felling stupid need help with gear ratio calculations
07-23-2006, 05:06 PM
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felling stupid need help with gear ratio calculations
if you had a 3.23 first gear and a 4.785 final drive ratio how do you calculate the total ratio? Then how can you figger out say 45 mph at ??:1 ratio with 205-45-16= ??rpm. Make sence because it barley does to me I suck at explaining ---- lol.
07-23-2006, 11:08 PM
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Re: felling stupid need help with gear ratio calculations
Originally Posted by highroller54
come on I know you ------s got this ----
if you're good with algebra you can swap this function out with an X for rpm if you know MPH
the formula relating road speed and engine rpm is
mph = (rpm * cir) / (gear * final * 8
where rpm = engine rpm
cir = tire cicumference, in feet
gear = gear ratio of your car
final = final drive ratio of your car
88 = combines several conversion factor
07-23-2006, 11:11 PM
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Re: felling stupid need help with gear ratio calculations
Originally Posted by rawr
if you're good with algebra you can swap this function out with an X for rpm if you know MPH
the formula relating road speed and engine rpm is
mph = (rpm * cir) / (gear * final * 8
where rpm = engine rpm
cir = tire cicumference, in feet
gear = gear ratio of your car
final = final drive ratio of your car
88 = combines several conversion factor
07-23-2006, 11:33 PM
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07-23-2006, 11:43 PM
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Re: felling stupid need help with gear ratio calculations
Originally Posted by Mista Bone
07-24-2006, 12:32 AM
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Re: felling stupid need help with gear ratio calculations
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