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Some more data:
Seems like Z4 3.0si uses parts from BOTH 325i and 330i.
3.0si: Rear rotor 294x19, Rear piston size 40mm (from 325i)
3.0si: Front rotor 325x25, Front piston size 57mm (from 330i)
Z4M: Rear rotor 328x20, Rear piston size 44mm (from E46M3)
Z4M: Front rotor 345x28, Front piston size 60mm (from E46M3)
E92-335i: Front piston size 57mm
What I don't know is how the brake bias percentages is set from the master cylinder/portioning system, and the pad size on the 335i caliper vs. the original 3.0si caliper.
My fronts are now 345x28, Front piston size 57mm (from 335i, even though caliper is larger than Z4M, piston size is the same as Z4 3.0si)
I'm working on adapting the Z4M rear rotor by creating a custom caliper bracket and modifying the shoes. Being that the piston sizes are not changing from the original Z4 3.0si setup, I don't think my bias will be changed by much by moving up to larger diameter rotors, although I understand clamping force will increase.
Front went from 325mm to 345mm (10mm radius increase), while the rear will go from 294mm to 328, or 17mm increase. I'm sure this will increase rear bias by some amount, but it's possible it is being offset by the larger front brake pad.
I'll update this thread once I get the fabrication done.
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