997.2 GT3 PCCB replacement to oem steel
05-12-2011, 11:41 AM
#16
Rennlist Member
With the replacement rotors that take modified pads (StopTech, Brembo, etc.) it appears that the contact area between the pad and rotor is reduced.. that would mean less sweep area, no? (given the same diameter rotor)
Just curious..
Just curious..
05-12-2011, 11:59 AM
#17
Rennlist Member
No
The modification is to the inner arch of the pad and backing plate so it clears the hat and is tiny... Like a couple seconds on a grinder tiny... Very very easy
The modification is to the inner arch of the pad and backing plate so it clears the hat and is tiny... Like a couple seconds on a grinder tiny... Very very easy
05-12-2011, 06:23 PM
#19
05-12-2011, 10:58 PM
#20
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I spoke to Vivid today, and indeed the pads that accompany the Brembo IIIs appear to be OEM variety. The sales rep called Pagid, who says that the RS29 should fit the front Brembos (997.2 GT3) without grinding; however, 07 GT3 owners did report problems with fitment (as confirmed on this board), and my mechanic says it should not be a big deal if grinding becomes necessary.
Suncoast Porsche and Hennessey Porsche confirm that the OEM steel rotors are not direct replacements for the 997.2 GT3 PCCB rotors (FWIW). The later rep confirmed that some folks have complained regarding the feel of PCCB in everyday driving while most folks love the PCCBs. To quote Fox Mulder, "I want to believe" (but don't).
As it stands, I'm sticking with my initial order from Vivid -- Brembo IIIs and RS29 pads (added the front pads to the order).
Suncoast Porsche and Hennessey Porsche confirm that the OEM steel rotors are not direct replacements for the 997.2 GT3 PCCB rotors (FWIW). The later rep confirmed that some folks have complained regarding the feel of PCCB in everyday driving while most folks love the PCCBs. To quote Fox Mulder, "I want to believe" (but don't).
As it stands, I'm sticking with my initial order from Vivid -- Brembo IIIs and RS29 pads (added the front pads to the order).
05-13-2011, 12:01 AM
#21
Advanced
Only the OEM Drilled Cup disks, Endless Steel Replacement kit, and the AP Kit (Make sure it's the 2010 Endurance or 2011 kit) use the factory Porsche pad with 0 modification. The Cup Car and AP disks are 32 mm thick. Factory PCCB is 380 x 34 front, and 350 x 28 rear. The Endless one is 34 mm thick, not sure about Brembo (I believe 34 mm?).
If I am not mistaken, I have seen factory Cup disks fitted on 997.2 PCCB Calipers. The front rotors are just not as thick as they should be.
The annulus or RD (Radial Depth) is the height of the compound material or the height of the disk (subtract disk's eye diameter from disk's outer diameter and divide by 2).
Sometimes creating a tall annulus disk (63-64 mm like the one factory Porsche pads need) can take special disk molds (which are expensive to make) and excessive manufacturing costs (when compared to the performance difference). Which is why sometimes an existing mold is used to create disk kits and sometimes the pad has to be cut in the inner radius to make it fit.
A thicker disk gives better heat resistance, a taller annulus gives more pad area. This is great for performance, rotor life and taking abuse, at the expense of weight (assuming the iron metallurgy, manufacturing and post-manufacturing processes are all the same of all compared brands).
Short annulus disks are usually lighter.
If I am not mistaken, I have seen factory Cup disks fitted on 997.2 PCCB Calipers. The front rotors are just not as thick as they should be.
The annulus or RD (Radial Depth) is the height of the compound material or the height of the disk (subtract disk's eye diameter from disk's outer diameter and divide by 2).
Sometimes creating a tall annulus disk (63-64 mm like the one factory Porsche pads need) can take special disk molds (which are expensive to make) and excessive manufacturing costs (when compared to the performance difference). Which is why sometimes an existing mold is used to create disk kits and sometimes the pad has to be cut in the inner radius to make it fit.
A thicker disk gives better heat resistance, a taller annulus gives more pad area. This is great for performance, rotor life and taking abuse, at the expense of weight (assuming the iron metallurgy, manufacturing and post-manufacturing processes are all the same of all compared brands).
Short annulus disks are usually lighter.
05-13-2011, 04:50 PM
#24
Wow. That is great news. Thank you very much. I will price these for comparison, but seems like the way to go. I can put the PCCBs on the shelf, and quit worrying about wearing them out on the track.
09-19-2016, 02:30 PM
#28
Rennlist Member
The rear 2010 Turbo rotors work?!?!?!?! Those are only like 250 bucks each!
So you run 997.2 Cup fronts, and 997.2 turbo rears? That will be at least half price
So you run 997.2 Cup fronts, and 997.2 turbo rears? That will be at least half price
