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Old 06-03-2004, 12:44 AM
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gear ratio calculator?

I put in these figures in the calculator,

MPH = 140
tire diameter = 26.5 inches
rear gear ratio 3.08
trans gear ratio = 1:1 for 3rd gear of TH350

The RPMS it spit out were about 5,500 RPMS which is about the limit of my engine. Will my car really go this fast? Is this accurate? I dont have a speedometer, so I'm not sure but this doesnt seem right.


Last edited by M&M CUSTOM; 06-03-2004 at 06:05 AM.
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Old 06-03-2004, 05:59 AM

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No. The calculator formula is pure math based on physics. There is no input for how many RPMs the the motor will turn under given loads. You plugged in the numbers to find out the revs at 140 and it tells you. It takes a pretty good motor to rev 5500 under load and the load that increases with speed is the wind or in more technical terms, friction caused by drag. And there are basically two types of drag on your automobile, parasite and induced. Parasite drag is determined by the shape, ie flat plate, protrusions etc (streamline is less, box is more) Induced drag is more from the turbulence behind the vehicle and the air being forced underneath (this is one of the reasons two or three NASCAR racers in a close line can pull away from cars racing side by side). After all of this gobble gook, as your speed increases, the load grows and the engine rev limit goes down as though you are climbing a hill that gets steeper and steeper.

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