Upgrade to 997 turbo brakes
#61
my post was not clear. first question is the 997 turbo from rotor the same as the 996 gt2 front rotor, the same question for the back. also is the gt2 back caliper the same as the c4s back caliper except for a built in 10 mm space to accomadate the 350x 28 rotors?
#62
I do not have any knowledge about C4S's rear calipers, but a wild guess is that while C4S has the same brakes than a turbo, rear calipers will equal turbos' ones and thus also GT2's.
#63
I have 997 Turbo discs and calipers front and rear on my 996T. They are a complete bolt on and give you you larger 350mm discs and 6 pot front calipers. The fronts are the size as the 996 GT2/3 but have a 2mm different offset.
There are 2 ways to do this:
1. get 350mm rotors and get the Vivid caliper spacer so that you can run your stock front/rear calipers on the larger discs
2. Retrofit the entire 997 Turbo front/rear brake setup to the 996T. Make sure you use the bolts that come from the 997T since they are longer than the factory 996 caliper bolts.
I find that the entire 997 system works very well, but due to increased hydraulic requirement the brake pedal needs ever so much more travel. You can get around this by
1. Sticking to the vivid setup that uses stock calipers with larger discs.
2. Upgrade just the front calipers/discs (the 6 GT2 and GT3 use the same master cylinder as the turbo) so that should work great.
3. Upgrade to the 997 brake setup all around and maybe haven't looked into this yet, upgrade the brake master cylinder to the 997 model?
There are 2 ways to do this:
1. get 350mm rotors and get the Vivid caliper spacer so that you can run your stock front/rear calipers on the larger discs
2. Retrofit the entire 997 Turbo front/rear brake setup to the 996T. Make sure you use the bolts that come from the 997T since they are longer than the factory 996 caliper bolts.
I find that the entire 997 system works very well, but due to increased hydraulic requirement the brake pedal needs ever so much more travel. You can get around this by
1. Sticking to the vivid setup that uses stock calipers with larger discs.
2. Upgrade just the front calipers/discs (the 6 GT2 and GT3 use the same master cylinder as the turbo) so that should work great.
3. Upgrade to the 997 brake setup all around and maybe haven't looked into this yet, upgrade the brake master cylinder to the 997 model?
#64
PETE--- thank you for the inflormation: if i read you corectly i could use the gt2 calipers all the way around (bolt on/without mods). i could use the gt2 rear rotors with out any fitmnet issues but would either have to get the 997 turbo ft rotors or use the gt2 with the 2 mm spacers behind the hats. is this correct? the brakek peddle would have slightly more travel because of the 6 pots up front? thank you again
#68
4-piston calipers from 996 turbo and 6-piston caliper from a GT2 ( or GT3 or 997 turbo ) have exact the same piston area and thus the same volume, it's just divided in a larger effective pad area in 6-piston caliper.
The same main cylinder will do the job just fine.
#69
PETE--- thank you for the inflormation: if i read you corectly i could use the gt2 calipers all the way around (bolt on/without mods). i could use the gt2 rear rotors with out any fitmnet issues but would either have to get the 997 turbo ft rotors or use the gt2 with the 2 mm spacers behind the hats. is this correct? the brakek peddle would have slightly more travel because of the 6 pots up front? thank you again
GT2 / GT3 mkII rear discs.
997 turbo front discs.
OEM master cylinder, if it has the same #number than turbo's one ( if you're planning to upgrade a C4S ). I did the upgrade to my C2 with following parts:
997 turbo calipers, pads and discs ( at front with 1.5mm spacer )
996 turbo MC ( C2's own is smaller ) and booster
996 GT2/3 front wheel carriers
Braided stainless hoses, Motul M600 brake fluid etc
Yes, that's correct.
#70
pete
the c4s master cylinder must be smaller also? do you need the 1.5 mm spacer on a c4s 997 , if you use 997 rotors? are you sure you can use 996 gts back rotors on a 997 c4s? thanks in advance mike, did you get the 997 rotors from porsche? do other people sell 997 rotors , i dont race the car just street use (example vertex)
the c4s master cylinder must be smaller also? do you need the 1.5 mm spacer on a c4s 997 , if you use 997 rotors? are you sure you can use 996 gts back rotors on a 997 c4s? thanks in advance mike, did you get the 997 rotors from porsche? do other people sell 997 rotors , i dont race the car just street use (example vertex)
#72
This is accurate from what I've read. However the 997T rear calipers utilize larger pistons and thus afffect pedal travel.
I have this setup on my car. You will feel a slightly spongier pedal with more travel. One simple fix is to upgrade only the fronts.
I have this setup on my car. You will feel a slightly spongier pedal with more travel. One simple fix is to upgrade only the fronts.
Not correct.
4-piston calipers from 996 turbo and 6-piston caliper from a GT2 ( or GT3 or 997 turbo ) have exact the same piston area and thus the same volume, it's just divided in a larger effective pad area in 6-piston caliper.
The same main cylinder will do the job just fine.
4-piston calipers from 996 turbo and 6-piston caliper from a GT2 ( or GT3 or 997 turbo ) have exact the same piston area and thus the same volume, it's just divided in a larger effective pad area in 6-piston caliper.
The same main cylinder will do the job just fine.
Last edited by Turbo Fanatic; 04-13-2011 at 01:49 AM.
#73
Ari you're correct, it seems that 996 turbo's rear calipers have 30 & 28mm pistons while 997 turbo has 2x 34mm pistons, that's significant difference.
Technical manual should state the size of main cylinder, 996 turbo's one is 25.4mm for both front & rear, stroke is 18mm.
Technical manual should state the size of main cylinder, 996 turbo's one is 25.4mm for both front & rear, stroke is 18mm.
Thread
Thread Starter
Forum
Replies
Last Post
PelicanParts.com
GT3/GT2/GT Vendor Classifieds
0
08-20-2015 02:37 PM
PelicanParts.com
GT3/GT2/GT Vendor Classifieds
0
08-18-2015 03:42 PM
PelicanParts.com
997 Turbo Vendor Classifieds
0
08-18-2015 03:41 PM
PelicanParts.com
997 Vendor Classifieds
0
08-18-2015 03:39 PM