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08-15-2008, 09:14 AM
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CC Member
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Join Date: Jul 2004
Location: Hopkinton,
MA
Cobra Make, Engine: early Contemporary Cobra (1005), 67 Shelby GT350 with Inline carb on a Boss 302
Posts: 121
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Not Ranked
Front to Rear Brake Bias
I just got this nifty little spreadsheet that calculates brake bias from Mickmate and now I'm dangerous  . Contemporary used Jag XKE pedals and brakes with a VW Super Beetle master cylinder (.75" dia.) for their stock offering. The upgrade that they offered used Wilwood Superlite 4 piston calipers (1.38" dia.) with XJ vented rotors, machined hubs, and series II uprights. The stock Series I Jag stuff works out to 59% front brake bias and with the recommended upgrade 57%. For reference, the ideal is 66% and my Miata with about the same front to rear weight distribution as the Cobra is 70%. Using Wilwoods with the 1.75" piston diameter would change the bias to 67%, so by the numbers I think Contemporary got it wrong! I would like to hear from Contemporary folks on what brake bias works for you? |
08-15-2008, 05:07 PM
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CC Member
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Join Date: Jul 2004
Location: Hopkinton,
MA
Cobra Make, Engine: early Contemporary Cobra (1005), 67 Shelby GT350 with Inline carb on a Boss 302
Posts: 121
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Not Ranked
Correction, 62% front bias stock, 60% with factory upgrade. I forgot to account for the 10" rear vs. 11" front rotor diameter.
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08-15-2008, 05:12 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
I love seeing theory and practice working together!
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08-16-2008, 03:39 PM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,501
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Not Ranked
Mick, It's just that some of us need more practice than others!
__________________
Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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08-16-2008, 08:21 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
Fun though ain't it! 7 P's..........proper preparation and practice prevents p!ss poor performance
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08-18-2008, 10:14 AM
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CC Member
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Join Date: Jul 2004
Location: Hopkinton,
MA
Cobra Make, Engine: early Contemporary Cobra (1005), 67 Shelby GT350 with Inline carb on a Boss 302
Posts: 121
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Not Ranked
Contemporary Brake upgrade
Okay, no opinions on that one so I will share what I have decided. I am selling my Wilwood Superlite calipers with 1.38" pistons, buying a set with 1.75" pistons, and putting the pistons from the Jag Series I front brakes in the rear (bottom option). I may also put a porportioning valve in the rear line to get to the magic 66% number! Let me know if anyone wants more details on this upgrade,
--------------------------------------Front Brake Bias-- Front Tire Force
--------- Jag Series I----------------------62%--------------2910
--------- WW 1.38", Jag 1.75"--------------60%--------------2660
--------- WW 1.75", Jag 1.75"--------------70%--------------4114
--------- WW 1.75", Jag 2.12"--------------62%--------------4114
Wilwood 1.75" Brake force increase----------------------------141%
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08-18-2008, 12:27 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
Sounds like a man with a plan! If it was mine I'd try it at 62% with a panic stop. You can always add the valve if'n ya think you need to.
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