Well after several weeks of research and brake system design calculations I finally received my custom brake setup from Keith over at Custom Works Products. Great work Keith they look beautiful.
So here is the story. I want to run the Year One 17x9 inch Pontiac Rally II wheels on my 70 Trans Am. They are way less expensive than a custom made 18 inch Rally II ($200 vs. $600) and they just look great. I also wanted to run a Wilwood big brake setup to compliment the rear D154 Floating calipers and 12.19 inch rotors. I looked at the Wilwood Forged Narrow Superlite 6 piston kits and after taking several measurements of the inside of the year one wheel and looking at the diagrams on the wildwood site, it was determined that the FNSL 6 Piston setup would not fit in the 17x9 Year one wheel. I am only talking about a fraction of an inch causing clearance issues but the fact is that they will just not fit inside the wheel. Also, the Wilwood kit comes with a 12.88 inch diameter and .81 inch thick rotor without curved vanes. This is just not enough rotor for the demands of hard driving on road courses like Road Atlanta or Carolina Motorsports Park.
So after talking with several expert brake designers throughout the country, I finally decided on the Wilwood FSL4 Caliper, a Custom 13 inch diameter and 1.25 inch thick slotted, directional curved vain rotor, and modified 1979-81 Firebird Spindle with the larger outer bearing. The FSL4 is a lower profile caliper than the FNSL6 and successfully corrects the clearance issues on a Year One 17x9 Rally II. The clamping force on the 4 piston caliper is also actually more than the 6 piston wildwood calipers. I also selected the aluminum hats in order to dissipate the heat better. EBC Yellow Stuff pads were selected.
Here are the final results.
http://www.youtube.com/watch?v=COMsP...ature=youtu.be
