I thought I had but , I do not have a LSD( that is another story).SO , I am looking into obtaining a LSD for my E39 540i.I see the new Wavetrac LSD but , today I talked to the person who built my engine and he said go with a Ramp Style LSD... I have never seen what he is talking about , I do not believe, has anyone in the racing area of BMWs seen such ?? Just thought I would ask....

 

He is referring to the more traditional LSD design that uses some form of plates or ramps, as opposed to the Wavetrac which, I think, is a torque bias style, or TBD. Guard Transmission makes both (and very good ones), and might be a good source of general information. Each has its advantages and limitations, and it all depends on your intended use and expectations. For track use, the plate type is more flexible, allowing for different lockup levels and, maybe more important, offers lockup on deceleration too, which helps in controlled braking. If you lift one rear wheel with a TBD, you loose all inside traction, just as in an open axle. But, the TBD is virtually maintenance free, and would probably never need rebuilding. As a generalization, IMO if your use is street and light track, the TBD would be fine.

 

Thank you......