Kytann

Yes, of course it's electronic limited slip.
And one wheel was completely off the ground, and it was very useful and controllable.
That was my test.

Did you not read my entire post?

Kytann

Exactly!

BucketMan

Never said dangerous or risky. I'm thinking..stupid would be a better word.

Your truck, your driveway. Have at it!

vozaday

Because the Elocker does not have a true LSD, it is more of a simulated one.

Kytann

Alright, I'll bite. Why would it be stupid?

kobayashi maru

I'm aware of that but I'm curious on a mechanical level whether it's a true LSD or simulated. Both are designed to deliver more torque to the slower wheel so one would logically think that having a wheel off the ground is a pure example of this, if a little extreme.
So I have to imagine that the reason it fails in this scenario is because the torque transfer is not efficient enough hence the need for a locking diff?

Sorry for the thread-jack but I only have rudimentary knowledge of how LSDs work so I want to find out if my understanding of the testing results is correct.

RajunKajun59

Hope this answers you question some.

The Simulated works off an Open Diff, which you said you knew. This works by pulsing the brakes on the faster side. Since it is an open diff, while the brakes are engaged on the faster wheel, the slower wheel gets most of the torque, hence the reason he said it would make small jumps, and got more traction as he went faster. If he would have revved higher it probably would have fallen off the jack stand. But the system does have it's limits, as do all systems.

The mechanical LSD, either works off clutch packs or a Torsen(Spell check) system. The Torsen system uses a series of gears to transfer torque, and the clutch pack, well uses a big spring to put pressure on the axles to force torque transfer over. And with Both clutch and torsen the faster wheel, if off the ground will free spin, unless the brakes are pumped to transfer torque faster.

The video below demonstrates the brake pump, which even on an open diff is useful, but a LSD, makes it transfer faster and for longer duration, when couple with the pump. That's why I pointed out the 1 Wheel spin control on the trucks coupled with a LSD, would be pretty bad ***, it pumps the brakes faster then we ever could.

WTF150

^ this. Im willing to bet that if he gave it some gas, if would brake the airborne wheel and send power to the grounded wheel and propel the truck forward off the jackstand.

kobayashi maru

Thanks RajunKajun! That was the explanation I was looking for. So I guess I was fundamentally correct in my thinking but had some gaps in knowledge which you nicely filled in

One thing I failed to realize earlier is that the simulated LSD utilizes the ABS system to pump the brakes rather than simply apply them linearly. I see the limitation more clearly now. YouTube is blocked at work so I'll check that out later but I see what you're saying about combining brake control + true LSD.

BucketMan

Planted wheel grabs, truck goes forward, Murphy's law takes over and the jack stand grabs a brake line ABS line, etc..

Would suck to break some stuff over a question that could be easily answered here or on YouTube as others have shown.