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The Subaru WRX is known for its performance and tuning potential, and one of the most effective ways to enhance its power is by upgrading to an E85 fuel system. The FuelTech E85 system can provide a significant boost in horsepower, often adding up to 30 HP. This article serves as a comprehensive installation guide for those looking to implement this upgrade.
Understanding the Benefits of E85 Fuel
E85 fuel, a blend of 85% ethanol and 15% gasoline, offers several advantages for performance vehicles like the Subaru WRX. These benefits include:
- Higher Octane Rating: E85 has a higher octane rating than regular gasoline, allowing for more aggressive tuning and timing adjustments.
- Increased Power Output: The ethanol in E85 can provide a higher power output due to its ability to burn cooler and more efficiently.
- Environmental Benefits: E85 is a renewable fuel source, which can reduce the carbon footprint of your vehicle.
Essential Tools and Parts Needed
Before starting the installation of the FuelTech E85 system, gather the necessary tools and parts to ensure a smooth process. Here’s what you will need:
- FuelTech E85 Kit
- Socket set
- Wrenches
- Fuel line disconnect tool
- Wire stripper and crimper
- Multimeter
- Safety goggles and gloves
Step-by-Step Installation Guide
Step 1: Preparing Your Vehicle
Before beginning the installation, make sure your Subaru WRX is parked on a flat surface and the engine is cool. Disconnect the battery to prevent any electrical issues during the installation process.
Step 2: Removing the Stock Fuel System
Start by removing the existing fuel system components. This includes:
- Fuel pump assembly
- Fuel lines
- Fuel injectors
Use the fuel line disconnect tool to safely remove the fuel lines. Make sure to capture any fuel that may spill during this process.
Step 3: Installing the FuelTech E85 Components
Once the stock components are removed, you can begin installing the FuelTech E85 components. Follow these sub-steps:
- Install the new fuel pump assembly designed for E85 compatibility.
- Connect the new fuel lines, ensuring they are tightly secured to prevent leaks.
- Replace the stock fuel injectors with the high-flow injectors included in the FuelTech kit.
Step 4: Wiring and Electrical Connections
Next, you’ll need to make the necessary wiring connections. This includes:
- Connecting the fuel pump harness to the vehicle’s electrical system.
- Wiring the new fuel injectors to the engine control unit (ECU).
- Ensuring all connections are secure and insulated to prevent shorts.
Step 5: Configuring the ECU
After the hardware installation is complete, you’ll need to configure the ECU to recognize the new E85 setup. This step is crucial for optimizing performance. Use the FuelTech software to adjust the fuel maps and ignition timing for E85 fuel.
Step 6: Testing the System
With everything installed and configured, it’s time to test the system. Reconnect the battery and start the engine. Monitor for:
- Fuel leaks around the new components.
- Engine performance and responsiveness.
- Check engine light or error codes.
Conclusion
Upgrading to the FuelTech E85 system can significantly enhance your Subaru WRX’s performance, adding up to 30 HP. By following this complete installation guide, you can ensure a successful upgrade that maximizes your vehicle’s potential. Always remember to perform regular maintenance and monitor your vehicle’s performance after modifications.