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  #31  
Old 09-18-2013, 06:24 PM
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Re: Front brake up grade to Wilwood 4 pot

Quote:
Originally Posted by Dessertrunner View Post
Okay Harvey it seems I have to eat hubble pie, you are correct, you would think us young guys would know better then to challange you older guys.
Harvey is immortal but tireiron is only 31, glad you worked it out though
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92 pearl SVX about to revive
92 Black 4ws (Jap spec) SVX
93 black SVX
93 Liquid Silver SVX - sti 6 speed with R180 diff, my05 sti steering wheel, sti alloy lateral links, 19x8.5 275/30 42mm offset front and 19x8.5 275/30 22mm offset on the rear, 6 pot brembo caliper with 355 rotors front, 2 pot brembos rear
95 bright red SVX
96 emerald pearl SVX about to revive
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  #32  
Old 09-18-2013, 08:54 PM
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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 12:31 PM.
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  #33  
Old 09-18-2013, 09:48 PM
bazza bazza is offline
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Re: Front brake up grade to Wilwood 4 pot

Something else worth getting is the STI brake master cylinder and pedal setup. The pedal length and the cylinder diameter all change the feel and bite of the brakes. If you can get the SVX to bite like a GDB+ STI (2002 onwards) you are in for one heck of a fun ride! On hard braking they will lift the rears off the ground and throw you through the windscreen!!
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  #34  
Old 09-19-2013, 06:11 AM
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Re: Front brake up grade to Wilwood 4 pot

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Originally Posted by Dessertrunner View Post
Hi Harvey,
I didn't weigh them but now you mention it I will,

Darren what are the piston sizes on your 6 pot Brembo,s
Ill measure pot and pad size soon.

The 6 pot brembos have three different sizes, small medium and large with the small meeting the rotation first, this is to eliminate shudder and promote even pad wear for smooth fast braking.

Just for a comparison of weight the brembos are 5.4kg and solid 355x32 rotor is 12.4kg
__________________
92 pearl SVX about to revive
92 Black 4ws (Jap spec) SVX
93 black SVX
93 Liquid Silver SVX - sti 6 speed with R180 diff, my05 sti steering wheel, sti alloy lateral links, 19x8.5 275/30 42mm offset front and 19x8.5 275/30 22mm offset on the rear, 6 pot brembo caliper with 355 rotors front, 2 pot brembos rear
95 bright red SVX
96 emerald pearl SVX about to revive
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  #35  
Old 09-19-2013, 08:46 AM
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Re: Front brake up grade to Wilwood 4 pot

Ok pot sizes are 2x25mm, 2x30mm and 2x35mm and pads are 165x55mm with a total surface area of 18,150mm2
__________________
92 pearl SVX about to revive
92 Black 4ws (Jap spec) SVX
93 black SVX
93 Liquid Silver SVX - sti 6 speed with R180 diff, my05 sti steering wheel, sti alloy lateral links, 19x8.5 275/30 42mm offset front and 19x8.5 275/30 22mm offset on the rear, 6 pot brembo caliper with 355 rotors front, 2 pot brembos rear
95 bright red SVX
96 emerald pearl SVX about to revive
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  #36  
Old 09-19-2013, 03:05 PM
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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 12:30 PM.
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  #37  
Old 09-19-2013, 04:51 PM
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Re: Front brake up grade to Wilwood 4 pot

Quote:
Originally Posted by Dessertrunner View Post
Okay I am stuffed I don't know what is happening,
piston surface area of Brembo's is 2,157sqmm,
piston area of Wilwood is 3,038 sqmm,
Existing calipers piston area is 2,512 sqmm,

It seems the experts say that you calculate piston pressure by taking the pistons on one side and calculate the area.

