Slotted rotors....yay or nay????

[OrangeCrush 86]

Nay

[PHRANQUY]

Nay.

[mnstang]

Also, even if it is just for looks. why would you want to draw more attention to tiny dinky little undersized rotors? it would be like polishing your stock length antenna.
if anything you should order some dust shields with your 03 cobras so you can't see the brakes.

[J-Rod]

Yea, lets look at NASCAR for performance clues............lets all remove our ABS systems. All real performance race cars run carburators, right? Good idea.

Guys,
The job of a rotor in a braking system where performance is of utmost impotance is to wick heat away from the calipers. The rotor is a heat sink, it stores the heat until it can me dissapated. The more the mass, the more ability it has to hold this heat. So, given the 13" rotor that most of us have on our Mustangs, removing mass (by drilling the rotors) only defeats the purpose.(everything else equal)

That does not mean that Drilled rotors can't be used on our cars for an extreme performance application. For instance, if you increase the diameter of the rotors to 14"..........or decrease the weight of the car dramatically, you might be able to get away with the reduced mass that a drilled rotor will give you, as long as you are not removing more mass than is needed to control the heat that is being generated.

I invite any of you doubters to come to a race track, and show me a Mustang that is running drilled rotors. Drilled rotors are alot like many of the "performance" items I see mentioned in here, they are judged by how fancy the add is in thier favorite magazine or by some idiot on the net that has no idea what a true performance setup really is.

Brian

Good and accurate information but lets not forget the leverage factor of the larger rotor. Kinda like using a breaker bar compared to a ratchet. Not a great difference in this case but all factors together make the difference. I also agree that the drilling and slots ane not an advantage. I dont watch it and would like to rip on nascar also but I have RESPECT for their machines, what they do, and what they are capable of. Last I heard they are required to restrict their power output and if you ran any of our cars at 8000 rpm and 200 or whatever mph for the legnth of time that they do I don't think that there would be much left.

[bad-speller]

Good and accurate information but lets not forget the leverage factor of the larger rotor. Kinda like using a breaker bar compared to a ratchet. Not a great difference in this case but all factors together make the difference. I also agree that the drilling and slots ane not an advantage. I dont watch it and would like to rip on nascar also but I have RESPECT for their machines, what they do, and what they are capable of. Last I heard they are required to restrict their power output and if you ran any of our cars at 8000 rpm and 200 or whatever mph for the legnth of time that they do I don't think that there would be much left.

Your right, the leverage on a larger rotor is greater, but also keep in mind the total amount of energy that needs to be disipated (heat in this case) is going to be the same.

I agree with you, NASCAR teams are getting the most out of what the rules allow them to do. That is something people have to be very careful about when interpeting what NASCAR, F1, ect do to thier cars and use it as a basis for logic of what to do with thier own car. They are constrained by rules. In the racing I do, I would love to upgrade my front brakes to a 14" setup, but NASA limits us to 17" wheels, which keeps us to 13" setups, which is exactly the reason for the 17" rule. It's very complicated and most people arent aware of how it all is interelated.

Brian

[YouNeverSawMeHere]

Clean,
If you want them for looks, there is nothing wrong with that. Just don't buy them under the false idea that they will perform better. If performance is your number one concern, but a set of plain brembo rotors.

That said, there are some race brake pads that recommend slotted rotors for a specific compound pad. I am not aware of a street pad that recommends it.

One last thing, despite whatever idiotic arguments you have heard, drilled and slotted rotors are NOT a performance advantage for braking performance!!!!!!!!!!!!!!!! "Saleen use them", and "Porsche use them" type reasoning is bullshit, they are going for bling, which sells cars!!!! There are situations where you can get by with drilled rotors, but they are not an advantage.(period)



Brian

I heard that the original idea was for cooling therefore unlike normal discs they wouldn't warp due to heat stress which is the numero uno reason rotors warp and therefore neither would they crack or chip under stress.

Don't buy they for braking performance, buy them for durability... at least thats what I've always heard.

[MadMatt]

Nay, I think slotted or drilled rotors are just a gimmick.

[mnstang]

I heard that the original idea was for cooling therefore unlike normal discs they wouldn't warp due to heat stress which is the numero uno reason rotors warp and therefore neither would they crack or chip under stress.

Don't buy they for braking performance, buy them for durability... at least thats what I've always heard.

that's why all of them crack right

[bad-speller]

I heard that the original idea was for cooling therefore unlike normal discs they wouldn't warp due to heat stress which is the numero uno reason rotors warp and therefore neither would they crack or chip under stress.

Don't buy they for braking performance, buy them for durability... at least thats what I've always heard.

Go up to the person that told you that and beat them over the head with a stick, give them a few hits for me as well.

Brian

[Mach2]

About 2 years ago,while replacing my brakes on my 1997 cobra, i added cross drilled and slotted rotors. they have reduced my stopping distance by about 5%, and also reduced brake pad life.After repeated stops, they also fade less.I plan on adding them to my Mach as soon as I replace the pads.

[bad-speller]

About 2 years ago,while replacing my brakes on my 1997 cobra, i added cross drilled and slotted rotors. they have reduced my stopping distance by about 5%, and also reduced brake pad life.After repeated stops, they also fade less.I plan on adding them to my Mach as soon as I replace the pads.

Ok, I need to get some clarification here. You got better braking performance by 5%? Please tell me how you measured this and give me details. You faded less????????????? You have alot of fading problems on the street?

Brian

[mnstang]

they look attractive on a big rotor like that, but not on a stock fox one!

[2 beer]

Ok, I need to get some clarification here. You got better braking performance by 5%? Please tell me how you measured this and give me details. You faded less????????????? You have alot of fading problems on the street?

Brian

I think he meant that compared to his worn out pads and warped and grooved rotors he saw an improvement

[StangerJon]

2 peice rotors are where its at.

[Outrun]

2 peice rotors are where its at.

Why? You have to balance the hub and rotor separately, and you save a litle bit of weight, but unless you have a track car, seems like a waste of $$$ for a Mustang. I suppose they are better for cooling since they are vented all of the way through, but I dunno, I would spend my money elsewhere.