Brake Caliper Sizes ?
07-04-2001, 12:39 PM
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Brake Caliper Sizes ?
What are the specs for the Boxster S versus 996 calipers / discs (diam, piston sizes, thickness). I thought they were the same but the part no's are different.
I currently have 944T calipers on a SC and I am now looking for something for the 2nd SC (front). Boxster calipers are available off the shelf at great prices.
Any takers? Thanks, Tom.
I currently have 944T calipers on a SC and I am now looking for something for the 2nd SC (front). Boxster calipers are available off the shelf at great prices.
Any takers? Thanks, Tom.
07-04-2001, 12:45 PM
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Tom,
If you are only going to use your 2nd SC on the street, Boxster calipers as an upgrade may be OK. For the track, however, there have been reports of the calipers overpowering the 84+ Carrera rotors causing rapidly boiling brake fluid and cracked rotors. One vendor here in the US has stopped offering the upgrade, due to those problems. Again, for just street usage it's probably OK.
If you are only going to use your 2nd SC on the street, Boxster calipers as an upgrade may be OK. For the track, however, there have been reports of the calipers overpowering the 84+ Carrera rotors causing rapidly boiling brake fluid and cracked rotors. One vendor here in the US has stopped offering the upgrade, due to those problems. Again, for just street usage it's probably OK.
07-04-2001, 07:25 PM
#4
Boxster Boxster S
caliper weight ~7 lbs
Frt pistons 38/40 40/36
Rr pistons 30/28 30/28
pad 53x110mm
pad area tot 412cm^2 450cm^2
9 in^2
pad area fr 216cm^2 254cm^2
pad area rr 196cm^2 196cm^2
pad thickness frt 11mm 12mm
pad thickness rr 11mm 10.5mm
frt disk 298x24mm314x25? 318x28mm
rr disks 292x20mm 299x24mm
caliper weight ~7 lbs
Frt pistons 38/40 40/36
Rr pistons 30/28 30/28
pad 53x110mm
pad area tot 412cm^2 450cm^2
9 in^2
pad area fr 216cm^2 254cm^2
pad area rr 196cm^2 196cm^2
pad thickness frt 11mm 12mm
pad thickness rr 11mm 10.5mm
frt disk 298x24mm314x25? 318x28mm
rr disks 292x20mm 299x24mm
07-05-2001, 11:11 AM
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Bill & Bill & Co.
Thanks for the speedy reply. The 2nd "SC" is not for road use. Its a widebody (100% GRP), poly carbon window, lightweight (i.e. fun) car build on a G Series 'tup' with a full cage, coil overs, 3.0 w/carbs, etc.. The project is a BUDGET friendly 911 race car, thus the Boxster S caliper idea. I have about 900kgs (1900lbs?) only to stop, hence the "cheap" brakes might work??? I have plenty of cooling air on this setup.
Thanks for the very direct reply Bill#2. Regards Tom.
Thanks for the speedy reply. The 2nd "SC" is not for road use. Its a widebody (100% GRP), poly carbon window, lightweight (i.e. fun) car build on a G Series 'tup' with a full cage, coil overs, 3.0 w/carbs, etc.. The project is a BUDGET friendly 911 race car, thus the Boxster S caliper idea. I have about 900kgs (1900lbs?) only to stop, hence the "cheap" brakes might work??? I have plenty of cooling air on this setup.
Thanks for the very direct reply Bill#2. Regards Tom.
07-05-2001, 11:25 AM
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Tom,
You might want to contact Steve Weiner, whose email is porsche@rennsportsystems.com, and seek his opinion. He has extensive experience in racing brakes.
You might want to contact Steve Weiner, whose email is porsche@rennsportsystems.com, and seek his opinion. He has extensive experience in racing brakes.
07-05-2001, 11:57 AM
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I race a 914 weighs in at 1900lbs w/3.2ltr that is carb. I have used Boxster calipers w/Carrera rotors for the past three years w/no ill effects. Rear brakes are slightly modified M caliper w/early vented rotors.