Those Brembos, fixed caliper? Or not? [Patent inside!]

[ichitaka05]

Originally Posted by Dimman

They could even be functional!

Right? We can make a ton of money!

[Type[R]+]

Originally Posted by LionZoo

I think you misconstrued a lot of people's statements. Nobody called them shit, but for pure performance they're not optimal. Obviously they'll still stop you, but when you're trying to eek out every single fraction of a percent in performance, they're not what you need. I don't believe the supercar manufacturers put them on for performance reasons. It's merely that they work, they sell, and customers want them, so on they go.

As far as I can tell, slotted rotors are too noisy and are too harsh on pads for street car. With the drilled, you still get the pad cleaning benefits ect. without the noise. Seems the Alcon grooved rotors have maximized the positives while minimizing the negatives. Just seems strange that if drilled rotors are as bad as everyone makes them out to be, that they'd supply them to all these top end cars? And these are cars with the best braking performance on the road? It can't just be negative, why would manufacturers risk it? And if people really wanted to look 'cool', wouldn't they want what all the race cars are using? I've only found Ferrari using slotted rotors, and IMO, they look 'way cooler' lol!

I sent a few emails out last night to a few manufacturers, I'll see if I get anything back.

It might just be a case of Brembo being the supplier, and that's what Brembo uses.....

[ichitaka05]

Originally Posted by Type[R]+

As far as I can tell, slotted rotors are too noisy and are too harsh on pads for street car. With the drilled, you still get the pad cleaning benefits ect. without the noise. Seems the Alcon grooved rotors have maximized the positives while minimizing the negatives. Just seems strange that if drilled rotors are as bad as everyone makes them out to be, that they'd supply them to all these top end cars? And these are cars with the best braking performance on the road? It can't just be negative, why would manufacturers risk it? And if people really wanted to look 'cool', wouldn't they want what all the race cars are using? I've only found Ferrari using slotted rotors, and IMO, they look 'way cooler' lol!

I sent a few emails out last night to a few manufacturers, I'll see if I get anything back.

It might just be a case of Brembo being the supplier, and that's what Brembo uses.....

Where did you get that info? Did some Aftermarket brake company or car company did some research on this? I'm not saying you're lying. Just wanna know if that's a fact

[Type[R]+]

Originally Posted by ichitaka05

Where did you get that info? Did some Aftermarket brake company or car company did some research on this? I'm not saying you're lying. Just wanna know if that's a fact

Just what I've been reading over the last few hours. Even posted at the start of this thread...

Which part specifically?

If you've got info man, throw it up!!!

[ichitaka05]

Originally Posted by Type[R]+

Just what I've been reading over the last few hours. Even posted at the start of this thread...

Which part specifically?

If you've got info man, throw it up!!!

K, I'll go back and re-read em again.

The part specifically is

slotted rotors are too noisy and are too harsh on pads for street car. With the drilled, you still get the pad cleaning benefits ect. without the noise.

[Type[R]+]

Originally Posted by ichitaka05

K, I'll go back and re-read em again.

The part specifically is
"slotted rotors are too noisy and are too harsh on pads for street car. With the drilled, you still get the pad cleaning benefits ect. without the noise."

Ok, all the comments I've read about slotted rotors is that they are noisy. Even from the manufacturers. Comments I've read from users is you can feel every slot with light braking, and chew out pads.

Comments about drilled is they provide the same types of benefit as slotting, you don't get the noise, and porsche got drilled rotors for cooling. Downside is obviously cracking.

[serialk11r]

I wouldn't be surprised if that were true, although I think with drilled holes a similar phenomenon would happen? Although maybe because the holes are small compared to the slots, the vibrations aren't as strong so it's harder to feel.

[Type[R]+]

Originally Posted by serialk11r

I wouldn't be surprised if that were true, although I think with drilled holes a similar phenomenon would happen? Although maybe because the holes are small compared to the slots, the vibrations aren't as strong so it's harder to feel.

Don't know? Pad surface area is huge on mine, and the holes are tiny. They just feel smooth as, no matter what pressure is applied. Might be different on smaller brakes. They got good initial bite, which is what I've read are one benefit from drilled and slotted rotors.

