Affordable E85 Conversion for Wrx: Achieving 350 Hp with 1000cc Injectors and Cobb Accessport Tune

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The Subaru WRX has long been a favorite among car enthusiasts, known for its performance and tuning potential. One of the most effective ways to boost the power of your WRX is through an E85 conversion. This article will explore how to achieve 350 horsepower using 1000cc injectors and a COBB Accessport tune, all while keeping the conversion affordable.

Understanding E85 Fuel

E85 is a high-performance fuel that consists of 85% ethanol and 15% gasoline. It has a higher octane rating than traditional gasoline, allowing for more aggressive tuning and increased horsepower. However, it’s essential to understand the benefits and considerations before making the switch.

  • Higher Octane Rating: E85 typically has an octane rating of around 105, which helps prevent knock and allows for more aggressive timing.
  • Increased Power: The higher ethanol content provides more oxygen during combustion, leading to a more potent fuel mixture.
  • Cost-Effective: E85 is often cheaper than premium gasoline, making it a cost-effective option for performance enthusiasts.

Required Components for E85 Conversion

To successfully convert your WRX to run on E85 and achieve 350 horsepower, you will need several key components. Below is a list of the necessary parts:

  • 1000cc Fuel Injectors: These larger injectors are essential for delivering the increased fuel flow required for E85.
  • High-Pressure Fuel Pump: An upgraded fuel pump is necessary to maintain adequate fuel pressure for the higher demand of E85.
  • COBB Accessport: This tuning device allows you to reprogram your engine’s ECU for optimal performance with E85.
  • Fuel Lines and Fittings: Depending on your setup, you may need to upgrade fuel lines and fittings to handle the ethanol.

Installing 1000cc Injectors

Installing 1000cc injectors is a crucial step in the E85 conversion process. Here’s a step-by-step guide to help you through the installation:

  • Step 1: Disconnect the battery to prevent any electrical issues.
  • Step 2: Remove the engine cover and intake manifold to access the fuel rail.
  • Step 3: Carefully remove the existing fuel injectors from the fuel rail.
  • Step 4: Install the new 1000cc injectors, ensuring they are seated correctly.
  • Step 5: Reassemble the intake manifold and engine cover.

Upgrading the Fuel Pump

To support the increased fuel flow required for E85, upgrading the fuel pump is essential. Here’s how to do it:

  • Step 1: Remove the rear seat to access the fuel pump access panel.
  • Step 2: Disconnect the fuel lines and electrical connectors from the fuel pump.
  • Step 3: Remove the old fuel pump and install the new high-pressure fuel pump.
  • Step 4: Reconnect the fuel lines and electrical connectors.
  • Step 5: Test for leaks before reassembling the access panel and rear seat.

Tuning with COBB Accessport

The COBB Accessport is a powerful tool for tuning your WRX to run efficiently on E85. Follow these steps to get started:

  • Step 1: Connect the Accessport to your vehicle’s OBD-II port.
  • Step 2: Choose the appropriate E85 map for your setup.
  • Step 3: Upload the map to your ECU, following the on-screen instructions.
  • Step 4: Monitor your vehicle’s performance and make adjustments as necessary.

Testing and Verification

After completing the installation and tuning, it’s essential to test your WRX to ensure everything is functioning correctly. Here are some steps to verify your setup:

  • Step 1: Start the engine and check for any leaks in the fuel system.
  • Step 2: Monitor the fuel trims and air-fuel ratio using the Accessport.
  • Step 3: Take the car for a test drive, paying attention to throttle response and power delivery.
  • Step 4: Perform a dyno test to confirm you are achieving the desired 350 horsepower.

Conclusion

Converting your WRX to run on E85 can unlock significant performance gains, allowing you to achieve 350 horsepower with the right components. By installing 1000cc injectors, upgrading the fuel pump, and utilizing a COBB Accessport tune, you can enjoy the benefits of this high-performance fuel while keeping costs manageable. Always remember to monitor your vehicle’s performance and make adjustments as needed to ensure optimal results.