Mechanical Limited Slip Differential options for 135i?

[M3_Dust]

so, are there any real options available yet to swap the diff. out on these cars and get rid of the "1 turner burner" syndrome? If so, what are they, what are the costs, and where are the parts available?

thanks :smile:

[Gabriel]

Long time question of mine as well. It will make a huge difference...

[Noize]

First, you'd have to find a way to disable the brake assist system, which is not manually defeatable. I'd like to see it happen, but it would be a rather large undertaking.

Next, newer (late 07 and up) 3series diff swaps saw a change in manufacturing and a move to a sealed unit that makes opening the diff extremely difficult. The 135i should be the same in this regard.

Cliffs: I think we're sunk.

[Gabriel]

won't the brake assist be less active if the car has more traction and distributes torque more accordingly to the load and friction?

My question is if there is a complete differential to replace the entire diff rather than a core to make it lock like the quaife.

BMW did it with the 325ti and prevented a good car from becoming great. Now they do it again.

[Noize]

Originally Posted by Gabriel

won't the brake assist be less active if the car has more traction and distributes torque more accordingly to the load and friction?

My question is if there is a complete differential to replace the entire diff rather than a core to make it lock like the quaife.

BMW did it with the 325ti and prevented a good car from becoming great. Now they do it again.

With an LSD, you'd want brake assist to be gone completely, or the car will risk a chance of not behaving properly.

AFAIK, there is no complete differential replacement in the works.

[imported_mega]

lsd will cause the brake assist to rarely ever come on

if you turn off traction control, and leave on stability control, the brake assist for the electronic LSD is not even active


I too am hoping something affordable comes out, if not I'll be spending 5000 $ on a complete rear end with quaffe

[Gray135i]

This is a response from a supplier of the Quaife on the 335i.
Quote:
Originally Posted by Gray135i
I assume the 135i is welded as well. Do you know if the final drive from the 335 will fit a 135? If not, do you have plans to make one for the 135 if you haven't already? Thanks


Yes, some are welded.

I will need your VIN, production date and transmission type. And if possible, we would like the part numbers on the sticker on the top side of the final drive unit. You will need a mirror to see this one.

From what we have seen, the 335i and 135i shares the same final drive unit. We do have a brand new final drives ready for the Quaife install depends on what you have.

Regards,

Harold

It looks like they sell the drive units in two ways. The whole rear pumpkin if your rear dif is welded or just the LSD unit if your dif is bolted.

http://www.e90post.com/forums/showth...ghlight=quaife

[ML]

This has been discussed many, many times before. SEARCH!

[imported_mega]

searching is only so good, everyone hates it when a thread gets bumped back from the dead

[larryn]

Then don't bump it, if you find it and it answers all of your questions. There are options that are in 135i's right now. Search for user Advevo, who has one in his car.

The electronic e-LSD does not interfere with the mechanical diff. Also, our diffs are welded.

[imported_mega]

welded?!?

ohh right ring gear welded

[M3_Dust]

Originally Posted by ML

This has been discussed many, many times before. SEARCH!

don't assume that I didn't and don't already know about the one car that has a LSD. I want to know if there are new and more economical options yet, which apparently there are not.

thanks for your help.

[TMc135]

Not sure if you will get any updated info but in speaking with TC Kline a few weeks back, he mentioned how much he loves his 1 but that he is going to get rid of the e-dif (that he doesn't like) and put in a mechanical dif. I didn't have time to inquire what he was going to use but it might be worth it to call him and inquire since he is about to do the same thing. Best of luck. Keep us posted.

[Gabriel]

If I were to pay the price for a full differential, I wouldn't want a quaife... I'd rather have a disk LSD and pay the additional maintainance cost...

[F0Bman]

You guys really need to check out KAAZ, Quaife, or Cusco. They have made LSD for BMW applications that kick butt.

[ronnyek]

Is the ediff in the 135 THAT bad?! I know its not the same caliber I Am sure, but lots of ferraris and stuff run ediffs, not that ferrari is end all be all, but I imagine they have some knowlege of it.

Is the ediff bad, or are people's panties in a wad because its just not a manual diff?

[M3_Dust]

the e-diff is bad, it's just a tweek on the ABS and traction control systems.

how about this question for anyone who may know, is it possible to fit the M-variable lock differential from an E36 or E46 M3 to a 135i? I'm guessing the answer is "no".

[mikeo]

Originally Posted by M3_Dust

the e-diff is bad, it's just a tweek on the ABS and traction control systems.

how about this question for anyone who may know, is it possible to fit the M-variable lock differential from an E36 or E46 M3 to a 135i? I'm guessing the answer is "no".

That is definitely a 'no'. I don't agree that the e-diff is bad either. Sure better than what the non-M 3-series has.

[jeremyc74]

Originally Posted by mikeo

I don't agree that the e-diff is bad either. Sure better than what the non-M 3-series has.

I'm with you on that. I think a lot of people here don't realize that the e-diff isn't even active until the traction control/stabilty control is completely turned off. With them turned on, the car will try to spin the inside tire. With the them turned off, it will powerslide.

[M3_Dust]

Originally Posted by jeremyc74

I'm with you on that. I think a lot of people here don't realize that the e-diff isn't even active until the traction control/stabilty control is completely turned off. With them turned on, the car will try to spin the inside tire. With the them turned off, it will powerslide.

I look forward to trying, for now, I will take your word for it since you have such good taste in color choice. :wink:

[jeremyc74]

Originally Posted by M3_Dust

I look forward to trying, for now, I will take your word for it since you have such good taste in color choice. :wink:

Thanks.


Don't get me wrong, a mechanical LSD would certainly be better on the track, but the e-dif is reasonably effective. The real issue I see with it is heating of the brakes on longer runs.

[WAY]

Mikeo, e-diff is better than non e-diff, that I agree. I would lose traction so easily (before the stability control cuts in) without the e-diff compared to when I turn the e-diff on. HOWEVER, on the track, it sucks with my modded car (engine mod = chip, downpipe, intercooler). I was at the track today and my rears were spinning like an open diff especially exiting onto the two main straights on this track. It wasn't as much of an issue before I did my engine mods. Mine you I have KW clubsport suspension as well which is set up to give me more rear end grip. (however my tyres are getting worn though).

There is a member in Australia who has already got Quaife in his car. He had to have the welded rear diff machined. Two other installation of Quaife is happening in the next month locally. As for myself, I prefer the Drexler unit with a shorter final ratio. Exploring that option now.