[Spridgets] calculating speed

David Lieb dbl at chicagolandmgclub.com
Sat Oct 18 05:13:12 MDT 2008


> Go to:
> http://bgsoflex.com/auto.html
> Then scroll down on the left to rpm range program...
> Here is a sample output.  The key item is to go measure your tire 
> diameter.

Since you already measured circumference, divide it by pi (3.1415) to get 
20.69 as a diameter.
with the 4.55 diff at 7000, that site indicates 95mph
with the 4.22 diff at 7000, that site indicates 102mph

Input Parameters Are the Following:
Differential Gear = 4.55 to 1
Transmission Gear = 1.00 to 1
Tire Diameter (Inches) = 20.69
Engine RPM = 7000
Computation Results:
Computed Vehicle MPH is 95

Input Parameters Are the Following:
Differential Gear = 4.22 to 1
Transmission Gear = 1.00 to 1
Tire Diameter (Inches) = 20.69
Engine RPM = 7000
Computation Results:
Computed Vehicle MPH is 102 


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