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Z51 replacement rotor street/track

Old 11-18-2018, 06:09 PM
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BrunoTheMellow
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Default Z51 replacement rotor street/track

Alright so it's about time to replace my front rotors, haven't measured thickness yet but some of the slots are almost gone . I'm at 36k miles and 15-20 track days on my stock set. Carbotech xp10 were my track pad of choice and I feel like they were very good to the rotors. Went through a set of those pads and 2 sets of stock pads, and halfway through 1521s for the street.

Although I do feel some brake fade occasionally when really hooning it, i feel like xp12s would chew my rotor too fast.

Are there any resonably priced rotors that beat the stock rotors in cooling/performance/life? (I had the pre-update z51 rotors).

Otherwise I'm just buying another set of stockers.

Last edited by BrunoTheMellow; 11-18-2018 at 06:10 PM.
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Old 11-18-2018, 06:12 PM
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We have blanks made by DBA to the T3 spec at a good price

https://knsbrakes.com/c/car-series/1...-+Single+Rotor

-Ken
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Old 11-19-2018, 08:22 PM
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Originally Posted by KNSBrakes View Post
We have blanks made by DBA to the T3 spec at a good price

https://knsbrakes.com/c/car-series/1...-+Single+Rotor

-Ken
​​​​​​So how is this different from the 4000 t3 rotor?
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Old 11-20-2018, 03:00 AM
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tmryann
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My buddy runs DBA rotors and I haven't heard any complaints from him. Centric rotors are good also.
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Old 11-20-2018, 10:25 AM
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Thanks. Anyone else have personal track/race experience with any other rotors?
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Old 11-20-2018, 07:16 PM
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in for the knowledge
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Old 11-20-2018, 08:39 PM
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I use DBA5000 on front with the 4000 in the rears on my 2015 z51 for track and street with the DBA 650 pads.
the rotors are great but the pads won’t be enough for the track, I got brake judder from the pads so I have use higher temp pads. I run in the Nürburgring and the gp track here in Germany. Sorry for crappy pics my old phone’s camera was going bad lol



Last edited by Jhanpa4; 11-20-2018 at 09:21 PM.
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Old 11-20-2018, 10:38 PM
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Can you tell the difference from the stock rotors? Yeah those are hardly track pads. Rear pads really.

Last edited by BrunoTheMellow; 11-20-2018 at 10:44 PM.
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Old 11-21-2018, 04:44 AM
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Oh yes you can, with the stock rotors it would take quite a few turns of not hitting brakes hard to get them to cool down at the track and even then they wouldn’t cool down enough, with the 5000s on the front that is almost non existent, I had a problem more with the pads than the rotor itself
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Old 11-21-2018, 10:29 AM
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Just got the kns blank rotors and new xp10 pads. Rotors are cheap so if they aren't up to my abuse, I'll upgrade next go around.
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Old 11-21-2018, 10:56 AM
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Default Running DBA Rotors

Look at the slotted DBA Rotors from Ken. He set me up when I upgraded base rotors and calipers to Z51.

Originally Posted by KNSBrakes View Post
We have blanks made by DBA to the T3 spec at a good price

https://knsbrakes.com/c/car-series/1...-+Single+Rotor

-Ken
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Old 11-21-2018, 11:00 AM
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I ate up a new set of DBA 650 pads in a single day at Dominion Raceway in VA.
Look at the Raybestos ST-43 for the track. (too much for street)
For street I use Powerstop Z26.
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Old 11-21-2018, 02:16 PM
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Hi all I wanted to add some info on the Z51 parts.
On track the car is really hard on the brakes especially the fronts of course - so yeah it's still a Corvette.
Demand on the front rotor seems about to take off based on where we are - 4ish years old in and more and more seeing track use.

GM confused the aftermarket with the 2 piece disc(s) so that may be an issue.

DBA make a one piece version for the front and rear as well as a more conventional 2 piece front disc. Once those were done I released the KNS version. The one piece DBA/KNS are reverse vented which was a DBA design. Based on user results I am considering a change to the design but I have not finished this yet. I would like more track results from the current rotors to see how they stack up.

Centric won't make the 2 piece co-cast style - they catalog it but that is all.


