[dsjr2006]

Anyone running a helical or Torsen limited slip diff like Quaife, M-Factory, Wavetrac that can chime in on their experience with one wheel having no load or traction?

My previous vehicle had a clutch/plate type LSD so that's what I'm familiar with, but I'm thinking about switching to avoid maintenance. I'm wondering if the E-Diff function of DSC is enough to overcome the no-load problem with these diffs?

I was checking out Youtube and there was a video of an E46 with a Wavetrac that was basically immobile when one drive wheel was one ice and DSC disabled, but the E90 with E-Diff might be different?

[feuer]

Can you post a link from said YouTube video. I imagine flaws with how the test was conducted.

[dsjr2006]

Originally Posted by feuer

Can you post a link from said YouTube video. I imagine flaws with how the test was conducted.

This is actually not no-load, it’s just very low friction on one side. I’d expect it to perform better here than if one side was in the air for example.

There’s also this; which is questionable.

[langsbr]

Mfactory addresses this - not that i like their answer.


http://support.teammfactory.com/supp...pe-lsd-s-only-

[dsjr2006]

Originally Posted by langsbr

Mfactory addresses this - not that i like their answer.


http://support.teammfactory.com/supp...pe-lsd-s-only-

Yea. That’s just confirming what’s already known. I’m trying to find out about owners experience.

[feuer]

I'm not sure what do you expect but LSD in above videos seem to be working as designed, no?

[dsjr2006]

Originally Posted by feuer

I'm not sure what do you expect but LSD in above videos seem to be working as designed, no?

I’m asking how it works with traction control. What I don’t want is the situation in the lower vehicle where it doesn’t even move with an LSD. I’ve always had clutch style LSDs so I’m hesitant to switch. A clutch style would move away much quicker than that E46 with the Wavetrac.

[feuer]

Originally Posted by dsjr2006

I’m asking how it works with traction control. What I don’t want is the situation in the lower vehicle where it doesn’t even move with an LSD. I’ve always had clutch style LSDs so I’m hesitant to switch. A clutch style would move away much quicker than that E46 with the Wavetrac.

On this platform people with LSD code out the electronic assistance from the e-diff. I think it doesn't move because the front wheels are blocked. These aren't locker diffs. Whether clutch style would move forward faster I'm not sure. I would assume so after the initial few feet.

[nikitino25]

Is it true that '07 models don't have the e-diff?

[dsjr2006]

Originally Posted by nikitino25

Is it true that '07 models don't have the e-diff?

I think some don’t. You’ll have to use search.

[techwhiz]

Originally Posted by feuer

I'm not sure what do you expect but LSD in above videos seem to be working as designed, no?

I'm with you. What's the issue?

The solution to Wavetrac and mFactory no traction situations is the brake.
If you have DSC+T and have not coded it out, the car will handle it.

What issue am I not understanding?
I have the mFactory diff and I have yet to be in a situation with no traction, but then I don't live where it snows or you get real ice on the ground.

[dsjr2006]

Well it snows here so I’m trying to get feedback from someone that has experience with that.

The videos both show a car that barely moves under full throttle. If that’s how it’s supposed to work then that’s not what I want. You’d get that much acceleration just from the tiny bit of friction on ice or snow anyway.

[feuer]

I don't think so. With open diff (with out assistance from ABS) one wheel will spin endlessly and car won't move at all. This is how people get stuck. Only LSD in above videos, welded diff, and "locker" would start moving the car forward immediately. Also, we don't know the info on those LSD on the videos. What ramps? What percentage of lock? Static vs dinamic lock? As far as I'm concerned the LSDs in above videos both work. Might not to your expectations but work never the less.

[dsjr2006]

Originally Posted by feuer

I don't think so. With open diff (with out assistance from ABS) one wheel will spin endlessly and car won't move at all. This is how people get stuck. Only LSD in above videos, welded diff, and "locker" would start moving the car forward immediately. Also, we don't know the info on those LSD on the videos. What ramps? What percentage of lock? Static vs dinamic lock? As far as I'm concerned the LSDs in above videos both work. Might not to your expectations but work never the less.

The LSDs in the video are both helical. There are no ramps or percentage of lock because they’re not clutch based. This is why I’m asking for the experience of someone who has one. I’ve lived in snowy climates most of my life and I can assure you a vehicle without an LSD will move even on ice if the ground is flat and there is nothing blocking the wheels like snow, it just won’t move very quickly.

I already know how a clutch LSD behaves. It would lock and the vehicle would move quite rapidly especially at 1/2 to full throttle like those videos.

I appreciate your input, but as I said I was hoping to get a chance to talk to someone that has one and who can answer some detailed questions. Guess I’ll try it and find out myself.

[feuer]

Ok, doesn't have ramps but still could have diferent locking ratios depending on the gears anywhere from 25% up to %75. So if the torque transfer is low like 25% the vehicle would move forward slowly. I'm far from an expert on helical and any LSD for that matter but believe that above LSDs are operation as designed.

[dsjr2006]

Originally Posted by feuer

Ok, doesn't have ramps but still could have diferent locking ratios depending on the gears anywhere from 25% up to %75. So if the torque transfer is low like 25% the vehicle would move forward slowly. I'm far from an expert on helical and any LSD for that matter but believe that above LSDs are operation as designed.

I've done some more research.

Helical LSD have no locking, they offer torque transfer only. It's actually all very interesting, but Helical LSDs are able to transfer a certain amount of torque from the lower resistance wheel. TLDR; if one wheel on a helical has 0 friction/traction then the transfer of 75% x 0 = 0.

The Wavetrac artificially creates some friction, but as you can see in the video it's not much. They obviously work significant better on pavement since even the unloaded wheel in a corner has significant higher than 0 resistance.

I'll probably try the Helical LSD and see how that works with the ADB/"e-LSD/e-Diff" in these cars to alleviate the no load situation on ice, snow, etc.