Cross drilled rotors, better or not?

[SkylineUSA]

So, you read the whole post? I guess looks count for a lot, at least your some what better informed.


True. Crossdrilled rotors were developed for racing in the 50s when brakes pads sucked. They would off-gas at relatively low temperatures. The holes gave the gas somewhere to go. If not, it would get trapped between the rotor/pad and the pad would not make contact with the rotor. That is called "fade". Modern brake pads do not do this. True, if you take a street pad to the race track and exceed it's operating temperature, you can get it to fade. But I challenge you to get a Hawk Blue, or Porterfield R4 brake pad or other dedicated racing pad to fade. Ever. Simply, crossdrilled rotors fix a problem that no longer exists.


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Why? Because, when you drill holes in your rotors, they are designed to dissipate heat (not to rid of brake dust as most people think).
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Surface area dissipates heat. The amount of surface you create from drilling holes is almost insignificant compared to the initial surface area of a standard OE vented. In additionx-drilled rotors will reach higher peak temperature because you are removing metal from the rotor. The metal is what absorbs the heat. Plus, you are reducing pad/surface interface. Tell me again why this is a good idea?


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I ask any local non-believers to take a ride in my car, I would be happy to allow them to drive it just so they can tell you about the brakes
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I do not doubt your car stop well. Obviously, if you replace busted/worn out OE parts with new x-drilled parts, of course it's going to stop better. What I do doubt is that it stops better than regular new OE-style non-drilled/slotted rotors. I *garuntee* it does not.

Don't believe me? Will you believe an engineer that designs automotive braking systems?

[Pnoi Q]

Originally posted by SkylineUSA
[b]So, you read the whole post? I guess looks count for a lot, at least your some what better informed.

I'm still a noob, so bear with me.

Yeah it's true that looks count for alot. Especially if your aspiring to be winner or at least runner up at HIN; unfortunately, for me at least, I can't focus solely on looks because my brakes actually need to stop (the car I plan on entering into HIN is also my daily driver) That's why I wanted the best of every world.

But from what you've given me crossdrilled rotors aren't required anymore. What about large diameter rotors with slots? Maybe I'll end up just getting high quality calipers/pads and large rotors. Brakes are actually my priority mod right now; so any advice will be taken gratefully.

[SkylineUSA]

Pnoi Q,

You might be a noobie, but at least you get it, unlike some others that cannot understand physics.

Slots are OK, if you need the so called "bling, bling" effect, but will tell you this, I would never put crossdrilled brakes on my GTR.

Its up to you, what you put on your car. If you want guidance from me, my brakes will have the most mass as possible, with cooling ducts, racing brake fluid, and some damn good pads.

I do not know what Hondas have for aftermarket brake systems, but the set of brakes for my car will run about $3k.

[Pnoi Q]

What brake kit are you using?

[SkylineUSA]

Right now I am running the stock ones, but I have my eye on some APs, or maybe some Brembos.

I have a few more months to look into it. I never just take one source for my information and think thats gospel, so I am still doing research.

[88_SC_CRX_Si]

Originally posted by SkylineUSA
Pnoi Q, and 88_SC_CRX_Si,

Did you guys read, by chance, the link I posted? I am thinking, no.

Yes, I did read the post you posted, why do you think I posted on this one... It does not have any mention from PEEPS, that ACTUALLY do work in the industry. Unless I missed something there... among all the flamming and so forth. hehehehe

Sure, I can install brand new rotors/pads... What good is that, if I do not have the system flushed along with it... It depends on the overall condition of the system. Rather then just a couple of components, that will deceide how well things will work.

Anyway, to each his own....

[SkylineUSA]

If you do any brake work I would hope you would flush the system, that goes without saying. You are right, to each his own.

Sure if your going to be doing alot of track racing, then you want to step-up to the drilled/slotted ect

You might want to do a little more research

[88_SC_CRX_Si]

It's whatever.... hehehe

[seth 90DX/ZC]

Ok. I just put some Ractive cross drilled and sloted rotors on my car. I put on new OEM pads as well. I can stop on a dime. I noticed imeadeatly an improvement in braking. Say what you will, but if you didnt notice they are on all the stock cars and indy cars... Why?

[Frostbyte]

Originally posted by seth 90DX/ZC
Ok. I just put some Ractive cross drilled and sloted rotors on my car. I put on new OEM pads as well. I can stop on a dime. I noticed imeadeatly an improvement in braking. Say what you will, but if you didnt notice they are on all the stock cars and indy cars... Why?

Also why would they come stock on Porche TT's and pretty much all other porche's and high end Sports Cars? Why is it that the Porche has one of the best braking distances? That doesn't make since to me because there are engineers that design those.

[SilverY2KCivic]

Originally posted by SkylineUSA
Pnoi Q,

You might be a noobie, but at least you get it, unlike some others that cannot understand physics.

