Beginning to find my crossed drilled brembos noisy. But noticed most upmarket cars uses cross drilled(Yeah I know its for better cooling) but why not slotted?
Why do 'supercars' use cross drilled and not slotted brake rotors
- Thread starter Ahbengdriver
- Start date
axl
Well-Known Member
Re: Why do 'supercars' use cross drilled and not slotted brake rotors
-> Surrealmirage - Rotors: Analysis of Cross-drilled vs. Slotted
"Ok to sum everything up. Cross-drilled rotors are good for fast heat dissipation and reduction in braking gasses, however they are prone to warpage because of their less amount of material, and lower peak temperature tolerance. They are good for racing applications where you need very fast cooling from high-speed stops, and where they don't care about the longevity of the rotors. They are not practical if you want to get more life out of your rotor. Slotted rotors main advantage is that they help get rid of the braking gasses between the rotor and pad. They are good for mild to medium racing applications and for the performance minded street driver. The longevity will be greater then that of cross-drilled, yet may be a little less then stock. There are also high performance rotors that offer a combination of both slotting and cross-drilling."
And from Stoptech FAQ:
Which is better, slotted or drilled rotors?
StopTech provides rotors slotted, drilled or plain. For most performance applications slotted is the preferred choice. Slotting helps wipe away debris from between the pad and rotor as well as increasing the "bite" characteristics of the pad. A drilled rotor provides the same type of benefit, but is more susceptible to cracking under severe usage. Many customers prefer the look of a drilled rotor and for street and occasional light duty track use they will work fine. For more severe applications, we recommend slotted rotors.
-> Surrealmirage - Rotors: Analysis of Cross-drilled vs. Slotted
"Ok to sum everything up. Cross-drilled rotors are good for fast heat dissipation and reduction in braking gasses, however they are prone to warpage because of their less amount of material, and lower peak temperature tolerance. They are good for racing applications where you need very fast cooling from high-speed stops, and where they don't care about the longevity of the rotors. They are not practical if you want to get more life out of your rotor. Slotted rotors main advantage is that they help get rid of the braking gasses between the rotor and pad. They are good for mild to medium racing applications and for the performance minded street driver. The longevity will be greater then that of cross-drilled, yet may be a little less then stock. There are also high performance rotors that offer a combination of both slotting and cross-drilling."
And from Stoptech FAQ:
Which is better, slotted or drilled rotors?
StopTech provides rotors slotted, drilled or plain. For most performance applications slotted is the preferred choice. Slotting helps wipe away debris from between the pad and rotor as well as increasing the "bite" characteristics of the pad. A drilled rotor provides the same type of benefit, but is more susceptible to cracking under severe usage. Many customers prefer the look of a drilled rotor and for street and occasional light duty track use they will work fine. For more severe applications, we recommend slotted rotors.
Re: Why do 'supercars' use cross drilled and not slotted brake rotors
ABD, because the car has to look the part and the manufacturers cave to consumer pressure. Same reason for the trend towards ridiculously large rims and paper thin tires especially in the aftermarket.
Axl, neither source is entirely right, with the first being almost completely wrong. Look at the top 5 harshest brake applications in racing internationally, or even the 5 largest and most serious enthusiast track groups internationally. None of them run xdrilled or xcast rotors. The whys you can find out with enough digging around.
ABD, because the car has to look the part and the manufacturers cave to consumer pressure. Same reason for the trend towards ridiculously large rims and paper thin tires especially in the aftermarket.
Axl, neither source is entirely right, with the first being almost completely wrong. Look at the top 5 harshest brake applications in racing internationally, or even the 5 largest and most serious enthusiast track groups internationally. None of them run xdrilled or xcast rotors. The whys you can find out with enough digging around.
Re: Why do 'supercars' use cross drilled and not slotted brake rotors
Answer is simple
Cross drilled looks in the eyes of consumers...
They are prone to cracking, which means more replacements needed => OEM manufacturer make more money
To sum it up, Looks good and money suckers.
Answer is simple
Cross drilled looks in the eyes of consumers...
