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.2RS Added Brake Cooling = trackable PCCBs?

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Old 05-08-2018, 07:11 PM
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CDinSing
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Default .2RS Added Brake Cooling = trackable PCCBs?
With the new NACA ducts cooling the brakes will PCCBs stay cool enough to prolong their life at the track making them financially equivalent to iron? Or does it make sense to order iron and upgrade to aftermarket CCBs to get the lighter weight and rebuildablity? If the latter, is there a spring rate difference to manage the lighter weight of PCCBs or are the spring rates the same for iron and PCCB? I know in an interview AP stated track drivers may still want to opt for iron for a lower cost of ownership. Just wondering if the ducts really add enough cooling to shift that cost?
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Old 05-08-2018, 07:17 PM
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Larry Cable
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Originally Posted by CDinSing
With the new NACA ducts cooling the brakes will PCCBs stay cool enough to prolong their life at the track making them financially equivalent to iron? Or does it make sense to order iron and upgrade to aftermarket CCBs to get the lighter weight and rebuildablity? If the latter, is there a spring rate difference to manage the lighter weight of PCCBs or are the spring rates the same for iron and PCCB? I know in an interview AP stated track drivers may still want to opt for iron for a lower cost of ownership. Just wondering if the ducts really add enough cooling to shift that cost?
personally I do not think that PCCBs have ever suffered from cooling issues affecting their usable lifetime... they are far superior "thermally" than iron in that regard.
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Old 05-08-2018, 07:49 PM
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GrantG
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Originally Posted by CDinSing
With the new NACA ducts cooling the brakes will PCCBs stay cool enough to prolong their life at the track making them financially equivalent to iron? Or does it make sense to order iron and upgrade to aftermarket CCBs to get the lighter weight and rebuildablity? If the latter, is there a spring rate difference to manage the lighter weight of PCCBs or are the spring rates the same for iron and PCCB? I know in an interview AP stated track drivers may still want to opt for iron for a lower cost of ownership. Just wondering if the ducts really add enough cooling to shift that cost?
While the brake cooling may help, remember that the car is faster now too. So, the brakes will have more work to do while being better cooled...
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Old 05-08-2018, 07:50 PM
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If you're going to be doing a ton of HPDE events in the car I for one would purchase the AP Racing replacement calipers/pads. Cheaper in the long run no doubt.
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Old 05-08-2018, 07:56 PM
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pccbs are trackable... they are just damn expensive to replace rotors

doubtful more airflow to the brakes will eliminate meaningful pad/rotor wear
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Old 05-08-2018, 10:47 PM
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ipse dixit
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Gen III PCCBs are perfectly fine for the track. As is.
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Old 05-08-2018, 10:56 PM
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Originally Posted by ipse dixit
Gen III PCCBs are perfectly fine for the track. As is.
Agreed. I would love to read a thread about issues with the Gen 3 pccbs on track.
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Old 05-08-2018, 11:45 PM
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TRAKCAR
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You need less cooling for PCCB.
im running about 200F cooler then steel..

even have to go out on higher PSI in front..
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Old 05-08-2018, 11:56 PM
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whatif
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Originally Posted by ipse dixit
Gen III PCCBs are perfectly fine for the track. As is.
Clearly they are perfectly fine for the track. Possibly better than iron due to less unsprung weight.

The question is how long do the rotors last? There doesn't seem to be any meaningful data about that. Not many people are ok with dropping $15K on brakes after some track days.
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Old 05-09-2018, 12:01 AM
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TRAKCAR
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you can swap to ST rotors like I did. PCCB replacement is about $25K, not 15K AFAIK.
ST are 12K but the rears should last forever.

Fronts should be OK for 5 refurbishments and 20+ track days in between the refurbs. Refurb is $500 per corner.
I'm on day 12 of being very hard on the brakes...
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Old 05-09-2018, 12:10 AM
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whatif
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Originally Posted by TRAKCAR
you can swap to ST rotors like I did. PCCB replacement is about $25K, not 15K AFAIK.
ST are 12K but the rears should last forever.

Fronts should be OK for 5 refurbishments and 20+ track days in between the refurbs. Refurb is $500 per corner.
I'm on day 12 of being very hard on the brakes...
That's good to know. Would you say the wear rate for OEM PCCB rotors would be similar to that (+/- 20 track days)?
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Old 05-09-2018, 12:13 AM
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TRAKCAR
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I don’t know.
But once your track PCCB it’s harder to quantify their value then the ST’s
of course if you shelve the PCCB, that’s not an issue.
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Old 05-09-2018, 12:16 AM
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ipse dixit
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For what it's worth, I know of a 991.1 GT3 owner with PCCBs who has gone through more engines (3) than OEM ceramic rotors (0)

Probably a good 20+ days of track time.
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Old 05-09-2018, 12:17 AM
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He never had a chance to use the PCCB’s LOL.
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Old 05-09-2018, 12:21 AM
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Does the surface cracking get much worse over time? These pictures are basically a new car (300 miles), and the cracks are starting to show.



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