[ARCHIVED THREAD] - Slotted Rotors? (Page 1 of 2)
Posted: 7/27/2016 5:05:33 PM EDT
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Slotted, but not cross drilled, what's the word on these?
Hype or beneficial? I do a lot of driving, about half stop and go, half 70+. 15K a year. Or stick with standard. |
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Some benefits to slotted rotors...mainly just allowing a place where crud can collect other than directly on the braking surface.
Drilled rotors, on the other hand, are just a bad idea. Those holes become an opportunity for stress fractures. Edit: Actual race brakes 
Notice the presence of slots, but no holes. |
| I've done slotted, drilled, slotted & drilled, and blanks with every type of pad under the sun from organic to kevlar. I've never noticed a difference in performance with rotors; pads yes, but not rotors. I didn't do any scientific tests, just my own personal experience on road courses and on the street. |
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http://ebcbrakes.com/articles/dangerous-cross-drilled-rotors/
Might want to read what that manufacturer (who makes a lot of high-performance brake components) has to say about drilling rotors. |
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I purchased drilled rotors and upgraded pads for a sports car in the past with good results (improved stopping power) and never had any issues other than some increased brake dust.
I also just purchased slotted AND drilled rotors for my Nissan Armada  . This is because my stock rotors are warped and the pads in the kit are supposed to be heavy duty / towing compound (and the kit was pretty cheap). The manufacturer claims the drilled rotors reduce brake heat. Their aren't many options for cheap replacement brakes for Armada's, so I will give this one a try.
The kit has a many reviews and receives a 4.7 rating on Amazon. It's getting installed tomorrow, so I will report back after I "brake" them in. |
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http://ebcbrakes.com/articles/dangerous-cross-drilled-rotors/ Might want to read what that manufacturer (who makes a lot of high-performance brake components) has to say about drilling rotors. Totally sending that link to Brembo and my friend with a Porsche. 
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I purchased drilled rotors and upgraded pads for a sports car in the past with good results (improved stopping power) and never had any issues other than some increased brake dust. I also just purchased slotted AND drilled rotors for my Nissan Armada . This is because my stock rotors are warped and the pads in the kit are supposed to be heavy duty / towing compound (and the kit was pretty cheap). The manufacturer claims the drilled rotors reduce brake heat. Their aren't many options for cheap replacement brakes for Armada's, so I will give this one a try.
The kit has a many reviews and receives a 4.7 rating on Amazon. It's getting installed tomorrow, so I will report back after I "brake" them in. Better pads and a proper bedding of the brakes are going to be where you get actual performance gains. Just properly bedding the brakes and properly bleeding the brakes after a brake job makes a HUGE difference in stopping performance. |
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Go with blanks. These Raybestos Advanced Technology rotors just arrived for my F-150 (only $58 each shipped): http://i65.photobucket.com/albums/h215/kptexan05/17BC6068-74F0-49BE-B21E-CB1A0F0E00D5_zpscl5tfwwi.jpg I've been using their pro series, what's the black? Paint, powder coat, nitride?? |
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Totally sending that link to Brembo and my friend with a Porsche. Quoted:
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http://ebcbrakes.com/articles/dangerous-cross-drilled-rotors/ Might want to read what that manufacturer (who makes a lot of high-performance brake components) has to say about drilling rotors. Totally sending that link to Brembo and my friend with a Porsche. I'm pretty sure that even porsche says they are mostly cosmetic because owners expect to see them on a Porsche |
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Quoted: Every time I've seen legit Porsche race cars with the wheels off (assuming the ones who use steel brakes, anyway) they've had slotted rotors...not drilled. https://racetechnologies.files.wordpress.com/2015/05/10380480_725113257553163_293994279633568863_o.jpg Quoted: Quoted: Totally sending that link to Brembo and my friend with a Porsche. Every time I've seen legit Porsche race cars with the wheels off (assuming the ones who use steel brakes, anyway) they've had slotted rotors...not drilled. https://racetechnologies.files.wordpress.com/2015/05/10380480_725113257553163_293994279633568863_o.jpg |
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http://ebcbrakes.com/articles/dangerous-cross-drilled-rotors/ Might want to read what that manufacturer (who makes a lot of high-performance brake components) has to say about drilling rotors. Ouch. I've got factory rotors, and they are drilled. I wonder if non-OEM replacements would be plain? |
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Possibly because it's a single layer disc, vs a dual layer internally vented disc like a car has. Quoted:
