Slotted or Slotted and Dimpled
Thread Starter
Instructor
Joined: May 2009
Posts: 154
Likes: 0
From: New Smyrna Bch. Fl
Slotted or Slotted and Dimpled
Looking to replace my rotors on 06 Z51 and I am not a big fan of cross-drilled rotors. My question is: Should I get the slotted or slotted and dimpled? Is there a big difference between the two or are we getting into the whole 'looks good' scenario? If the dimples are just cosmetic then I will pass but if they make a significant performance gain then I will definitely get slotted and dimpled. Any suggestions would be appreciated. Thanks!
Last edited by KVA_Dave; Jun 17, 2009 at 02:12 PM.
Racer
Joined: May 2008
Posts: 422
Likes: 6
From: Boca Raton Florida
They also help remove gas and pad residue and look cool. Plus everyone has solid rotors.
I personally like the scallops that PFC/Racing Brake has in there rotors, plus they are tuff.
After market companies are making upgrades for the z51 that are very good, go to a two piece hat if you can afford to, in one piece I think brembo make a replacement or DBA.
I personally like the scallops that PFC/Racing Brake has in there rotors, plus they are tuff.
After market companies are making upgrades for the z51 that are very good, go to a two piece hat if you can afford to, in one piece I think brembo make a replacement or DBA.
Burning Brakes
Joined: Jun 2008
Posts: 1,214
Likes: 3
From: CA
I think cross drilled rotors do make a difference and are not only for looks.
Years ago I had a 4th gen Z28 and did not want to spend the money on cross drilled rotors simply because...well I was just broke then. LOL So I bought a pair of stock replacement rotors from Kragen and decided to do a test. I drew out a pattern of holes on some construction paper and then once I had a pattern I marked and drilled all my holes on only one rotor. I believe it was the psgr side.
Anyways, I drove the car for about 3 months with only ONE crossed drilled rotor (it looked retarded, i know) and after that I took apart the brakes and guess what....to my suprise the pads on the cross drilled rotor had more life than the pads on the rotor without the holes.
Now as far as performance gains, that i don't know. But I can tell you this...the brakes do run cooler. I don't know if they work better than other designs but just thought I'd share this info.
Years ago I had a 4th gen Z28 and did not want to spend the money on cross drilled rotors simply because...well I was just broke then. LOL So I bought a pair of stock replacement rotors from Kragen and decided to do a test. I drew out a pattern of holes on some construction paper and then once I had a pattern I marked and drilled all my holes on only one rotor. I believe it was the psgr side.
Anyways, I drove the car for about 3 months with only ONE crossed drilled rotor (it looked retarded, i know) and after that I took apart the brakes and guess what....to my suprise the pads on the cross drilled rotor had more life than the pads on the rotor without the holes.
Now as far as performance gains, that i don't know. But I can tell you this...the brakes do run cooler. I don't know if they work better than other designs but just thought I'd share this info.
Safety Car
Joined: Sep 2007
Posts: 4,359
Likes: 6
From: Los Alamitos California
St. Jude Donor '09
I think cross drilled rotors do make a difference and are not only for looks.
Years ago I had a 4th gen Z28 and did not want to spend the money on cross drilled rotors simply because...well I was just broke then. LOL So I bought a pair of stock replacement rotors from Kragen and decided to do a test. I drew out a pattern of holes on some construction paper and then once I had a pattern I marked and drilled all my holes on only one rotor. I believe it was the psgr side.
Anyways, I drove the car for about 3 months with only ONE crossed drilled rotor (it looked retarded, i know) and after that I took apart the brakes and guess what....to my suprise the pads on the cross drilled rotor had more life than the pads on the rotor without the holes.
Now as far as performance gains, that i don't know. But I can tell you this...the brakes do run cooler. I don't know if they work better than other designs but just thought I'd share this info.
Years ago I had a 4th gen Z28 and did not want to spend the money on cross drilled rotors simply because...well I was just broke then. LOL So I bought a pair of stock replacement rotors from Kragen and decided to do a test. I drew out a pattern of holes on some construction paper and then once I had a pattern I marked and drilled all my holes on only one rotor. I believe it was the psgr side.
Anyways, I drove the car for about 3 months with only ONE crossed drilled rotor (it looked retarded, i know) and after that I took apart the brakes and guess what....to my suprise the pads on the cross drilled rotor had more life than the pads on the rotor without the holes.
Now as far as performance gains, that i don't know. But I can tell you this...the brakes do run cooler. I don't know if they work better than other designs but just thought I'd share this info.
Drilled rotors are for looks, and only for looks for those that don't know any better IMHO.
San
Burning Brakes
Joined: Dec 2004
Posts: 882
Likes: 0
From: St. Augustine Fl
Your pads were less worn because there was less rotor surface area for them to grab and wear against. I also doubt that your "drilled" rotor ran any cooler. Good thing you never did any serious braking on a home drilled cheap rotor, because the results could have been dangerous.
Drilled rotors are for looks, and only for looks for those that don't know any better IMHO.
San
Drilled rotors are for looks, and only for looks for those that don't know any better IMHO.
San
i gotta use that one
Safety Car
Joined: Sep 2007
Posts: 4,359
Likes: 6
From: Los Alamitos California
St. Jude Donor '09
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Burning Brakes
Joined: Jun 2008
Posts: 1,214
Likes: 3
From: CA
Your pads were less worn because there was less rotor surface area for them to grab and wear against. I also doubt that your "drilled" rotor ran any cooler. Good thing you never did any serious braking on a home drilled cheap rotor, because the results could have been dangerous.
Drilled rotors are for looks, and only for looks for those that don't know any better IMHO.
San
Drilled rotors are for looks, and only for looks for those that don't know any better IMHO.
San
It was just an experiment guys and nothing more. Don't get your panties in a knot now.
Intermediate
Joined: Dec 2008
Posts: 49
Likes: 0
From: South Riding Va
Dimpling, cross-drilling, and slotting all serve a purpose. The question is are you going to employ your Vette to the extent that they will come into play?
They all help protect against outgassing. This happens when the pad reaches high temperatures causing the bonding agents in the pad material to vaporize (note:Modern performance pads use different bonding methods and are much less susceptible to outgassing). For more detail visit this site:
http://www.baer.com/technical/faq/index.php
Keep in mind that cross drilling can lead to stress fractures in your rotors.
Happy Motoring
They all help protect against outgassing. This happens when the pad reaches high temperatures causing the bonding agents in the pad material to vaporize (note:Modern performance pads use different bonding methods and are much less susceptible to outgassing). For more detail visit this site:
http://www.baer.com/technical/faq/index.php
Keep in mind that cross drilling can lead to stress fractures in your rotors.
Happy Motoring
Last edited by tdbowen; Jun 18, 2009 at 09:24 AM.
Racer
Joined: May 2008
Posts: 422
Likes: 6
From: Boca Raton Florida
Brake like all technology get more advances with time, drilled rotor if done correctly are fine notice that the factory z51 have not just drilled holes but they are chamfored holes which is better than just drilled. Also notice that real full floating rotors some times are drilled or slotted and have micro/ hair line cracks and are fine, my PFC race rotors were this way and as long as the crack is not large, ie you finger nail can not catch on it.
Last edited by LS3FORME; Jun 18, 2009 at 10:37 AM.
