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Discussion in 'EFI Maps and Tuners' started by mcgregor, May 15, 2010.

  1. mcgregor

    mcgregor New Member

    May 15, 2010
    Likes Received:
    I have a '01 ultraglide w/stage 1 and aftermarket muffs w/ a revtech dfo. At present it has kerkers w/o baffles and sounds bad. Gonna put on rinehart slipons. Any idea as to how you set the dfo? I noticed it has 4 screw adjustments but don't know where to go from there. McGregor
  2. cowboy

    cowboy Moderator Staff Member

    Apr 19, 2006
    Likes Received:
    Alvin TX
    if you did'nt get the paper work with it , to tell you how to did any adjustments look up there web site & or contact them
  3. hotroadking

    hotroadking Super Moderator Staff Member

    Jun 16, 2004
    Likes Received:
    Mouseville USA
    DFO or digital fuel optimizer is simply an electronic tuner

    it has 4 pots or screws for setting fuel at different rpm levels.

    the 4th is a transition pot for when things happen.

    the Revtech is sold by Custom Chrome contact them for
    the instructions.

    Custom Chrome Home
  4. ringo912

    ringo912 Active Member

    Jan 2, 2007
    Likes Received:
    You may have found your info by now, if not, here's some regarding DFO's. First, a DFO is not a true tuning module. They basically turn your EFI bike, into a bike with a electronic carburetor. They are linear just like a carburetor, which means, each circuit bleeds into the next. They usually have 4 pots with a green, red, and yellow light.

    First pot, (green light), is your air fuel mixture scew.

    Second pot, (yellow light), is your acceleration fuel adjustment screw, (accelerator pump).

    Third pot, (red light), is your main jet fuel adjustment.

    Fourth pot, no light is the transition screw. This one sets the rpm at which the main jet or third pot, (red light), turns on.

    Notice the terminology used, (air fuel mixture screw), (accelerator pump), ( main fuel jet), sound just like a carburetor. This is the exact terminology used in the instuction manual that comes with a DFO. Remember, no matter what tuning device you install, without access to a dyno, you cannot properly tune the engine for optimum performance.

    Hope this info helps.

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