By chance I snagged a set of almost new OEM Comp Front Rotors (retail $450+) on Offerup for $150 because the seller didn't know they were competition spec. Originally was just going to flip them, but after discovering ECS sells a front caliper bracket adapter for $150 I'm no longer sure what to do. I could upgrade the fronts for $300 said and done, but I had a few questions:
1. Would installing only front ZCP rotors result in worse braking performance due to brake bias changes?
My car is a 2002 with DSC3 and the stock brake bias is listed at 1.27:1 (56%F, 44%R). Switching to ZCP fronts and keeping OEM rears on a DSC3 would put me at 1.37:1 (57.8%F, 42.2%R). This brings me right in line with the brake bias on ZCP equipped cars with MK60 which is listed as 1.38:1 (58%F, 42%R), which I'm assuming is what I should be aiming for. If I were to also acquire ZCP rear calipers, this would put me at 1.14:1 (53.3%F, 46.7%R), which seems to throw me quite far off from both my original brake bias, and the brake bias on ZCP cars and is why I'm assuming I don't need the rears.
2. Additionally, does this upgrade make a noticeable difference over stock or is it not really worthwhile?
Chart referenced: https://thebuildjournal.com/tech-gui...-chart-e46-m3/
Oddly enough, I'm not sure why this chart shoes different percentages, but maybe things have been recalculated since the time when the original chart was created? https://thebuildjournal.com/shop/bmw...it-kit-e46-m3/
1. Would installing only front ZCP rotors result in worse braking performance due to brake bias changes?
My car is a 2002 with DSC3 and the stock brake bias is listed at 1.27:1 (56%F, 44%R). Switching to ZCP fronts and keeping OEM rears on a DSC3 would put me at 1.37:1 (57.8%F, 42.2%R). This brings me right in line with the brake bias on ZCP equipped cars with MK60 which is listed as 1.38:1 (58%F, 42%R), which I'm assuming is what I should be aiming for. If I were to also acquire ZCP rear calipers, this would put me at 1.14:1 (53.3%F, 46.7%R), which seems to throw me quite far off from both my original brake bias, and the brake bias on ZCP cars and is why I'm assuming I don't need the rears.
2. Additionally, does this upgrade make a noticeable difference over stock or is it not really worthwhile?
Chart referenced: https://thebuildjournal.com/tech-gui...-chart-e46-m3/
Oddly enough, I'm not sure why this chart shoes different percentages, but maybe things have been recalculated since the time when the original chart was created? https://thebuildjournal.com/shop/bmw...it-kit-e46-m3/
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