Quote:
Originally Posted by calispec
Front brembos off an STI:
4 piston 40mm and 46mm
1/2 piston area = 2918.5 mm^2
Effective diameter = 268mm
Brz OEM calipers front:
2 piston 42.8mm and 42.8mm
piston area = 2877.44 mm^2
Effective diameter = 247mm
If both see the same line pressure the brembos will see 6.74% more stopping [force] (edit: torque) than the OEM calipers.
I didn't bother doing the rears because I knew it was going to be way worse and didn't want to spend the time trying to find the information on them.
With stickier tires you will see more weight transfer because you are stopping faster. Probably somewhere in the 4-7% range. I think it's safe to assume with sticky tires the brembos on the front will work out to be pretty great.
That's what I did. I have a lot of hours on track with them and so far I love it.
Hopefully we can figure out how to put those calculations on the first page so people don't have to sort through 5 pages to get it.
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I would think the Brembo's would see a little more torque than you stated. Only because I would assume the pads would have a higher coefficient of friction than stock pads.
As you did say in a later post, bigger brakes are primarily to dissipate heat, not to improve brake torque. I would be interested if you had taken temperature measurements during track days and also compared wear rates.