Why do 'supercars' use cross drilled and not slotted brake rotors

[Racebred]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

kns.....maybe my laptop too old.

anyways what i wanted to show, is from my own car, most holes are cracked, and almost all of them are filled up with grime, so got hole like no hole like that. This is a 4 pot OEM from Brembo. anyone who can manage to attach, maybe do for me la.

 

[Shaun]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

2 feilows (1 major, 1 minor) recently missed a trackday cos their high end drilled stuff cracked and was unsafe to run

both members here

 

[Shaun]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

Interestingly, good tires is actually the best upgrade for your braking system, followed by pads

In general for the one stop scenario around town that is right, but outside of that (and there are many situations) it depends because if you are having say peak rotor temp issues and boiling fluid, then ducting and a rotor with more mass will help more than the tires or pads. It all depends on the situation and where the weak and strong points in the existing system are.

 

[ryan]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

My cross drilled rotors cracked halfway.

Front pair, the rest of the holes all had cracks. I switched to slotted rotors recently

 

[kenntona]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

can argue all day but in the end if you look at all the top 5s or 10s internationally.. the harshest brake applications pros.. enthsuiasts even.. etc. it is unanimous

Perhaps material-wise, I concur with you that slotted is better than cross-drilled in steel rotors, but I dun see the following observations as an argument, more of a discussion:

(1) Ceramic brakes are mostly cross-drilled. I presume ceramic discs will not crack?

(2) GT3, M3 CSL, Scuderia are all track cars, but all on cross-drilled stock rotors?

 

[Shaun]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

Perhaps material-wise, I concur with you that slotted is better than cross-drilled in steel rotors, but I dun see the following observations as an argument, more of a discussion:

(1) Ceramic brakes are mostly cross-drilled. I presume ceramic discs will not crack?

(2) GT3, M3 CSL, Scuderia are all track cars, but all on cross-drilled stock rotors?

GT3 and M3 CSL brakes crack and fail. Scuderia I don't know about..never seen firsthand cos rare... maybe not as easy cos of its different material.

Look beyond street supercars that are much more compromised on every level and cater mainly to older gentlemen who most often aren't focused on performance but flash.

Why isn't anyone looking for the most objective performance-oriented arenas worldwide and looking at what they run and why? The ones where regulations free them to run what they want, and where they're not sponsored by company X that sells flash on their street line. Carbon carbon, cast iron, there are no holes...

Or look through the full catalog of the top 3 brake manufacturers world wide. Look for the harshest application rotors, or the calipers and accompanying rotors.

How about this...anyone can answer this question. What is the highest level of non brake-sponsored or brake-regulated racing where xdrilled or xcast rotors are run?

 

[TripleM]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

Carbon-ceramic brake discs are composed of carbon fiber within a silcon carbide matrix..Carbon ceramic brakes are lightweight and have a very high specific heat and thermal conductivity, so making them ideal as brake rotors able to withstand over 1600 °C. They are also very expensive and require special pads, delegating them for use mostly on high end applications such as the Porsche CGT. The lifespan of carbon-ceramic brakes is limited by cracking that occurs because of the different rates of expansion between the carbon and the silicon carbide. These cracks slowly allow air to come in contact with the carbon, resulting in burning.

 

[Shaun]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

I have no experience with carbon ceramic, only carbon carbon. All I know is that if cooling is taken care of, a single set of rotors can last an entire racing season of road course racing. Mess up bias or cooling and the rotor will burn up and wear out within a single race.

These guys selling carbon carbon brake systems are also cutting throats. You can get race quality carbon carbon rotors and pads at anywhere from 1500 - 2500 USD per corner. That's under 10K USD for a whole car. All that's left are the hats and bobbins. The calipers are not radically different. and you can use normal calipers with a few modications to the pistons and ducting.

 

[JLMC]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

well...lots of interesting analysis n couinter-strike...luv it :whipper:

to Racebred (the Admin),
i oso had discussed this issue with Azriel/Sam n cfm its server migration issue...
maybe Sam will give us updates , on how soon members can upload pics.

 

[kenntona]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

Actually these discussions are good. They made me realised that almost every track car, from Porsche to BMW to Ferrari failed in their brake designs..... quite a revelation......

 

[totoseow]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

scud brakes 398 in front

 

[TripleM]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

Actually these discussions are good. They made me realised that almost every track car, from Porsche to BMW to Ferrari failed in their brake designs..... quite a revelation......

Since one can afford the car, so it's no "big deal" as far as the replacement cost is concerned and gentlemen suckers sure go back to dealers to get em replaced....toto says one.

 

[Girettom]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

As I understood it, breaking was all about friction and leverage. So

The faster you can turn kinetic energy into heat energy the better; and
The bigger your rotors are the faster you'd be able to stop.

The only problem with heat is that your rotors wear away quicker, as Shaun mentions above.

0.02c

 

[marklee]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

The bigger your rotors are, the faster the heat is dissipated from your pads to the rotors also.

 

[marklee]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

Are xdrilled rotors from porsche, ferrari etc really cast with the holes in them, or is it a myth? Does it really make a significant difference whether they are cast with holes or drilled after casting as blank rotors?

 

[Ahbengdriver]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

wah didnt know my ignorant question attracted so much discussion n opened up a can of worms for cross drileld rotors

Now I am already thinking that in future I may wanna change to slotted:thinking: .

Any $@*king reason why brembo doesnt make cross/slotted combo rotors?

 

[totoseow]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

brakes on a F1 car

 

[totoseow]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

check out the brakes on a ferrari F1 car...neither slotted nor drilled!

The Official Formula 1 Website

 

[Girettom]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

F1 is probably not the best source for ultimate anything though, because so many rules have been introduced to marginalise any true technical advantage (breaking, aerodynamics etc.).

The page you referenced even says "So good are the brakes that the regulations deliberately discourage development through restrictions on materials or design, to prevent even shorter braking distances rendering overtaking all but impossible"

Probably better to look at LeMans cars or WTC

 

[totoseow]

Re: Why do 'supercars' use cross drilled and not slotted brake rotors

ok F1 u dun like..what about this?