318ti.org forum

Go Back   318ti.org forum > Technical, Maintenance and Modifications > Differentials

Notices

Differentials Limit Slip, gear ratio discussions.

.
» Recent Threads
1999 M-Sport For Sale
12-31-2023 05:10 PM
Last post by Coop540iT
03-23-2024 06:39 PM
1 Replies, 106,867 Views
Once again 318ti owner...
03-20-2024 12:39 PM
Last post by two30grain
03-22-2024 02:04 PM
1 Replies, 69,730 Views
What brakes do I...
03-20-2024 03:27 PM
Last post by huirtera
03-20-2024 03:27 PM
0 Replies, 66,998 Views
Reply Share/Bookmark
 
Thread Tools Display Modes
Old 09-20-2013, 11:37 PM   #1
bmorekirby
Senior Member
 
bmorekirby's Avatar
 
Join Date: Nov 2009
Location: Maryland
Posts: 265
Vehicles
iTrader: (0)
Default best diff for an m52 swap

I was wondering what the best diff would be for an 328/m52 swap. I drive about half highway, and half city. Ill be using my getrag trasmission to save some money. I just don't want to be at 4000 rpm's at 80mph.

Which would would be best? i was thinking 2.93 or 3.25.

Thanks in advance,
John

And yes, I searched!
__________________
Quote:
Originally Posted by bubela View Post
I’m happy in my blissful ignorant euphoria! Simple man, simple mind, bigger hammer!
1996 318ti base
1996 Land Rover Range Rover- blew up
1996 Sabb 900 convertable - sold
bmorekirby is offline   Reply With Quote
Old 09-20-2013, 11:54 PM   #2
1996 328ti
Senior Member
 
1996 328ti's Avatar
 
Join Date: Jun 2003
Location: Greenville, SC
Posts: 9,356
Vehicles
iTrader: (1)
Default

I have a 3.54. It revs pretty high on the highway.
I want to say at 80 it revs almost 4K.

Both needles put to 12 o'clock.
__________________
...steven
BMW CCA #146825
1996 BMW 328ti • 2003 MINI Cooper S • 2016 M235i
www.bmwcca.org
1996 328ti is offline   Reply With Quote
Old 09-22-2013, 10:26 PM   #3
macilona
Senior Member
 
Join Date: Aug 2008
Location: San antonio, tx
Posts: 135
Vehicles
iTrader: (0)
Default

there are a few different ratios available if you convert to the e30 medium case differential. the ti small case may have choices, but all I have seen listed are the 3.45 for the manual and something like 4.10 in the automatic. there is a supplier of differentials: diffsonline.com the website will show various ratios that are available. I have a 3.23 medium case, which was the same as the 95 m3-----at 70mph I turn 3000 rpm-----80 is about 3450. your engine swap will give you low end power for the numerically lower diff ratio, but the lower number will slightly affect your initial acceleration from a stop, so you want a balance between highway rpm's and strong acceleration to take advantage of the increased power.
macilona is offline   Reply With Quote
Old 09-24-2013, 04:21 PM   #4
angel318ti
Senior Member
 
angel318ti's Avatar
 
Join Date: Feb 2005
Location: Richmond Hill, GA
Posts: 1,231
iTrader: (1)
Default

I have a 3.45 lsd listed for sale. I did an automatic to manual swap and it worked pretty well for me.
angel318ti is offline   Reply With Quote
Old 09-24-2013, 10:27 PM   #5
bmorekirby
Senior Member
 
bmorekirby's Avatar
 
Join Date: Nov 2009
Location: Maryland
Posts: 265
Vehicles
iTrader: (0)
Default

Ok. So it sounds like 3.25 would give me that happy medium. Thanks for the avice guys. Now I just have to find an m52.....

Thanks,
John
__________________
Quote:
Originally Posted by bubela View Post
I’m happy in my blissful ignorant euphoria! Simple man, simple mind, bigger hammer!
1996 318ti base
1996 Land Rover Range Rover- blew up
1996 Sabb 900 convertable - sold
bmorekirby is offline   Reply With Quote
Old 10-03-2013, 05:20 AM   #6
Lbcnu24
Senior Member
 
Join Date: Aug 2013
Location: Grove City, PA
Posts: 113
Vehicles
iTrader: (0)
Default

I would do more research if I were you... I bet some here at 318ti.org would chatter and be glad at making fun of other people's tuners... and lead them in the wrong direction because it was hilarious! happened before... I don't know anybody here by all means... but some of people's advice is good I will say that... which is why I will support this site...
Lbcnu24 is offline   Reply With Quote
Old 10-03-2013, 04:10 PM   #7
BimmerBum
Senior Member
 
BimmerBum's Avatar
 
Join Date: Feb 2007
Location: Fl
Posts: 1,353
Vehicles
iTrader: (9)
Default

Quote:
Originally Posted by Lbcnu24 View Post
I would do more research if I were you... I bet some here at 318ti.org would chatter and be glad at making fun of other people's tuners... and lead them in the wrong direction because it was hilarious! happened before... I don't know anybody here by all means... but some of people's advice is good I will say that... which is why I will support this site...
Lbcnu: I have never seen anyone on this site give incorrect advice intentionally because it would be funny. Maybe you have been burned on other forums but that is not how we operate over here.

