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  #1  
Old 09-10-2002, 07:25 AM
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Diff Swap: you are invited

If anyone wants to come to my house on Sunday, Andy and I are swapping my 3.15 differential for a Z3 3.0i Auto 3.46 diff. I've never swapped a diff before, so this should be fun.

FYI:
1999-2000 S52 M Coupe diff = 3.23
2001-2002 S54 M Coupe diff = 3.15, no gas guzzler
2001+ S54 M3 diff = 3.64, gas guzzler even with 6th gear

Worst case everyone can stand around a Seattle suburbian neighborhood and talk about their cars. My neighbors already think I am a tad bit eccentric, so this should be icing on the cake. Heck, if we get the diff installed and the car running, we can go for a test run on Mountain Loop Highway.

Actually, I am skeptical we will get it done in a day considering I want to swap the M diff cover for the Z3 diff cover. But who knows.

Diff Swap Thread 1

Diff Swap Thread 2

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  #2  
Old 09-10-2002, 08:09 AM
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scottn2retro scottn2retro is offline
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Dang!

Too bad I'm not in the area - I'd definitely be there.

Look forward to the updates
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  #3  
Old 09-10-2002, 08:14 AM
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Nick325xiT 5spd Nick325xiT 5spd is offline
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Aren't you giving up an LSD?
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  #4  
Old 09-10-2002, 08:32 AM
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Quote:
Originally posted by Nick325xiT 5spd
Aren't you giving up an LSD?
No. Both are limited slip. 3.46 is a Torsen type.
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  #5  
Old 09-10-2002, 08:50 AM
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Quote:
Originally posted by JonM


No. Both are limited slip. 3.46 is a Torsen type.
Grrr... That's irritating... So even some of the non-M Z cars got real diffs...
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  #6  
Old 09-10-2002, 08:53 AM
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Quote:
Originally posted by Nick325xiT 5spd
Grrr... That's irritating... So even some of the non-M Z cars got real diffs...
If you are really bored or are getting ready to go on Jeapardy... read this from the Torsen website on a T-2A type diff Torsens are torque-sensing, limited slips are speed sensing.

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  #7  
Old 09-10-2002, 08:58 AM
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The HACK The HACK is offline
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Anyone here (JonM, Styger...etc) know if the Z3 diffs will fit an E46?
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  #8  
Old 09-10-2002, 10:19 AM
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Quote:
Originally posted by The HACK
Anyone here (JonM, Styger...etc) know if the Z3 diffs will fit an E46?
No idea. I think it is worth noting:

E46 325 manual = 3.15 diff (mysteriously matches S54 M Coupe)
E46 325 auto = 3.46 diff (mysteriously matches Z3 auto)
E46 330 manual = 2.93 diff
E46 330 auto = 3.38 diff

I have not done any E46 research on this. I just grabbed the final drive ratios from BMW USA. It may just be a coincidence the 325 and M coupe/roadster both have 3.15s. On the other hand, it may not be a coincidence.

I suspect 330 owners would benefit from an upgrade to a 325 diff. No idea if this works... pure speculation on my part.
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  #9  
Old 09-10-2002, 10:29 AM
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Interesting . . .

Kaz and I were contemplating my 3:15 (01 M Roady) for his 3:46 (e46 wagon)
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  #10  
Old 09-10-2002, 10:32 AM
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The 3.15 diffswap seems to be something that goes on pretty regularly with 330 owners. Guess what Dinan charges $1400 for???

Late 01 and later 325iT MT get the AT diff, and I will attest to the fact that the resulting 'granny gear' 1st is punchy. Also as a result, I can't make it to 60mph in 2nd.

A friend of mine with a E36 '330is' ran its original 318is diff in it till recently, and said before the swap, 1st gear was essentially useless. So it is possible to over-do it.
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  #11  
Old 09-10-2002, 10:33 AM
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Re: Interesting . . .

Quote:
Originally posted by scottn2retro
Kaz and I were contemplating my 3:15 (01 M Roady) for his 3:46 (e46 wagon)
Hmm, after what JonM just mentioned about the LSD, maybe you WOULDN'T want to do this...
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  #12  
Old 09-10-2002, 10:39 AM
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Re: Re: Interesting . . .

Quote:
Originally posted by Kaz


Hmm, after what JonM just mentioned about the LSD, maybe you WOULDN'T want to do this...
Is the diff in The T not limited slip?? Appears it is not from bmwusa.
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  #13  
Old 09-10-2002, 10:42 AM
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Re: Re: Re: Interesting . . .

Quote:
Originally posted by JonM


Is the diff in The T not limited slip?? Appears it is not from bmwusa.
E46 diffs except for the clunky oddity in the M3 are all non-LSD and is a source of frustration for some, especially Nate.
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  #14  
Old 09-10-2002, 10:44 AM
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Re: Re: Interesting . . .

