Hey guys,

The question is this. I hear several track guys say slotted and cross drilled rotors are marketing hype, and that with repeated heat cycles, they will only crack. My question is, does the street performance of these type of two piece cross-drilled rotors hold a remarkable advantage over just plain old solid face rotors? I've seen two piece upgrades in the parts section that look and sound cool, but I wonder if it's just the larger diameter that allows for the gains in performance.

Cheers,

JP

 

http://forums.corvetteforum.com/c5-t...neer-test.html

/end of thread

 

Street use or occasional spirited driving, have at it.

 

Most factory racers run slotted-only rotors. Here's what I found a while back:

http://forums.corvetteforum.com/c5-t...ed-rotors.html

 

Now thats funny (sorry)....I am not an expert, but I would think that slotted rotors are a great solution for track and street

 

My only experience is with my C-4...and I drove it hard for over 125,000 miles with slotted and drilled rotors with no adverse effect.

 

I just recently spent 20 minutes explaining to a guy that was just married into my family that drilled and slotted rotors will only decrease your performance over standard full surface rotors for a daily driven only vehicle.

His argument: "Why would they use them in performance cars?"

This was very simple to explain to him. I'll explain it in a less car-illiterate way for sake of explaining it.

Drilled and slotted rotors remove surface area from the rotor. Less rotor surface area means less area the brake pad can bite down on.

Slotting OR drilling the rotors allows for heat to escape. However, you lose surface area in doing either or both.

When performance cars that are actually tracked do this, they don't do both. They do one or the other and usually they go with slotted. However, when they do go with a brake that is either drilled or slotted, they go with a much larger rotor as well as to not lose any surface area.

Drilling and slotting is a performance look, but not meant for performance. Many show cars use drilled and slotted rotors for the look. But if the car is actually going to need heat dissipation to the point that they need to drill or slot, they'll only pick one.


Disclaimer:
I'm not a pro, so this is me explaining to the best of my ability what I've learned from people who track their cars regularly.

 

They will hold up just fine for these types of driving.

 

I have been running drilled and slotted rotors for about 6 years, I'm still on the same set. No cracks, no warps. I drive the car everyday and I drag race it every other weekend. I noticed a difference in brake "bite" on and off the track. It really helps in the rain because it lets the water escape from between the rotor and the pad.