opinion - not necessary.
minus13 is offline  
0
Reply With Quote
      03-09-2012, 09:59 AM   #3
mosx
The mod bug has bitten.
 
Drives: 2008 M3 Sedan
Join Date: Jun 2010
Location: North Texas

Posts: 565
iTrader: (1)

Garage List
2008 BMW M3  [0.00]
I don't own a diesel but I'm guessing if you put a 3.08 or a 3.46 in there you'd just spin the tires on every launch. Gobs o' torque.
mosx is offline   United_States
0
Reply With Quote
      03-09-2012, 03:09 PM   #4
Thud
Throbbing Member
 
Drives:
Join Date: Jan 2008

Posts: 1,431
iTrader: (0)

1st gear is already useless as it is, what good would a shorter rear end ratio do?
__________________
2011 335d / Deep Sea Blue / Saddle brown / sport / premium

Previous cars:
2008 BMW 135i / 6MT
2002 Z06 Corvette
Thud is offline  
0
Reply With Quote
      03-09-2012, 03:13 PM   #5
Concentric190
Second Lieutenant
 
Drives: 335d
Join Date: Mar 2011
Location: Willowbrook, IL

Posts: 262
iTrader: (0)

Garage List
1997 BMW M3  [0.00]
2009 BMW 335d  [0.00]
1995 BMW M3  [0.00]
if anything I'd want a taller gear so I could make use of 1st gear and have a lower rpm cruising on the highway. 2.50 LSD would be nice. It would probably be faster and get better MPG's.
__________________
///Andres
09 335d evolve tuned - 327whp / 490wtq -- 13.0@105
95 M3 Turbo - Built 3.0l s52, PTE74GTQ, AEM EMS & CDI
97 M3 NASA TTB build for 2014!
Concentric190 is offline   United_States
0
Reply With Quote
      03-09-2012, 04:40 PM   #6
minus13
Private
 
Drives: 2009 335D
Join Date: Feb 2012
Location: South Carolina

Posts: 92
iTrader: (1)

Quote:
Originally Posted by Concentric190 View Post
if anything I'd want a taller gear so I could make use of 1st gear and have a lower rpm cruising on the highway. 2.50 LSD would be nice. It would probably be faster and get better MPG's.
I like the way you think. I wonder how this would affect shift points when in drive and DS? I shift my own gears with the 335d, but I'm curious nonetheless. I still have some time to make this change. VAC is building me a final drive unit right now. You think 2.50 would be the way to go?
minus13 is offline  
0
Reply With Quote
      03-09-2012, 04:51 PM   #7
minus13
Private
 
Drives: 2009 335D
Join Date: Feb 2012
Location: South Carolina

Posts: 92
iTrader: (1)

Looking into it. VAC is building me a final drive unit. I'll let you guys know.
minus13 is offline  
0
Reply With Quote
      03-09-2012, 06:54 PM   #8
minus13
Private
 
Drives: 2009 335D
Join Date: Feb 2012
Location: South Carolina

Posts: 92
iTrader: (1)

Looking into 2.53:1 ratio... Still curious as to how this will affect shift points when in drive or DS. I guess we'll see. In drive, second gear launch may be a dog.
minus13 is offline  
0
Reply With Quote
      03-09-2012, 08:33 PM   #9
Rotorocious
Major
 
Rotorocious's Avatar
 
Drives: 335i
Join Date: May 2010
Location: Florida

Posts: 1,456
iTrader: (3)

Interesting points guys.
Thanks for the input
Rotorocious is offline  
0
Reply With Quote
      03-12-2012, 01:25 PM   #10
Concentric190
Second Lieutenant
 
Drives: 335d
Join Date: Mar 2011
Location: Willowbrook, IL

Posts: 262
iTrader: (0)

Garage List
1997 BMW M3  [0.00]
2009 BMW 335d  [0.00]
1995 BMW M3  [0.00]
Quote:
Originally Posted by minus13 View Post
Looking into 2.53:1 ratio... Still curious as to how this will affect shift points when in drive or DS. I guess we'll see. In drive, second gear launch may be a dog.
there are some calculators out there that will tell you what your rpms will be at different speeds in different gears. I had it on my home computer but its been a while since I used it.

That would be the best to determine what gear you want.
__________________
///Andres
09 335d evolve tuned - 327whp / 490wtq -- 13.0@105
95 M3 Turbo - Built 3.0l s52, PTE74GTQ, AEM EMS & CDI
97 M3 NASA TTB build for 2014!
Concentric190 is offline   United_States
0
Reply With Quote
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
Forum Jump


All times are GMT -5. The time now is 07:47 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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