Centric 'placeholder' part number - Z51 front rotor

Since the rear is shared with the base car Centric does have rear rotors


Centric 1 piece rear rotor

Last edited by KNSBrakes; 11-21-2018 at 02:39 PM.
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Old 11-21-2018, 02:37 PM
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As far as DBA pads on track.

XP650 - this is only an entry level pad and should not be worn down thin. It wears fast at the end.

XP735+ - this pad seems to slot in as a mid range track pad - but again if pushed hard it wears fast.

The DBA street pads are fine - moderate dust and medium bite but that's more cheaply made by Powerstop.

At the yearly SEMA show I met with DBA and the pad lineup will change. The SP and XP compounds are changed in AU already to a more robust material that should not wear as fast and they are working on improving the XP+ track pads. This is not a fast process though.

-Ken
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Old 11-21-2018, 02:48 PM
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Thanks for the details Ken. I still would like to know what Are the performance differences on the blanks, 4000 and 5000 slotted rotors. What issues we're reported ?
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Old 11-21-2018, 03:11 PM
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Originally Posted by BrunoTheMellow View Post
Thanks for the details Ken. I still would like to know what Are the performance differences on the blanks, 4000 and 5000 slotted rotors. What issues we're reported ?

The DBA T3 and the KNS blank are the same rotor, same material, same mold, heat treated etc. The DBA is slotted and has the heat strips on the perimeter. The 5000 series is a 2 piece disc so the iron part is completely different.

The issue with the C7 Z51 is just the same thing as the previous gen cars. The brakes are ultimately too small for hard track use so parts life is a challenge. We'd like to eke out as much life as we can because bigger brakes are expensive/require new wheels/against the rules or etc. On the C5 and C6 cars our DBA made blanks are often doubling the life over a store rotor at only a marginal cost difference. That's real value. Part of it is 2-3 less layers of distribution - part of it is it's a performance engineered product not a lower cost copy of the OEM.

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Old 11-21-2018, 03:15 PM
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Originally Posted by KNSBrakes View Post
The DBA T3 and the KNS blank are the same rotor, same material, same mold, heat treated etc. The DBA is slotted and has the heat strips on the perimeter. The 5000 series is a 2 piece disc so the iron part is completely different.

The issue with the C7 Z51 is just the same thing as the previous gen cars. The brakes are ultimately too small for hard track use so parts life is a challenge. We'd like to eke out as much life as we can because bigger brakes are expensive/require new wheels/against the rules or etc. On the C5 and C6 cars our DBA made blanks are often doubling the life over a store rotor at only a marginal cost difference. That's real value. Part of it is 2-3 less layers of distribution - part of it is it's a performance engineered product not a lower cost copy of the OEM.
Great thanks !
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Old 11-21-2018, 03:43 PM
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I know you asked for cost-effective rotors, but I have to chime in that my AP J-hooks are awesome and I run COTA most of the time. I have them in the front using Ferodo DSUNO pads. Expensive, but worth every penny.
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Old 12-02-2018, 10:35 PM
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Hello, not to jack the thread a little but I’m looking for street rotors for my z51 but prefer something better than stock as I do run 680 whp and need to stop fast too! Looks like the DBA 4000 will work for me? Any suggestions on where to get them at a decent price? What specs do I need to look for to make sure they fit my z51?

What about pads? Think I might go with the stock z51 pads. I went with some low dust last time but they sucked for stopping.

thanks!

Last edited by CDH76; 12-02-2018 at 10:42 PM.
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Old 12-02-2018, 11:14 PM
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Originally Posted by CDH76 View Post
Hello, not to jack the thread a little but I’m looking for street rotors for my z51 but prefer something better than stock as I do run 680 whp and need to stop fast too! Looks like the DBA 4000 will work for me? Any suggestions on where to get them at a decent price? What specs do I need to look for to make sure they fit my z51?

What about pads? Think I might go with the stock z51 pads. I went with some low dust last time but they sucked for stopping.

thanks!
Hawk HPS 5.0 are less dusty than the Z51 OEM's but still have good power.

Look at this package

https://knsbrakes.com/c/car-series/1...5.0+Brake+Pads

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