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Pretty much every street motorcycle comes with cross drilled rotors. Why do they work in that application but are no good for cars? Possibly because it's a single layer disc, vs a dual layer internally vented disc like a car has. I suspect partially this, and partially aesthetics. With maybe a tiny bit of intent to reduce rotating mass. |
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Maybe load/weight? No idea. Quoted:
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Pretty much every street motorcycle comes with cross drilled rotors. Why do they work in that application but are no good for cars? yeah, what about this here? Maybe load/weight? No idea. I think the suggestion above about dual layer rotors on cars vs. single layer rotors on bikes was a good one. On the dual layer rotor, there is nothing supporting the backsides of the disks at the open areas of the inner vents. On a single disk, the other pad is pushing against the backside. |
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Ouch. I've got factory rotors, and they are drilled. I wonder if non-OEM replacements would be plain? How, exactly, they are drilled matters too. There are companies out there who will "drill" your plain rotors...and likely fuck them up. A properly made set of rotors where the holes are drilled so as not to hit any of the veins in the rotor, and where the holes are counter-sunk to prevent a stress riser will do better than some yutz just putting a hole where it looks good. Still, even properly made the holes are still just an opportunity for cracks. |
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How many drivers here have had their calipers change color due to heat? Very few, I would wager. Quoted:
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If you aren't tracking your car there is no need. It is for heat dissipation you aren't fading your brakes in stop and go traffic so no need. How many drivers here have had their calipers change color due to heat? Very few, I would wager. Never. At those temps most rubber brake lines would be in danger of melting, I'd imagine. |
| I've had slotted.drilled rotors on a tracked car, now I just have slotted. Honestly, good pads are where its at. Rotors won't make any difference if you aren't aggressively using BIG brakes. You'd be surprised at some of the pads too, I've used expensive ass pads that didn't have the grip of stock GM ones... |
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Quoted: Never. At those temps most rubber brake lines would be in danger of melting, I'd imagine. Quoted: Quoted: Quoted: If you aren't tracking your car there is no need. It is for heat dissipation you aren't fading your brakes in stop and go traffic so no need. How many drivers here have had their calipers change color due to heat? Very few, I would wager. Never. At those temps most rubber brake lines would be in danger of melting, I'd imagine. You have never tracked a Volvo, eh? |
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Quoted: I've been using their pro series, what's the black? Paint, powder coat, nitride?? Quoted: Quoted: Go with blanks. These Raybestos Advanced Technology rotors just arrived for my F-150 (only $58 each shipped): http://i65.photobucket.com/albums/h215/kptexan05/17BC6068-74F0-49BE-B21E-CB1A0F0E00D5_zpscl5tfwwi.jpg I've been using their pro series, what's the black? Paint, powder coat, nitride?? |
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Quoted: yeah, what about this here? Quoted: Quoted: Pretty much every street motorcycle comes with cross drilled rotors. Why do they work in that application but are no good for cars? yeah, what about this here? If you look at the majority of modern top level race motorcycles, they are using slotted and wave rotors, not drilled. Drilled is what comes stock on many bikes because they are cheap to produce and look neat. Edit: or they run carbon brakes. I run wave rotors that are not drilled on my bike. |
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How many drivers here have had their calipers change color due to heat? Very few, I would wager. Quoted:
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If you aren't tracking your car there is no need. It is for heat dissipation you aren't fading your brakes in stop and go traffic so no need. How many drivers here have had their calipers change color due to heat? Very few, I would wager. Once, on my Z-car, when the parking brake stuck a rear caliper partially clamped down. Sumbitch was orange hot and you could see INTO the metal of the rotor by the time I pulled into the driveway and realized what was happening. Back in the days before camera phones unfortunately, wish I had a pic of it when it happened. |
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How many drivers here have had their calipers change color due to heat? Very few, I would wager. Quoted:
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If you aren't tracking your car there is no need. It is for heat dissipation you aren't fading your brakes in stop and go traffic so no need. How many drivers here have had their calipers change color due to heat? Very few, I would wager. I lit my brakes on fire in my 1G Neon once.
