Originally Posted by heeman10
Ello
Sorry I never had the chance to stop and chat etc at the show! Looks like those 20 minutes have changed your life/car (same thing
)! I would suggest buying grooved discs or having yours grooved, it makes an enormous difference in my experience. I swapped from XR2i calipers and grooved 249mm discs to Wilwood 4 pots and 285mm smooth discs, and the jump in performance should've been much much bigger. The discs are extremely glazed, as are the pads, and I'm sure it's down to the smooth surface rather than the grooved face that helps keep things that bit rougher. Rally Design refused to groove them for me at the time of buying, but I'm looking to get someone to do them for me before too long, I know they'll sharpen up.
Lightly grooved discs would reduce the glazing, but so would a higher heat rating pad, the grooves would also increase the wear rate of the pad. But from the motorsport discs ive seen glazing (as long as it is distributed around the disc evenly) is no bad thing, you'll always get pick-up when the pad reaches high opperating temps. Its cracks in the disc that are a problem! And 'cutting' grooves (unless radiused shallow channels) will increase the disc's suscepability to cracking with heat cycles.