Diff ratio selection is a matter of preference and purpose. Anything between 2:93 and 3:45 should work for most applications. I am using a 3:08 on my swaps. I like a useable 1st gear, being able to get to 60 in 2nd, and the mpg at highway speed.
__________________



SUPPORT 318ti.org! CLICK THE LINK ABOVE!
Hosting a forum like this is not free. 318ti.org is one of the best BMW forums on the web because it is member supported, not vendor supported. The cost to become a Supporter is a nominal $10.00... A YEAR! DO IT! NOW!

www.BimmerBum.com ALL NEW!
318ti Specific Parts For Sale
www.facebook.com/BimmerBum

BMWCCA #132203
95 318ti Club Sport
98 318ti Active S50 Swap

BimmerBum is offline   Reply With Quote
Old 10-04-2013, 05:41 PM   #8
30yrMbr
Senior Member
 
30yrMbr's Avatar
 
Join Date: Feb 2005
Location: Laguna Beach
Posts: 357
Vehicles
iTrader: (3)
Default

Quote:
Originally Posted by BimmerBum View Post
Lbcnu: I have never seen anyone on this site give incorrect advice intentionally because it would be funny. Maybe you have been burned on other forums but that is not how we operate over here.
.

I agree with Bimmerbum's response, we tend to be respectful of other Ti owner's questions and respond in kind. Enjoy the site and don't hesitate to participate. Enjoy the ride!
__________________
1996 ///M 318ti
Alaska Blue, M-Technic, Chip, Stromung catback, 17" BMW Ltw Wheels, B&M SSK, H&R Springs/Bilsteins, StopTech Brake Lines;

http://www.318ti.org/gallery/data/54...27_clipped.jpg
30yrMbr is offline   Reply With Quote
Old 10-04-2013, 06:04 PM   #9
bmorekirby
Senior Member
 
bmorekirby's Avatar
 
Join Date: Nov 2009
Location: Maryland
Posts: 265
Vehicles
iTrader: (0)
Default

Quote:
Originally Posted by Lbcnu24 View Post
I would do more research if I were you... I bet some here at 318ti.org would chatter and be glad at making fun of other people's tuners... and lead them in the wrong direction because it was hilarious! happened before... I don't know anybody here by all means... but some of people's advice is good I will say that... which is why I will support this site...
Not really brother (assuming). Everyone on this site has been more than helpful, responsive and friendly. Its a lot more laid back than bimmerforums, but just as informative and specific to ti's(obviously). Its why i still frequent this site. This is the only forum i have ever belonged to where i have never been "flamed" or anything of the sort for a simple questions.


John. Now, lets squash that. Somehow we got off topic.

Now, if anyone has any specifics. I want to cruise at 80 in 5th, and want to be at 3000-3200 rpms.
__________________
Quote:
Originally Posted by bubela View Post
I’m happy in my blissful ignorant euphoria! Simple man, simple mind, bigger hammer!
1996 318ti base
1996 Land Rover Range Rover- blew up
1996 Sabb 900 convertable - sold
bmorekirby is offline   Reply With Quote
Old 10-04-2013, 07:34 PM   #10
BimmerBum
Senior Member
 
BimmerBum's Avatar
 
Join Date: Feb 2007
Location: Fl
Posts: 1,353
Vehicles
iTrader: (9)
Default

Quote:
Originally Posted by bmorekirby View Post

Now, if anyone has any specifics. I want to cruise at 80 in 5th, and want to be at 3000-3200 rpms.
3:08 will put you around 3300-3400 at 80. If your only concern is highway cruising rpm (which I am guessing it is not as you have a swapped ti) then you will want to go with a 2:93 to achieve the 3000-3200 goal you are after.
__________________



SUPPORT 318ti.org! CLICK THE LINK ABOVE!
Hosting a forum like this is not free. 318ti.org is one of the best BMW forums on the web because it is member supported, not vendor supported. The cost to become a Supporter is a nominal $10.00... A YEAR! DO IT! NOW!

www.BimmerBum.com ALL NEW!
318ti Specific Parts For Sale
www.facebook.com/BimmerBum

BMWCCA #132203
95 318ti Club Sport
98 318ti Active S50 Swap

BimmerBum is offline   Reply With Quote
Old 10-05-2013, 06:27 AM   #11
Lbcnu24
Senior Member
 
Join Date: Aug 2013
Location: Grove City, PA
Posts: 113
Vehicles
iTrader: (0)
Default

Ok guys, it's all good.

