RE: E58 LSD's - Definitive way to determine if LSD or not?

[PooJou]

Hey guys,
I had a search through the forums and all already - but I'm going to look at a E58 + LSD and was wondering if there is a DEFINITIVE way to know if it is LSD or not?

Also, the shafts aren't attached to the box if that helps.

Oh and is there a way to test whether the LSD is munched without installing it into a car?

Cheers

[30psi 4agte]

You can tell a LSD by jacking up the car and turning the wheels by hand.
If you turn the wheel forward and the opposite wheel turns forward as well its a LSD.

If you turn the wheel forward and the opposite wheel turns the other way ( backward ) then it is open wheel.

[brett_celicacoupe]

You can tell a LSD by jacking up the car and turning the wheels by hand.
If you turn the wheel forward and the opposite wheel turns forward as well its a LSD.

If you turn the wheel forward and the opposite wheel turns the other way ( backward ) then it is open wheel.

some older LSDs will be too 'loose' to behave like this. so you could argue that the only definitive way to identify a LSD is to look at the centre itself.

and this method also wont tell you if it is a mechanical LSD.

[30psi 4agte]

If the car is jacked up and there is no load on the wheels even a stuffed LSD should have enough tension to spin both wheels as it is the crown wheel driving the basket / axles

+ a open wheeler always turns the other way so you can decipher between the two.

[Ben Wilson]

Just pull the speedo drive out and have a look inside. You can see the diff easily through the hole.

[Kyosho]

Sounds like the diff isn't in the car?

[CLG]

With the smaller C series boxes, you can actually see daylight through the diff centre for an open centre assembly, but not with an LSD unit - I'm not sure if this is the same for E series boxes, and all mine are packed away in a shed, so not easily acessable. I too think the original question relates to an assembly out of the car, so you can actually feel the spline housing for the driveshafts, while you have a second person turn the input shaft of the box - make sure the box is "in gear" for this test, to determine "axle rotations.

[PooJou]

Yeah guys, sorry if I wasn't clear, the gearbox is OUTSIDE of the car - I was hoping someone on here has SOME experience with the Factory Option E58 LSD's (Viscous if I'm not mistaken) but it seems that their rarity means... well... lol

[motormad]

As far as i know there is no crosspin in lsd diffs, ie with no driveshafts in you have an unobstructed view right through the centre of the diff. A non lsd diff needs sun and planet wheels, hence the crosspin.

[Ben Wilson]

Just pull the speedo drive out and have a look inside. You can see the diff easily through the hole.

^ Have you tried this?

[PooJou]

^ Have you tried this?

No i haven't, I haven't seen the gearbox as of yet - would this be... difficult to do? (I don't personally know much about gearboxes )

[Joshstix]

It will have a cros bar through the guts if it's a stock LSD. My E153 has a viscous LSD and will act like an open centre when simply turning one wheel with the car jacked up but once there is a decent torque load it will spin up both wheels properly.

[PooJou]

It will have a cros bar through the guts if it's a stock LSD. My E153 has a viscous LSD and will act like an open centre when simply turning one wheel with the car jacked up but once there is a decent torque load it will spin up both wheels properly.

So there should be no light visible if i look through the box where the shafts go?

[Joshstix]

If it is a stock open centre there will be a round hole through the middle of the diff, if it is a stock LSD then there will be a bar across the middle of the diff centre.

[motormad]

I dont want to disagree with anyone here, but i have 3 Honda, 1 Escort, 3 Toyota fwd transmissions kicking around my workshop and they all have crosspins except one which is a JDM Starlet turbo lsd box. With no driveshafts in you can clearly see right through the diff.