Drilled Rotors

[TimG427]

Great post, I enjoyed reading all this.

[newBDR]

Me too and now wondering why the suspension upgrade on my BDR included drilled rotors.

[Cashburn]

Originally posted by newBDR


Me too and now wondering why the suspension upgrade on my BDR included drilled rotors.

You have the M3 package, M3 has "ventillated" rotors as stock equipment. Don't want to go against conventional wisdom here but if the factory is putting them on I would give them a little more credence.

[harritg]

Hey guys I bought new Cross drilled rotors to put on my ERA Cobra for better braking. The only problem is cross drilled mid 70s Chevrolet rotors will not work with the knock-off adapters. Opps. If anybody can use these rotors I have about $200 bucks in them and would part with them for $125 plus freight. e-mail me at chrislharris56@msn.com for more info and pictures

[clayfoushee]

I know this is an old thread, but I ran across an interesting post on another website regarding some newly published SAE research on drilled vs. non-drilled rotors.

Just starting receiving SAE papers and got one where some GM engineers test drilled vs. non-drilled rotors for performance. The did not test stopping distances or a slotted rotor. They tested for fade, cooling, and wet braking performance. They referenced the conflicting information you get from brake manufacturers and the internet forums. They did not state the cars but from the descriptions one is a vette with drilled and non-drilled rotors and the other one is a 911. They did simulated street, race track, and dynometer testing. Some of the conclusions will surprise you. Bottom line: Drilled brake rotors do slow a car down better and it is exponential as speed increases. Drilled rotors have less fade. They could not confirm if this is due to out-gassing but it is due to mechanical friction and scrubbing of the pads; and cooling which is also better. They did state that pad and rotor life is twice as short compared to non-drilled rotors. They were not better in the wet.

[Wayne Maybury]

But they completely overlooked the main reason that most people have them. They look really neat.

I doubt that cross drilling will make any difference on street driven cars, 99.9% of the time. It is strictly the "bling" factor that attracts most people. I will stick with my regular rotors.

Wayne