WOW, anyone ever take physics? Those calculations are totally bogus! Think about it, its not just the weight of the wheel but where the weight is located. If the weight was perfectly centered as a thin rod in the center of the wheel then the difference between a 16lb and a 20 lb wheel times 4 would equal 16lb, minus the effect it has from not being suspended weight, it is the same difference as if you had removed your spare tire from the trunk (assuming it was 16lb). Now if the weight was uniform along the circumfrence of the wheel and you reduced the weight by 4 pounds for each wheel then there would be a gain in acceleration as less energy would be required to rotate the wheel. In your case if it feels like its faster and the wheels are lighter, most likely it is because there is less weight concentrated along the circumfrence then what you had before. It is possible to have a heavier set of wheels net a bigger gain in acceleration then a lighter set, if the lighter set has the weight concentrated along the circumfrence and the heavier set has the weight concentrated in the center of the wheel. Just some food for thought.
ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap
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