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General E46 Forum
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Old 03-09-2012, 11:16 PM   #1
cyberlando
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s54 swap diff

Can I use my regular non m diff and drop a LSD unit in it and it be as good as the factory m3 one
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Old 03-10-2012, 01:03 AM   #2
lab rat
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Yes.
You may want to go for shorter gear ratio 3.07 for 5speed 3.38 or 3.46 for 6speed.
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Old 03-10-2012, 06:53 AM   #3
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You can't take the internals from a M3 limited slip and place them into your diff housing.

More info for your reading pleasure from an advanced search here looking for "limited slip diff" in thread titles:

http://forum.e46fanatics.com/showthr...ited+slip+diff
http://forum.e46fanatics.com/showthr...ited+slip+diff
http://forum.e46fanatics.com/showthr...ited+slip+diff
http://forum.e46fanatics.com/showthr...ited+slip+diff
http://forum.e46fanatics.com/showthr...ited+slip+diff
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Old 03-10-2012, 09:54 AM   #4
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Oh, is that what you meant?
I thought you were talking about aftermarket unit like Quaife.
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Old 03-10-2012, 10:19 AM   #5
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Hard to tell what he really meant, the title does say "S54 swap diff"
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Old 03-10-2012, 11:06 AM   #6
cyberlando
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well im not sure how to word it but as far as the diff of an m3 go would buying and aftermarket lsd unit like kaaz be just as good or even better than me having to dump my whole subframe for a m3 subframe or is the m3 subframe and diff worth it.......because its alot less work to just drop a lsd unit in the diff housing i have now on my 330

would save alot a headache
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Old 03-10-2012, 12:54 PM   #7
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Actually taking apart a diff is not that trivial. The tolerances are so tight it's easy screw it up.
A good shop will charge you 3hrs to put aftermarket LSD in (if you just bring them the diff, not the whole car).
I still don't think the OEM M3 diff is any better than aftermarket (I got quaife in my car)
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Old 03-10-2012, 01:08 PM   #8
cyberlando
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does it add alot of extra strain on the subframe adding just the lsd unit without the m3 subframe? if i was to auto x or do powerslides often
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Old 03-10-2012, 02:07 PM   #9
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Powerslides? Illegally, on wet NJ streets? No feeling like it in the world, am I right?

Um, uh, I can't answer your specific question, but I know you can trust Shanneba's skills and should read all the threads he posted for you...and I don't know lab rat that well, but know him well enough to know you should listen to him...it's not something you're likely to do well by reading about it on the Internet.

I just stopped by to answer your last question about whether an LSD would add strain to a regular rear axle setup. Of course it would; that's sort of what it's designed to do, isn't it? You want it to do more in one place on the car, that extra force is going elsewhere in the car. I don't know math well enough to do the formula for you, but there's one somewhere around. Might be Arhennius's Equation? (sp?)

Oh, also subframe. Have you already had the subframe repair done or did you do it yourself? I sure hope so. If not...well even if you have...I'd just ask if you're using this as a dedicated racecar, or just like drifting in parking lots and the like. If the latter, from what I've read, you'd be better off stopping that and just enjoy your car for what it was intended for...driving on windy roads.

You sort of like Tanner Foust, don't you?
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Old 03-10-2012, 02:31 PM   #10
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Actually id like to turn it into a dedicated track car I'm almost done gathering all the parts for my s54 swap but im trying to figure if I can leave the subframe or if the extra power with the aftermarket LSD would rip my rear end apart powersliding
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Old 03-10-2012, 02:38 PM   #11
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Have you at least reinforced your subframe?
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Old 03-10-2012, 03:09 PM   #12
cyberlando
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not as yet but i intend to very soon
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Old 03-10-2012, 06:26 PM   #13
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It's the subframe mounts on the body that fail. Doesn't matter what subframe you use if you plan on driving the car hard and add power you should reinforce mount points.

For track car you may want to go for the whole M3 rear because of the brakes and higher gear ratios.
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