How to VVT Swap your Miata | ECU & First Start

Introduction

This tutorial guides you through the process of performing a Variable Valve Timing (VVT) swap on your Miata, focusing on ECU wiring and initial setup. By following these steps, you will be able to get your Miata running with a Beer Money Motorsports ECU, ensuring everything is wired correctly for optimal performance.

Step 1: Understand the ECU

• Familiarize yourself with the ECU layout and functions.
• Identify the large connector for the injectors and the small connector for fuel pressure.
• Reference the following links for the necessary connectors:
  • Large Connector (Injectors): B Motorsports Injector Connector
  • Small Connector (Fuel Pressure): B Motorsports Fuel Pressure Connector

Step 2: Wire the Onboard O2 Sensor

• Locate the wiring for the onboard O2 sensor.
• Connect the O2 sensor wiring to the corresponding pins on the ECU.
• Ensure secure connections to avoid any signal issues.

Step 3: Configure the Options Port

• Review the options port on the ECU for any additional features or tunings.
• Make note of the pinouts for future wiring connections.

Step 4: Mount the ECU

• Create mounting brackets for the ECU to secure it in the chassis.
• Position the ECU in a location that ensures easy access to connectors and wiring.
• Use bolts or screws to firmly attach the ECU.

Step 5: Wire the Sequential Injection and Fuel Pressure

• Connect the wiring for sequential injection to the appropriate pins on the ECU.
• Set up the fuel pressure wiring based on your specific configuration.
• If using an AEM wideband sensor, ensure it is also connected correctly.

Step 6: IAT Sensor Modification

• Implement a wire trick for the Intake Air Temperature (IAT) sensor to improve readings.
• Follow specific instructions for modifying the wiring to enhance performance.

Step 7: Jump the Fuel Pump Wire

• Prepare to jump the fuel pump wire for priming the system.
• Use a jumper wire to connect the relevant terminals, allowing the fuel pump to activate.

Step 8: Set the Fuel Pressure

• Use a fuel pressure gauge to measure and adjust the fuel pressure.
• Ensure the fuel pressure is within the recommended range for optimal performance.

Step 9: Configure Injector Data and Dead Times

• Input the injector data into the ECU setup.
• Adjust the dead times according to the specifications of your injectors for accurate performance.

Step 10: Setup Tuner Studio

• Launch Tuner Studio to configure your ECU settings.
• Follow the user-friendly interface to input all necessary data and parameters.

Step 11: First Start

• Once everything is wired and configured, attempt the first start of your Miata.
• Monitor the engine for any irregularities during the startup process.

Conclusion

By following these steps, you should successfully complete the VVT swap on your Miata and have it running with a new ECU setup. Make sure to double-check all connections and settings before the first start. After the initial startup, consider tuning the engine further to enhance its performance. Enjoy your newly swapped Miata and happy driving!