PCCB To Steel Conversion
02-22-2013, 08:48 PM
#16
Burning Brakes
Thread Starter
the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc’s ability to dissipate heat. The curved vane system was developed for racing vehicles where the removal of excess heat is critical for braking system performance."
I'll add new brake ducts to offset the heat, or drive very fast on the straights.
Nick,
I was just doing some research on this.. There are a lot of conflicting opinions about the different rotors. Yes the cross drill eliminate gases better but the slotted are supposed to help remove glaze on the pads. Many race teams use a solid rotor (neither slotted or drilled.)
Many say drillled rotors are just marketing becuase people like the way they look. Of course in racing weight saving is key hence a slotted rotor..
Here is an interesting article that may shed some light on the subject. http://www.surrealmirage.com/subaru/brakes.html
I was just doing some research on this.. There are a lot of conflicting opinions about the different rotors. Yes the cross drill eliminate gases better but the slotted are supposed to help remove glaze on the pads. Many race teams use a solid rotor (neither slotted or drilled.)
Many say drillled rotors are just marketing becuase people like the way they look. Of course in racing weight saving is key hence a slotted rotor..
Here is an interesting article that may shed some light on the subject. http://www.surrealmirage.com/subaru/brakes.html
Exactly reusable hats but I question that as well, I bet you only get 2-3 rotor changes. HAHA I'll put them right next to my new wheels.
02-22-2013, 09:40 PM
#19
Burning Brakes
Thread Starter
Craig see the thread going on the GT forum. There are a few of us already in contact with you, we're waiting on group buy details. Waiting on you!
02-22-2013, 10:11 PM
#21
Burning Brakes
Thread Starter
02-26-2013, 12:40 AM
#22
I am running the 997.2 PCCB calipers with 380mm TT offset slotted floating brake rotors coupled with 350mm TT slotted floating rear brake rotors. Works like a charm. Coleman does not have the ability to make rotors greater than 14.200" as that is the largest blanks they have. 380mm rotors = 15". Brembo makes 380mm front rotors you can use but they do not make 350mm rears to work with the factory Porsche calipers.
The only problem you are going to have if you convert to steel on the 380mm rotors is the fact that nobody makes a steel rotor that has the same width annulus friction surface as the factory PCCB which is around 72mm if I remember correctly. All the steel 380 rotors utilize a 65-66mm annulus width which limits you to a very narrow selection of pads that can be used with the Porsche caliper, specifically the PFC 7819 shape or the Pagid 8004, both of which are only offered in race compounds. There are no street compound pads made in those sizes if that makes a difference. It probably doesn't as most guys that convert to steel with the 380 brakes do it for tracking reasons.
http://www.flickr.com/photos/87731073@N06/8508321495/http://www.flickr.com/photos/87731073@N06/8508321495/ by http://www.flickr.com/people/87731073@N06/, on Flickr
02-26-2013, 01:11 PM
#23
Burning Brakes
Thread Starter
I'm pretty sure he has 380s if he has PCCBs on his 997TT. There are other options out there however.
I am running the 997.2 PCCB calipers with 380mm TT offset slotted floating brake rotors coupled with 350mm TT slotted floating rear brake rotors. Works like a charm. Coleman does not have the ability to make rotors greater than 14.200" as that is the largest blanks they have. 380mm rotors = 15". Brembo makes 380mm front rotors you can use but they do not make 350mm rears to work with the factory Porsche calipers.
The only problem you are going to have if you convert to steel on the 380mm rotors is the fact that nobody makes a steel rotor that has the same width annulus friction surface as the factory PCCB which is around 72mm if I remember correctly. All the steel 380 rotors utilize a 65-66mm annulus width which limits you to a very narrow selection of pads that can be used with the Porsche caliper, specifically the PFC 7819 shape or the Pagid 8004, both of which are only offered in race compounds. There are no street compound pads made in those sizes if that makes a difference. It probably doesn't as most guys that convert to steel with the 380 brakes do it for tracking reasons.
997TT PCCB w steel 380mm rotors by pwdrhound1, on Flickr
I am running the 997.2 PCCB calipers with 380mm TT offset slotted floating brake rotors coupled with 350mm TT slotted floating rear brake rotors. Works like a charm. Coleman does not have the ability to make rotors greater than 14.200" as that is the largest blanks they have. 380mm rotors = 15". Brembo makes 380mm front rotors you can use but they do not make 350mm rears to work with the factory Porsche calipers.
The only problem you are going to have if you convert to steel on the 380mm rotors is the fact that nobody makes a steel rotor that has the same width annulus friction surface as the factory PCCB which is around 72mm if I remember correctly. All the steel 380 rotors utilize a 65-66mm annulus width which limits you to a very narrow selection of pads that can be used with the Porsche caliper, specifically the PFC 7819 shape or the Pagid 8004, both of which are only offered in race compounds. There are no street compound pads made in those sizes if that makes a difference. It probably doesn't as most guys that convert to steel with the 380 brakes do it for tracking reasons.