Slots are OK, if you need the so called "bling, bling" effect, but will tell you this, I would never put crossdrilled brakes on my GTR.

Its up to you, what you put on your car. If you want guidance from me, my brakes will have the most mass as possible, with cooling ducts, racing brake fluid, and some damn good pads.

I do not know what Hondas have for aftermarket brake systems, but the set of brakes for my car will run about $3k.

If it's just "bling bling" like you say, then why do the new S-class Benz's come STANDARD with x-drilled rotors? Why do Porsche's come with x-drilled rotors? I could go on with other cars that come from the factory with them. If they weren't nessacery or made a differance on brake systems anymore, then companies wouldn't be putting them on cars. A manufacture wouldn't put a part like that as STANDARD equipment on a car just for show. Think before you post.

I'll give you that you gotta be going some pretty fast speeds for the drill holes or slots to make a differance, but they can and DO make a differance. But I'd say above all is on what pads you're using, what kind of lines, and what fluid is running the system.
On my Civic I'm running Power Slot rotors, and AEM/Nissin OE spec hi-pro pads on the front (not much aftermarket help for rear drums short of swapping out for rear discs) and then I'm gonna get a complete brake system flush soon here, and replaced with some Motul DOT4 racing fluid, and then the lines changed out for some Goodridge S/S lines.

[SkylineUSA]

The plethora of cars you mentioned are NOT X-DRILLED, they are cast with the holes in them, you might want tothink before you post.

You can lead a horse to water, but you can not make him drink, most of you guys are going to die from dehydration.

If you guys swear by holes being drilled into your rotors, so be it. The information is out there.

I give, Peace.

[SilverY2KCivic]

Originally posted by SkylineUSA
The plethora of cars you mentioned are NOT X-DRILLED, they are cast with the holes in them, you might want tothink before you post.

You can lead a horse to water, but you can not make him drink, most of you guys are going to die from dehydration.

If you guys swear by holes being drilled into your rotors, so be it. The information is out there.

I give, Peace.

I never said my brakes had any holes in them, now did I?

And upp I dunno what rock you're living under but EVERY car i mentioned in my post has or comes with DRILLED rotors of some sort whether it by true cross drilled or POS drilled after the fact. And I HIGHLY doubt the $3k Brembo system on a Porsche isn't a TRUE x-drilled system (that's what the holes are called no matter how they are put into them). Think about it, what other car has an option of ceramic brake rotors and a super high performance braking system?

Anywho, I was thinking before I posted, you basically stated that holey discs are pointless, I'm showing you that they aren't, if manufactures like MBZ or Porsche doesn't think they are, they wouldn't spend the extra to put them on their cars. And yes, I already knew those cars come with pre-cast drill type holes, rather than ignorantly drilling the holes after the fact.

I know I certainly wouldn't die in that desert.

[seth 90DX/ZC]

Originally posted by SkylineUSA
True. Crossdrilled rotors were developed for racing in the 50s when brakes pads sucked.

Are yopu out of your mind? The brake pads in the 50's-60's-70's were espestos! They are WAY better than the shit pads we wipe our brakes with now dude! The only reason we dont use the better pads now is becasue of a bunch of hippie as inviro's fuckin up the scene once again. Now they fuck up our emissions shit with dyno rollers.

[seth 90DX/ZC]

Originally posted by SilverY2KCivic


I never said my brakes had any holes in them, now did I?

And upp I dunno what rock you're living under but EVERY car i mentioned in my post has or comes with DRILLED rotors of some sort whether it by true cross drilled or POS drilled after the fact. And I HIGHLY doubt the $3k Brembo system on a Porsche isn't a TRUE x-drilled system (that's what the holes are called no matter how they are put into them). Think about it, what other car has an option of ceramic brake rotors and a super high performance braking system?

Anywho, I was thinking before I posted, you basically stated that holey discs are pointless, I'm showing you that they aren't, if manufactures like MBZ or Porsche doesn't think they are, they wouldn't spend the extra to put them on their cars. And yes, I already knew those cars come with pre-cast drill type holes, rather than ignorantly drilling the holes after the fact.

I know I certainly wouldn't die in that desert.

Ok lets clarify for all the suhie's out there (Inside joke The X-drilled part wether it be drilled or casted (it doesent mater its the same fucking thing) is there to cool the discs, this alows MORE braking. Sloted rotors arent just for show, if you actualy read about this shit you would know there is a gas that builds up between the pads and the rotor which pushes the pads off the rotor until it blows out under presure and your wheels lock up. I have noticed its ALOT harder to lock up my wheels, I realy have to slam on the brakes goin 100+ mph. Basicaly I could slam your face into my window hard enough to break the window stoping from 100 if you werent wearing your seat belt without skiding or locking up my wheels. So the slots are there to relieve gas under presure.