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The FA20 engine, known for its balanced performance and efficiency, is a favorite among car enthusiasts looking to enhance their vehicles. While turbocharging is a common route for increasing horsepower, many enthusiasts prefer to achieve impressive gains without forced induction. This article explores various performance modifications that can help you reach 200+ horsepower from your naturally aspirated FA20 engine.
Understanding the FA20 Engine
The FA20 is a 2.0-liter flat-four engine developed by Subaru and used in various models, including the Subaru BRZ and Toyota 86. Its design allows for a low center of gravity, contributing to improved handling and driving dynamics. To tap into the engine’s potential, it’s essential to understand its components and how modifications can enhance performance.
Key Performance Modifications
To achieve over 200 horsepower from your FA20 engine without forced induction, consider the following modifications:
- Cold Air Intake: Upgrading to a high-performance cold air intake can improve airflow to the engine, enhancing combustion efficiency and power output.
- High-Performance Exhaust System: A cat-back exhaust system reduces back pressure and allows for better exhaust flow, which can lead to noticeable horsepower gains.
- ECU Tune: Reprogramming the engine’s ECU with a performance tune can optimize fuel maps and ignition timing, unlocking additional power.
- Header Upgrade: Replacing the factory headers with aftermarket options can improve exhaust flow and contribute to increased horsepower.
- High-Performance Camshafts: Upgrading to performance camshafts can improve the engine’s breathing capabilities, resulting in higher RPM power.
- Lightweight Flywheel: A lightweight flywheel reduces rotational mass, allowing the engine to rev more freely and improving throttle response.
- Weight Reduction: Reducing the vehicle’s weight through the removal of unnecessary components can enhance overall performance.
Step-by-Step Modification Guide
1. Cold Air Intake Installation
Installing a cold air intake is one of the simplest modifications you can make. Follow these steps:
- Gather necessary tools: screwdriver, pliers, and the cold air intake kit.
- Remove the factory airbox and intake tubing.
- Install the new intake tube and filter, ensuring all connections are secure.
- Reconnect the MAF sensor and any hoses removed during installation.
2. Exhaust System Upgrade
Upgrading your exhaust system can significantly improve performance. Here’s how to do it:
- Lift the vehicle securely and remove the stock exhaust system.
- Install the new cat-back exhaust system according to the manufacturer’s instructions.
- Ensure all clamps and hangers are tight to prevent leaks.
3. ECU Tuning
ECU tuning is crucial for maximizing the benefits of other modifications. Follow these steps:
- Choose a reputable tuning company or software.
- Connect the tuning device to the OBD-II port.
- Upload the performance tune and follow the prompts.
- Test drive the vehicle to ensure proper function.
4. Header Replacement
Replacing the headers can be challenging but rewarding. Here’s how to do it:
- Remove the engine cover and disconnect the battery.
- Unbolt the factory headers from the engine and exhaust system.
- Install the new headers, ensuring a proper seal.
- Reconnect all components and check for leaks.
5. Camshaft Upgrade
Upgrading camshafts requires more technical skill. Follow these steps:
- Remove the engine cover and timing belt.
- Unbolt the stock camshafts from the cylinder head.
- Install the new camshafts, ensuring correct alignment.
- Reassemble the engine and check timing settings.
Performance Results
After completing these modifications, many FA20 owners report achieving horsepower levels exceeding 200. The combination of improved airflow, optimized tuning, and enhanced engine response contributes to a more exhilarating driving experience.
Conclusion
Achieving over 200 horsepower from a naturally aspirated FA20 engine is entirely possible with the right modifications. By focusing on airflow, exhaust efficiency, and tuning, you can unlock the full potential of your engine. Remember to approach each modification carefully and consider consulting with professionals for more complex installations.