Fa20 Engine Swap Guide: Installing a Subaru Wrx 2.0l Turbo into Your Brz

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The FA20 engine swap is a popular modification for enthusiasts looking to enhance the performance of their Subaru BRZ. By installing a Subaru WRX 2.0L turbo engine, you can significantly increase power and torque, resulting in a more thrilling driving experience. This guide will provide a comprehensive overview of the steps involved in this engine swap, ensuring that you are well-prepared for the task ahead.

Understanding the FA20 Engine

The FA20 engine is a 2.0L flat-four engine that powers both the Subaru BRZ and the Toyota 86. It features a naturally aspirated design, which provides a balanced performance but lacks the power of a turbocharged engine. Upgrading to the WRX 2.0L turbo engine offers several advantages:

  • Increased horsepower: The WRX engine produces significantly more horsepower than the FA20.
  • Enhanced torque: Turbocharging provides a boost in torque, improving acceleration.
  • Better tuning potential: Turbo engines offer more room for performance upgrades.

Preparing for the Swap

Before you begin the swap, proper preparation is essential. Follow these steps to ensure a smooth process:

  • Research: Familiarize yourself with the components and requirements of the WRX engine swap.
  • Gather tools: Ensure you have all necessary tools, including wrenches, sockets, and an engine hoist.
  • Purchase parts: Acquire the WRX engine, transmission, and any additional components needed for the swap.

Required Parts and Tools

Having the right parts and tools is crucial for a successful engine swap. Here’s a list of what you will need:

  • WRX 2.0L turbo engine: Ensure it is in good condition.
  • Transmission: Typically, the WRX transmission will be required.
  • ECU: The WRX ECU is necessary for proper engine management.
  • Wiring harness: A compatible wiring harness for the turbo engine.
  • Exhaust system: An upgraded exhaust may be needed to fit the turbo setup.
  • Cooling system: Ensure the radiator and intercooler are compatible.
  • Tools: Engine hoist, socket set, wrenches, and other hand tools.

Step-by-Step Engine Swap Process

Step 1: Remove the Existing Engine

Begin by safely removing the existing FA20 engine from your BRZ. Follow these steps:

  • Disconnect the battery and remove any electrical connections.
  • Drain the fluids, including oil and coolant.
  • Remove the intake and exhaust components.
  • Detach the transmission from the engine.
  • Use the engine hoist to lift and remove the engine from the bay.

Step 2: Prepare the WRX Engine

Once the FA20 is out, prepare the WRX engine for installation:

  • Inspect the engine for any damage or wear.
  • Transfer necessary components, such as the turbo and intercooler.
  • Install the WRX wiring harness and ECU.
  • Ensure all connections are secure and ready for installation.

Step 3: Install the WRX Engine

With the WRX engine prepared, it’s time to install it into the BRZ:

  • Position the engine hoist over the engine bay.
  • Carefully lower the WRX engine into place, aligning it with the transmission.
  • Secure the engine mounts to hold the engine in place.
  • Reconnect the transmission to the engine.

Step 4: Connect Electrical Systems

After the engine is secured, connect the electrical systems:

  • Attach the wiring harness to the engine components.
  • Connect the battery and ensure all electrical connections are secure.
  • Check for any error codes or issues with the ECU.

Step 5: Finalize the Installation

With everything connected, finalize the installation:

  • Install the intake and exhaust systems.
  • Fill the engine with oil and coolant.
  • Double-check all connections and mounts.
  • Start the engine and monitor for any issues.

Post-Swap Considerations

After completing the engine swap, there are several considerations to keep in mind:

  • Tuning: A professional tune is recommended to optimize performance.
  • Maintenance: Regular maintenance checks are crucial for turbo engines.
  • Insurance: Update your insurance policy to reflect the modifications.

Conclusion

The FA20 engine swap to a Subaru WRX 2.0L turbo engine is a rewarding project that can significantly enhance your BRZ’s performance. By following this guide and ensuring proper preparation, you can successfully complete the swap and enjoy the benefits of increased power and torque. Always remember to prioritize safety and consult professionals when necessary.