Quote:
Originally Posted by M3SQRD
Issue with kits like these that add fixed calipers with 4 or 6 pistons is that they are paired with OEM sized rotors which typically have insufficient thermal rotor mass for heavy track use. This is compared to a full brake kit that comes with larger and thicker rotors + 4/6 fixed piston calipers with much higher thermal mass capacity.
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The problem with other big brake kits is that the bigger rotors and calipers do not fit behind 18" wheels.
The ones that do fit behind stock 18" wheels have the same size or slightly smaller or larger (+/- 10mm) rotors. For example, Stoptech brakes uses 355x35 rotors (stock is 360x30) with 4/6 piston calipers - nearly the same size and heat capacity as stock rotors. A lot of people run the Stoptech without issues. Freaky brakes is basically the same set up with Brembo calipers.
So if you are looking for a set up for light weight 18" wheels, the stock rotor is as large a rotor that can fit.