Quote:
Originally posted by Kaz


Hmm, after what JonM just mentioned about the LSD, maybe you WOULDN'T want to do this...
If yours is not LSD, then you're right.
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  #15  
Old 09-10-2002, 10:45 AM
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JonM, you south of Seattle or north? I'd come if the wife wasn't working, I don't feel much like dragging my 3 and 6 year old over there. I might even get motivated to do my own work on my cars!
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  #16  
Old 09-10-2002, 10:53 AM
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Quote:
Originally posted by JonM


No idea. I think it is worth noting:

E46 325 manual = 3.15 diff (mysteriously matches S54 M Coupe)
E46 325 auto = 3.46 diff (mysteriously matches Z3 auto)
E46 330 manual = 2.93 diff
E46 330 auto = 3.38 diff

I have not done any E46 research on this. I just grabbed the final drive ratios from BMW USA. It may just be a coincidence the 325 and M coupe/roadster both have 3.15s. On the other hand, it may not be a coincidence.

I suspect 330 owners would benefit from an upgrade to a 325 diff. No idea if this works... pure speculation on my part.
Not only that, they would get a limited slip...

Time to hit the salvage yards and see if I can find some used Z3 diffs!
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Quote:
"Bench racing" about track times driven by professionals are like a bunch of nerds arguing which Princess Leia is hotter, the slave Leia or the no-bra jail-bait Leia. No matter how compelling your argument is, the plain and simple fact is, none of you will EVER get to hit that.
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  #17  
Old 09-10-2002, 10:56 AM
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scottn2retro scottn2retro is offline
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Quote:
Originally posted by The HACK


Not only that, they would get a limited slip...

Time to hit the salvage yards and see if I can find some used Z3 diffs!
Another HACK project in the making

Ssshhhhh!

Don't tell Nate

Last edited by scottn2retro; 09-10-2002 at 12:15 PM.
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  #18  
Old 09-10-2002, 12:10 PM
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Quote:
Originally posted by Ripsnort
JonM, you south of Seattle or north? I'd come if the wife wasn't working, I don't feel much like dragging my 3 and 6 year old over there. I might even get motivated to do my own work on my cars!
North. Way North. City is called: "Damn That is Far North and Almost in Canada", Snohomish, North, WA.
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  #19  
Old 09-10-2002, 12:15 PM
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LOL< damn, that IS far north! I hear it snow up there in the summer time?
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  #20  
Old 09-10-2002, 04:25 PM
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Hi
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Quote:
Originally posted by scottn2retro


Another HACK project in the making

Dooooodddd, I am SO interested! HACK????
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  #21  
Old 09-10-2002, 04:35 PM
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The HACK The HACK is offline
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Quote:
Originally posted by Raffi


Dooooodddd, I am SO interested! HACK????
Bring me the parts and I'll do the research to make it fit...
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Quote:
"Bench racing" about track times driven by professionals are like a bunch of nerds arguing which Princess Leia is hotter, the slave Leia or the no-bra jail-bait Leia. No matter how compelling your argument is, the plain and simple fact is, none of you will EVER get to hit that.
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  #22  
Old 09-10-2002, 04:42 PM
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Hi
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Quote:
Originally posted by The HACK


Bring me the parts and I'll do the research to make it fit...
Damn, you want ME to do the research??? Where do I start???
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  #23  
Old 09-10-2002, 09:37 PM
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Take a look at page 5

http://www.world-challenge.com/compe...-2.5-01-02.pdf

Also, read the first entry http://staff.connect.com.au/lheather.../msg00280.html

So, BMW uses Zexel-Gleason Torsen LSDs in Z3s. Turner uses the 3.46 and 3.91 ZG diffs in thier world challenge E46 325i. Also, it says that the driveline components are E36. The Z3 is an E36/7, no?

BMW uses the 3.46 in the Z3 3.0i (2.8i probably too) autos and 2.5i manuals. The 3.91 in the 2.5i auto. A 3.07 is used in the 3.0 manual.

Coincedence? I doubt it. Seems like it might fit.

A 3.07 would work pretty well. The 330/328 share the same tranny ratios as the 3.0i Z3. I think 3.46 would be pretty short...

Last edited by nate328Ci; 09-10-2002 at 10:07 PM.
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  #24  
Old 09-10-2002, 10:40 PM
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OK, I took a reqlly quick look at the ETK to see how 'easy' this might be.

What I can see is that a simple swap of the entire diff won't work. At the very least, the back half of the diff assy (i.e. the cover) is quite different between E36, E36/7 and E46. E36s have 2 mounting tabs, E36/7 have 1, and E46 have none.

This means any swaparoo of diff bits between them will involve some hacking around with the various bits of each model, e.g. using a E46 housing, outdrives, etc. with guts from a E36/E36/7 or something.

Anyone wanna find a junker E46 and E36 rear end and I'll be happy to help hack the bits together.
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  #25  
Old 09-10-2002, 11:55 PM
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JonM-
I just sent you a note...
I'd be interested in seeing what you've gotten yourself into...
(unlike those 'other' folks, I'm probably less than 10 miles from ya...!)
Just let me know when and where...
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