LSD

Does any one have experience with factory LSD's and Quaifes? I've heard that if you "grew up" on the factory unit that is all you want.But for some one unfamiliar with the factory unit it may seem harsh comming in with a bang where as the Quaife is relativly seamless working behind the scenes. What kind of experience is out there?

Bruce

What I grew up around was a lot of 'bench racing' discussions about Detroit Locker vs. Mopar Sure-Grips ... and a lot of guys complaining about odd noises emitted from the Detroit Locker rear ends ... the Mopar guys were too busy grinning like Chesshire Cats to do much complaining! The ZF unit and the Sure-Grip exploded diagrams look more alike than different, to me, so I think I will stick with what won all of those races in the RSRs! If you need an excellent manual for your 901 transaxle, including all of the available gears and detailed procedures for the ZF differential, get a copy of Clymer's 'Porsche 912 Handbook and Service Manual' ... Performance Products carries it!

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Warren Hall
1973 911S Targa

It seems that the "factory" limited slips have less lockup than the Quaife unit. I have the Quaife in both our 1987 Turbo and my 914 race car and in both cases the car had better be pointed exactly where you want to go when you apply full power of you'll get a wild ride! The best unit is the unit made in Hawaii by Guard (sp ?) but they are a little more expensive than the others. The factory units seem to be harder to find and last fall when I was looking for one I found they were about as expensive as a Quaife and did not have nearly as good warrenty so I bought a Quaife. Good luck.

[This message has been edited by john rogers (edited 04-07-2000).]

I have an '85 with the factory LSD and its action is almost entirely seemless. I only notice it on low speed, tight coners in the dry where it causes the rear tires to "scrabble" a bit. I have never experienced any "bangs" or other intrusive traits with the factory unit, just lots of traction. I have no experience with the Quaif.

Thanks for the replys. I was wondering if the latter model LSD's are the same basic design as the earlier design.

Bruce

If you mean, are they all ZF, multiple-clutch disk designs, that is my understanding, including all of the 930 models! There are some differences in the percentage-setting options over the years, but that is the only change I am aware of, other than the later coarse/fine (early) spline output flanges.

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Warren Hall
1973 911S Targa

It also depends on which tranny you mean. I believe that the factory units for the 915 were all essentially the same, but the factory started using an asymmetrical LSD in some G50 trannys. The asymmetrical LSD locks up more under deceleration (80%) than under acceleration (20%). This was done to reduce lift throttle oversteer. Hope this helps.