Ring and Pinion Factory Option on C2's

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08-24-2007, 11:10 AM

#16

joey bagadonuts

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Quote:

Originally Posted by TIM COSTA

Its all very interesting but there still seems to be some confussion about how much someone could possibly gain by such a small change in ratios.That is with out changing anything else

Good question, Tim.

As you may have guessed, the 8:32 has a larger impact.

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08-24-2007, 12:00 PM

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Manny Alban

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very cool Joey. Where did you get that graph? I would love to input different tire diameters.

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08-24-2007, 12:21 PM

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joey bagadonuts

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Manny, I sent a copy to your e-mail address from the PCA.org website. It's an Excel file I conjured up.

IIRC, I got the formula from the Bruce Anderson book, in the section outlining gear selection. For those interested in generating your own worksheet:

MPH = (RPM x Tire Diameter x 0.002975) / (R&P Ratio x Driven Gear Ratio)

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