Rotors: slotted vs. drilled vs. slotted and drilled

Thread Tools
 
Search this Thread
 
Old 05-24-2014 | 08:33 PM
  #16  
twin_snails's Avatar
twin_snails
Premier Member
iTrader: (2)
 
Joined: Oct 2006
Posts: 1,072
Likes: 178
From: Texas
This information from RacingBrake is pretty insightful. They have a patent on 2-piece rotors that are uniquely slotted and drilled in one shot. I'm running these rotors with their ET500 street pad. The more they heat up, the more ferociously they bite. It's almost like having two brake pad profiles in one. For normal braking, you'd never know they're not stock. However, if you apply the brakes for a few seconds and then get back on them in an aggressive braking situation, they scrub speed in a hurry. Mine only squeak just slightly when I'm at very low speed (i.e. letting off the brakes as you go through the bank drive through).

Technology - RacingBrake.com

They cover the advantages of the slotting/drilling in one step here:

Disc Surface Finish - RacingBrake.com

Advantages:
-Has the advantages of both drilled & slotted rotors
-Allows the disc to expand and contract and prevents the disc from cracking or warping
-Increasing cooling area and retains more friction surface
-Slots relieves thermal stress
-Slots are self cleaning and the pad build up will not clog the slots and are exhausted via the rotor edge keeping the disc surface clean
-Reduces brake pad dust buildup and keeps the wheel clean through vacuum effect
Old 05-24-2014 | 08:47 PM
  #17  
Racindaddy's Avatar
Racindaddy
Registered User
iTrader: (1)
 
Joined: Jun 2013
Posts: 207
Likes: 15
Originally Posted by monytx
I'll say sound, not noise. Using the word noise seems too harsh.
Agreed. Sound. And when it's time to replace the rotors on my G, I will be getting the Stop techs.
Old 05-24-2014 | 11:21 PM
  #18  
lightlypurified's Avatar
lightlypurified
Registered Member
 
Joined: May 2013
Posts: 288
Likes: 24
From: California
I HAVE SLOTTED AND DRILLED ON MINE WITH STOCK AKEBONO BRAKE PADS THEY SQUEEEL LIKE A MUDA,

Name:  CentralCoast-20130815-00206.jpg
Views: 2198
Size:  89.3 KB
Old 05-25-2014 | 08:16 AM
  #19  
monytx's Avatar
monytx
Registered Member
iTrader: (2)
 
Joined: Mar 2013
Posts: 1,140
Likes: 116
From: Houston
Originally Posted by lightlypurified
I HAVE SLOTTED AND DRILLED ON MINE WITH STOCK AKEBONO BRAKE PADS THEY SQUEEEL LIKE A MUDA,

Those Akebono pads though. Did you change the pads when you changed the rotors? Or did you just change rotors?
Old 05-25-2014 | 08:43 PM
  #20  
lightlypurified's Avatar
lightlypurified
Registered Member
 
Joined: May 2013
Posts: 288
Likes: 24
From: California
Originally Posted by monytx
Those Akebono pads though. Did you change the pads when you changed the rotors? Or did you just change rotors?
yes i bought new pads when i installed the rotors i think im going to be getting semi quiet pads on my next brake pad change although there noisy but the stopping power is awesome.
Old 05-25-2014 | 09:31 PM
  #21  
lightlypurified's Avatar
lightlypurified
Registered Member
 
Joined: May 2013
Posts: 288
Likes: 24
From: California
does anybody know if i go with a quieter brake pads that my gripping power of my brakes will be reduced?
Old 05-25-2014 | 09:58 PM
  #22  
warped ideas's Avatar
warped ideas
Thread Starter
A quarter past stripped
 
Joined: Nov 2013
Posts: 1,697
Likes: 374
From: Pembroke Pines, Florida
So many choices....
Old 05-26-2014 | 12:38 AM
  #23  
monytx's Avatar
monytx
Registered Member
iTrader: (2)
 
Joined: Mar 2013
Posts: 1,140
Likes: 116
From: Houston
Originally Posted by lightlypurified
does anybody know if i go with a quieter brake pads that my gripping power of my brakes will be reduced?
I don't think that is necessarily the case. I'm sure there are pads out there that are quiet, yet they provide great stopping power.
Old 05-26-2014 | 09:27 AM
  #24  
Lego_Maniac's Avatar
Lego_Maniac
Registered Member
iTrader: (3)
 
Joined: Aug 2012
Posts: 4,014
Likes: 514
From: Charlotte, NC
blanks>slotted>slotted and drilled

Why people want to take mass away from the rotor, which serves the purpose of a heat sink for the friction created by the pads, is beyond me
Old 05-26-2014 | 09:48 AM
  #25  
GoFightNguyen's Avatar
GoFightNguyen
Because Racecar
iTrader: (14)
 
Joined: May 2013
Posts: 2,543
Likes: 752
From: Houston
Originally Posted by Lego_Maniac
blanks>slotted>slotted and drilled Why people want to take mass away from the rotor, which serves the purpose of a heat sink for the friction created by the pads, is beyond me

There are plenty of reasons. Why do radiators have fins? More surface area dissipates heat better.

