The FAST EZ-EFI 2.0 is a self-tuning fuel injection system designed to simplify the transition from carbureted or older fuel-injected engines to modern electronic fuel injection (EFI). This system is ideal for do-it-yourself enthusiasts who want to upgrade their classic or modified vehicles without the complexity of advanced tuning software or the need for professional assistance. The EZ-EFI 2.0 is particularly suited for engines in the 400–500 horsepower range, making it a popular choice for restoration projects and performance builds alike.
This article will walk through the components included in the EZ-EFI 2.0 kit, the installation process, and the basic setup procedures. It will also cover key considerations such as ECU placement, sensor installation, and the use of the Setup Wizard to reset the system to factory settings. The information provided is based on the manufacturer’s technical documentation and installation instructions, ensuring that users have an accurate and reliable guide for their project.
Overview of the EZ-EFI 2.0 System
The FAST EZ-EFI 2.0 is a retrofit fuel injection system that replaces traditional carburetors or older EFI setups with a modern, self-tuning electronic control unit (ECU). It is designed to be user-friendly, eliminating the need for a laptop or advanced tuning knowledge. The system performs its own tuning using a built-in wide-band oxygen (O2) sensor, which allows it to adjust fuel delivery based on real-time engine conditions.
The system is available in several configurations, each tailored for different engine types and applications. One common configuration is the multi-port retrofit kit (Part Number 302000), which is suitable for Ford EEC-IV 5.0L engines and other applications such as GM's TPI setups. When used with FAST’s XIM ignition module, the system can also be adapted for Ford modular engines.
The EZ-EFI 2.0 kit includes all the necessary electrical components for installation, including a main wiring harness, a serial cable for the handheld controller, and a plug-in power lead for a 12V source. The ECU, which serves as the system's brain, is water-resistant and temperature-resistant, allowing it to be mounted under the hood or inside the vehicle.
Components Included in the EZ-EFI 2.0 Kit
The EZ-EFI 2.0 kit is supplied with a comprehensive set of parts to facilitate a complete installation. The base kit (Part Number 30400-KIT) includes the following items:
- 1 EZ-EFI 2.0 Assembled Throttle Body (Part 304151MCAS)
- 1 EZ-EFI 2.0 ECU Module (Part 30326)
- 1 EZ-EFI 2.0 Touchscreen Handheld Unit (Part 30308)
- 1 Main Wiring Harness (Part 30310)
- 1 Handheld Cable (Part 30310)
- 1 Tach Adapter Assembly (Part 170637)
- 1 Coolant Temperature Sensor (Part 30087)
- 1 Brass Bushing (Part 170408)
- 1 Bosch LSU4 Wideband O2 Sensor (Part 30168)
- 1 O2 Fitting (Part 82042)
- 12 O2 Sensor Plugs (Part NS6548)
- 4 Square Bore Carb Gaskets (Part 304150TBJ)
- 4 Tie Straps (Part 304150TBJNUT)
- 4 Self-Tap Screws (Part 30425FSB)
- 1 Throttle Ball Join (Part 30425SPA)
- 2 Nylon Lock Nuts (Part 30425MS)
- 10 Fuel Pressure Sensors (Part 170665)
- 2 Fuel Pressure Sensor Adapters (Part 170666)
- 1 Fuel Pressure Sensor (Part 170667)
Each component is labeled clearly for easy identification and installation. The kit is designed to be all-inclusive, minimizing the need for additional parts or modifications during the installation process.
Installation Process
The installation of the FAST EZ-EFI 2.0 system can be completed in a home garage with standard tools and a few hours of time. The process involves several key steps, including ECU and throttle body mounting, sensor installation, and wiring.
Mounting the ECU
The ECU is water-resistant and can be mounted in either the engine compartment or inside the vehicle. For optimal performance and ease of access, FAST recommends mounting the ECU at least 2 feet away from electrically noisy components such as ignition coils or control boxes. In the example provided, the ECU was installed in the Firebird’s glovebox, which also provides quick access for initial setup and monitoring during driving.
When mounting the ECU, it is important to avoid locations with extreme heat or poor airflow. The USB port on the ECU is only used for firmware updates and is not required for normal operation. Thread sealant or tape should be used when securing the ECU to ensure a secure and weather-resistant connection.
Installing the Throttle Body
The throttle body is a critical component of the system and must be installed correctly to ensure proper function. The installation process involves threading the studs into the intake manifold’s carburetor flange, installing the gasket, and securing the throttle body with nuts. The nuts should be tightened to 10 ft-lb using a 12-inch socket.
The throttle body must also be aligned correctly with the intake manifold. A properly installed throttle body ensures that air and fuel are delivered evenly to each cylinder, which is essential for smooth engine operation and efficient fuel use.
