Part Numbers Porsche 997 Gt3 Pistons and brake discs
#61
06-08-2016, 11:53 AM
Should have pinged me two weeks ago. Had a complete set of 4 yellows off a 6GT3. They went quick...
#63
06-08-2016, 07:44 PM
Yes, those are the correct pads for the full annulus rotors. You need 17mm front pads for a 34mm rotor. 18mm pads work on the rear brakes.
#64
06-08-2016, 09:41 PM
Join Date: Oct 2010
Location: Germany
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So same brake pad Surface Area than on the 350mm 6 pots. Just all the other benefits. longer lever in case of the bigger outer rotor diameter, different piston Design for the calipers, more cooling area from the rotors, more cooling vanes, more rotor/ brake Surface and so on....
Last edited by b4stiTTS; 06-08-2016 at 09:51 PM.
#65
06-18-2016, 04:42 PM
can go 350mm to 380mm
I'll say it again, YOU CAN NOT USE 997TT OR 996GT2/3 FRONT CALIPERS with 380mm rotors, only 350mm. The RB kit is flawed. Look at the pictures of the front set up in the link you provided. Due to the fact that the caliper uses an offset mount and spaces out at an angle (rather than radially), as a result the caliper & pad will not line up properly with the rotor. They show a close up picture of it (show below) and even admit it in their link:
"After installing front rotors, spacers, calipers, and pads will naturally overhang the rotor top by about 2-3mm due to geometrical configuration, however this excessive lining can be easily removed with a dremel or grinder."
[url=https://flic.kr/p/D3WsNC]
First of all, there is nothing "natural" about brake pads overhanging the rotor. It's actually more like 1/4" overhang and due to the "geometric configuration" gets more exaggerated on the far end which is not visible in their picture. Look at the pad and you can see how it sits at an angle with respect to the rotor. Total BS. If they showed you a picture of the caliper mounted up with the spacers, you would see a large gap between the rotor and caliper at the top end and virtually touching at the lower end. The 350 caliper design does not lend itself to being spaced out. Period. The RB stuff is cheaply made and their lack of proper engineering should be a warning sign to stay away. Use reputable rotors make by Girodisc, Brembo, AP racing, or stick with OEM.
When running 380s in the front you will need to run 997 rear calipers. They have larger pistons and move almost 50% more fluid. The byproduct of this will be a softer pedal. As such all the 997TT/GT cars have the larger 27mm MC to firm up the pedal. You can retrofit the larger MC to the 996TT with the use of a custom brake line. The larger MC sometimes causes PSM faults however. Disconnecting PSM takes care of the issue. Hope that helps.
"After installing front rotors, spacers, calipers, and pads will naturally overhang the rotor top by about 2-3mm due to geometrical configuration, however this excessive lining can be easily removed with a dremel or grinder."
[url=https://flic.kr/p/D3WsNC]
First of all, there is nothing "natural" about brake pads overhanging the rotor. It's actually more like 1/4" overhang and due to the "geometric configuration" gets more exaggerated on the far end which is not visible in their picture. Look at the pad and you can see how it sits at an angle with respect to the rotor. Total BS. If they showed you a picture of the caliper mounted up with the spacers, you would see a large gap between the rotor and caliper at the top end and virtually touching at the lower end. The 350 caliper design does not lend itself to being spaced out. Period. The RB stuff is cheaply made and their lack of proper engineering should be a warning sign to stay away. Use reputable rotors make by Girodisc, Brembo, AP racing, or stick with OEM.
When running 380s in the front you will need to run 997 rear calipers. They have larger pistons and move almost 50% more fluid. The byproduct of this will be a softer pedal. As such all the 997TT/GT cars have the larger 27mm MC to firm up the pedal. You can retrofit the larger MC to the 996TT with the use of a custom brake line. The larger MC sometimes causes PSM faults however. Disconnecting PSM takes care of the issue. Hope that helps.
They just require a very small amount of material carefully removing from the bottom area to clear the larger rotor.
I have to agree that the 'wedge' spacer idea from a certain dealer is bonkers, as you say, bolts are not 90 degrees to holes = stress
Have a read of this
http://911uk.com/viewtopic.php?t=111972&highlight=
#66
06-18-2016, 05:26 PM
380mm aftermarket rotors such as brembo, girodisc or alcon can be installed with the 997.1 turbo calipers,onto a 996 Turbo.
They just require a very small amount of material carefully removing from the bottom area to clear the larger rotor.
I have to agree that the 'wedge' spacer idea from a certain dealer is bonkers, as you say, bolts are not 90 degrees to holes = stress
Have a read of this
http://911uk.com/viewtopic.php?t=111972&highlight=
They just require a very small amount of material carefully removing from the bottom area to clear the larger rotor.
I have to agree that the 'wedge' spacer idea from a certain dealer is bonkers, as you say, bolts are not 90 degrees to holes = stress
Have a read of this
http://911uk.com/viewtopic.php?t=111972&highlight=
#67
06-18-2016, 05:49 PM
380mm aftermarket rotors such as brembo, girodisc or alcon can be installed with the 997.1 turbo calipers,onto a 996 Turbo.
They just require a very small amount of material carefully removing from the bottom area to clear the larger rotor.
I have to agree that the 'wedge' spacer idea from a certain dealer is bonkers, as you say, bolts are not 90 degrees to holes = stress
Have a read of this
http://911uk.com/viewtopic.php?t=111972&highlight=
They just require a very small amount of material carefully removing from the bottom area to clear the larger rotor.
I have to agree that the 'wedge' spacer idea from a certain dealer is bonkers, as you say, bolts are not 90 degrees to holes = stress
Have a read of this
http://911uk.com/viewtopic.php?t=111972&highlight=
If only that make the 350 6 pistons with normal mounts instead of angled ones
#68
06-19-2016, 11:40 AM
Cutting on the bridge, which takes huge amounts of stress, does seem pretty crazy. Plus as pointed out the caliper position isn't extended, there's no additional leverage exerted on the rotor is there? Doesn't this keep the pads in the same position?
Thinking out loud... any other platforms share Brembo calipers with us that might have the desired spacing? Honestly as John points out is the advantage that great? Heavier per corner and makes wheel selection even harder I'd imagine. With proper venting are the 350mm overheating? Aren't they enough to lock wheels anyway? I'd begin to wonder if the ABS could handle a 50mm change in ability or are folks disabling it for track use? PSM uses a different computer? Sorry, not dug into this system much and hope not to lol!
Thinking out loud... any other platforms share Brembo calipers with us that might have the desired spacing? Honestly as John points out is the advantage that great? Heavier per corner and makes wheel selection even harder I'd imagine. With proper venting are the 350mm overheating? Aren't they enough to lock wheels anyway? I'd begin to wonder if the ABS could handle a 50mm change in ability or are folks disabling it for track use? PSM uses a different computer? Sorry, not dug into this system much and hope not to lol!
#69
06-19-2016, 12:16 PM
Porsche designed a new caliper for the 380s for a reason. The 380 GT caliper has roughly 30% SMALLER pistons (than 997TT/GT calipers) which keeps the front brake bias from getting greater as you increase the fulcrum. That in and of itself is one reason you don't want to use the 996 350 caliper with 380 rotors.
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