Originally Posted by 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.

Originally Posted by mark anderson

Guys this is pretty straight forward. My trans guy has been doing this for years for us and a few other customers. As I told Carl you just need to offset the carrier with shims. Hopefully Carl can make these and offer them to everyone to make this simpler. The 78-82 LSD is better and easier to come by.

Originally Posted by Carl Fausett

First, we took the two LSD's (early and late) to a CMM machine to measure to the ten thousandth of an inch the location of the ring gears relative to the bearings. Then we swapped the ring gear over to the diff and measured again.

This let us know precisely what we had to make up in shims and in which directions.

Upon installation, we checked ring and pinion backlash agian and found it was spot-on at the Porsche spec.

We also used Prussian Blue to check the smear pattern on the gear teeth, and it was also spot-on.

But finally, we mounted it in the car and went and ran seven 30-minute race sessions with it. We were testing the LSD and also our brand-new solid transaxle mounts (photo below).

Both perfromed flawlessly. The serial port on my accelerometer is not working right, and although it recorded the sessions, we have been unable to get the files off of it. We will. And I am sure the traction circles they produce will show clearly the lateral and acceleration forces were improved by the improved limited slip.

Before everybody gets all excited about solid transaxle mounts - they are for cars equipped with rollcages only. There is twist in the unibody, and a solid mounted transaxle would be a mistake when the body is permitted to twist.
However, if rollcaged, the cage has augmented the unibody and will have eliminated the need for rubber mountings so the transaxle can float. I was surprised at how much the solid transaxle mounts improved the shifting accuracy and speed. More on that product later.