I am a student in a FSAE-A team currently doing a thesis on a custom diff build, so far I want to go with a Torsen styled diff. I have spoken to some past members of the comp and they said that the Torsen "FSAE special" was quite popular a number of years ago, yet was phased out by spool and clutch type lsds (particularly the drexler unit). I was wondering if anyone care to share their personal experiences/opinions on why this is the case?

Also any issues anyone found with using the FSAE special would be helpful.