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This is the place to show off your BMW to other members of the community. Post pictures and videos of your car and the modifications you have done to it. If you need a picture of something on a coupe, sedan, convertible or touring you will probably find it here!

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Old 05-02-2010, 10:33 PM   #1
cyberkaa
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M3 Differential Swap on Steptronic 325i [PICS]

So I finally got around to take pics of phase 1 of my M3 swap. I had an M3 limited slip differential installed along with many of the rear axle components. Yes, this is really attached to my 325i with a steptronic.

Here's what it looks like bolted up to my car:





The M3 parts I had installed include:
-Trailing arms
-Dust shields
-Axles
-Calipers
-Caliper carriers
-Rotors
-Brake pads
-Brake pad wear sensor
-Subframe
-Differential
-E-brake
-Wheel bearings/hubs
-Rear sway bar
-Drive shaft (modified for length and balanced)
-U-brace a.k.a. push rod
-A bunch of bushings

Just about everything else was kept original. I was able to reuse my powerflex RTABs from the non-M arms.

I had everything done at Ditos Motors in South San Francisco, CA. The entire swap took about 5 weeks, of which 4 1/2 weeks were spent figuring out what parts were needed and trying to source them.

The handling is just amazing! There's a little more understeer than before, but that should change once I upgrade the front sway bar and make some suspension adjustments. The car is a little bit quicker off the line thanks to the 3.62 (vs. 3.46) final drive ratio. Braking feels a little different, but not in a particularly bad way. The M3 rear rotors are huge compared to OEM (even the fronts!). On the plus side, they fill the wheel up nicely.



IMHO, BMW should have made LSD an option on the non-M cars.
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Old 05-02-2010, 10:37 PM   #2
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Cool story brah
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Old 05-02-2010, 10:38 PM   #3
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JK... Thats pretty sweet Kalim. So now you know what's needed can Cyberfifi Garage do an install for me
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Old 05-02-2010, 10:41 PM   #4
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Old 05-02-2010, 10:56 PM   #5
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That's awesome...

I think they should have made an LSD option for the non-m cars too or at least make them easier to swap in with less parts having to install with it
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Old 05-02-2010, 10:56 PM   #6
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this makes me horny
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Old 05-02-2010, 10:58 PM   #7
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awesome!
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Old 05-02-2010, 11:05 PM   #8
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Old 05-02-2010, 11:16 PM   #9
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Old 05-02-2010, 11:27 PM   #10
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Old 05-02-2010, 11:30 PM   #11
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So if i go to a junkyard and get an M3 LSD, it will bolt right on and I'm good to go?

If so, I'll leave right now. I need an LSD so badly.
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Old 05-02-2010, 11:33 PM   #12
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So if i go to a junkyard and get an M3 LSD, it will bolt right on and I'm good to go?

If so, I'll leave right now. I need an LSD so badly.
i want one too
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Old 05-02-2010, 11:42 PM   #13
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Quote:
Originally Posted by southpaw View Post
So if i go to a junkyard and get an M3 LSD, it will bolt right on and I'm good to go?

If so, I'll leave right now. I need an LSD so badly.
read again:

Quote:
Originally Posted by cybermeplz
The M3 parts I had installed include:
-Trailing arms
-Dust shields
-Axles
-Calipers
-Caliper carriers
-Rotors
-Brake pads
-Brake pad wear sensor
-Subframe
-Differential
-E-brake
-Wheel bearings/hubs
-Rear sway bar
-Drive shaft (modified for length and balanced)
-U-brace a.k.a. push rod
-A bunch of bushings
are all the parts needed for the swap

so if you go to a junkyard, get the whole rear subframe with all parts included, then have the driveshaft modified, then yeah
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Old 05-03-2010, 12:38 AM   #14
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nicee whats next?
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Old 05-03-2010, 01:33 AM   #15
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lookin good as always K!
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Old 05-03-2010, 02:17 AM   #16
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i want LSD.





:envious
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Old 05-03-2010, 02:20 AM   #17
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Just about everything else was kept original.
lol like what? the air that was consuming the space under your car?
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Old 05-03-2010, 02:39 AM   #18
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Couldn't you just used the Diff Sub Frame, Diff, and Half-Shaft? Swap everything from the non-m Rear Sub Frame (Trailing Arm, Rear Camber Arm, and etc)?

-TrippinBimmer

BTW: Congrats on the setup I wanna do
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Old 05-03-2010, 12:25 PM   #19
cyberkaa
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Quote:
Originally Posted by Drewdown View Post
Cool story brah
Quote:
Originally Posted by Drewdown View Post
JK... Thats pretty sweet Kalim. So now you know what's needed can Cyberfifi Garage do an install for me
lol, for sure.

Quote:
Originally Posted by -Jay- View Post


Quote:
Originally Posted by DTMdan View Post
That's awesome...

I think they should have made an LSD option for the non-m cars too or at least make them easier to swap in with less parts having to install with it


Quote:
Originally Posted by firefirefire90 View Post
this makes me horny
Cool.

Quote:
Originally Posted by dreamdrivedrift View Post
awesome!
Thanks. It sure is!

Quote:
Originally Posted by Drewdown View Post
I can take care of that for you pooner


Quote:
Originally Posted by mcr_driver View Post
i can haz?
Yes! Keep your E46 and do this mod!

Quote:
Originally Posted by from330citom3 View Post
Thanks!

Quote:
Originally Posted by southpaw View Post
So if i go to a junkyard and get an M3 LSD, it will bolt right on and I'm good to go?

If so, I'll leave right now. I need an LSD so badly.
Not quite. You're better off getting a whole rear end.

Quote:
Originally Posted by kk325xi View Post
i want one too
Do it!

Quote:
Originally Posted by firefirefire90 View Post
read again:



are all the parts needed for the swap

so if you go to a junkyard, get the whole rear subframe with all parts included, then have the driveshaft modified, then yeah
Yup. For models with the 4-bolt differential flange (like my 325i), you'll need to get a 6-bolt drive shaft and modify that.

Quote:
Originally Posted by BMWPower06 View Post
nicee whats next?
S54 swap!

Quote:
Originally Posted by m330 View Post
lookin good as always K!
Thanks, P!

Quote:
Originally Posted by SL Blak Soldier View Post
i want LSD.





:envious


Quote:
Originally Posted by JJR4884 View Post
lol like what? the air that was consuming the space under your car?


Well, the wishbones were common between the M3 and my car. So were almost all of the bolts.

Quote:
Originally Posted by TrippinBimmer View Post
Couldn't you just used the Diff Sub Frame, Diff, and Half-Shaft? Swap everything from the non-m Rear Sub Frame (Trailing Arm, Rear Camber Arm, and etc)?

-TrippinBimmer

BTW: Congrats on the setup I wanna do
It's a lot easier for a 330 than a 325. The axle shafts are thinner on the 325, which means the M3 ones won't fit 325 trailing arms. You can't bolt the 325 shafts to the M3 diff either because the M3 flanges have a larger diameter. I believe the 330 trailing arms will accommodate the M3 axles fine so you would only need the parts you listed (and miscellaneous things like the push rod). 330s also have a 6-bolt differential flange so you just use your OEM drive shaft. On the plus side, I did get a brake upgrade out of it.

Thanks!
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KW V2 | BBS GT4 RE | Falken FK452 | Alcon 6-pot 365mm BBK | M3 steering wheel | Powerflex bushings

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Old 05-03-2010, 02:12 PM   #20
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This has to be like the only time ive ever seen a Kalim multi-quote
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