Super AFC

1. Preface

Thank you for purchasing the APEXi Super AFC (Super Air Flow Converter.) This unit is a highly efficient controller allowing the vehicle air flow sensor measures the amount of intake air and allows the vehicle engine control unit (computer) to specify the fuel setting for the vehicle. This unit allows this signal to be adjusted so that it becomes possible to change the fuel setting amounts for the vehicle.

* CAUTION * 2. Parts List



3. Part Names


4. For the Installer

* WARNING *
  1. Begin with the Wiring
    1. Disconnect the negative terminal of the battery.
    2. Use the ECU location line of the Vehicle Specific Setting Table and the Vehicle Specific ECU Wiring Diagram on page 13 to locate the vehicle engine control unit (ECU).
    3. While referring to the Vehicle Specific ECU Wiring Diagram, cut the air flow signal wire of the harness going into the engine control unit and put a fitting on the wire. Use a Male Fitting for the engine control unit side and use a Female Fitting for the vehicle harness side.
      *Vehicles with RB26DETT engine have 2 air flow signals wires so be sure to cut both air flow signal wires.
    4. While referring to the Vehicle Specific ECU Wiring Diagram, use the splitting cap to connect the power wire, ground wire, and RPM signal wire of the engine control unit harness to the red, black, and green wires of the included harness. Be sure to wrap all connections with electrical tape.
    5. Connect the white wire of the signal harness to the Female Fitting used in 3. and connect the yellow wire to the Male Fitting.
    6. Reconnect the negative terminal of the battery to complete the installation procedures.

    Connection of the Fittings


    Wiring Diagram

    *Please use the diagram below for vehicles using the RB26DETT engine.



    2. Please refer to the Vehicle Specific Setting Table to set the Vehicle Selection Switch and Air Flow Type Selection Switch on the back side of the unit.

    Setting the Air Flow Type Selection Switch.


    ex. Infiniti Q45



    *Please move the switch towards the black colored section.


    3. Once the engine has been started, it is now possible to adjust the air flow signal by adjusting the RPM Specific Adjustment Volume.

    5. Explanation of Function

    This unit takes the input air flow sensor signal and modifies the signal to show volumes of air which can be controlled by adjusting the RPM Specific Adjustment Volume on the front of the unit. The unit then translates the newly adjusted air volume amount to the corresponding air flow sensor signal and sends the information to the engine control unit. For example, the adjustment colume is in the +15% position. If a 100% air flow signal input is being received at this point, the output from this unit will be 115% to the engine control unit allowing the injectors to spray fuel amounts for 115% air flow signal.

    Because the engine control unit calculates optimum fuel amounts according to air flow signal input, the air flow volume and fuel amounts will remain almost perfectly proportional. The next diagram depicts a +15% fuel increase.



    With the S-AFC, the air flow signal may be adjusted according to specific RPM ranges by using the 5 adjusting volumes on the front of the unit. The RPM ranges include 800, 2400, 4000, 5600, and 7200 with a maximum air flow adjustment of + or - 30% in 2% increments. Adjusting each of the volume knobs on the front of the unit will allow setting of the RPM ranges.

    EX. When the volumes are set in the positions below.



    6. Vehicle Specific Setting Table

    Please refer to the Vehicle Specific Setting Table to set the Vehicle Selection Switch and Air Flow Type Selection Switch on the back side of the unit.

    Setting the Air Flow Type Selection Switch


    ex. Infiniti Q45



    Type Select
    6.1 Nissan


    6.2 Toyota



    6.3 Mitsubishi


    6.4 Honda


    6.5 Mazda


    6.6 Subaru



    6.7 Isuzu


    6.8 Suzuki


    6.9 Daihatsu


    * Abbreviations
    TRC  Traction Control
    A/T  Automatic Transmission
    M/T  Manual Transmission
    T/C  Turbo Charger
    S/C  Super Charger
    N/A  Naturally Aspirated
    2WD  2 Wheel Drive
    4WD  4 Wheel Drive

    7. Vehicle Specific ECU Wiring Diagram







    This Arrangement of ECU is for only Right Handle Car.

    *The Following Diagrams view the Coupler from the Same Angle as the Diagram.
     Please be Careful Not to make Improper Connections or Short Out the Unit.

    8. Connection Diagram for S-AFC and Other Equipment
    8.1 Nissan



    8.2 Toyota



    8.3 Mitsubishi


    8.4 Honda


    8.5 Mazda


    8.6 Subaru


    8.7 Isuzu


    8.8 Suzuki


    8.9 Daihatsu