[freezy74]

Is there a math formula for this? I'd like to program it into my Holley for the data log. I have it doing converter slip already, figured it was possible to do MPH also.

Thanks.

 

[64duece]

Shaft Speed (RPM)/Gear Ratio*Tire Diameter (in feet)*60/5280

Calculate Circumference= (Pi*Diameter)/12 = Diameter in Feet

 

[S2H]

Shaft Speed (RPM)/Gear Ratio*Tire Diameter (in feet)*60/5280

Calculate Circumference= (Pi*Diameter)/12 = Diameter in Feet

or the more simple math

MPH = (Driveshaft rpm * tire diameter in Inches ) / ( Gear Ratio * 336)

 

[freezy74]

Shaft Speed (RPM)/Gear Ratio*Tire Diameter (in feet)*60/5280

Calculate Circumference= (Pi*Diameter)/12 = Diameter in Feet

Ok Thanks. I'll try to figure this out.

 

[freezy74]

or the more simple math

MPH = (Driveshaft rpm * tire diameter in Inches ) / ( Gear Ratio * 336)

Got that to work quick, thanks!!

 

[freezy74]

Funny, my 1-2 shift is 101.5 mph, and it gets there in 2.6 seconds lol...I love data....