RPM's

Discussion in 'General Discussion' started by Eddie Finch, Mar 16, 2020.

  1. Eddie Finch

    Eddie Finch New Member

    2004 Ford Ranger Edge 2wd,has 3.0 automatic, 4:10 limited slip rear gears tachs 2800 RPM @ 70 MPH, Is that normal or just mine?
     
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  3. RangerAl

    RangerAl Member

    That is pretty good..
     
  4. DeanMk

    DeanMk Member

    What size tires are you're running on it right now and what's the OD ratio of the transmission?
     
  5. OP
    Eddie Finch

    Eddie Finch New Member

    31/10.50/15
     
  6. DeanMk

    DeanMk Member

    Thanks Eddie.
    Since you failed to tell me, I had to search out the high gear ratio of your transmission.
    The reason I ask is because there's an easy math formula you can use (with the aid of a simple calculator) to answer your question.
    What you do is figure out the overall gear ratio (transmission x axle) you're using when driving at whatever speed you're curious about, then multiply that number by the speed (mph) you're driving at, divide by 336 and then multiply by the height of the tire.
    The end result will be the approximate speed of the engine, in rpm, at whatever given speed you're driving at.
    If the transmission is an automatic that DOESN'T use a lock-up torque converter, add 6.5% to the engine rpm.

    Dean
     
    Last edited: Mar 30, 2020
  7. OP
    Eddie Finch

    Eddie Finch New Member

    Thanks
     

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