I extremely doubt the holes are there for making them lighter as others have suggested, they'd just make them thinner and save a crap load more weight than a hole can. From what I've read, you need the mass/volume anyway.

[LionZoo]

The disadvantages of drilled rotors show up when you put them through high temperature heat cycles. This type of heat is generally only achievable on track and during rallies, when you are basically pounding on the brakes. The holes are a stress concentrations that increase the stress on the rotors when they are forced to heat up and cool down through large temperature deltas session after session.

Your rotors won't crack through normal street driving which, let's face it, is the only thing the vast majority of car owners, exotic or otherwise, would subject their cars to. It's also fine for the occasional panic stop; it's the constant pounding on rotors that kills them. The typical exotic owners baby their cars (don't get me started on Ferrari drivers at the track...), so their cars are unlikely to ever see the type of duty cycle that would stress the rotors. Also, brakes on exotics are way oversized (14"+ and counting these days, which is actually bigger than a lot of racecars) so they have a lot of reserve heat capacity, which means they're less likely to overheat. All of these factors mean that it's PERFECTLY ACCEPTABLE to have drilled rotors, but it isn't IDEAL.

[ichitaka05]

^How bout slotted ones? Slotted have bigger/longer space of dip (not a hole, but) so I feel slotted rotors get stressed more than drilled. Or cuz it's not fully drilled through like (drilled ver), it can take the beating more?

[LionZoo]

Originally Posted by ichitaka05

^How bout slotted ones? Slotted have bigger/longer space of dip (not a hole, but) so I feel slotted rotors get stressed more than drilled. Or cuz it's not fully drilled through like (drilled ver), it can take the beating more?

Yes that's correct. Slotted rotors do chew up pads more than drilled rotors. However, since the slots in most slotted rotors are just grooved indents, that helps a lot in terms of what stresses the rotor sees. At the risk of greatly simplifying things, stress flow in metallic materials is almost like water flowing; it doesn't want to make sharp turns. A drilled hole is going to make the stress turn more than an indentation.

[ichitaka05]

Originally Posted by LionZoo

Yes that's correct. Slotted rotors do chew up pads more than drilled rotors. However, since the slots in most slotted rotors are just grooved indents, that helps a lot in terms of what stresses the rotor sees. At the risk of greatly simplifying things, stress flow in metallic materials is almost like water flowing; it doesn't want to make sharp turns. A drilled hole is going to make the stress turn more than an indentation.

Thanks for the lesson! :happy0180:

[Dave-ROR]

Originally Posted by LionZoo

The disadvantages of drilled rotors show up when you put them through high temperature heat cycles. This type of heat is generally <snip>
gger than a lot of racecars) so they have a lot of reserve heat capacity, which means they're less likely to overheat. All of these factors mean that it's PERFECTLY ACCEPTABLE to have drilled rotors, but it isn't IDEAL.

Removed part of that just to make the quote smaller.

I agree 100% with everything he just said. It's been the point this whole time

TypeR: If you want to personally experience what we are talking about then take the IS-F to some track days. You'll see the cracks in the drilled rotor arguement soon enough (pun intended :P ).

[Dave-ROR]

Originally Posted by LionZoo

Yes that's correct. Slotted rotors do chew up pads more than drilled rotors. However, since the slots in most slotted rotors are just grooved indents, that helps a lot in terms of what stresses the rotor sees. At the risk of greatly simplifying things, stress flow in metallic materials is almost like water flowing; it doesn't want to make sharp turns. A drilled hole is going to make the stress turn more than an indentation.

I think the J hook stlye (like ALMS cars use) slotted rotors seem to help with the old problems of slotted rotors too, and they are more nicely cut then crap like powerslots (ie, not cut at 90 degrees).

http://www.gtrblog.com/wp-content/up...rotors-001.jpg

And a whole lot less material removed of course than drilled/casting with holes.

I'm sure they still chew the hell out of anything less than an HT-10 or better pad though. I'd be willing to try a set sometime though. The only slotted sets I've ever tried were shit but I'm always up for something new.

Of course, they'd have to make them for my car, which I doubt they do.