They are prone to cracking, which means more replacements needed => OEM manufacturer make more money
To sum it up, Looks good and money suckers.
Re: Why do 'supercars' use cross drilled and not slotted brake rotors
Kenn, it starts with a hairline crack on holes area then they the cracks get deeper and start to connect with the neighbouring holes. When the latter happens, it's really time to change.
I think 2-3 track days on hard braking will induce the hairline cracks, quite easily.
Kenn, it starts with a hairline crack on holes area then they the cracks get deeper and start to connect with the neighbouring holes. When the latter happens, it's really time to change.
I think 2-3 track days on hard braking will induce the hairline cracks, quite easily.
Re: Why do 'supercars' use cross drilled and not slotted brake rotors
Any research on which brands' cross-drilled cracked more often than its slotted? My take is more on a statistical analysis than a generalised scenario. Example - Brembo - how many cracked cross-drilled cases, vis-a-vis how many cracked slotted cases, versus other brands like AP, StopTech.......Why is Alcon's rotor design a hybrid? Why the rest dun follow?
The analysis will also cross-compare between brands, and act as a truthful comparison between (1) cross-drilled vs slotted within brands (2) brands.
Any research on which brands' cross-drilled cracked more often than its slotted? My take is more on a statistical analysis than a generalised scenario. Example - Brembo - how many cracked cross-drilled cases, vis-a-vis how many cracked slotted cases, versus other brands like AP, StopTech.......Why is Alcon's rotor design a hybrid? Why the rest dun follow?
The analysis will also cross-compare between brands, and act as a truthful comparison between (1) cross-drilled vs slotted within brands (2) brands.
Re: Why do 'supercars' use cross drilled and not slotted brake rotors
seen it on all brands of drilled, including the supposed best
as enthusiasts we'll run out of time and money before a test like that is complete. that's why you use the research that others (non commercial, purely focused on performance application) have done for you. It's just whether you want to take it up. It's all over the place.
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
seen it on all brands of drilled, including the supposed best
as enthusiasts we'll run out of time and money before a test like that is complete. that's why you use the research that others (non commercial, purely focused on performance application) have done for you. It's just whether you want to take it up. It's all over the place.
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
Re: Why do 'supercars' use cross drilled and not slotted brake rotors
Well, it is too common that it is not quite a subject of comparison ..
Any brands crack. Worse are those that drilled post manufacturing process rather than cast driled in the process.
Well, it is too common that it is not quite a subject of comparison ..
Any brands crack. Worse are those that drilled post manufacturing process rather than cast driled in the process.
Re: Why do 'supercars' use cross drilled and not slotted brake rotors
Cooling is primarily by the internal vanes and ducting. Everything else is distant second.
just like in modern times brakes are for braking, and the engine is for accelerating. downshifting is not for engine braking although increase engine braking does take place post downshift after the clutch is engaged again. It's just a side effect. Downshifting is to prepare for corner exit, that is all.
Drilling and slotting are not for cooling. Cooling is primarily by airflow and the max, min, average temps are dependent on course characteristics and rotor mass, in addition to the ducting and vane design.
marklee;434312 said:
Cooling is primarily by the internal vanes and ducting. Everything else is distant second.
just like in modern times brakes are for braking, and the engine is for accelerating. downshifting is not for engine braking although increase engine braking does take place post downshift after the clutch is engaged again. It's just a side effect. Downshifting is to prepare for corner exit, that is all.
Drilling and slotting are not for cooling. Cooling is primarily by airflow and the max, min, average temps are dependent on course characteristics and rotor mass, in addition to the ducting and vane design.
Last edited by a moderator:
Re: Why do 'supercars' use cross drilled and not slotted brake rotors
Just read this article after after reading this thread.
Drilled Brake Rotors | Build A Faster Car
Interestingly, good tires is actually the best upgrade for your braking system, followed by pads
Just read this article after after reading this thread.
Drilled Brake Rotors | Build A Faster Car
Interestingly, good tires is actually the best upgrade for your braking system, followed by pads
