Basic car math everybody should know
Want to figure out why your engine seems like such a dog after you bolted on those 35's? Wonder why you cant' pull O/D all of a sudden? Get these numbers and you will have the answer.
Find your:
1) Tire Revolutions per Mile (20,800 / tire diameter = Tire revs per mile.)
2) Transmission final drive (usually 1.0 in direct or .71 in O/D)
3) Final drive (3.7, 4.1, 4.56, etc.)
Now you can find the answer:
Transmission final drive x Tire RPM x Final drive = Engine RPM @ 60 MPH
Engine RPM / 60 x your desired speed = Engine RPm @ your speed
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