2005 Mustang V6 U7140

[TJFT]

I have a U7140 Preditor and I did a parameter change on the Tire Revs for proper Speedometer range for a set of 18" Tires. I did as follows: took the 20168 and devided it by the tire diameter of 18" and came up with 1120 and entered that into the tune. I have since driven the car and I think its not correct as I was flying down the road and that was at 40 MPH and prior to ever tuning the car I recognized what 40 mph felt like..this seems more like 70mph...any help?

[Mike_Levy]

What size tires are you running and in what format do you need to diameter?

[mikel]

tire diameter of 18"
No way thats right, maybe 18" rim, not tire.

Also, it is 20618.

[TJFT]

Mike the instruction that came with my manual shows in two different places 20168

[TJFT]

Man did I goof it up...diameter is 27"..lack of sleep will do that, but Mike I did read tonight to double check and the U7140 did state the calculation to be 20168..is this a misprint as I have not DL the new updates yet. Thanks Tom

[Vas@Diablosport]

You are correct, the formula is 20168 divided by 27 which would be 747 revs per mile.

[VinSpain]

hi, i've 235-55-20" in my 05 V6 stang & i try to change that in my predator but no way how 2 do it, it appears in parameter 3,29 i divided 215/65 = 3,0 (215-65-16 stock wheel i guess ), what i have to do? how can i put the correct INCH & REVS per mile
P.S : sorry 4 my bad eng