THE LARGEST BMW 2-SERIES FORUM ON THE PLANET
2Addicts
2Addicts
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning M Performance LSD Cross Compatibility w/ F/30?

Post Reply
 
Thread Tools Search this Thread
      05-11-2019, 11:57 AM   #1
ghost.M
Private
United_States
15
Rep
59
Posts

Drives: 2015 BSM M235i 6MT
Join Date: Sep 2018
Location: LA

iTrader: (0)

M Performance LSD Cross Compatibility w/ F/30?

Does anyone know if the F30/F32 MP LSD will fit our cars? They are on crazy deep sale right now and I'd love to get one if they will fit. Also, are there major differences between 6MT and ZF8 other than gear ratio? If the housing, input shaft, and output shafts are all the same this should theoretically work with the M235i/M240i.

$560
https://www.bimmerworld.com/Drivelin...107555607.html

$650
https://www.ecstuning.com/b-genuine-...l/33107555607/

$580 ($1000 installed)
https://www.shopbmwusa.com/PRODUCT/4...P-DIFFERENTIAL

$650
https://www.turnermotorsport.com/p-1...335i-f32-435i/
Appreciate 0
      05-11-2019, 12:58 PM   #2
Pray for Mojo
Captain
Canada
323
Rep
912
Posts

Drives: 2014 M235i & 2018 X3 M40i
Join Date: Apr 2014
Location: Calgary

iTrader: (0)

For whatever reason they have different part numbers vs the M235i version. Hard to believe how cheap they are, I bought mine last summer for $2,200.
Appreciate 0
      05-11-2019, 01:07 PM   #3
ghost.M
Private
United_States
15
Rep
59
Posts

Drives: 2015 BSM M235i 6MT
Join Date: Sep 2018
Location: LA

iTrader: (0)

Quote:
Originally Posted by Pray for Mojo View Post
For whatever reason they have different part numbers vs the M235i version. Hard to believe how cheap they are, I bought mine last summer for $2,200.
Congrats on yours - how do you like it? I expect they will fit, just want someone to confirm before I pull the trigger!
Appreciate 0
      05-11-2019, 01:48 PM   #4
Pray for Mojo
Captain
Canada
323
Rep
912
Posts

Drives: 2014 M235i & 2018 X3 M40i
Join Date: Apr 2014
Location: Calgary

iTrader: (0)

Other than flash tuning its the best mod I've done on the car. It changes the entire feel of the car, if you are over stock hp it's necessary to put the power down.
Appreciate 1
Dylan861218.00

      05-11-2019, 02:29 PM   #5
ghost.M
Private
United_States
15
Rep
59
Posts

Drives: 2015 BSM M235i 6MT
Join Date: Sep 2018
Location: LA

iTrader: (0)

Quote:
Originally Posted by Pray for Mojo View Post
Other than flash tuning its the best mod I've done on the car. It changes the entire feel of the car, if you are over stock hp it's necessary to put the power down.
Good to know! I will hold out a little longer as it would be nice to avoid the headache if someone else has tried before. I found discussion on swapping LSDs from E90s and that doesn't work since the housings and shafts are different but still nothing on swapping F30/F22. Thanks for the input!
Appreciate 0
      05-11-2019, 06:04 PM   #6
Poochie
Luxury at the redline :)
Poochie's Avatar
United_States
4949
Rep
5,307
Posts

Drives: 2016 M2
Join Date: Aug 2012
Location: NYC

iTrader: (1)

It won't work, the LSDs are vehicle specific..

https://www.bimmerpost.com/forums/sh...php?p=24745601

https://www.bimmerpost.com/forums/sh...php?p=24374008
Appreciate 0
      05-13-2019, 03:09 PM   #7
Dylan86
Colonel
Dylan86's Avatar
Canada
1218
Rep
2,166
Posts

Drives: Hard
Join Date: Jan 2016
Location: GTA

iTrader: (0)

Just a thought,

The differential, case/outputs aside, is most likely the "universal" component between the model range changes/options. I can see the need for different diameter cases, input/output diameters etc. but a need for an entirely different sized/spec'd LSD unit? That's next level stupidity from a production perspective..

