964 LSD
05-30-2012, 12:57 PM
#1
Pro
Thread Starter
964 LSD
I bought a G50 limited slip diff from fstockcarrera during his going out of 964 Cup business sale. Bob mentioned that the unit is the "Two Plate" unit, not the "good 4 plate diff".
I am think about having my shop drop in the diff, while inspecting / or rebuiling my 103 k miles tranny. The tranny shifts well, third gear has a little clunk (mostly while cold), but it hasn't changed in the 20k miles that I have owned/tracked it.
I can get the serial numbers off of the diff later when I am home, but will appreciate any P-Car diff enlightenment that i can get.
Thanks
I am think about having my shop drop in the diff, while inspecting / or rebuiling my 103 k miles tranny. The tranny shifts well, third gear has a little clunk (mostly while cold), but it hasn't changed in the 20k miles that I have owned/tracked it.
I can get the serial numbers off of the diff later when I am home, but will appreciate any P-Car diff enlightenment that i can get.
Thanks
06-14-2012, 10:29 AM
#3
Pro
Thread Starter
Thanks Steve
I have a hard time conceptualizing differentials. Do the extra plates add stout, or are they a design factor to increase variability of allowable slip, or is it some other factor that I don't yet understand?
06-14-2012, 10:55 AM
#4
Here's what he has said in the past
The problem with these old ZF G50 LSDs is that Porsche designed them as a 2 plate diff to start with. For us to rebuild it to 4 plates requires that we use our thin little 1mm friction discs to make it fit, which is where the wear issues come into play. Our standard friction discs, are 2.1mm and have significantly more depth to the friction material, which is something that is added to the steel plates and then heat treated. So in this instance, it's really the thickness of the material, more than the number of friction surfaces that makes for accelerated wear.
As such, I only recommend converting these 2 plate LSDs over to 4 plates when the vehicle is being raced and is looking to maximize the performance out of the LSD. Otherwise for a street car that sees some occasional track duty, I really feel that just rebuilding it to the stock 2 plate configuration with the thicker standard plates is usually the best approach, both with respect to durability and day to day driveability.
Regards,
Matt Monson
Guard Transmission LLC
As such, I only recommend converting these 2 plate LSDs over to 4 plates when the vehicle is being raced and is looking to maximize the performance out of the LSD. Otherwise for a street car that sees some occasional track duty, I really feel that just rebuilding it to the stock 2 plate configuration with the thicker standard plates is usually the best approach, both with respect to durability and day to day driveability.
Regards,
Matt Monson
Guard Transmission LLC
06-14-2012, 11:30 AM
#6
Rennlist Member
06-14-2012, 12:10 PM
#7
Nordschleife Master
Alan, I cannot remember if Bob's LSD is currently a 40/40 or the 20/100. We found the 40/40 street differential was better than the RS's 20/100 lockup. You'll want to put the better plates in the diff.
