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2Addicts | BMW 2-Series forum BMW 2 Series (F22) Forum BMW 2 Series Coupe and Cabriolet (F22/F23) General Forum BMW M Performance LSD for M235i, 335i, 435i Arrives. Pricing and technical FAQ inside

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      05-08-2014, 05:45 PM   #45
bbenny
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Of course hwelvaar!
I completely forgot they didnt have the F20

Cheers!
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      05-08-2014, 05:50 PM   #46
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Quote:
Originally Posted by Remonster
Quote:
Originally Posted by Ramos View Post
Can someone please explain the meaning of these locking % being thrown around? Whats the difference between 30% and 100% from behind there wheel in non technical speak?
On a normal car with an open diff, if one tire slips all of the power is wasted spinning that tire while the other one with grip essentially gets no power. A limited slip differential limits the speed difference between the wheels to ensure some of the power always goes to the wheel with grip.

When you have a "25% LSD", the maximum difference in power received by the rear wheels is 25%. With a 25% diff, one side can receive up to 62.5% of the total torque while the other gets 37.5%. Higher % can be beneficial in certain situations like accelerating hard out of a corner, but higher % also increases understeer in slow corners and increases oversteer in the rain (sounds counter-intuitive but basically you are making it harder for the two rear wheels to spin at different speeds in a corner).

For a street car, I would say 20-40% is ideal. Older BMWs with LSDs like the E36 M3 had 25% lockup so this new one is actually more aggressive. The fact that it only locks 9% on deceleration means that it actually won't cause understeer on corner entry and the 30% acceleration lock is not enough to make it dangerous in slippery conditions.

The current M cars use an electronically-variable lock which allows them to vary lockup as needed. These diffs are incredible but they are much more difficult to retrofit onto a car since they need to tap into wheel speed sensors and probably the car's computer systems to function so obviously BMW didn't want to offer such a complex unit as an upgrade for the standard cars. I personally think the price and ease of installation are perfect for this LSD when you consider that it won't be noisy like some aftermarket diffs, doesn't require service as often as some aftermarket diffs (I don't believe it's truly lifetime, I'd probably replace the oil every 50-100,000 miles), and comes with a warranty.

I avoided using the term "lockup" because some people describe LSDs the opposite way where 100% lockup means there is NO difference in the speed of the two rear wheels or the power applied to each. This is, as someone above said, like having a welded diff and is what drifters use but it would be terrible to drive around with a fully locked diff all the time, the car would be very difficult to turn.
Awesome explanation, in fact the clearest I've read.
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      05-08-2014, 05:56 PM   #47
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30% isn't bad....but it would be great if it was 50% like Quaiffe.
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      05-08-2014, 05:58 PM   #48
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Yep, that's about how much I was thinking it would go for
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      05-08-2014, 06:09 PM   #49
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Quote:
Originally Posted by Remonster View Post
I avoided using the term "lockup" because some people describe LSDs the opposite way where 100% lockup means there is NO difference in the speed of the two rear wheels or the power applied to each. This is, as someone above said, like having a welded diff and is what drifters use but it would be terrible to drive around with a fully locked diff all the time, the car would be very difficult to turn.
I lost myself in the explanation. Thanks for clarifying.
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      05-08-2014, 06:30 PM   #50
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In a year you will be able to get this diff for 2200 from Tischer.

Does the price include a core charge?

If I had an F30 I would do it in a heart beat.

It's a shame that it is the whole unit, and cannot be applied to the 328i, due to the different gearing. The pumpkin is the same.
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      05-08-2014, 06:38 PM   #51
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Pointless BMW thanks.....unless you negotiate for the dealer install at port/delivery. Too bad 99.9% of the people that buy a LSD-less BMW who actually track their car, will never buy this and still go with the quaife or Dinan.
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      05-08-2014, 08:06 PM   #52
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Quote:
Originally Posted by Soorena
Quote:
Originally Posted by red-sauerkraut View Post
Not a chance.

The stability on your car is not coded for it. There is years of datalogging involved.
It's way simpler than that.
Simple yes...

BMW doesn't just add a part and not consider all aspects of how it effects the car in many different situations Therefore as simple as it sounds, It requires tons of additional datalogging.
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      05-08-2014, 08:17 PM   #53
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I wonder if port install will stick to the September time frame?
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      05-08-2014, 09:00 PM   #54
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Quote:
Originally Posted by dlbrooks18
Did we ever find out if the 435i in this video is using this M Performance LSD or is this the standard open (e)diff? It drifts really nice in this video.

