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Hello Driftflo,
Thank you for sharing your vast BMW differential experience with the forum. I have enjoyed reading your post and viewing the images of differential guts.
I am writing to inquire about ATBs. I am less interested in tracking/drifting my car and when my OEM lsd is toast I would like to upgrade to an ATB style unit which will perform consistently and longer than a clutch style LSD before requiring service.
Throughout your post you have stated that an ATB does not suit your needs. Primarily this seems to be because it behaves like an open differential while decelerating or upon lifting the gas. I can appreciate your racing requirements and respect that you want a different level of performance than me or most drivers who primarily operate their M3 as a street car and attend track events on occasion.
I have operated Quaife units in my 1976 turbocharged 2002 and 325 touring for many years and found the Quaife to offer a tremendous improvement in rear axle feel while accelerating and powering through curves.
You definitely have a lot of experience and I would like to request your opinion. What do you think is the best performing ATB on the market?
You mentioned the Torsen, Wavetrac and Quaife offering a slight upgrade in performance to the stock LSD. Of the non-clutch style ATB units available for the e92 M3, which would you recommend?
Because of my positive past experience with Quaife I was leaning that direction for my M3 but would like to know which ATB unit you feel offers the best performance and value.
Thanks in advance for any insight which can share.
Kurt
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