Quote:
Originally Posted by Captain Caveman
E92 M3 calipers
Stock M3 piston area front 60mm - 2826 x 2
Stock M3 piston area rear 46mm - 1661 x 2
Stock M3 total area 4487
Stock front bias 63%
M4 calipers
F8X M3/M4 front BB-43 (40/40x30mm) - 2512 x 2
F8X M3/M4 rear BB-22 (44x24mm) - 1520 x 2
Total 4032 - 10% firmer - Stock bias 62%
Definitely not poo-pooing this setup, especially as I haven't tried it, but wanted to be transparent with my findings so that ppl can make an informed decision.
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Looks like those numbers match what was posted earlier in this thread, brake bias is within 1%. Perhaps it is the slightly more rear bias, or it could be the fixed calipers, but high speed braking is improved and much more stable than stock brakes when heavy braking from high speeds.
Quote:
Originally Posted by Captain Caveman
10% smaller total piston area than the E92 M3, which means a 10% firmer pedal with 10% less modulation, and 10% less torque at the piston.
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I am no expert in the math, can't really say I understand it. But how come only the area of two pistons are used for the front caliper? When there is 4 pistons, and torque being applied from both sides vs 1 side on the stock caliper.
Shouldn't that have an effect on torque applied, since it is from both sides? It certainly doesn't feel like less torque is being applied to braking. Either way I am very happy with the upgrade especially at the prices I paid, as the prices on these parts have taken a jump recently, probably due to increased demand.