With the new 135i M running the M3 diff, anyone know what other parts are req'd?

[bradford]

Is the M3 rear subframe required? Rear axles? I read in Roundel that the 135i M (or whatever they're calling it) is utilizing the M3 bearing housings, but I'm just wondering what else you need to run the OEM M3 diff.

[bradford]

That sounds awesome. Link to details or post?

[cwg]

+1

[ErvGotti]

+2

Although I believe the quaife and wavetrac units are good, an OEM part would be awesome.

[pixelblue]

Wonder if it will be priced competitively. I will be down if that's the case

[ErvGotti]

Originally Posted by pixelblue

Wonder if it will be priced competitively. I will be down if that's the case

If it is available I'm hoping for $1000-1500. Having a welded diff sucks, this way I can still keep the stock diff if needed.

[pixelblue]

Isn't the wavetrac going for $1100 800 for the kit? Add another 4-6 hours of labor you would be looking at $2500. Isn't this what a wavetrac installed run?

[bradford]

Originally Posted by maxnix

I can't remember in which Forum, but probably here. i think it was in the 1 Forum where he asks what people would lilke to see for the 1 and intitially says no LSD for the 1, then changes it after another communication from BMW.

Read through this post:

http://www.1addicts.com/forums/showthread.php?t=405013

Looks like later on in the thread he indicates that a BMW Performance LSD option has been scrapped. :-/

[HP Autosport]

Originally Posted by maxnix

Well, a Quaife for the welded ring gear are $4K+ (without labor) and only a $800 allowance for the welded differential. So.......

Quaife has the only DCT LSD application right now. $4600 will get you a Quaife complete final drive, Eeverything is new and you get to keep your existing open final drive!

Alternatively, you can turn it in for a $800 credit. However, we are thinking to make the credit $1000 so we can sell more units and offer Quaife low mileage DCT final drives.

[onefastman]

Man I really want a lsd but, like the others, its just so much money...

[M_Anthony]

I've been spoiled by Peloquin diffs for years. I wish he made something for this car.

[HP Autosport]

Originally Posted by M_Anthony

I've been spoiled by Peloquin diffs for years. I wish he made something for this car.

Do you have a DCT or 6 MT?

[SlickShift]

I might be delerious, but if the BMW Performance LSD is under $1500 I'm onboard.

[BerkTechnology]

Originally Posted by bradford

Is the M3 rear subframe required? Rear axles? I read in Roundel that the 135i M (or whatever they're calling it) is utilizing the M3 bearing housings, but I'm just wondering what else you need to run the OEM M3 diff.

The M3 diff will bolt into the 135/335 subframe but you have the driveshaft & axle to deal with.

From the spy shots I've seen it looks like the 1M uses the complete M3 rear end.

Here's a cost breakdown from what I can see:

$1800 - M3 diff
$800 - L/R axles
$700 - M3 driveshaft which you will have to cut in half
$500 - labor for custom franken-shaft

~$3800 before labor to actually bolt everything in. So don't let the lower cost of the diff seduce you just yet since there's $2000 in "support" parts you need to put that in your car.

[ErvGotti]

Originally Posted by BerkTechnology

The M3 diff will bolt into the 135/335 subframe but you have the driveshaft & axle to deal with.

From the spy shots I've seen it looks like the 1M uses the complete M3 rear end.

Here's a cost breakdown from what I can see:

$1800 - M3 diff
$800 - L/R axles
$700 - M3 driveshaft which you will have to cut in half
$500 - labor for custom franken-shaft

~$3800 before labor to actually bolt everything in. So don't let the lower cost of the diff seduce you just yet since there's $2000 in "support" parts you need to put that in your car.

I thought the reason the M3's diff doesn't fit into the 3 or 1 series is because of the V8 instead of the I6tt. So if the 1M has I6tt shouldn't the drive shaft fit? I'm just speculating I guess we wont know till it's out.

[black e]

Originally Posted by ErvGotti

I thought the reason the M3's diff doesn't fit into the 3 or 1 series is because of the V8 instead of the I6tt. So if the 1M has I6tt shouldn't the drive shaft fit? I'm just speculating I guess we wont know till it's out.

Originally Posted by maxnix

I bet that's a good guess if the clutch unit is the same.

rear diff has nothing to do with the "type" of engine, it works the same in ANY engine configuration........

[BerkTechnology]

Originally Posted by ErvGotti

I thought the reason the M3's diff doesn't fit into the 3 or 1 series is because of the V8 instead of the I6tt. So if the 1M has I6tt shouldn't the drive shaft fit? I'm just speculating I guess we wont know till it's out.

Input flanges are different for the M3 vs. 135.

Just speculating on from what I can see from the spy photos. It looks like the 1M uses the M3 subframe, and from the pics the M3 diff case. Which leads me to deduce the M3 diff as well. Again, all speculation on my part but that's what I can see from the photos.

I feel like we're scientists looking at pictures from Mars and trying to figure out what we're looking at.

[ErvGotti]

Originally Posted by black e

rear diff has nothing to do with the "type" of engine, it works the same in ANY engine configuration........

I'm actually talking about the length of the drive shaft. The reason people dont swap the diff's in the M3 into a 335i is because the the way the S65 sit's in the chassis compared to the N54. You would have to create the frankenshaft as suggested by berk.

So my theory is that because the new 1M has the N54 with the M3 diff then the drive shaft should be the same length between the 1M and 135i. Meaning we might not need the frankenshaft as suggested by Berk.

[GeorgeSmooth]

I have done the M3 diff mod on my car and as Berk has commented you will need to fabricate a shaft or mate the rear M3 shaft to the 135/335 front portion after the universal joint. In the case of the 135i the shaft will obviously be available for the manuals and the auto will need some modification as its slightly longer. The diff and its housing bolts straight in and you will need to source M3 driveshafts although I have suspicion that the driveshafts might not fit as the 1 series has a smaller track than the 3. Best bet is a Quaife system or wait till the 1 series M is released and compare part numbers.
I know a competing tuner has attempted the mod on the 1 series locally and it seems without success as there was no news after the attempt.

[RimasRS]

1M is wider than 135i that means shafts will be longer. Is diff same like M3? You can compare last gear ratio at least I don't remember #

[myke354]

ok this is what i dont get .. y do most of you guys always fall back onto the oem bmw stuff?? if the m3 diff bolts right in y doesnt someone look outside the box and call dss and other places here in the usa to have custom axles made that will in the end be stronger .... the cost of a custom drive shaft is nothing 1500 for carbon fiber and like 500 for steel..
axles arent more the a grand from dss as i have already called ..

[brracing]

Just to make sure people know that there are more options out there for the current 135i.
We have a custom LSD from Performance Gearing (Jim Blanton)....who has been building custom race diffs for all BMWs for years...we've been using his stuff in our race cars for over 11 years.
We have the larger rear diff case, and the 3:46 rear diff ratio from the automatic version, with custom LSD ratios and ramp rates....and the price is reasonable to us ($2450 from us or from Performance Gearing).
We drive our unit on the road on a daily basis, and ran this unit in our BRracing BMW E82 135i project car at the Global Tuner Grand Prix with great success. So, you can get all the same type of features and more now, and for a lesser price than the Quaiffe or the new 1M / M3 version.
Bruce
BRracing