RPM'S TO MPH

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RPM'S TO MPH

Postby ANTHONY » Wed May 31, 2006 8:31 pm

HOW DO I CONVERT RPM'S OF A DRIVESHAFT TO MPH THAT A SPEEDOMETER SHOULD READ
ANTHONY
 

Re: RPM'S TO MPH

Postby Guest » Wed May 31, 2006 9:11 pm

ANTHONY wrote:HOW DO I CONVERT RPM'S OF A DRIVESHAFT TO MPH THAT A SPEEDOMETER SHOULD READ


The tire rpm is the driveshaft rpm divided by rear axle ratio.
Then you need to know either the circumference of the tire, or the tire revolutions per mile.

Are you starting with driveshaft rpm or engine rpm? If engine, you also need to know the transmission ratio in top gear.
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