The fact is the Brembo will stop a car far quicker the the standard calipers so what is going on.
Tony
Stopping power can't be attributed to just pressure applied, rotor diameter and pad surface area are also play a roll. Fluid efficiency would also play a part, the relationship between fluid capacity of the pistons and the master cylinder would also make a difference. Wilwood calipers is larger then stock calipers while brembo calipers are smaller than stock calipers which would mean efficiency of the master cylinder would increase in relation to the brembo calipers along with increased rotor diameter and friction surface area. Our stock brakes would stop better if you could increase the distance from the hub and the surface area of the pad
__________________
92 pearl SVX about to revive
92 Black 4ws (Jap spec) SVX
93 black SVX
93 Liquid Silver SVX - sti 6 speed with R180 diff, my05 sti steering wheel, sti alloy lateral links, 19x8.5 275/30 42mm offset front and 19x8.5 275/30 22mm offset on the rear, 6 pot brembo caliper with 355 rotors front, 2 pot brembos rear
95 bright red SVX
96 emerald pearl SVX about to revive
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  #38  
Old 09-19-2013, 05:02 PM
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Dessertrunner Dessertrunner is offline
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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 12:30 PM.
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  #39  
Old 09-19-2013, 10:14 PM
Tireiron Tireiron is offline
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Re: Front brake up grade to Wilwood 4 pot

Whats the pad area of each of the 3 calipers, OEM, brembo and wilwood? Larger pads have more friction area. That has to be taken into account along with pressure on the pads. With equal pressure the larger pad will stop better. With equal pad surface, the greater pressure will stop better. With all 3 of them having different pressure and different pad size there are a lot of variables to figure before knowing which stops better.
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  #40  
Old 09-20-2013, 12:25 AM
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Dessertrunner Dessertrunner is offline
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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 12:30 PM.
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  #41  
Old 09-20-2013, 04:54 PM
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Re: Front brake up grade to Wilwood 4 pot

Why don't you rig up a pressure gauge between the pads of the calipers? Then you could apply the hydraulic pressure of the Svx master cylinder and lines, after all that is the only data that really matters.

I think the wilwoods fluid capacity may be too large
__________________
92 pearl SVX about to revive
92 Black 4ws (Jap spec) SVX
93 black SVX
93 Liquid Silver SVX - sti 6 speed with R180 diff, my05 sti steering wheel, sti alloy lateral links, 19x8.5 275/30 42mm offset front and 19x8.5 275/30 22mm offset on the rear, 6 pot brembo caliper with 355 rotors front, 2 pot brembos rear
95 bright red SVX
96 emerald pearl SVX about to revive
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  #42  
Old 09-20-2013, 05:56 PM
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Dessertrunner Dessertrunner is offline
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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 12:29 PM.
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  #43  
Old 09-20-2013, 06:21 PM
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Re: Front brake up grade to Wilwood 4 pot

Quote:
Originally Posted by Dessertrunner View Post
Just finished the trial I now have to eat double humble pie with Harvey, the theory I had was wrong. Time to move on.
I think Bazza's point about the master cylinder would have a lot of benfit far more then I thought at first.
Keep well.
Tony
I wonder what if any differences exist, I have a feeling the Svx master is bigger
__________________
92 pearl SVX about to revive
92 Black 4ws (Jap spec) SVX
93 black SVX
93 Liquid Silver SVX - sti 6 speed with R180 diff, my05 sti steering wheel, sti alloy lateral links, 19x8.5 275/30 42mm offset front and 19x8.5 275/30 22mm offset on the rear, 6 pot brembo caliper with 355 rotors front, 2 pot brembos rear
95 bright red SVX
96 emerald pearl SVX about to revive
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  #44  
Old 09-20-2013, 07:27 PM
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Dessertrunner Dessertrunner is offline
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Join Date: Jul 2005
Location: Griffith NSW
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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 12:29 PM.
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  #45  
Old 09-20-2013, 10:36 PM
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Re: Front brake up grade to Wilwood 4 pot

Quote:
Originally Posted by Dessertrunner View Post
Anyone know the bore of a STI,
Smaller bore then the SVX will mean more pressure on the brakes and therefor more stopping power with the same caliper.
Although too much pressure will make the wilwoods flex giving poor pedal feel
__________________
92 pearl SVX about to revive
92 Black 4ws (Jap spec) SVX
93 black SVX
93 Liquid Silver SVX - sti 6 speed with R180 diff, my05 sti steering wheel, sti alloy lateral links, 19x8.5 275/30 42mm offset front and 19x8.5 275/30 22mm offset on the rear, 6 pot brembo caliper with 355 rotors front, 2 pot brembos rear
95 bright red SVX
96 emerald pearl SVX about to revive

Last edited by 'E'; 09-20-2013 at 11:56 PM.
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