Mostly because I turned a 15 min trip into a 5 min one. Put them out with a garden hose. It wasted the caliper pistons which required replacement for my next set of pads, but the Brembo solids I had on the car at the time weren't phased in the slightest. 
Wouldn't recommend putting out a brake fire with water if you've got cheap rotors, as they'll warp and crack as soon as you do it. I didn't want to do it myself, I was just pleasantly surprised that it did not warp the fuck out of my rotors when I did it. 
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Quoted: I lit my brakes on fire in my 1G Neon once. Mostly because I turned a 15 min trip into a 5 min one. Put them out with a garden hose. It wasted the caliper pistons which required replacement for my next set of pads, but the Brembo solids I had on the car at the time weren't phased in the slightest. Wouldn't recommend putting out a brake fire with water if you've got cheap rotors, as they'll warp and crack as soon as you do it. I didn't want to do it myself, I was just pleasantly surprised that it did not warp the fuck out of my rotors when I did it. Quoted: Quoted: Quoted: If you aren't tracking your car there is no need. It is for heat dissipation you aren't fading your brakes in stop and go traffic so no need. How many drivers here have had their calipers change color due to heat? Very few, I would wager. I lit my brakes on fire in my 1G Neon once. Mostly because I turned a 15 min trip into a 5 min one. Put them out with a garden hose. It wasted the caliper pistons which required replacement for my next set of pads, but the Brembo solids I had on the car at the time weren't phased in the slightest. Wouldn't recommend putting out a brake fire with water if you've got cheap rotors, as they'll warp and crack as soon as you do it. I didn't want to do it myself, I was just pleasantly surprised that it did not warp the fuck out of my rotors when I did it. LMAO |
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Quoted: Slotted for track. Drilled for looks. The whistles go WOO wooooo Quoted: Quoted: Drilled rotors are for "Look at Me!" attention whores who want to appear baller. 98% of people don't need slotted rotors. Quality blanks with good pads. Emphasis on good pads. Slotted for track. Drilled for looks. The whistles go WOO wooooo Track people are far, far less than 1% - so I think my numbers stick. |
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I've had slotted.drilled rotors on a tracked car, now I just have slotted. Honestly, good pads are where its at. Rotors won't make any difference if you aren't aggressively using BIG brakes. You'd be surprised at some of the pads too, I've used expensive ass pads that didn't have the grip of stock GM ones... Race pads are made with a different shoe compound than street brakes. Race brakes won't work worth a fuck until they are warm, while street pads are designed to work cold, and eventually stop working when you heat them up on a track.
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Quoted: Got any proof of that, preferably backed up by hard facts? Quoted: Quoted: Quoted: Slots help with pad outgassing. Modern pads don't out-gas. Next. Got any proof of that, preferably backed up by hard facts? Lets start here: High Performance Brake Systems, James Walker Jr. Chapter 10: Brake Rotors, Subsection Cross-Drilled Rotors, page 111 Also see: Chapter 9: Brake Pads |
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Quoted: Lets start here: High Performance Brake Systems, James Walker Jr. Chapter 10: Brake Rotors, Subsection Cross-Drilled Rotors, page 111 Also see: Chapter 9: Brake Pads Quoted: Quoted: Quoted: Quoted: Slots help with pad outgassing. Modern pads don't out-gas. Next. Got any proof of that, preferably backed up by hard facts? Lets start here: High Performance Brake Systems, James Walker Jr. Chapter 10: Brake Rotors, Subsection Cross-Drilled Rotors, page 111 Also see: Chapter 9: Brake Pads |