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#16
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Re: Front brake up grade to Wilwood 4 pot
Group Buy!!!
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Tranny goes in, tranny comes out, tranny goes in.....AW ****, tranny comes out.... |
#17
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Re: Front brake up grade to Wilwood 4 pot
I would be "In" if our Aussie friend feels like it. That .39" bolt you mentioned would fit the Wildwood caliper better..?..is the caliper threaded for what size ?
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#18
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Re: Front brake up grade to Wilwood 4 pot
Tony
Looking over the .pdf file and it looks like it might be (?) missing one or two other dimensions needed for someone else to machine up the spacers? If I took a rectangular piece of 10mm 1040, where would I reference the hole locations from? Cheers, Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#19
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Re: Front brake up grade to Wilwood 4 pot
Have removed
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. Last edited by Dessertrunner; 09-26-2013 at 12:32 PM. |
#20
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Re: Front brake up grade to Wilwood 4 pot
Quote:
So the SVX has 8sq”, and the Wilwood has 9.6sq”, an increase of 20%. The big benefit is that the higher pressure is applied equally to both sides of the disk, instead of piston pressure to one side and caliper pressure to the other side, the opposing pistons can freely follow a warped disc. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#21
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Re: Front brake up grade to Wilwood 4 pot
Have removed
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. Last edited by Dessertrunner; 09-26-2013 at 12:32 PM. |
#22
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Re: Front brake up grade to Wilwood 4 pot
Quote:
In the Wilwood only the piston area applies pressure to the disc, the back of the cylinder is fixed, so it applies no pressure to the disc. In the SVX both ends of the hydraulic cylinder, the piston on one side of the disc, and the back of the cylinder, which is connected to the opposite side of the disc, applies pressure to the disc. So both 2” ends of the SVX cylinder apply pressure to the disc. Only one end of the Wilwood cylinder can apply pressure to the disc. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#23
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Re: Front brake up grade to Wilwood 4 pot
Have removed
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. Last edited by Dessertrunner; 09-26-2013 at 12:32 PM. |
#24
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Re: Front brake up grade to Wilwood 4 pot
The major difference being between a fixed caliper and a floating caliper design. In a floating caliper the caliper itself moves which is what applies force to the opposite side of the disc. This is caused by pressure being applied to the caliper itself inside of the piston bore. So in a floating caliper pressure is applied to the rotor on one side by the force on the back of the piston, and on the other side by the force on the caliper.
In a fixed caliper design the caliper itself cannot move. So there needs to be pistons on both sides to apply force to both sides of the rotor. One side of the rotor gets force by pressure applied to the back of the pistons on that side, and the other side gets force from pressure applied to the back of the pistons on that side. The force on the caliper does not apply any pressure to the rotor. To use the example with hydraulic rams you would need to set it up differently. To equal a fixed caliper brake system you would need two rams opposite eachother mounted to fixed, unmoveable points, pressing on an item in the middle, call it X. In this there would only be forces on the pistons pressing on X. To equal the floating caliper system, you would have one ram which is mounted to a moveable plate. The piston of the ram would press on one side of X, and the moveable plate would press on the other side of X. In this setup you have force pressing on the piston in one direction, and on the base of the ram in the other direction because the ram can move on its mounting plate. |
#25
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Re: Front brake up grade to Wilwood 4 pot
Yehhhhhh.
Could not have said it better. Harvey.
__________________
One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#26
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Re: Front brake up grade to Wilwood 4 pot
Have removed
__________________
1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. Last edited by Dessertrunner; 09-26-2013 at 12:31 PM. |
#27
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Re: Front brake up grade to Wilwood 4 pot
The rotor is a fixed piece. You need force on both sides of it to make the car stop. In a fixed caliper system you have pistons on both sides that give the pressure needed. In a floating caliper design the pistons are only on one side of the rotor. Something has to give force onto the other side of the rotor for the system to work. The pressure on the pistons is also pressing the caliper away from them causing that force to be transmitted to the opposite side of the rotor. There is a force on the back of the piston pressing into the rotor, and there is another equal force on the caliper pushing it away from the piston pressing on the other side of the rotor. If a floating caliper was fixed, it would only apply force to one side of the rotor which would not give the clamping action needed to stop the vehicle because the rotor is fixed. There has to be a second force active to get the clamping pressure needed on the fixed rotor to make it stop.
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#28
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Re: Front brake up grade to Wilwood 4 pot
Calculate the forces from a given pressure, make a drawing and see how the forces act.
Harvey is correct. /T |
#29
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Re: Front brake up grade to Wilwood 4 pot
Have removed
__________________
1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. Last edited by Dessertrunner; 09-26-2013 at 12:31 PM. |
#30
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Re: Front brake up grade to Wilwood 4 pot
Quote:
As I said before, “ The big benefit is that the higher pressure is applied equally to both sides of the disk, instead of piston pressure to one side and calliper pressure to the other side, the opposing pistons can freely follow a warped disc.” The sliding calliper is really medieval, it only has price as its benefit. It only works well when new, then the slide pins freeze up and the frame distorts. Any movement of the disc on the hub will push the piston back, not move the slides. With the opposed piston set, it only has to move fluid from one side to the other, so it can follow the disc regardless of any hub, frame flexing or movement of the disc. A far superior set-up. Tony did you weigh the two sets to see if there is a reduction in unsprung weight? Harvey.
__________________
One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
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