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The Subaru BRZ is known for its lightweight chassis and agile handling, but enthusiasts often crave more power. One of the most effective ways to boost performance is by upgrading to a turbocharger. In this article, we will explore the process of building a BRZ FA20 engine from stock to over 350 horsepower using Garrett GTX series turbochargers.
Understanding the FA20 Engine
The FA20 engine is a 2.0-liter flat-four that delivers a balanced combination of power and efficiency. While the stock version produces around 200 horsepower, it has significant potential for tuning and modifications. Understanding its components is essential for a successful turbo build.
- Engine Block: The foundation of the FA20, made from aluminum for weight savings.
- Pistons and Rods: Designed for a high compression ratio, but may need upgrading for turbo applications.
- Cylinder Heads: Features dual overhead camshafts and variable valve timing for improved performance.
- Intake and Exhaust Systems: Critical for airflow; stock components can be restrictive.
Selecting the Right Turbocharger
Choosing the right turbocharger is crucial for achieving your horsepower goals. The Garrett GTX series offers a range of options suitable for the FA20 engine. Here’s what to consider:
- Turbo Size: Larger turbos can produce more power but may introduce lag.
- Compressor Efficiency: Look for a turbo that maintains efficiency at higher boost levels.
- Wastegate Type: Internal vs. external wastegates can affect boost control.
Building the Turbo System
Once you have selected your turbocharger, the next step is to build the turbo system. This includes the following components:
- Turbo Manifold: Custom or aftermarket options are available to fit the Garrett turbo.
- Intercooler: Essential for cooling the compressed air before it enters the engine.
- Piping: High-quality aluminum or stainless steel piping is recommended for durability.
- Fuel System: Upgrading fuel injectors and pump is necessary to support increased power.
Engine Management and Tuning
To safely run a turbocharged setup, proper engine management is vital. This involves tuning the engine to accommodate the new turbo system and ensure optimal performance.
- ECU Reflash: A custom tune is necessary to adjust fuel maps and ignition timing.
- Boost Control: Implementing a boost controller helps manage turbo pressure.
- Monitoring: Use gauges to keep an eye on boost levels, air-fuel ratios, and engine temperatures.
Performance Upgrades
In addition to the turbo system, several performance upgrades can enhance the overall driving experience. Consider the following:
- Exhaust System: A high-flow exhaust will reduce back pressure and improve sound.
- Suspension Upgrades: Stiffer springs and dampers can help manage the increased power.
- Braking System: Upgrading to larger brakes ensures stopping power matches the new performance levels.
Final Thoughts
Building a Subaru BRZ FA20 engine from stock to over 350 horsepower with Garrett GTX series turbochargers is an exciting project that requires careful planning and execution. By selecting the right components and tuning the engine effectively, you can achieve impressive performance gains while maintaining reliability.
Whether you are a seasoned mechanic or a novice enthusiast, this turbo build can transform your BRZ into a thrilling performance machine.