who doesnt love getting new parts?? here r my new rotors all i know is my old ones were done and these r a good upgrade for my new rear. got em off ebay

 

My those are nice with all the grooves & drilled holes.

 

well they look nice couldnt tell you how much they will improve. thought rotors just dissapiated heat so your brake pads last longer. I could be very wrong though hah. how much that cost anyway?

 

on ebay there 125 for all four. and the slots help the pads grip more

 

Yes, the more slots & holes will make the the pads grip a lot more.

 

the slots and holes let the rotor cool quicker. NO reason to have them on a street car other than them looking cool.

If anything, i would think ( dont know for sure..) that they would in fact make you stop slower/worse with the factory calipers. Upgrade the calipers, pads, and rotors. Thats where you will see good upgrades.

 

Oh No not the great rotor debate! One thing that is accepted is that the holes used to allow for gases to escape. Modern brake pads do not have this issue. I have heard argument on both sides good/bad from guys that know way more then me. You can find experts thay say Grooved and slotted do make it better. Some of those guys are engineers for the most exotic sports car in the world.

besides they look cool

 

WELL GO FIND THEM!! Geez Gorn.. lol

Im not really tryin to say one way or another, other than that they do look cooler. The rest is mostly opinion

 

http://www.sae.org/technical/papers/2006-01-0691

I am not paying money for the document. Here is the review of the above doc and a pretty good thread about it.

http://forum.e46fanatics.com/showthread.php?t=500950

Like I said people way smarter then me are still arguing.

 

To put it simply, non drilled/slotted rotors will stop the best the first time you press the brake pedal due to the increased surface area on the rotor, but each consequent tap of the pedal the braking will worsen. Drilled/slotted rotors have a greater chance of staying consistent under extreme use because they are much more efficient at dissipating heat, which is the cause of brake fade.