TurboA32

iTrader: (36)

Ok I have a few questions about 6speed hlsd from 02-03 5.5 gen. I already know that if you look through the diff and if you can see through the other side clearly tjen its hlsd. My questions are when you jack the car up and spin one wheel will both wheels turn and if it doesn't turn what does it mean? Does it mean the diff is no longer working as hlsd anymore?

DennisMik

iTrader: (2)

If you raise the front wheels off the ground and turn one wheel by hand, both wheels will turn.

If you have HLSD, both wheels will turn in the same direction.

If you don't have HLSD, the 2 wheels will turn in opposite directions.

TurboA32

iTrader: (36)

Ok I know how to tell if I have hlsd what I'm asking is "when you do have an hlsd transmission" and when the car is in the air and both wheels don't turn what does that mean? Does it mean that I have to swap out the diff because its going bad?

Merlot02SE

iTrader: (1)

Try 2nd gear.

Also, I never saw a HLSD that didn't have the AE/drilled pedals. Are those in the car?

Carguy1709

Maxima's that came with HLSD. Came with upgraded polished pedals, and a different shifter ****. Another way to check if you have HLSD is open the hood and locate the vin number plate on the firewall. Then look at the trasmission code. It should have an H at the end if its HLSD.

Derrick2k2SE

iTrader: (3)

I don't think turning one wheel is a good test. I don't think much happens with it if it's not under load.

dch95

You are correct. I have an LSD and turning one wheel the other spins in the opposite direction.

Donkeypunch

That means you do not have an lsd.

Child_uv_KoRn

iTrader: (7)

Start the car. Even in neutral both wheels will spin forward.

If not, then your lsd is broken or you don't have it.

dch95

I just installed it a month ago. There is no pinion shaft visible meaning LSD. I spun one wheel forward, the other moved backwards.

Child_uv_KoRn

iTrader: (7)

Donkey punch is correct from what I've experienced (I've had three 6 speeds).

Donkeypunch

Do you have a picture?
both wheels should spin the same direction.
If you have gears in it like this it is open.

4th gen maxi

iTrader: (1)

Both wheels should spin at different rates that's what a diff does when cornering or else one wheel will hop and squeal due to the difference in rotation. Lsd comes into play when the wheel with least resistance starts spinning much faster than the other that's when both wheels start to split the torque for equal distribution.

TurboA32

iTrader: (36)

Nobody is reading what im asking

dch95

I did a cut and paste of how the HLSD works.

Helical diffs work like this: two large side gears in the carrier are connected to the axles, and a bunch of worm gears drive off of each side gear and ride on each other in the center. The worm gears connect the two side gears together, so that when one side gear turns at a different speed than the other, all of the worm gears must also turn. When there is no load (no torque) and the unit is not preloaded (some are preloaded from the factory, some aren't), you can jack up the rear end and spin one side with one finger and the other side spins very easily in the opposite direction. There is probably even less resistance than a normal open diff and spider gears. When you put power to it though, the torque drives the side gears outwards into the case, and all the worm gears get driven inwards to the bottom of their machined pockets in the carrier. The force of these gears jammed up in all of their respective slots is what creates the resistance to differentiation. All of the gears also try to walk off of the gear they're riding on, so there is axial and radial friction between every gear and the case. If you try to spin one wheel at a different speed, it must turn all of the gears in the differential while they're loaded.

The amount of force produced here can be quantified by how much torque it can hold. This is what is called the Torque Bias Ratio. Really aggressive TBR's are 5:1, most common are ~3:1. This means that a 5:1 TBR can keep putting power to the wheel with less traction until it has 1/5 or 1/3 the traction of the other wheel and the torque applied does not exceed the traction of the inside tire. If you have less traction available or apply too much power so that you get wheel spin, then the gears inside lose some of their friction against the case. As the speed differential between the wheel speed and the car speed increases on the wheel that is unloaded, internal friction in the limited slip decreases and that tire spins more and more freely. If one wheel comes off the ground and there is no preload, all of the torque goes straight to the lifted tire. As soon as traction is restored, the diff resumes the task of limiting slip.

dch95

http://forums.hybridz.org/topic/1019...ue-bias-ratio/


The page I found it on.

Fakie J Farkerton

iTrader: (51)

sounds like it's broken.