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The Subaru WRX has long been a favorite among automotive enthusiasts, thanks to its rally heritage and turbocharged performance. The FA20 engine, which powers many of the newer WRX models, offers a solid foundation for tuning and performance upgrades. In this article, we will compare the power gains achieved by using the stock turbocharger versus aftermarket options.
Understanding the FA20 Engine
The FA20 engine is a 2.0-liter flat-four engine that features a turbocharger. This engine is known for its balance of power and efficiency, making it a popular choice for both daily drivers and performance enthusiasts. Understanding its capabilities is essential when considering upgrades.
Stock Turbocharger Performance
The stock turbocharger on the FA20 engine is designed to provide a good balance of power and reliability. It delivers a maximum boost pressure of around 16.5 psi, resulting in approximately 268 horsepower and 258 lb-ft of torque at the crank. This setup is sufficient for most drivers, especially those who prioritize reliability and drivability.
Power Gains with Stock Turbo
While the stock turbocharger provides decent performance, enthusiasts often seek more power. With simple modifications like an upgraded intercooler and a proper tune, power gains can be realized without replacing the turbo. Typical gains include:
- Increase to approximately 300 horsepower
- Torque increases to around 280 lb-ft
Aftermarket Turbocharger Options
Aftermarket turbochargers come in various sizes and designs, allowing for significant performance enhancements. Popular options include the Garrett, BorgWarner, and ETS turbochargers. These aftermarket turbos can provide much higher boost levels and improved airflow, resulting in substantial power gains.
Performance Gains with Aftermarket Turbo
When installing an aftermarket turbocharger, the potential power gains can be impressive. Depending on the specific turbo and supporting modifications, power outputs can reach:
- Up to 400 horsepower with proper tuning
- Torque figures can exceed 350 lb-ft
Factors to Consider When Upgrading
Before deciding between the stock and an aftermarket turbocharger, several factors should be considered:
- Budget: Aftermarket options can be expensive, including installation and tuning costs.
- Goals: Identify whether you want a daily driver or a track-focused vehicle.
- Reliability: Consider how much power you want without sacrificing engine longevity.
- Support Mods: Upgrading the turbo often requires additional modifications like fuel injectors, intercoolers, and exhaust systems.
Conclusion
In summary, the choice between a stock turbocharger and an aftermarket option for the Subaru WRX’s FA20 engine comes down to personal preference, budget, and performance goals. The stock turbo provides a reliable and sufficient power level for many drivers, while aftermarket turbos offer significant potential for those seeking higher performance. Ultimately, understanding your needs will guide you to the right decision.