Part Numbers Porsche 997 Gt3 Pistons and brake discs
#16
02-10-2016, 09:02 AM
Thats just the fronts. A 15 mm spacer is all thats needed to make a 350 caliper a 380. The set i found was 350 front and rears
#17
02-10-2016, 10:11 AM
Even if you could use some type of a custom milled adapter to use the 350 calipers with a 380 rotor, your brake bias would be messed up as the 350 calipers have a lot more piston area compared to the 380 versions..
Last edited by pwdrhound; 02-25-2016 at 03:09 PM.
#19
02-10-2016, 11:42 AM
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Join Date: Feb 2011
Location: Lewisville, NC
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So, can you run 997TT 350mm rotors with the stock 996TT caliper (using spacers) on the front and 996 GT2/GT3 350mm rotors with stock 996TT calipers (using spacers) on the rear without an issue?
Later, Steve
Later, Steve
#21
02-10-2016, 02:15 PM
Rob, long story short, I would not mix and match the calipers. It doesn't work well and I would consider it a downgrade over the straight 350/350 system on your car. Porsche got it right on the 997GT cars. It's a good set up.
Last edited by pwdrhound; 02-10-2016 at 02:20 PM.
#22
02-10-2016, 02:15 PM
Join Date: Oct 2010
Location: Germany
Posts: 204
Rep Power: 23 https://store.zeckhausen.com/catalog...ducts_id=15496
Edit
Last edited by b4stiTTS; 02-10-2016 at 09:17 PM.
#23
02-10-2016, 02:28 PM
I would be shocked if you needed to replace the inner pressure seals Bastian. I have 3+ years of heavy track use on my calipers and the seals are perfect while the dust boots disintegrated from heat long ago. The dust boots burn up after only a couple of track days.
#24
02-10-2016, 02:44 PM
Join Date: Oct 2010
Location: Germany
Posts: 204
Rep Power: 23 Those calipers are very clean. I would just use some goo off to clean them up and a little touch up paint. No need to do anything else. There is no heat discoloration. The inner seals are likely good and you can get the dust seals are not included but can be bought directly form the dealer. The part number is in PET, 28/30/32mm are the sizes. For a complete rebuild, Porsche Motorsport sells a factory rebuild kit that includes the pistons, zircon inserts, and seals. 997.351.959.91 is the part number. Dust seals are not included but can be bought directly form the dealer as mentioned above. You need two kits to do a pair of calipers. I would also get the zircon puck retainers from Porsche Motorsport which keep the pucks from falling out. They are very fragile and crack easily. They can not be bought separately.
I assume you already have the 997 rear calipers Bastian? You can not use the 996 versions with these fronts, but you probably already know that.
I assume you already have the 997 rear calipers Bastian? You can not use the 996 versions with these fronts, but you probably already know that.
thank you also for your helpful answer. I bought already the 997 rear calipers, these are unfortunately already a little heat discolored and need a new powdercoat. If I buy the mentioned ones I will try to clean them first and then decide if I'm happy with them.
Price is not bad since the next used ones I know are nearly 1650 $ and new ones start from 1950 $
I want to go with the 380's, not happy with the 350's on the Autobahn on high Speeds. Normally they are enough for the street but not for high Speed, braking, accelerating, braking and so on
#25
02-10-2016, 03:10 PM
Join Date: Oct 2010
Location: Germany
Posts: 204
Rep Power: 23
I checked out PET, These should be the parts(For all 4 Callipers):
Front 380/ 6 pot:
28 mm dust boots: 2 sets(4 pcs.) 951.352.917.00
30 mm dust boots: 2 sets(4 pcs.) 951.352.917.01
32 mm dust boots: 2 sets(4 pcs.) 996.351.915.00
Rear 350/ 4 pot:
34 mm dust boots: 4 sets(8 pcs.) 965.352.917.00
Front 380/ 6 pot:
28 mm dust boots: 2 sets(4 pcs.) 951.352.917.00
30 mm dust boots: 2 sets(4 pcs.) 951.352.917.01
32 mm dust boots: 2 sets(4 pcs.) 996.351.915.00
Rear 350/ 4 pot:
34 mm dust boots: 4 sets(8 pcs.) 965.352.917.00
Last edited by b4stiTTS; 02-10-2016 at 09:15 PM.
