Nice upgrade!
I have a question.
Are the larger D3 S8 rotors on the same plane as the D2 rotors? (Do they sit out or in more?)
Also how thick are they?
My thought is to use the D3 S8 rotors, since they are quite a bit larger, and either re-locate the D2 S8 caliper out on a bracket to the right diameter postion, but if the rotor is too thick that would not work. (Unless of course you take apart the calipers and add spacers to them, longer cross over tube for the brake fluid to make them wider...)
Just the larger rotors add more braking ability, since you are further out from the center of rotation. (Sort of like adding a cheater bar on a wrench, it multiplies the tourqe, so the same amount of pressure on the pads via the calipers equals more stopping force is what I've been told.)
The larger swept area just allows it to reject heat faster, or store more heat when used, and reject it over more time. (Reducing fade effects.)
So, in theory, just going to larger rotors would add to the braking ability of any vehicle, and the S8 Brembo's are pretty good calipers to start with, they just should have been mounted over larger/thicker rotors.
