OBD1 Honda 1980 VTEC Conversion Kit Installation Instructions

We sell the components required for this conversion as a complete kit here: OBD1 USDM VTEC conversion kit

This guide covers the installation of components needed to convert a non‑VTEC 1980 ECU to VTEC. After performing the hardware conversion, you must install an EEPROM chip or emulator with a calibration that enables VTEC functionality.

Required Components

• 1uF tantalum capacitor (C60)
• Jumper wire (use repurposed lead from another component)
• NPN transistor (Q26)
• 1N4002 clamping diode (D11)
• 5151 High‑side switch (IC14)
• 10k ohm resistor
• 12k ohm resistor
• 51k ohm resistor

All components are included in our VTEC conversion kit.

Installation Steps

1. Install Capacitor at C60

• Solder the yellow tantalum capacitor to the C60 position.
• Ensure correct orientation as indicated on the board.

2. Install Jumper Wire at J10

• Use a trimmed lead from another component as a jumper.
• Solder it in place at J10.

3. Install NPN Transistor at Q26

• Place the NPN transistor at location Q26.
• Follow the shape and footprint markings on the board to orient correctly.

4. Install Diode at D11

• Solder the diode to D11.
• Align the stripe on the diode with the stripe indicated on the PCB silkscreen.

5. Install High‑Side Switch at IC14

• Solder the high‑side switch at IC14.
• Ensure correct orientation per the footprint.
  

6. Install resistors

• Install 10k resistor at R142
• Install 51k resistor at R143
• Install 12k resistor at R144

Final Notes

• Once these components are installed, the ECU hardware will support VTEC.
• A compatible calibration (EEPROM chip or emulator) must be installed to enable VTEC activation.
• Refer to the highlighted 1980 board image below for component locations.