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-   -   Noob question LSD conversion diff for e46 (http://forum.e46fanatics.com/showthread.php?t=953053)

Andrew99328i 10-29-2012 11:06 AM

Noob question LSD conversion diff for e46
 
Hi,
I was reading this post

I'm a noob, this is my first post, so it probably might be a stupid one.

moving forward, i saw this deal on craigslist (below) I have a 99 328i 5sp, and I need a LSD, this dude is selling the whole rear end axles and whatnot in decent shape for one grand, it IS off a e39 m5 and it is 3.15. As far as mounting is this possible?

http://dallas.craigslist.org/dal/pts/3371715265.html
Also i bought m3 OEM suspension parts last week should be a direct swap(correct me if i'm wrong) for shocks and struts.

Ref:
http://www.bokchoys.com/differential/GearRatios.htm
http://dallas.craigslist.org/dal/pts/3371715265.html

thanks!


http://imageshack.us/a/img96/1971/bmw5l.jpg
http://imageshack.us/a/img526/2404/bmw3r.jpg
http://imageshack.us/a/img542/4996/bmw4t.jpg_a_

DangerousMind 10-29-2012 12:52 PM

That e39 subframe will not fit in an e46. You will need to go with an aftermarket lsd unit for the e46 non-m carrier or get an m3 rear subframe and diff assembly. If you go the m3 subframe route, you will need different rear wheels due to a change in offset.

I believe that the m3 suspension fits if you knock the alignment dowel out on the front strut towers. i cannot confirm for sure though.

GSherbs 10-29-2012 01:46 PM

You said you need an LSD? Are you building a track car?

If so, there might be other avenues you would want to consider

Sent from my HTC Sensation 4G using Bimmer App

Andrew99328i 10-29-2012 02:43 PM

@GSherbs
No not building a track car thisi s my daily driver, i have a ws6 Trans am. I got this car to drive to work its nice but its slooooow. and that lack of LSD kills me. and i cant just swap the diff for and older one and all the diffs for this housing are so expensive i'd rather just but a m3 backend. :/
this car is bone stock perdy much. I just put some ebay headers on and got suspension for 100 bucks on craigslist prob gonna put a golf tee in the back. I dont wanna put too much money in it paid 4g's for it so i dont wanna spend another 1,5k on a diff u know?

@Dangerousminds
When you say knock off do you mean rethread em? or literally just cut them off?



Regards,

Andrew99328i 10-29-2012 02:45 PM

Here is a question to all: if this was your car, what would you do on it for cheap to make it reasonably fast? (please no air intake suggestions)
tnks!

aikmanson 10-29-2012 02:54 PM

Quote:

Originally Posted by Andrew99328i (Post 14855918)
Here is a question to all: if this was your car, what would you do on it for cheap to make it reasonably fast? (please no air intake suggestions)
tnks!

Not much to do for 'cheap'. Best option is to supercharge it, buy a used or new kit for 3-5k and you will have nice power.

To answer your question, If it were MY car, I would leave it stock for now and worry about maintenance and suspension.

Andrew99328i 10-29-2012 02:59 PM

@aikmanson
I asked the previous owner about maintanance: water pump hose pulley, therm housing lower collant hose upper radiator expansion tank hose heater core hose done done done....
engine rebuilt 15k ago.... so im pretty much staying with the meyle heavy duty stuff control arms and new bushings all around, (subframe upgrades also).
and then im out of things to do :/
thanks for the suggestions!

choxor 10-29-2012 03:00 PM

Cheap? Nothing.

Take it for what it is.

EverydayGetaway 10-29-2012 03:44 PM

You could piece together a turbo kit for it for reasonably cheap, but after a good tune and everything you're still going to spend at least $3k. I'm with Choxor, take it for what it is and enjoy devouring corners... I'm with you on the lack of LSD though, I nearly didn't buy my E46 based on that alone, but you get used to not having one after a while.

Sweetness 10-29-2012 04:08 PM

Not to mention you're gonna need a special tool to remove the diff.

lab rat 10-29-2012 04:40 PM

Unfortunatley the LSD option for non-M e46 is pricey. I never felt the need for the LSD even with supercharged 325.

GSherbs 10-29-2012 05:02 PM

If it were my car, my daily driver - I'd leave it as-is and focus on maintenance & reliability...

You'll never "need" an LSD for getting back and forth to work. And it probably won't change your commute time all that much

Alex323Ci 10-29-2012 05:42 PM

for all that it will cost you and what you plan to use the car for i would not do it. this is coming from someone who has put a LS unit into a non-M diff many years ago.
i absolutely loved my LSD but for the cost and effort that you say you want the car for i would pass.

also as said, the M5 diff is not what you need

TitaniumCranium 10-30-2012 12:10 AM

M3 diff and rear subframe is probably the best way to go if you are dead set on putting in an LSD, BUT it's not going to be inexpensive. There are several things to consider here. You have a 328, which without any modification to the engine or HP seem to tear out rear subframes on these cars. It can be fixed and if you plan on installing the M3 LSD then you should take the time to install one of the subframe reinforcement kits that are out there. I know there are at least two, Turner comes to mind but can't remember the other one. have it welded in by a shop and then mount the M3 subrame. You'll also need adjustable camber arms in order to align the rear end in your non-M once you shift over to the M3 subframe. Also take into consideration that the stock M3 diff is 3.62:1 which means that you'll be turning quite a few RPM going 60 in 5th gear, and first gear will be all but useless.

fiveightandten 10-30-2012 12:20 AM

The car will never be fast unless you want to dump a good amount of money into it. Abandon that idea now.

The road handling is impeccable *until* you break traction. At that point, the open diff and drive by wire (in later models) kills any sort of control you may have to steer with your right foot. But here's the thing...the rear floor pan is so weak, that driving in a manner that would require you to have a LSD will eventually tear the mounting points out (you have checked these for damage, right?).

If you want to drive it like a hooligan, put reinforcement plates in the back and spend some money on a custom diff or full M3 setup. If you want a LSD for bad weather, i'd strongly weigh your options and get some good snow tires in the mean time.

spikester550 10-30-2012 10:49 AM

Quote:

Originally Posted by aikmanson (Post 14855939)
Not much to do for 'cheap'. Best option is to supercharge it, buy a used or new kit for 3-5k and you will have nice power.

To answer your question, If it were MY car, I would leave it stock for now and worry about maintenance and suspension.

exactly what i did!

Andrew99328i 11-02-2012 10:24 AM

Quote:

Originally Posted by fiveightandten (Post 14857205)
...the rear floor pan is so weak, that driving in a manner that would require you to have a LSD will eventually tear the mounting points out (you have checked these for damage, right?).

Damage is scarce but yes, I have the rear subframe bushings to replace, prob will need someone in DFW area with an arc welder and spare time :facepalm:

WDE46 11-02-2012 12:19 PM

1 Attachment(s)
Read this BMW official file on the rear subframe problems.

Alex323Ci 11-02-2012 01:11 PM

just to correct a few misunderstandings on a Limited Slip diff. it is not only useful to just high power cars. if you think the non-Ms devour the corners now, or have impeccable road handling...with a LSD it handles much better. people often confuse a LSD for just putting down power in launches or drifting, they actually do a great deal for handling.

TerraPhantm 11-02-2012 01:32 PM

M3 LSD with M5 ring and pinion would be the way to go if you want the M-LSD with a decent ratio


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