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Thread: Raising shift limit on F150 Ford

  1. #21
    Senior Tuner Mep_q8's Avatar
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    Mar 2006
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    Great! Should be finally taking the truck down to a dyno for a proper session.. We did a trial run and came to 265whp/290wtq.. 12.5 was only being commanded at 4,700rpm and above, so we need this session to get the AFr dialled in right!

    Temps are starting to get 40*C during the day now :S

    Bader Norris
    MEP Tuned
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  2. #22
    Senior Tuner
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    Jun 2005
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    Southern FL
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    Guys, as Tony is alluding to, this is really easy to do. Just set the Shift Point RPM scalars to the RPM you want it to shift at, and then adjust the Shift Point MPH functions to the proper value for it to match the rpm, but at the highest two TP values (for WOT). Russ K said to ratio the difference, and that is pretty much how you do it. i.e. (new rpm / stock rpm) * stock mph.

    As for a shift point that high on the 5.4 3V, it's capable of that, sure, but unless you've done some inlet improvements (such as a CAI), as well as exhaust, the powercurve will fall off HEAVILY after 4.5k (which is about where peak power is obtained on a stock inlet/exhaust 5.4 3V). I've tuned a ton of these things.

    Bone stock, with just a tune, they usually make 250 rwhp (+/- 5 rwhp) and 330 rwhp (+/- 5 rwtq).
    Last edited by RWTD; 04-03-2008 at 11:52 PM.
    Formerly known as RWTD

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