View Single Post
#23: 06-19-2004, 09:07 PM
 
 outahere
outahere's Avatar
Title: HighIntensityDenial
Location: Idaho
Car: '05 Legacy GT Wagon 5MT
Posts: 2,299
iTrader: (3)
Send a private message to outahere Find all posts by outahere Reply With Quote
Quote:
Originally Posted by SUBE555
I just updated it using the true formula and more accurate tire sizes. The formula used before was essentially something very close based on some magazine figures but not completely accurate as per how gear ratios work. The actual formula I used is this one:
((((RPM*60)/Gear Ratio)/Final Drive Ratio)*((Tire Dia*3.141592654)/63360IN per Mile))=Vehicle MPH
In the interest of accuracy, I think that instead of using "diameter", it would be better to substitute "rolling radius x 2".