Good vid!! Very nice drifting
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      05-08-2014, 09:36 PM   #55
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Looks like standard e-diff. You can see the inside tire smoking when the dsc is disengaged and other times the inside wheel locks up from having dtc. I have seen 30% lockup diffs that still light up the inside tire, but much less than this. I would venture to say it's the e-diff.
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      05-08-2014, 10:31 PM   #56
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Quote:
Originally Posted by dmboone25
Glad this is finally out - 3 grand isn't cheap, wonder how much install will be...
That's kind of the price for an LSD for BMWs ... My e36 race car diff was made by PTG and cost even more than 3 grand but it makes a world of difference.
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      05-09-2014, 01:17 AM   #57
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No love for the M135i? Would the M235i rear diff work for the M135i?
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      05-09-2014, 02:41 AM   #58
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Decide seriously!!! Scroll up a few posts!!
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      05-09-2014, 04:47 AM   #59
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Quote:
Originally Posted by scflaw
No love for the M135i? Would the M235i rear diff work for the M135i?
Question already answered on this same page.
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      05-09-2014, 06:43 AM   #60
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Quote:
Originally Posted by hwelvaar View Post
Quote:
Originally Posted by scflaw View Post
No love for the M135i? Would the M235i rear diff work for the M135i?
Question already answered on this same page.
http://accessories.bmw.com/internet_...&absoluteNav=2
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      05-09-2014, 07:01 AM   #61
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Quote:
Originally Posted by StealYourFace View Post
In a year you will be able to get this diff for 2200 from Tischer.

Does the price include a core charge?

If I had an F30 I would do it in a heart beat.

It's a shame that it is the whole unit, and cannot be applied to the 328i, due to the different gearing. The pumpkin is the same.
You can get it now for 23xx without a core change.
I put the xx because depending you location it changes due to tax and freight.
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      05-09-2014, 08:04 AM   #62
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There are no core charges for these diffs at all, as is stated in the original post.

Also, BMW will be releasing a version of this diff for the F30/F32/F33 with manual transmissions soon. The differentials are different between the manual trans and auto trans cars, so they have to be developed separately, to an extent.
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      05-09-2014, 10:03 AM   #63
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Quote:
Originally Posted by cncmastr View Post
Really?! No drain plug!? REALLY?!
Seriously, "lifetime" fill??

4 year/50K mile = lifetime in BMW world! IMHO with Lifetime Fills.
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      05-09-2014, 10:07 AM   #64
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Quote:
Originally Posted by clbmw View Post
Awesome explanation, in fact the clearest I've read.


Nice explanation but I believe the E90/92/93 M3 diff and 1M diff where mechanical full-lock, not electronic?
Can someone in the know confirm?

With that said, 30% for street is way better than open diff but it's a lot of money for 30% plus "lifetime" fill with disassembly to change oil worries me and takes a lot of the excitement about this unit out.
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      05-09-2014, 10:28 AM   #65
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Quote:
Originally Posted by NYAWE60 View Post
$3000!!! Are they out of their fucking minds??
That is why a lot of BMW guys are hanging out at the s550 forums... Mustangs come with an LSD as standard equipment! And this new Mustang rocks, so..

Ironically, can u imagine a s550, with $3k in aftermarket stuff..?


For the price of a M235i (135is), a limited slip differential should stand equipment, or at least a nominal $900 option.

Instead, BMW is laughing at us.. (it's not even a M-diff.)
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      05-09-2014, 10:52 AM   #66
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Quote:
Originally Posted by w3rkn View Post

Instead, BMW is laughing at us.. (it's not even a M-diff.)
Do you really, really think that this is making BMW a ton of money and laughing all the way to the bank?? Think about it. This is a very low volume product, for a few people who want more performance out of the F2X or F3X platform. Its a product developed specifically for a few models of car. BMW built this because of people complaining it didn't exist.

Also, you have a 135is with an open diff. I challenge you to get a LSD unit installed with labor/machining etc for less than this offering. In fact, I'd put $100 down on you not being able to. There are already a number of examples in this thread of people reporting that to do this on any car its going to cost around 3k. Plus, you have downtime because the car can't be driven with no differential.

Finally, you can't install an "M" diff in any car other than an M car because you would have to completely re-engineer the wiring harness and chassis to be able to handle it...and then you have an M car.

Sorry for the rant, but the comments going around about this are ridiculous and unfounded.
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