Figuring out MPH formula/math
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Joined: Mar 2001
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From: Bronx, NY
Figuring out MPH formula/math
Hi just hopeing someone might be able to help me out here. I know that the standard way to determine MPH is RPM x Tire Diameter divided by Gear Ratio x 336. However, I realize this formula is for a 1.00 ratio tranmission gear. How would one convert this to find out MPH in say a 4th gear .70? Hope someone knows. Thanks.
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87 GTA 350 L98
K&N filters, beefed up TH-700r4, Accel Manifold, Ported Plenum and Runners, Fuel Press. Regulator 49.5psi, air foil, modified MAF, SLP cold air box, Hypertech Thermomaster chip w/160 thermostat, MSD 6AL and Blaster 3, B&M shift kit & megashifter, Moser Ford 9in Rear with Richmond 3.50 and locker, Edlebrock TES headers and Cat Back,Hotchkis setup in rear, Poly suspension and Koni in the front
Fastest ET's
Stock-0-60 6.8, 1/4 15.0 @ 98
Best-0-60 4.7, 1/4 12.8 @ 112
Norm-0-60 5.2, 1/4 13.2 @ 108
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87 GTA 350 L98
K&N filters, beefed up TH-700r4, Accel Manifold, Ported Plenum and Runners, Fuel Press. Regulator 49.5psi, air foil, modified MAF, SLP cold air box, Hypertech Thermomaster chip w/160 thermostat, MSD 6AL and Blaster 3, B&M shift kit & megashifter, Moser Ford 9in Rear with Richmond 3.50 and locker, Edlebrock TES headers and Cat Back,Hotchkis setup in rear, Poly suspension and Koni in the front
Fastest ET's
Stock-0-60 6.8, 1/4 15.0 @ 98
Best-0-60 4.7, 1/4 12.8 @ 112
Norm-0-60 5.2, 1/4 13.2 @ 108
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