I donīt know if my clutch type s4 gxl lsd is worn.
When I jack up the rear wheels of the car and I spin the wheel slowly and the other spin in the same direction also. But when I spin it fast from a dead stop the other with spin slightly, not at the same speed. Is this a sign of a worn LSD? How can I know by other method if my lsd is worn?

Thanks a lot

 

Stock turbo clutch-type LSD's are all worn at around 30k - 50k miles.
Yours is probably done too.


-Ted

 

At newest, it's 20 years old, so yes, it'll be due for a rebuild.

 

Thanks for the raplies.
I have also tried to engage the first gear with both wheels in the air and tried to stop one of them with gloves when idling, it was hard by I finally stopped it, it also seems to want to run making some force...

Anyway, is there any method to check if it is actually worn?

Cheers

 

Take it apart and measure the disks with a caliper.

 

Raise rear end.
Make sure one wheel doesn't turn.
Use a torque wrench on the other wheel and see how much torque it takes to make it spin.


-Ted

 

What kind of tourqe figures are we looking for?

And i assume just put the tourqe wrench on one of the lug nuts?

 

Thanks a lot one more time Ted, I was thinking about it but I wasnīt able to find the torque that the preload has to be (sorry for the grammar..). I think the wrench must show a little bigger torque because of the difference in radius from the wheel nut to the center. Does anybody know the torque specs? Cheers

 

Put the torque wrench on the axle nut.

 

drive on gravel with wheel and pavement with the other....... do a good burnout and see if the pavement has a nice equal patch of rubber with the mess in the gravel. Thats a real test, tourque specs will be ok for testing but actually seeing how it performs is more important.

 

not sure for rx7's in particular, but I've check the specs on other clutch type lsd's and it's usally in the range of 40-60 ft/lbs. Just measure yours, if it's 10 or 20 ft/lb you know it's worn. I believe you can use a shim for a temporary fix.

 

Thanks for the replies. Finally I am going with Torsen because it will race on autocross and I think it will be better.

I will use the same gear ratio, do you know if I must set any preload? I supose that it is not necessary because it will be the same gearing but I think I have read something about it. Thanks

Regards