Routing the Wiring Harness
The main wiring harness must be routed through the firewall to connect the ECU to the rest of the system. A 1.375-inch hole should be drilled through the firewall to accommodate the harness, and a rubber grommet should be used to seal the hole and prevent air or water leakage.
Each wire in the harness is labeled for easy identification. The harness connects to the ECU, the throttle body, and various sensors such as the coolant temperature sensor and the wideband O2 sensor. It is important to ensure that all connections are secure and properly seated to prevent electrical issues.
Coolant Temperature Sensor Installation
The coolant temperature sensor is a critical component for accurate ECU function. It should be installed in an existing mounting hole on the intake manifold or in the engine block. The sensor has 3/8" NPT threads, and an adapter may be required for manifolds with 1/2" NPT threads.
Before installation, it is important to ensure that the sensor is not exposed to excessive heat from headers or exhaust components, as this can affect temperature readings and lead to incorrect fuel delivery. Thread sealant or tape should be used to secure the sensor in place and prevent leaks.
Initial Setup and Configuration
After the hardware components are installed, the system must be configured using the Setup Wizard. The Setup Wizard is accessible through the handheld controller and guides the user through the necessary settings for the ECU. It is important to note that running the Setup Wizard will overwrite any previous configurations and user adjustments, restoring the ECU to its factory settings.
Using the Setup Wizard
The Setup Wizard is designed to be intuitive and user-friendly. It can be accessed by pressing the appropriate icon on the handheld controller. The wizard will walk the user through a series of steps, including:
- Engine type and displacement
- Ignition system configuration
- Sensor calibration
- Fuel system settings
Each screen in the wizard allows the user to make adjustments as needed. The red and green arrow buttons on the screen are used to navigate through the wizard, while the "Next" button saves the current settings and moves to the next screen. The "Back" button discards any changes made on the current screen and returns to the previous step.
It is important to follow the wizard’s instructions carefully and to ensure that all settings are correct for the specific engine and vehicle. Incorrect settings can lead to poor performance or engine damage.
Live Data and Diagnostics
Once the Setup Wizard has been completed, the system can be monitored using the Live Data and Diagnostics features. The Live Data screen provides real-time information about the engine’s performance, including air-fuel ratio, coolant temperature, and throttle position. This data can be used to monitor the system’s operation and identify any potential issues.
The Diagnostics section allows the user to access error codes and other system information. If the ECU detects a problem, it will display a code that can be used to troubleshoot the issue. In some cases, the system may require a reset or recalibration to resolve the problem.
Advanced Settings and Adjustments
The EZ-EFI 2.0 system also includes an Advanced menu that allows users to make additional adjustments beyond those covered in the Setup Wizard. This menu provides access to more detailed settings, including ignition timing, fuel trim, and idle control.
Users should exercise caution when making adjustments in the Advanced menu, as incorrect settings can affect engine performance or cause damage. It is recommended that only experienced users or those with a strong understanding of engine tuning use this feature.
The Advanced menu also includes options for customizing the system’s behavior, such as adjusting the idle speed or modifying the fuel delivery curve. These adjustments can be useful for fine-tuning the system to match the specific needs of the engine and vehicle.
Troubleshooting Common Issues
Even with a properly installed and configured system, users may encounter issues that require troubleshooting. Some common problems include:
Starting issues: If the engine does not start, check the fuel pump, spark plug, and ignition system. Ensure that the ECU is receiving power and that the throttle body is properly connected.
Rough idle: A rough idle may be caused by incorrect air-fuel ratio settings or a malfunctioning sensor. Use the Live Data feature to monitor the system and identify the root cause.
Error codes: If the ECU displays an error code, refer to the manufacturer’s documentation to determine the cause and appropriate solution. Some common codes indicate issues with the O2 sensor, fuel pump, or coolant temperature sensor.
Poor performance: If the engine runs poorly or lacks power, check the Setup Wizard settings to ensure that they are correct for the engine and vehicle. Adjustments may be needed to improve performance.
Conclusion
The FAST EZ-EFI 2.0 system is a powerful and user-friendly solution for upgrading classic or modified vehicles to modern fuel injection. It eliminates the need for complex tuning software and provides a self-tuning system that adjusts fuel delivery based on real-time engine conditions. The system is designed to be easy to install and configure, making it accessible to a wide range of users, from hobbyists to professional restorers.
With its comprehensive kit and intuitive Setup Wizard, the EZ-EFI 2.0 offers a reliable and efficient way to improve engine performance and driveability. Whether you're working on a restoration project or building a high-performance machine, the EZ-EFI 2.0 provides the tools and flexibility needed to achieve your goals.