What's a good way to check a diff?

[Jaxx_]

And to clarify the torque wrench should be measuring the torque at the axle nut and not a lug nut right?

yes. 30mm.


I am running 75-140LS mobil 1.

[LJ851]

I would think so. If you do it on a lug nut, then you are adding leverage. So 56 could possibly be 60+

No necessarily, if the torque wrench is at 90 degrees to a radial line that goes from the center of rotation to head of the wrench it will torque accurately (1 to 1)

[Mr.SWISS]

So I guess it's fairly safe to assume my diff is a goner then.

[b*saint]

No necessarily, if the torque wrench is at 90 degrees to a radial line that goes from the center of rotation to head of the wrench it will torque accurately (1 to 1)

How is this possibly on a polar array of lug nuts?

[LJ851]

How is this possibly on a polar array of lug nuts?

Pick a lug nut. It doesn't matter which one. Imagine a straight line originating at the center of what you are checking torque on (the center of the axle in this case). Imagine that line going straight through the center of the lug nut you chose.Put your torque wrench on that lug nut and as long as it is perpendicular (at 90 degrees) to that imaginary line it will read torque accurately.

[samiam3356]

Was suprised at the number. Probably going to get Dom to come over check it on his as well. This was done on a lug nut as my 30mm was at work for some reason.

It has fresh Bimmerworld Clutches and I rebuilt it myself. Went out and did 10-15 left and right hand turns and 10-12 figures eights to help break it in before getting on it at all. Like said before it locks good and smooth. With the s52 its not hard to break it loose.

[Jaxx_]

how should they perform with the diff up to temperature? more lockup? less lockup? much much of a difference?

[Wanganstyle]

how should they perform with the diff up to temperature? more lockup? less lockup? much much of a difference?

the factory LSD has a wide temp range. the e36 units actually had large windows cut in the capsule to allow for more oiling (to keep things cooler while heavy tracking etc)

if you really overtemp it the clutch discs can melt down/smear / loose the splines to spiders.

OEM organic clutch material is pretty good while cold. The aftermarket japanese LSD's have plates that don't wake up untill hot.

[e30orDie]

Interesting.... I'll have to check mine out...

It'll be fun to see how much damage I've cause in my rear end from
Drifting- Even though I don't have a start figure to go by- I think it'll still give me
A retrospect of how well it's held up from 15lbs of beast.

[Mr.SWISS]

So if the clutches are allowing slip will that translate into a grinding noise?

[Wanganstyle]

So if the clutches are allowing slip will that translate into a grinding noise?

if clutches are slipping the LSD wont lock. Car drives like open diff. This happens to e36M track cars that simply wear the dog plates thin - differential will still work like open diff, LSD wont lock. free spinning.

if you overheat it to the most extreme with massive shockloads (drifting) it can do something like THIS

[Jaxx_]

So if the clutches are allowing slip will that translate into a grinding noise?

when you exert torque on it and it starts slipping it will sound like grinding.

[samiam3356]

mine didn't make too much noise

[Mr.SWISS]

Ok now I'm really trippin. All three 325is cars are testing pretty much the same with the car in question having the least resistance.

I pinpointed the noise to the pass side rear tire and am going to yank the rotor and see if the parking brake is jacked somehow. I'm close to swappin the whole rear subframe with the swap car project and 5 speed swapping it. Surely that will take care of the problem.......

[Jaxx_]

you shouldn't have the noise in a straight line, but I do hear the clutches grinding when doing sharp turns in a parking lot.