997TT PCCB w steel 380mm rotors by pwdrhound1, on Flickr
Good info thanks for the post, yes I'm still collecting data on which pads are available/compatible with the Girodisc set up. I don't want to be limited to Pagids, which I hear run "soft" around 50% of their life span. Again, great info thanks.
02-26-2013, 02:07 PM
#24
Been down that road with pads already. Pagid 8003 Cup pads in the RS14, 19, and 29 compounds, and PFC 7819 pads in 01, 06, 08, and 97 compounds are the only pads available that will work with the 65mm annulus Giro 380mm rotors. The Pagid 8003 Cup pads, which many people including myself do not like, have to be lightly "trimmed" at the base to clear the mounting lugs of the aluminum hub. The PFC 7819 pads will clear the hub with about 1/16" to spare. It's really tight and it might not be a bad idea to sand the base of the pad with a belt sander to create a bit more room but so far I have not had any issues. Also, if you use the Pagids, you must use the 8003 pads as they are 17.5mm thick. The 8004 pagids are 19mm thick and would need to be sanded down to fit. Same goes with the PFC7819s. They make a 19mm version and a 17mm thick version. The 19mm is too thick. Hope that helps.
02-26-2013, 02:15 PM
#25
Nordschleife Master
That is great info, thanks as well from me, powdrhound. Would you happen know of fitment issues with the 350mm sized rotors? I'm swapping to girodisc steels for my PCCB equipped boxster spyder (350mm front and back). I'd still like the luxury of using the OEM P40 pads on the street while swapping to PFC08 for the track.
These are the known specs for the PCCB rotors on 987s:
front rotor: 13.8" / 1.3" (350mm x 34mm)
front pad: 17.36 sq-inch (112 cm2)
rear rotor: 13.8" / 1.1" (350mm x 28mm)
rear pad: 9.61 sq-inch (62 cm2)
These are the known specs for the PCCB rotors on 987s:
front rotor: 13.8" / 1.3" (350mm x 34mm)
front pad: 17.36 sq-inch (112 cm2)
rear rotor: 13.8" / 1.1" (350mm x 28mm)
rear pad: 9.61 sq-inch (62 cm2)
02-26-2013, 03:15 PM
#26
That is great info, thanks as well from me, powdrhound. Would you happen know of fitment issues with the 350mm sized rotors? I'm swapping to girodisc steels for my PCCB equipped boxster spyder (350mm front and back). I'd still like the luxury of using the OEM P40 pads on the street while swapping to PFC08 for the track.
These are the known specs for the PCCB rotors on 987s:
front rotor: 13.8" / 1.3" (350mm x 34mm)
front pad: 17.36 sq-inch (112 cm2)
rear rotor: 13.8" / 1.1" (350mm x 28mm)
rear pad: 9.61 sq-inch (62 cm2)
These are the known specs for the PCCB rotors on 987s:
front rotor: 13.8" / 1.3" (350mm x 34mm)
front pad: 17.36 sq-inch (112 cm2)
rear rotor: 13.8" / 1.1" (350mm x 28mm)
rear pad: 9.61 sq-inch (62 cm2)
02-26-2013, 03:43 PM
#27
Burning Brakes
Thread Starter
There are a ton of options for the 350mm Giros. I have run the 350x34 (they are actually 33mm thick from Giro) and the 350x28 Giro rears myself before swithing to the 380s. I do not know what calipers are used on the Boxster however. That will drive what pad you can use. The Giro 350 discs however, have the same width annulus as the 350 PCCB rotors so the same pad shape that was used on the PCCBs can be used on the Giros which gives you a ton of options. Its really only the 380 steel discs that have the pad limitation because every 380 steel disc out there is of the "narrow" annulus variety, whether Brembo, PFC, or Giro. I am not a 100% sure about Alcon. Hope that helps...
02-26-2013, 03:54 PM
#28
I am running the PFC 7819.08s and they fit without any mods but like I said, it's tight. Oh, yeah, and on the 380 steels they are painfully loud. Hopefully once fully bedded in they'll quiet down a bit.... The interesting part is that when I ran the 350 steels with the PFC 08s, they were fairly quiet. Oh well.
02-26-2013, 04:40 PM
#29
Nordschleife Master
There are a ton of options for the 350mm Giros. I have run the 350x34 (they are actually 33mm thick from Giro) and the 350x28 Giro rears myself before swithing to the 380s. I do not know what calipers are used on the Boxster however. That will drive what pad you can use. The Giro 350 discs however, have the same width annulus as the 350 PCCB rotors so the same pad shape that was used on the PCCBs can be used on the Giros which gives you a ton of options. Its really only the 380 steel discs that have the pad limitation because every 380 steel disc out there is of the "narrow" annulus variety, whether Brembo, PFC, or Giro. I am not a 100% sure about Alcon. Hope that helps...
