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
- This unit may not be used on any vehicle that is not listed on the vehicle
specific setting table.
- Please do not use this unit for any other purpose than the ones stated
3. Part Names
4. For the Installer
- Be sure to disconnect the negative terminal of the battery before starting
the installation procedures.
- Please mount the control unit in a position where the driver of the
vehicle can not adjust the unit while driving. (At least 50cm or further from
- Begin with the Wiring
- Disconnect the negative terminal of the battery.
- 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).
- 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.
RB26DETT engine have 2 air flow signals wires so be sure to cut both air
flow signal wires.
- 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.
- Connect the white wire of the signal harness to the Female Fitting used
in 3. and connect the yellow wire to the Male Fitting.
- Reconnect the negative terminal of the battery to complete the
Connection of the Fittings
*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.
*Please move the switch towards the black
3. Once the engine has been started, it is now
possible to adjust the air flow signal by adjusting the RPM Specific
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.
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
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
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
Specific ECU Wiring Diagram
Arrangement of ECU is for only Right Handle Car.
Following Diagrams view the Coupler from the Same Angle as the Diagram.
Please be Careful Not to make Improper Connections or Short Out the
Connection Diagram for S-AFC and Other Equipment