View Poll Results: PCCB or Steel Brakes on your 991 GT3?
PCCBs, the car is for street driving only.
150
22.76%
PCCBs, and I'll track it that way too.
148
22.46%
PCCB, but buying steel rotors or system for track.
44
6.68%
Steel brakes, it's the way I roll.
317
48.10%
Voters: 659. You may not vote on this poll
PCCB or Steel on your 991 GT3?
08-03-2014, 03:01 PM
#166
Race Director
Looking again at the diagrams I posted, it appears the bolt locations are the same (meaning located the same distance away from the outer perimeter) and I am wondering if the calipers are indeed the same but the pads are simply wider? Perhaps there is more room than needed for the steels and just enough for the PCCBs? But wouldn't it make sense for the pistons to hit exactly midway between the inner and outer perimeters? Need an engineer's perspective. Mike?
Even assuming a minor change in the internal configuration of the caliper the outside dimensions appear pretty much identical. We're talking about relatively light weight aluminum pieces. It's just hard to imagine minor internal changes having much affect on weight.
08-03-2014, 03:09 PM
#167
Sam, I was just going to post exactly that; the PCCB and CI pads do seem to share mounting points and length, while the PCCB pads are 8mm wider, most of which appears to be where the pad further overlaps the backing plate. It would take a very minor adjustment (4mm) to center the pistons over the pad, and could likely be accommodated within the overall dimension of the caliper.
Even assuming a minor change in the internal configuration of the caliper the outside dimensions appear pretty much identical. Also, we're talking about relatively light weight aluminum pieces. It's just hard to imagine minor internal changes having much affect on weight.
Even assuming a minor change in the internal configuration of the caliper the outside dimensions appear pretty much identical. Also, we're talking about relatively light weight aluminum pieces. It's just hard to imagine minor internal changes having much affect on weight.
08-03-2014, 03:13 PM
#168
Some photo mashups (my highly unscientific method) to judge for yourself. To me, they suggest the calipers look like they're also positioned further outwards (away from centre) on the PCCB rotors than the steels, but the calipers otherwise appear to be the same externally.
EDIT: oops, late to the party while I was typing and uploading photos... covered already
EDIT: oops, late to the party while I was typing and uploading photos... covered already
Last edited by <3mph; 08-03-2014 at 03:21 PM. Reason: late
08-03-2014, 03:30 PM
#169
Nordschleife Master
It does look like the calipers are the same. Good news for those of us that didn't option PCCB. Always nice to have larger calipers for the heat capacity.
08-03-2014, 03:33 PM
#170
Race Director
08-03-2014, 03:41 PM
#171
08-03-2014, 03:55 PM
#174
Racer
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08-03-2014, 04:20 PM
#175
Burning Brakes
08-03-2014, 04:23 PM
#176
Nordschleife Master
08-06-2014, 01:32 PM
#177
Burning Brakes
Actually there goes the theory that the PCCB calipers are larger and therefore offset the 40 lbs unsprung weight advantage. Looks like its gonna be a true 40 lbs difference, which I think is more than worth $9200 for this type of a car.