Has anyone thought of this idea?:

- Buy the unit, regardless of the case dimensions and part #
- Have it opened up, remove the LSD and have the final drive gear removed (may req. machine shop)
- Remove factory open diff from said vehicle, open it up, tear down the same as above.
- Re-install new LSD w/ factory final drive pressed on, bearings, input/output cups etc all re-used

- #DRIFTLIFE?
__________________

Last edited by Dylan86; 05-14-2019 at 11:32 AM..
Appreciate 0
      05-13-2019, 03:16 PM   #8
Bassking511
New Member
8
Rep
10
Posts

Drives: 2016 M235i
Join Date: Jan 2019
Location: Fl

iTrader: (0)

I had ordered one when they first went on sale but have since cancelled the order. Looking into it I found the rear axle P/N's are the same but the case sizes are different. Subframes seem to be the same so mounting it would be okay but I couldn't figure out the length of the housing which would effect where the input flange would be.
__________________
'16 M235i Glaciersilber | VMR V710 Gunmetal 9.5x18 (F) 8.5x18 (R)| Michelin PS4S 225/40/18 (F) 255/35/18 (R) | VRSF CP/DP| VRSF Race IC
Injen CAI | BM3 Stage 2 93 | Remus Axleback
Appreciate 0
      05-14-2019, 08:47 AM   #9
arhoads335i
Captain
154
Rep
706
Posts

Drives: 2015 435i grand coupe xdrive
Join Date: Jan 2017
Location: Philadelphia, PA

iTrader: (2)

Garage List
2008 BMW 128I  [0.00]
Wow someone figure this out quick!
Maybe this is happening because the new M340i comes with it stock
__________________
2015 435i grand coupe xdrvie (current)
2006 F250 powerstoke CCSB (current)
2014 M235i Black on Red (SOLD) / 08 e90 335i MT Pure Stage 2 High flow (SOLD)
08 128i 6MT (SOLD) / 08 335i 6MT Pure stage 1 (SOLD)

Last edited by arhoads335i; 05-14-2019 at 08:53 AM..
Appreciate 0
      05-17-2019, 09:22 AM   #10
Sail Boat
Private First Class
98
Rep
141
Posts

Drives: M235i
Join Date: Aug 2017
Location: DC

iTrader: (0)

I COULD BE WRONG! Here are my thoughts:

The M240i and M235i share the same rear subframe/axle carrier for both automatic and manual cars. P/N 33316792505

The F30 335i and F30 LCI 340i share the same subframe/axle carrier for both automatic and manual cars. P/N 33315792506

They also share the same output shafts (axles) Left 33207597685, Right 33207597686

Topping it off, the M240i and 340i share the same LSD part number.

Considering the above, specifically that the 335i/340i rear subframes are the same and the 340i/M240i LSD's are the same part number? why wouldn't the 335i differential fit on the M235i/M240i/340i?

Regarding final drive, there are a couple people on this forum that have played with different rear end ratios from diffsonline without issue.
Appreciate 2
cxp213297.50
ghost.M14.50

      05-17-2019, 10:07 AM   #11
Dylan86
Colonel
Dylan86's Avatar
Canada
1218
Rep
2,166
Posts

Drives: Hard
Join Date: Jan 2016
Location: GTA

iTrader: (0)

^^^ Why I wouldn't be scared to grab the unit, rip out the LSD itself, and install it into the F22 case, with factory final drive. Any trans/diff builder can do this..

I'm tempted to buy one and swap it then resell! lol
__________________
Appreciate 0
      05-17-2019, 10:41 AM   #12
Sail Boat
Private First Class
98
Rep
141
Posts

Drives: M235i
Join Date: Aug 2017
Location: DC

iTrader: (0)

But if this is just a direct swap with what I assume are, at most, different length bolts or something, this is like a $500 job at any reputable private shop.

Whats the procedure here? Drop the subframe a bit, disconnect the input and output shafts, unbolt, then stick the 335i diff back in?

I suppose a shop would have to do this even to swap the internals+check lashing and spacing.
Appreciate 1
Dylan861218.00

      05-17-2019, 12:20 PM   #13
XutvJet
Brigadier General
2908
Rep
3,680
Posts

Drives: 2016 M235 6MT
Join Date: Mar 2016
Location: Kansas City

iTrader: (-1)

Quote:
Originally Posted by Sail Boat View Post
But if this is just a direct swap with what I assume are, at most, different length bolts or something, this is like a $500 job at any reputable private shop.

Whats the procedure here? Drop the subframe a bit, disconnect the input and output shafts, unbolt, then stick the 335i diff back in?

I suppose a shop would have to do this even to swap the internals+check lashing and spacing.
It's simple but some specialty tools are recommended, but not necessarily required.

1) Disconnect the driveshaft nut which is something like a 50mm and have a VERY specific torque tightening sequence.

2) Carefully pry the half shafts out of the differential. BMW has a tool to do this so you don't damage the outside seal, but many have simply pried with standard pry bars and such.

