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SCT X4 Questions.

Discussion in 'Modified 2002 - 2005 Explorers' started by Swamprabbit, February 12, 2016.

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  1. Swamprabbit

    Swamprabbit New Member

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    Just got my SCT X4 programmer.

    2003 EX XL 4.0 All stock except tires and lift.

    I turned off the rear O2 sensors.

    (1st) What do I set the speedo cal at? It asks for tire rotations.
    Stock gear 3:73
    Stock Tire 235/70 R16
    Current Tire 285/75 R16

    (2) any recommended changes I need to make?

    Thanks guys.
     
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  3. swshawaii

    swshawaii Elite Explorer

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  4. drdoom

    drdoom Well-Known Member

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    Have you replaced the stock tune yet?
     
  5. Swamprabbit

    Swamprabbit New Member

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    That's what I was thinking. But the last programer I had you entered the tire size. LOL

    Thank you.
     
  6. Swamprabbit

    Swamprabbit New Member

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    Yes.All I did was step up one octane rating on it. Turned off the rear O2 sensors. Reset the speedo. That's it.
     
  7. Swamprabbit

    Swamprabbit New Member

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    Has anyone mess with the transmission setting. For example preasure settings?
     
  8. lynchy wa

    lynchy wa Down Under Beer Explorer Elite Explorer

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    No....Cos that sounds bloody scary :D
     
  9. Swamprabbit

    Swamprabbit New Member

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    It does to me also. But. There is always a BUT.
    This is my 1st tuner that allowed for several different options. Unlike superchip where you are limiter to what they installed. (pre programmed)
     
  10. SPSully

    SPSully Active Member

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    increasing the trans pressure (to a certain extent) is going to make it shift harder.... but like a shift kit, the harder shift moves it in gear faster causing for less wear and tear during shift.
     

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