4th May 2007, 00:02
M5 Guru (>2000 posts)
Originally Posted by rdm190
Drilled rotors have proven to give no added benifit and IMHO they cause inconsistant pad wear and are more prone to cracking.
Drilled rotors save about 1/4 pound of weight per rotor and they offer slightly better bite than slotted. However, under racing conditions, they do tend to crack sooner than plain or slotted rotors. This is a trade-off most racers are unwilling to make. For this reason, I agree with your conclusion that the next set should be slotted.
I do know a pro race driver who, while running in a very competitive series and laden with lots of "reward weight" as his penalty for winning lots of races, would use drilled rotors for his qualifying laps, then switch to slotted rotors for the actual race. The weight savings was enough to make a difference on the starting grid, but he was unwilling to risk using drilled during the race, lest they fail. I know another team in the same race series who were out of the points and, in desperation, ran drilled for the last couple of races in hopes of getting an edge. They got lucky and had no rotor failures. No points either, though. Oh well.
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