Drill & Slotted Brake Rotors

[OU812]

Cross-Drilled / Slotted Rotors

The second thing you can do to improve your brake performance is often to go to a larger rotor. We all know that this gives the rotor further ability to dissipate heat away from the pads through itself and through the air (conductive and convective heat transfer). So obviously a larger pad, a larger rotor, or both result in better brake performance by avoiding brake fade.

But what about cross drilled or slotted rotors? Well the common belief in the main stream is that somehow slotted or cross-drilled rotors allow for better performance by handling heat. This is 100 percent false. The individuals involved in such fallacies mention that air through the holes or slots work to cool the rotor (convective heat transfer into the air from the rotor). The issue is that from physics we know that metal transfers heat better then air by a significant amount. As such the larger mass of the rotor becomes more important then the larger surface area of the rotor in any situation other then the optimal. Cross drilling and slotting rotors are not optimal manners of creating metal to air transfer through larger surface areas. There is not much airflow through the holes or slots. Furthermore for cross drilling the holes will fill with brake dust in effect lowering the cooling ability of the rotors vanes they pass through.

Source

[Cesardajr]

Just go with powerslot slotted rotors and ebc green stuff 7000 series brake pads. you will get a better bite on the brakes over the factory set up.
i also upgraded the brake lines and got a nice firm stiff brake feel.

[OU812]

Originally Posted by Cesardajr

Just go with powerslot slotted rotors and ebc green stuff 7000 series brake pads.

What made you choose British-made brakes for your ride? Have you find that EBC--while quiet--wear quickly?

[tomp]

Originally Posted by OU812

Cross-Drilled / Slotted Rotors

The second thing you can do to improve your brake performance is often to go to a larger rotor. We all know that this gives the rotor further ability to dissipate heat away from the pads through itself and through the air (conductive and convective heat transfer). So obviously a larger pad, a larger rotor, or both result in better brake performance by avoiding brake fade.

But what about cross drilled or slotted rotors? Well the common belief in the main stream is that somehow slotted or cross-drilled rotors allow for better performance by handling heat. This is 100 percent false. The individuals involved in such fallacies mention that air through the holes or slots work to cool the rotor (convective heat transfer into the air from the rotor). The issue is that from physics we know that metal transfers heat better then air by a significant amount. As such the larger mass of the rotor becomes more important then the larger surface area of the rotor in any situation other then the optimal. Cross drilling and slotting rotors are not optimal manners of creating metal to air transfer through larger surface areas. There is not much airflow through the holes or slots. Furthermore for cross drilling the holes will fill with brake dust in effect lowering the cooling ability of the rotors vanes they pass through.

Source

This sounds like a brake company trying to sell their big brake upgrade kit! Everone else in the industry has shown that drilled rotors dont do crap, but the slotted rotors do aid in cooling by removing excess gas from between pad and rotor.

[Dan D 2]

If you want better braking, go with stainless steel brake lines....much better bang for your buck

[Cesardajr]

i have used ebc brake pads on a few cars now and they always seem to last at least 2 1/2 to 3 years based on my driving habits and miles of 15k per year. the combo of rotors and pads that i use, gives an immediate improvement over stock, when i added the stainless steel brake lines it only made it better. i know i have all the braking power that i needed.

[TXSUT]

There are some people that believe drilled rotors are just a carry-over from motorcycles, where it does indeed provide an advantage...not in braking performance, but in reducing unsprung weight and rotational mass.