Math for determining needed brake size

[johnparts]

Vacuum assist is going to require vacuum...do you have that with your HP numbers?



As for running the numbers, it's mostly a function of the kinetic energy (KE) that your brakes may potentially need to dissipate. KE = (1/2)mv^2 where m = mass and v = velocity. While mass certainly plays a roll in the equation, velocity tends to be the controlling variable given that it is squared. Regardless of how much HP you have, the level of braking capacity that your car requires is a function of the how the car is to be driven. Given 750 RWHP, pushed to the limits, you'll need every bit of brake you can afford and possibly then some if you've got the tires to handle that much power. If you only cruise it to the grocery store, then it's a different story. Calculations only get you so far, at some point you need to actually test the brakes in the envinronment they're being used, so looking at other applications given their weights and speed potentials can tell you a lot about what works and what doesn't.

Tobin
KORE3

Shooting for mild track use. HP band will be very linear with the turbo set-up so there will be the potential of 750 RWHP when I crank the pedal but for the most part I will save my spirited driving for the track. I want this car to be very driver friendly and go long distances with it which is why if I can save money on one area and invest it somewhere else like say other safety equipment I really would like to try. I know with a 20" wheel a 13" brake is going to look silly but hey I might me able to upgrade later however I want what I need for brakes not what I want for brakes. I would run a 16"/14" combo if the budget allowed it.