3) Unbolt the diff from the subframe and remove.
__________________
The forest was shrinking, but the Trees kept voting for the Axe, for the Axe was clever and convinced the Trees that because his handle was made of wood, he was one of them.
Appreciate 3
Dylan861218.00
cxp213297.50
ghost.M14.50

      05-17-2019, 03:19 PM   #14
Sail Boat
Private First Class
98
Rep
141
Posts

Drives: M235i
Join Date: Aug 2017
Location: DC

iTrader: (0)

Quote:
Originally Posted by Bassking511 View Post
I had ordered one when they first went on sale but have since cancelled the order. Looking into it I found the rear axle P/N's are the same but the case sizes are different. Subframes seem to be the same so mounting it would be okay but I couldn't figure out the length of the housing which would effect where the input flange would be.
Just did some investigating - looks like the Auto 335i driveshaft is 5mm shorter than the 340i - not much at all from my experience. Also, all the models discussed here, 335i, 340i, M235i and M240i use the same ďinsert nutĒ which I believe joins the driveshaft to the differential input.

For what itís worth, the M235i driveshaft (auto) is 15mm shorter than the m240, which is just under .6 inches. I donít think thatís a major concern either.
Appreciate 0
      05-17-2019, 05:04 PM   #15
ghost.M
Private
United_States
15
Rep
59
Posts

Drives: 2015 BSM M235i 6MT
Join Date: Sep 2018
Location: LA

iTrader: (0)

I have F80 lowering springs and F30 sways bars on my M235i so it seems I will be the guinea pig for another cross platform modification haha. I went ahead and ordered it earlier this week from another seller and it was about $620 shipped. Can't beat that price, and should be easy to resell if necessary. It won't arrive until July as they are backordered from Germany so it will be some time before I can have it installed on the car. Excited to see how this works and love to see the discussion that has developed!
Appreciate 2
Dylan861218.00

      05-17-2019, 07:08 PM   #16
Luftwaffe1O1
Lieutenant
224
Rep
541
Posts

Drives: M235i, 2000 Z3
Join Date: Mar 2015
Location: San Diego, CA

iTrader: (0)

Quote:
Originally Posted by ghost.M View Post
I have F80 lowering springs and F30 sways bars on my M235i so it seems I will be the guinea pig for another cross platform modification haha. I went ahead and ordered it earlier this week from another seller and it was about $620 shipped. Can't beat that price, and should be easy to resell if necessary. It won't arrive until July as they are backordered from Germany so it will be some time before I can have it installed on the car. Excited to see how this works and love to see the discussion that has developed!
Omg please keep us posted, if this is true, I will order it also, this is like the deal of the century haha.

edit: one thing I have noticed immediately is that the ratios are different for F30s vs F22 in the diffs. The diff on the M235i is 3.08, where as 335i it ranges from 3.15-3.23.

So if it fits you might get a slightly improved accel figure as well.
__________________

Last edited by Luftwaffe1O1; 05-17-2019 at 07:20 PM..
Appreciate 2
ghost.M14.50
8Bmw166.00

      05-17-2019, 08:20 PM   #17
arhoads335i
Captain
154
Rep
706
Posts

Drives: 2015 435i grand coupe xdrive
Join Date: Jan 2017
Location: Philadelphia, PA

iTrader: (2)

Garage List
2008 BMW 128I  [0.00]
Sooo buy it or not lol
__________________
2015 435i grand coupe xdrvie (current)
2006 F250 powerstoke CCSB (current)
2014 M235i Black on Red (SOLD) / 08 e90 335i MT Pure Stage 2 High flow (SOLD)
08 128i 6MT (SOLD) / 08 335i 6MT Pure stage 1 (SOLD)
Appreciate 0
      05-20-2019, 03:14 PM   #18
Dylan86
Colonel
Dylan86's Avatar
Canada
1218
Rep
2,166
Posts

Drives: Hard
Join Date: Jan 2016
Location: GTA

iTrader: (0)

I am taking a stab at this, to suggest (at least) that the LSD itself is cross compatible. The case, however, is the question. Take both pumpkins loaded to a Transmission shop and have them review the spec's on both. One will obviously have the different final drive. The trans shop should be able to swap everything over for you, within a couple of hours.

I'd honestly just have them pop off the ring gear from the F22's stock open diff, transfer it to the LSD, and re-install the LSD into the F22 pumpkin. Sounds like the path of least resistance aside from just trying to dry fit the F30 rear end, and find out later that the car doesn't like it. I would not want to swap a rear end out twice, that's for sure.