And thank you guys for pointing out the kind attributes many have exemplified on here. And I agree... Other forums are not like this one... Which is nice to see and experience... The useful knowledge that many have posted is good to look at, based on others experience... I would hate to see someone not investigate what their criteria demands in relation to mpg, rpm, torque, etc... and take someone's word for it and not get what they needed... I spoke too soon...

and some vagabonds at other forums have simply put people through it... unnecessary roughness... Which hasn't happened here... phew!

That's sweet Bmorekirby...

Good Points BimmerBum... (i bought some oil filters from you) good follow through by the way...too!

~Squashed~ "happily"
Lbcnu24 is offline   Reply With Quote
Old 10-07-2013, 04:17 PM   #12
BimmerBum
Senior Member
 
BimmerBum's Avatar
 
Join Date: Feb 2007
Location: Fl
Posts: 1,353
Vehicles
iTrader: (9)
Default

Quote:
Originally Posted by Lbcnu24 View Post

Good Points BimmerBum... (i bought some oil filters from you) good follow through by the way...too!
Thank you!
__________________



SUPPORT 318ti.org! CLICK THE LINK ABOVE!
Hosting a forum like this is not free. 318ti.org is one of the best BMW forums on the web because it is member supported, not vendor supported. The cost to become a Supporter is a nominal $10.00... A YEAR! DO IT! NOW!

www.BimmerBum.com ALL NEW!
318ti Specific Parts For Sale
www.facebook.com/BimmerBum

BMWCCA #132203
95 318ti Club Sport
98 318ti Active S50 Swap

BimmerBum is offline   Reply With Quote
Old 10-09-2013, 05:01 PM   #13
raamaudio
Senior Member
 
Join Date: May 2013
Location: Morgan Utah
Posts: 214
iTrader: (0)
Default

I decided on 3.25 for my S52 swap and taller tires for the street and shorter for the track. I was able to get a Euro LSD which is much stronger, 4 disk, custom setup for me at a reasonable cost. I stayed with the smaller case to save weight so adding a dual ear cover and making a custom mount for the chassis for it.

I had to go 3.25 to get that LSD but it worked out as a good overall ratio for street and track with shorter track wheels and tires.

If cannot get the exact ratio you want you can do use taller or shorter tires to dial it in, to a degree at least.
raamaudio is offline   Reply With Quote
Old 10-10-2013, 04:28 PM   #14
raamaudio
Senior Member
 
Join Date: May 2013
Location: Morgan Utah
Posts: 214
iTrader: (0)
Default

If not for the Euro LSD I would of done a medium case diff swap, probably a good idea with any larger engine swap to do so.
raamaudio is offline   Reply With Quote
Old 11-06-2013, 11:31 AM   #15
adamb
Senior Member
 
Join Date: Feb 2012
Location: Dallas, Tx
Posts: 110
iTrader: (0)
Default

I'm getting ready to do my manual swap but before I start anything I need to get another diff. I have pretty much the same question and reading the posts gave me a better understanding.

I would like to find a diff I can swap in without having to do any conversion or modifications. Would a Z3M 3.25 one ear diff fit in the ti?

Im not going to be tracking the car or anything but i do plan on an engine swap sometime around feb. Looking at the M52 as well. I do a good bit of both highway and city driving so i want something that will be a happy medium as stated previously and it sounds like a 3.25 LSD will be my best bet. Am i correct?

My other question is can you fine gents (and possibly lasses) point me in some direction as to where i can get some ti specific info for the auto to manual swap..?
adamb is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Misc parts M44 engine, auto trans, diff, driveline, radiator, 124k miles, swap time:) raamaudio Parting out & Parts (US) 4 01-08-2014 12:04 AM
Rear Wheel Bearings after Diff Swap jimmypet Differentials 0 07-22-2013 10:25 PM
E30 Diff and Axle swap questions pred Differentials 2 08-14-2012 08:54 PM
E30 Diff swap advice pnosker Differentials 18 07-08-2010 10:56 PM
Diff. swap question? FATHER Differentials 28 07-26-2006 08:48 PM


All times are GMT +1. The time now is 04:22 PM.


.
Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2024, 318ti.org
© vBadvanced CMPS v3.2.2
[page compression: 138.11 k/162.68 k (15.11%)]

318ti.org does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information or products discussed.