LSD

[cpt97m3]

Originally Posted by int2str

Not a good one

Somebody here has done it, I believe. But since the dimension and the placement on the car are different from the 135i, other changes are required. At a minimum, M3 half-shafts are necessary, I believe.

The other options mentioned in this thread are much more sensible IMHO.

And you need the M3 subframe, so it's not real practical unless you have a lot of money. As int2str said, the bolt in options are the way to go on a 135i.

[flinchy]

Originally Posted by BrokenVert

Andre, gear type LSDs tend to become open diffs when one wheel has zero traction - so a lifted wheel or driving on bad ice/snow.

Clutch type diffs don't have this issue. They allow full lock in zero traction scenarios.

That being said - the ediff on our cars is will active no matter what. So it takes some of the issue with gear types away

not sure about 135's, but in my 130... hold down the DTC button for 10 seconds, 100% off, side ways single wheel spinning action lol

[1&done]

OEM, easy swap if you have a n55...1M drive shaft, 1M/M3 output shafts, M3 diff.

[1&done]

Originally Posted by cpt97m3

And you need the M3 subframe, so it's not real practical unless you have a lot of money. As int2str said, the bolt in options are the way to go on a 135i.

That's what people say but not true. It has been done in a 335. OEM LSD is a clutch type so requires maintenance. It will also come w/ a finned diff cover to aid in cooling.

"What's the best LSD" depends on what you plan to do w/ your car. i.e. track or DD.

[haitham87]

Originally Posted by 1&done

That's what people say but not true. It has been done in a 335. OEM LSD is a clutch type so requires maintenance. It will also come w/ a finned diff cover to aid in cooling.

"What's the best LSD" depends on what you plan to do w/ your car. i.e. track or DD.

Driftinggg

[uberschnell]

Originally Posted by haitham87

Driftinggg

it's easy to drift the hell out of a gear diff, trust me

[shah269]

How about for just daily driver with snow issues?
There is nothing more fun than spinning a tire all day and night in the snow.
Will a gear SLD help with this?

[BrokenVert]

Originally Posted by shah269

How about for just daily driver with snow issues?
There is nothing more fun than spinning a tire all day and night in the snow.
Will a gear SLD help with this?

No it wouldn't. Gear type LSDs become open diffs when 1 wheel is unloaded/has zero traction.

[shah269]

I've driven cars with gear LSD's but never one in the snow....shucks had my hopes up!

[GaryS]

Originally Posted by BrokenVert

No it wouldn't. Gear type LSDs become open diffs when 1 wheel is unloaded/has zero traction.

Wavetrac has a center friction plate that grips under low-load and zero-load conditions.

http://www.autotechdriveline.com/a_wavdiff.shtml

But Wavetrac is still not close to a real clutch-type LSD for controlled drifting.

[BrokenVert]

Originally Posted by GaryS

Wavetrac has a center friction plate that grips under low-load and zero-load conditions.

http://www.autotechdriveline.com/a_wavdiff.shtml

But Wavetrac is still not close to a real clutch-type LSD for controlled drifting.

Didnt know that. Its not a "gear type" perse? - sort of a bastardized hybrid then.

[omar14711]

Look into Diffsonline, Dan took good care of me, perfect diff no annoying noises.

[Pyrat 2]

Originally Posted by smw356

From my research the biggest downside to the clutch type ones is the fact that our OEM diff housing doesn't have a drain plug, which makes changing the oil a PITA.

I'm looking to buy my LSD for my 135is. I had one built for my e90 330i and have the following observations:

• Regarding the drain plug. This is a non-issue. I had one installed when I had my LSD built.
• The clutch type LSDs will start to lock under high torque conditions regardless of whether there is slip. In corners under acceleration you will get some understeer caused by the diff locking even in conditions where the traction is good and there is no reason for the diff to be locking.

I expect that because of the later and because I will be on the road most of the time and not on the track I will get a quaife for my 135is.

[Evice]

My racecar has a diff built by Diffsonline, and for my 128 I will not hesitate to get one from Dan.

That said I wanna expand HeelToe's explanation; there is also something called breakaway preload ... Basically when you approach/enter a turn, the car needs to overcome the preload to break the "locking" between wheels. So that car can actually turn, like an open diff if yiu will... You need to adjust your driving accordingly at track or at street

[mikal7]

So seriously why aren't the m3 diffs an option?

[yawn]

Originally Posted by mikal7

So seriously why aren't the m3 diffs an option?

As was mentioned above, you'll need more than a diff transplant - subframe also amongst other things.

[skyblue32]

guys/gals -

got a deal with Wavetrac for installation of LSD but need a 7-speed rear diff to send out, get fitted and then resell my factory pumpkin...

anybody got a DCT factory diff that needs a trip to california?

thanks.

[GeeRam]

Originally Posted by sharkatron

As was mentioned above, you'll need more than a diff transplant - subframe also amongst other things.

Yup, basically the whole complete rear end setup from a M3, and a 1M or custom propshaft, and then swap over the 135 rear brakes into that M3 setup.