GL, keep us all posted! This is exciting

Quote:
Originally Posted by ghost.M View Post
I have F80 lowering springs and F30 sways bars on my M235i so it seems I will be the guinea pig for another cross platform modification haha. I went ahead and ordered it earlier this week from another seller and it was about $620 shipped. Can't beat that price, and should be easy to resell if necessary. It won't arrive until July as they are backordered from Germany so it will be some time before I can have it installed on the car. Excited to see how this works and love to see the discussion that has developed!
__________________
Appreciate 1
ghost.M14.50

      05-22-2019, 01:29 PM   #19
Pairadime
New Member
7
Rep
24
Posts

Drives: 2015 M235i
Join Date: Jun 2018
Location: British Columbia

iTrader: (0)

I had a similar thought a few months ago regarding the M2 diff.
https://www.2addicts.com/forums/show....php?t=1559198
Unfortunately the M2 uses different axles and hubs so definitely not plug and play. However your idea of switching the innards seems completely plausible. Except the ring gear is actually welded in the open diffs, so swapping ring gears might be an issue.

Last edited by Pairadime; 05-22-2019 at 04:36 PM..
Appreciate 0
      05-22-2019, 11:12 PM   #20
ghost.M
Private
United_States
15
Rep
59
Posts

Drives: 2015 BSM M235i 6MT
Join Date: Sep 2018
Location: LA

iTrader: (0)

Quote:
Originally Posted by Luftwaffe1O1 View Post
Quote:
Originally Posted by ghost.M View Post
I have F80 lowering springs and F30 sways bars on my M235i so it seems I will be the guinea pig for another cross platform modification haha. I went ahead and ordered it earlier this week from another seller and it was about $620 shipped. Can't beat that price, and should be easy to resell if necessary. It won't arrive until July as they are backordered from Germany so it will be some time before I can have it installed on the car. Excited to see how this works and love to see the discussion that has developed!
Omg please keep us posted, if this is true, I will order it also, this is like the deal of the century haha.

edit: one thing I have noticed immediately is that the ratios are different for F30s vs F22 in the diffs. The diff on the M235i is 3.08, where as 335i it ranges from 3.15-3.23.

So if it fits you might get a slightly improved accel figure as well.
Yes that is something I noticed as well. Bummed it'll take so long to ship but if it fits the shorter gear ratio will be nice!
Appreciate 0
      05-22-2019, 11:19 PM   #21
ghost.M
Private
United_States
15
Rep
59
Posts

Drives: 2015 BSM M235i 6MT
Join Date: Sep 2018
Location: LA

iTrader: (0)

Quote:
Originally Posted by Dylan86 View Post
I am taking a stab at this, to suggest (at least) that the LSD itself is cross compatible. The case, however, is the question. Take both pumpkins loaded to a Transmission shop and have them review the spec's on both. One will obviously have the different final drive. The trans shop should be able to swap everything over for you, within a couple of hours.

I'd honestly just have them pop off the ring gear from the F22's stock open diff, transfer it to the LSD, and re-install the LSD into the F22 pumpkin. Sounds like the path of least resistance aside from just trying to dry fit the F30 rear end, and find out later that the car doesn't like it. I would not want to swap a rear end out twice, that's for sure.

GL, keep us all posted! This is exciting

Quote:
Originally Posted by ghost.M View Post
I have F80 lowering springs and F30 sways bars on my M235i so it seems I will be the guinea pig for another cross platform modification haha. I went ahead and ordered it earlier this week from another seller and it was about $620 shipped. Can't beat that price, and should be easy to resell if necessary. It won't arrive until July as they are backordered from Germany so it will be some time before I can have it installed on the car. Excited to see how this works and love to see the discussion that has developed!
Yes that is definitely an option I hadn't considered. It's shipping to my race shop (Dirty Euro Customs) here in SLC as they've helped me with all of my experimentation so far and can literally do anything and everything you could want them to. We looked over the specs for both diffs on realoem together and there weren't noticeable differences in the pumpkins, axles, mounting hardware, etc, but we'll only know for sure once we try it out. They were down to give it a shot so if the whole pumpkin doesn't fit for whatever reason I'll either sell it or try swapping the internals. Good call!
Appreciate 0
      05-22-2019, 11:23 PM   #22
ghost.M
Private
United_States
15
Rep
59
Posts

Drives: 2015 BSM M235i 6MT
Join Date: Sep 2018
Location: LA

iTrader: (0)

Quote:
Originally Posted by Pairadime View Post
I had a similar thought a few months ago regarding the M2 diff.
https://www.2addicts.com/forums/show....php?t=1559198
Unfortunately the M2 uses different axles and hubs so definitely not plug and play. However your idea of switching the innards seems completely plausible. Except the ring gear is actually welded in the open diffs, so swapping ring gears might be an issue.
That's true, the ring gears are welded on these so swapping the internals is probably not worth the effort. Really hoping it fits perfectly!

M2/3/4 have completely different rear end incl subframe and electronic clutch diff so makes sense that won't be an easy crossover. Even if it did fit, the M235i isn't wired to take advantage of those diffs,,, would it even lockup?
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 03:54 AM.




2addicts
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