[TRooper_]

So during the Motor Trend head 2 Head match between the Golf R and Focus RS, they managed to catch the RS pads on fire. I don't mean overheated and faded, I mean like actual flames were coming off the pad. This was a 100% stock RS on a spirited drive. People reallly need to remember that these are still street cars and they do have limitations.

Check out the video on Motortrend's YouTube page. flames start at 8:23-8:33

 

[kshatt06]

Haha I saw this and just kind of put my head down and laughed for a minute.

 

[AgtDALLAS]

Haha I saw this and just kind of put my head down and laughed for a minute.

Haha did the same. Can't really expect anything else when you thrash a car a few miles then stand on the brakes one final time to come to a halt.

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[mitch808]

I've smoked stock brakes, and "street performance," pads on the street and track. Basically by over driving them for their purpose. The RS is not immune to this.

I'd wager that some of the fancy torque vectoring is probably even making the issue worse than it should.

Slap some sticky rubber on there, and the issue is probably going to improve for the better.

 

[Speedy12139]

Can't really expect anything else when you thrash a car a few miles then stand on the brakes one final time to come to a halt.

Basically by over driving them for their purpose

This x10000
You can have the worlds biggest baddest brakes... sooner or later, you will overdrive them

 

[Bryman13]

Hahaha! I guess if you drive the car like that you would benefit from cross-drilled rotors.

 

[mitch808]

Hahaha! I guess if you drive the car like that you would benefit from cross-drilled rotors.

What do you think, removing mass from a rotor is going to accomplish?

 

[Bryman13]

What do you think, removing mass from a rotor is going to accomplish?

It's not about removing mass. Drilling is all about being able to expel heat quicker, allowing your brakes to stay cooler and thus remaining effective longer... oh, and not catching on fire.

 

[mitch808]

It's not about removing mass. Drilling is all about being able to expel heat quicker, allowing your brakes to stay cooler and thus remaining effective longer... oh, and not catching on fire.

You're mistaken.

The primary purpose is that they are for a place for venting or outgassing of pads to go. Nothing to do with removing heat, or staying cooler. You've been suckered into the brake hype dating back to Fast and the Furious and perhaps even before that.

Secondary would be increased bite through more leading edges for the pad.

Tertiary benefit would be cooling if it all beneficial unless you drive 9/10ths all the time on the street...


EDIT: I should add that the holes also serve a purpose for wet weather too, and not all holes are created equal. They should ideally be cast in, and not drilled in after the fact like many cheap rotors do.

 

[GoGo]

Cross drilled rotors are crap for the track. Don't confuse dimpled for cross drilled, completely different . ESSEX has good information on which way one should head for improved braking performance, (videos etc) or Todd can fill you in on the Willwood stuff. The biggest problem is always pad choice. No such thing as a street and track friendly pad.

 

[mitch808]

Cross drilled rotors are crap for the track. Don't confuse dimpled for cross drilled, completely different . ESSEX has good information on which way one should head for improved braking performance, (videos etc) or Todd can fill you in on the Willwood stuff. The biggest problem is always pad choice. No such thing as a street and track friendly pad.

Not entirely true at all. You gonna crap on the Porsches that have it stock? Or other cars with factory carbon rotors that are drilled? No you won't.

They have a legitimate purpose and are acceptable on a track car with proper inspection and maintenance.

They add bite with more leading edges to grab on to. On a slotted rotor they keep the pad face clean. Then there are as you mentioned dimples too. Not better or worse in most street applications.

 

[Bryman13]

You're mistaken.

The primary purpose is that they are for a place for venting or outgassing of pads to go. Nothing to do with removing heat, or staying cooler. You've been suckered into the brake hype dating back to Fast and the Furious and perhaps even before that.

Secondary would be increased bite through more leading edges for the pad.

Tertiary benefit would be cooling if it all beneficial unless you drive 9/10ths all the time on the street...


EDIT: I should add that the holes also serve a purpose for wet weather too, and not all holes are created equal. They should ideally be cast in, and not drilled in after the fact like many cheap rotors do.

Yes, removing the gases, allowing the brakes to be more effective, therefore providing better braking under less braking effort, with the added side effect of keeping your brakes cooler. Less energy = less heat. Same concept with slotted rotors. Slotted has become more popular because under extreme conditions the drilled or more likely to crack.


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[GoGo]

Yup going to crap on them. Good looking at the dealership and on the street, change them for the track.
If you have an endless racing budget and are looking for every 100 th of a second they have a place. If your a weekend racer on a budget looking for performance and longevity not the ticket.
The Porsches I run with at the home track have found the same thing. Cross drilled rotors do not last as long at the track as the alternatives and the gains versus cost do not justify the expense. Essex has some good information on this subject I suggest any one interested take a look, they do a much better job of explaining it than I can.
We are talking individuals that run upwards of a dozen track days with NASA, SCCA or the like. Where average consumable costs are are several thousand dollars a year. SO yeah longevity and reliability of components counts.

Not entirely true at all. You gonna crap on the Porsches that have it stock? Or other cars with factory carbon rotors that are drilled? No you won't.

They have a legitimate purpose and are acceptable on a track car with proper inspection and maintenance.

They add bite with more leading edges to grab on to. On a slotted rotor they keep the pad face clean. Then there are as you mentioned dimples too. Not better or worse in most street applications.

 

[SiThlord]

I am going to second this. Cross drilled are not ideal, and if you look at some "top tier" race cars you don't see drilled so I think that says enough as well. On top of what Gogo is saying, the durability is not worth it. Proper brake cooling and some slotted if you want, but drilled... wouldn't go there lol


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