Need some help

[moose35]

Ive looked for the last hour with no luck...... Im trying to find my rev per mile so i can prgram it into my SCT tunner...... Im running 40/15.5/20 toyo mt's


Any help would be greatly appreaciated... Thanks in advance.

 

[DaveBen]

Take your tire circumference in feet and divide into 5280 to get the number of tire rotations per mile. Now, tire rotations times X gear ratio (like 3.73) = engine turns per mile. Multiply this number times the miles per hour will give you rpms at your miles per hour. Clear??

Dave

 

[rustinh1]

circumference of tire = pi*Diameter = 125.67"/12" = 10.47'/rotation.

5280'/mile divided by 10.47' per rotation = 504.3 revolutions per mile.