John Veninger

Here is what 500+ ft-lbs, 335 Hoosiers and a hairpin turn does to an LSD unit.


Shaft welded itself to the housing. Had to drill and grind to get it out of the case


Anyone think I can use JB Weld to fix??

Giovanni

No but I will buy from you. PM sent, lol.

BC

As I suspected John, when you originally mentioned this, you lost it at the middle chamfered shafts.

Its all available in separate parts, but the question is how good of an idea is it to buy pieces instead of another LSD, and for that matter, how good of an idea is it to buy a used LSD with 50-180k of wear on the metal pieces instead of something newer?

Thats amazing.

If I am wrong, and it originated with the side mushroom shafts, then that means something I do not understand right now.

Garth S

.. this one's gonna take at least two tubes of JB .....

Rick Carter

WOW

tdelarm

Speed kills mannnn...

John Veninger

The center shaft might have failed. Difficult to determine exactly what went.
I decided to press out the shaft that was frozen just for fun. It took almost all my 12 ton press could give to get it out!
The shaft just welded itself to the housing.

I have another LSD that I'm going to have the shaft and gears cryo treated and adding an additional friction discs.

Imo000

Well at least the ring gear didn't fail.

heinrich

Quaife time.

John Veninger

I would have been hosed if the ring went. This is a very rare 2.64.

Been told that friction disc units are better than torque-biased units for track duty.
Quaife doesn't make a unit for a 928.

heinrich

But it would last forever. Yes I know they don't but I think they could be persuaded. They do produce a 968 unit....

martin D

Interesting, looking at PET the 968 limited slip diff.( a 950 P/N, so a 911 diff ?) uses nearly all 928 diff. internal parts. So maybe only case outer dimensions are different which would not be difficult/ cost much to change when being made.
The 968 Quaife diff. is £788 GBP (+17.5% tax for us in the UK) = $1536 as are the 944, 911 etc. , so I'm guessing a 928 diff. would be the same . Still a lot of money in any currency.

Martin

Vilhuer

911 diff is too small and thus Quaife will not fit either. They need multible unit order before they want to do 928 version and cost is still about double what they are asking for stock items like 968 diff.

BC

The design is so simple, and long wearing, I think that making one that operates the same but that is stronger would be doable.

The shafts break, and the smaller dif gears crack spirally.

marton

I think you could fix it with just duct tape

Marton
interesting collection of bits, as you said you have another LSD so it is not so bad but where would you strengthen it to avoid the same problem?
treating the surfaces would help as you propose.
maybe add some extra cooling??