#26
02-10-2016, 06:43 PM
I was thinking about the early 997 350/350 (smaller pistons, lower force with 997 front caliper...small bias change relative to rear caliper change, but still a potentially positive change)...the bias issue absolutely makes sense with the later 380mm front disc setup
Think once I kill off my current pads I'll hunt for some (at least rear) 997 calipers. I have to decide if the 380 disc is worth not being able to run factory wheels(or many 18") at all
Thanks,
Rob
Think once I kill off my current pads I'll hunt for some (at least rear) 997 calipers. I have to decide if the 380 disc is worth not being able to run factory wheels(or many 18") at all
Thanks,
Rob
I've tried the 997.2 front calipers with the stock 996GT2 calipers. Rotors were 380/350. I hated the set up as it had heavy front brake bias. It surprised me but I think the reason is the greater fulcrum / torque of the calipers acting on the larger front rotors further out from the center. I swapped in the 997 rear calipers and all was good. The rear 997 calipers have about 50% more piston area than the 996s and as such provide significantly more bite. The 997 pads are also much bigger. I ran 08/11 PFCs and the bias was spot on. When I swapped in the Cup ABS it gave me a touch too much rear bias and I changed to 08/08. It's perfect now. I have the 997 MC and vaccum pump also.
Rob, long story short, I would not mix and match the calipers. It doesn't work well and I would consider it a downgrade over the straight 350/350 system on your car. Porsche got it right on the 997GT cars. It's a good set up.
Rob, long story short, I would not mix and match the calipers. It doesn't work well and I would consider it a downgrade over the straight 350/350 system on your car. Porsche got it right on the 997GT cars. It's a good set up.
#27
02-10-2016, 07:06 PM
I was thinking about the early 997 350/350 (smaller pistons, lower force with 997 front caliper...small bias change relative to rear caliper change, but still a potentially positive change)...the bias issue absolutely makes sense with the later 380mm front disc setup
Think once I kill off my current pads I'll hunt for some (at least rear) 997 calipers. I have to decide if the 380 disc is worth not being able to run factory wheels(or many 18") at all
Thanks,
Rob
Think once I kill off my current pads I'll hunt for some (at least rear) 997 calipers. I have to decide if the 380 disc is worth not being able to run factory wheels(or many 18") at all
Thanks,
Rob
I wouldn't mourn the loss of the oem18s. While beautiful, as you know they are extremely heavy. Several lightweight forged 18x9x12s will clear 380s and save about 30lbs of unsprung mass.
Last edited by pwdrhound; 02-10-2016 at 07:09 PM.
#28
02-10-2016, 07:18 PM
Goodpoint! DOH! Additionally, one would want the GT2/3 caliper (28/30/32) vs the 380mm TT caliper(28/32/36) (vs the 996/997TTsteel(28/32/38)) to gain the greatest bias change.
Just comes down to a budget thing, would be nice to also have the factory wheels as an option to run if needed, vs multiple sets of Finspeed, CCW, etc..
997 Rears might be the gateway drug(like it is needed)...
Cheers,
Rob
Just comes down to a budget thing, would be nice to also have the factory wheels as an option to run if needed, vs multiple sets of Finspeed, CCW, etc..
997 Rears might be the gateway drug(like it is needed)...
Cheers,
Rob
The 997 350 front calipers are identical to the 996 versions, same piston sizes. Only the 997GT 380 fronts have smaller Pistons.
I wouldn't mourn the loss of the oem18s. While beautiful, as you know they are extremely heavy. Several lightweight forged 18x9x12s will clear 380s and save about 30lbs of unsprung mass.
I wouldn't mourn the loss of the oem18s. While beautiful, as you know they are extremely heavy. Several lightweight forged 18x9x12s will clear 380s and save about 30lbs of unsprung mass.
Last edited by 993GT; 02-10-2016 at 07:25 PM.
#29
02-10-2016, 07:21 PM
The 997 350 front calipers are identical to the 996 versions, same piston sizes. Only the 997GT 380 fronts have smaller Pistons.
I wouldn't mourn the loss of the oem18s. While beautiful, as you know they are extremely heavy. Several lightweight forged 18x9x12s will clear 380s and save about 30lbs of unsprung mass.
I wouldn't mourn the loss of the oem18s. While beautiful, as you know they are extremely heavy. Several lightweight forged 18x9x12s will clear 380s and save about 30lbs of unsprung mass.