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Discussion Starter #1 (Edited)
tac readout

For you in the know, what should my tac be showing with the 7.3 turbo. The truck is a 2000 f250 7.3 crew 4 x 4. Is there a formula for seeing how efficient the engine is? IE. I had a person tell me that the tac should be around 1100 to 1200 rpm at 60. Mine seems to be running around 16 or 17 rpm's at 60. Any thoughts? Would size of tire have anything to do with it. At present, it has BFG 315/75/16 on it. If I were to size them down, would the tack adjust down some, or stay the same?
 
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