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The FA20 engine, known for its performance and efficiency, has gained popularity among automotive enthusiasts, particularly in the Subaru community. One of the most common upgrades for this engine is the turbocharger, which can significantly enhance horsepower and overall performance. This article will explore the horsepower gains from upgrading the turbocharger from the VF39 to the VF48.
Understanding the FA20 Engine
The FA20 engine is a flat-four engine developed by Subaru, featuring a lightweight design and a balance of power and efficiency. It is commonly found in models such as the Subaru BRZ and Toyota 86. The engine’s turbocharged variants, particularly the FA20DIT, have made it a favorite for tuning and performance upgrades.
Turbocharger Basics
A turbocharger is a device that increases an engine’s efficiency and power output by forcing extra air into the combustion chamber. This process allows for more fuel to be burned, resulting in increased horsepower. The VF39 and VF48 are both turbochargers used with the FA20 engine, but they have different specifications and performance characteristics.
VF39 Turbocharger
The VF39 is a popular turbocharger choice for the FA20 engine, known for its reliability and performance. It is capable of producing around 280-300 horsepower, depending on supporting modifications and tuning. The VF39 provides a good balance between spool time and peak power, making it suitable for both daily driving and spirited performance.
VF48 Turbocharger
The VF48 is an upgrade from the VF39, designed to provide higher horsepower and improved efficiency. It can produce approximately 300-350 horsepower, depending on the same factors that affect the VF39. The VF48 features a larger compressor and turbine, which allows for better airflow and power delivery at higher RPMs.
Comparing Horsepower Gains
When upgrading from the VF39 to the VF48, many enthusiasts want to know the potential horsepower gains. The actual increase in horsepower can vary based on several factors, including engine tuning, supporting modifications, and the specific vehicle setup.
- Engine tuning: Proper tuning is essential to maximize the benefits of a turbocharger upgrade.
- Supporting modifications: Upgrades such as intercoolers, exhaust systems, and fuel injectors can significantly impact performance.
- Vehicle weight and drivetrain: The overall weight and drivetrain setup can influence how much power is effectively used.
Estimated Horsepower Gains
Based on various tuning experiences and dyno results, upgrading from the VF39 to the VF48 can yield an estimated gain of:
- Approximately 20-50 additional horsepower.
This range can vary widely depending on the specific setup and modifications made to the vehicle. Some users report gains at the lower end, while others with extensive modifications may see higher increases.
Factors Influencing Performance
Several factors can influence the performance of the FA20 engine when upgrading the turbocharger:
- Tuning: A proper tune is critical for ensuring that the engine runs optimally with the new turbocharger.
- Fuel Quality: Higher octane fuel can allow for more aggressive tuning, leading to increased horsepower.
- Airflow: Upgrading the intake and exhaust systems can improve airflow, further enhancing performance.
Conclusion
Upgrading the turbocharger from the VF39 to the VF48 on the FA20 engine can provide a significant boost in horsepower. While the estimated gains range from 20-50 horsepower, the actual increase will depend on various factors, including tuning, supporting modifications, and vehicle setup. Enthusiasts looking to maximize their FA20 engine’s performance should consider these factors when planning their upgrades.