BWR's Custom Tuning Spec of the OS Giken Differential. After hundreds of hours of testing and driving, we've designed the ULTIMATE differential to maximize corner exit grip without sacrificing corner entry handling or transitional response.  There is no diff that will put down power coming out of a corner than this one.  8 SCCA Solo Titles and the only Lotus to Win an Optima Ultimate Streetcar event both had this differential!  You can only get this setup from BWR!

• The BWR spec takes advantage of the full-lockup capability of the OS Giken, but with custom ramp angles and pre-load in the Belleville washers but also in the center ring spring tension. The final result is purely for Lotus. Maximum grip on corner exit under acceleration but none of the ill-handling delay in unlock under corner entry that is the common trade-off with Clutch-type differentials.
  

A Torque sensing differential such as a Quaife is great on corner entry as it behaves essentially as an open diff, the downsides of a Torque-sensing Diff are 2 fold:  1.  They do not achieve 100% lockup.  2.  They lose all drive when one wheel loses traction on a bump or slippery surface.  The Quaife is a great diff and gives a driver 75% of the benefit of a limited slip differential.  The OS Giken gives the full 100%.  

Typical Clutch-pack differentials give better lockup AND have drive force when one wheel is unloaded.  However only the BWR-Spec OS Giken with its large numbers of friction plates and proprietary center-ring technology provides 100% lockup with Open-Diff corner entry and transitional characteristics.