The interruption in brake surface helps reduce fade by moving gas/heat/air away from the surface of the rotor. The benefit of slotted over drilled is that slotted rotors do not create a trench all the way through the rotor. Drilled rotors have holes all the way through and are weaker because of it.

Slots reduce mass, which can help with acceleration, rotors are more than just a heat sink, eventually that heat has to go somewhere, and increased surface area helps that.
The following users liked this post:
Bravo at (05-27-2014)
Old 05-26-2014 | 12:28 PM
  #26  
warped ideas's Avatar
warped ideas
Thread Starter
A quarter past stripped
 
Joined: Nov 2013
Posts: 1,697
Likes: 374
From: Pembroke Pines, Florida
Originally Posted by GoFightNguyen
There are plenty of reasons. Why do radiators have fins? More surface area dissipates heat better.

The interruption in brake surface helps reduce fade by moving gas/heat/air away from the surface of the rotor. The benefit of slotted over drilled is that slotted rotors do not create a trench all the way through the rotor. Drilled rotors have holes all the way through and are weaker because of it.

Slots reduce mass, which can help with acceleration, rotors are more than just a heat sink, eventually that heat has to go somewhere, and increased surface area helps that.
Nice way to explain it.
Old 05-26-2014 | 05:43 PM
  #27  
Lego_Maniac's Avatar
Lego_Maniac
Registered Member
iTrader: (3)
 
Joined: Aug 2012
Posts: 4,014
Likes: 514
From: Charlotte, NC
Originally Posted by GoFightNguyen
There are plenty of reasons. Why do radiators have fins? More surface area dissipates heat better.
No good reasons aside from looks. Drilled is a performance downgrade.

Originally Posted by GoFightNguyen
The interruption in brake surface helps reduce fade by moving gas/heat/air away from the surface of the rotor.
Think about what happens when you press your brake pedal. Fluid creates pressure, pushes out the pistons, and the pads come into contact with the rotors, creating friction, and slowing you down.

Drilling a bunch of holes in the rotor means that for the same surface size, there is less surface to create that friction to slow you down.

The front rotors are already vented to let heat escape. Pads haven't generated gas that needs released in a long time.

Originally Posted by GoFightNguyen
The benefit of slotted over drilled is that slotted rotors do not create a trench all the way through the rotor. Drilled rotors have holes all the way through and are weaker because of it.
Slots let water escape. And yes, drilled rotors are weak

Originally Posted by GoFightNguyen
Slots reduce mass, which can help with acceleration, rotors are more than just a heat sink, eventually that heat has to go somewhere, and increased surface area helps that.

Seriously? Slots help with acceleration? You're talking about a pound or three or four.

Again, think about what your brakes do:

1--pads create friction and slow you down. The more rotor, the more contact, the faster you slow down.

2--heat dissapates. The more rotor (ie not drilled) the more mass to absorb the heat

3--rotors cool. It could be argued that drilled rotors help here, but I don't think enough to offset the inherent weakness in drilling, or the compromise to the 1st and 2nd functions of the rotor. You would be better off running some sort of brake cooling ducts.

If you absolutely must have dressed up rotors, slotted are less of a compromise than drilled and slotted.
Old 05-26-2014 | 08:08 PM
  #28  
GoFightNguyen's Avatar
GoFightNguyen
Because Racecar
iTrader: (14)
 
Joined: May 2013
Posts: 2,543
Likes: 752
From: Houston
That's why I have slotted only rotors. There is a definite benefit to buying slotted vs OEM blanks. It's possible that blanks will slow you down faster, but slotted will stand up to repeated braking far better than blanks.
Old 05-26-2014 | 08:35 PM
  #29  
Lego_Maniac's Avatar
Lego_Maniac
Registered Member
iTrader: (3)
 
Joined: Aug 2012
Posts: 4,014
Likes: 514
From: Charlotte, NC
Originally Posted by GoFightNguyen
slotted will stand up to repeated braking far better than blanks.
That's not true.

The benefits to slots is that they can potentially clean the pads. The downside is they are hard on pads and can be noisy.
Old 05-26-2014 | 08:39 PM
  #30  
GoFightNguyen's Avatar
GoFightNguyen
Because Racecar
iTrader: (14)
 
Joined: May 2013
Posts: 2,543
Likes: 752
From: Houston
Originally Posted by Lego_Maniac
That's not true. The benefits to slots is that they can potentially clean the pads. The downside is they are hard on pads and can be noisy.

Coming at this from a different angle, why do most performance cars have slotted rotors?


Quick Reply: Rotors: slotted vs. drilled vs. slotted and drilled



All times are GMT -4. The time now is 12:29 PM.