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Originally Posted by porsche986spyder
Well, if you look at what I said earlier, the best of both worlds, Cross-drilled & Slotted would be the best as long as the surfaace area is larger than the stock application rottors. In which most cases, just about any aftermarket performance rottor that you buy to replace the stock ones are usually bigger. Never seen an aftermarket rottor that was the exact same size as the stock one, like someone said earier that would defete the purpose of having them cross-drilled or slotted. :ah:
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the best scenario is a solid or slotted rotor with cooling ducts. better airflow will do more than just slots or holes.
most racing teams avoid drilled rotors anyhow. drilled rotors tend to not handle heat quite as well as solid or slotted rotors. they are more prone to hot spots; this causes the ferrous material to change to austenite, which is harder than the surrounding material. this in turn causes high / low spots on the rotor, ultimately leading to poor surface mating between the pads / rotors. this problem is exacerbated by the ferrous pad material used in most race linings.