The Z4M is tricky when it comes to getting the most out of it in terms of front grip but the recipie I had some success with was pretty much what everyone else has said; -2 degrees or more of camber and some real tires. I ran it stock for a few events on 225/45 Hankook V12's and it was miserable. I eventually moved to a full Ground Control suspension and 245/40 RE71R's which made a huge improvement. I'm now autocrossing my E90 M3 in FS full time but if I decide to go back to the Z4M I'll probbaly try to fit the 265/35 fronts for my M3 in the front of the Z4M. I imagine that will be the ticket.
It's not an easy car to get the most out of but damn it's fun.
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