Originally Posted by Lsvtec503
The improvement comes during heavy off and on braking over a extended period of time like you would encounter if you were racing on a road course. Slotted/cross drilled just help keep the brake pads/rotors cool.
Wrong wrong wrong wrong...
Cross-Drilling was never done for cooling it was done to allow gasses from brake pads back in the day a place to escape, slotting is used to keep the pad face clean. Most road racers do not use cross-drilled unless they are running very large wheels due to series rules and run extra large brake rotors, they will then cross drill them for weight savings. I would use cross-drilled rotors on the street before I ever used them on track, since they have a higher likelihood of failure due to the material removed when drilled.
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http://www.teamscr.com/rotors.html