Drilled/slotted rotors
DO NOT outperform blanks. Period.
I own/operate an SCCA Improved Touring E-class Mustang. This car will repeatedly stop itself from 165-170 mph every lap at Firebird main course (about once every one and a quarter minutes) The brake setup is as follows:
Cobra calipers (yes, the crappy PBR ones)
Very solid brake ducting
Very good (expensive) DOT 4 fluid
Hawk Blacks or SBC race pads
...drumroll...
and Brembo blanks.
The outgassing mentioned in this thread is not a problem with modern brake pads. Drilling/slotting rotors does the following:
1. Decreases the overall mass of the rotor, thereby reducing its ability to absorb/dissipate heat.
2. Increases pad wear by the holes/slots digging into the pad
3. TREMENDOUSLY increases the chance for the rotor to crack
4. Disrupts the natural strength of the casting because there are now additional stress risers.
If any of you spend any time at a road course, you'll notice that even on uber-racecars, blanks outnumber drilled/slotted by probably ten to one. The only people that have drilled/slotted rotors are (especially) the Porsche guys because those holes are actually cast into the rotor.
If anyone of you don't believe me, feel free to view this thread:
http://corner-carvers.com/altimathread.php.html
This is the 'infamous' thread saved for posterity by corner-carvers forums all about this subject. The folks at
www.corner-carvers.com are, IMHO, one of the best no BS locations for hardcore tech on the internet.
With that said, I have drilled/slotted rotors on my silver mustang. Why? Because they look cool.
Paul.