LSD question

Aside from the fact that they work on different principles, what are the practical differences (aside from price) between the ZF and the Quaife limited slip differentials on an early 911 with a 915 transaxle?

95% street, 5% track useage.

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Jack Olsen
1973 911 T sunroof coupe
http://members.rennlist.com/jackolsen/Jalopy.html

The lockup ratios are different. I don't recall the details, but I read a good atricle on this some time back in Pano. You might try talking to racers, they will have some hard data for you.

I did a search of old posts, and there was a discussion about the Quaifes locking up in ways that were more unsettling for street drivers. For track use only, though, Quaifes seemed to be the preferred way to go.

Since I'm looking to put together a street car that will occasionally impress me with its capabilities on the track -- but more often get me to the dog park on Mulholland to watch my dogs run -- the original-style lsd seems a better choice for me.

If I were building a track-purpose car, though, it would be Quaife all the way.

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Jack Olsen
1973 911 T sunroof coupe
http://members.rennlist.com/jackolsen/Jalopy.html

One point about the Quaife's ... they are only available in the 'coarse-spline' version which DOES NOT FIT early 915's. I forget whether it was the '76, or the '78 and later output flanges that the Vasek Polak parts man told me was required to update earlier 915's to the Quaife differentials. They were specifically designed for the sc and later cars, not the earlier cars that needed the LSD worse than the later ones with bigger tires and 'more grip'!

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Warren Hall
1973 911S Targa