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The Subaru EJ255 engine is known for its robust performance and tuning potential. Many enthusiasts aim to boost its power output to impressive levels, with 450 horsepower being a popular target. This article explores the best turbo upgrades available, focusing on options from the VF48 to the FP Red Series, highlighting their features, benefits, and suitability for achieving that 450 HP goal.
Understanding the EJ255 Engine
The EJ255 is a turbocharged flat-four engine found in various Subaru models. Known for its durability and tuning capabilities, this engine can handle significant power upgrades with the right modifications. Before diving into turbo upgrades, it’s essential to understand the engine’s specifications and capabilities.
- Displacement: 2.5 liters
- Configuration: Flat-four (horizontally opposed)
- Stock horsepower: Approximately 250 HP
- Stock torque: Around 250 lb-ft
Why Upgrade to a Bigger Turbo?
Upgrading to a larger turbocharger can significantly increase the engine’s airflow, allowing for higher horsepower and torque outputs. A bigger turbo can help achieve the desired 450 HP by optimizing the air-fuel mixture and improving combustion efficiency. Key benefits of upgrading include:
- Increased horsepower and torque
- Better throttle response
- Enhanced performance at higher RPMs
- Improved overall engine efficiency
Turbo Upgrade Options
VF48 Turbo
The VF48 turbo is a popular choice among Subaru enthusiasts looking for a straightforward upgrade. It offers a good balance of performance and reliability, making it suitable for daily driving and spirited performance.
- Power Output: Up to 330 HP
- Boost Pressure: 18-20 psi
- Response: Quick spool time
- Installation: Direct fit with minimal modifications
FP Green Turbo
The FP Green turbo is a step up from the VF48, designed for those seeking more power without sacrificing daily drivability. This turbo can support higher boost levels and is often recommended for those aiming for around 400 HP.
- Power Output: Up to 400 HP
- Boost Pressure: 20-24 psi
- Response: Good spool with increased top-end power
- Installation: Requires some modifications for optimal fit
FP Red Turbo
The FP Red turbo is a high-performance option designed specifically for those who want to push their EJ255 to the limits. With the capability to achieve 450 HP, this turbo is ideal for track enthusiasts and serious tuners.
- Power Output: Up to 450 HP
- Boost Pressure: 24-30 psi
- Response: Excellent spool characteristics
- Installation: May require additional upgrades to support high power
Supporting Modifications
To fully realize the potential of a turbo upgrade, several supporting modifications are necessary. These upgrades ensure that the engine can handle increased power levels safely and reliably.
- Upgraded intercooler for better cooling
- High-flow fuel injectors to support increased fuel demand
- Performance fuel pump for consistent fuel delivery
- ECU tuning to optimize air-fuel ratios and boost control
- Upgraded exhaust system to reduce back pressure
Conclusion
Boosting the EJ255 to 450 HP is an achievable goal with the right turbo upgrades and supporting modifications. Whether you choose the VF48 for a reliable increase or the FP Red for maximum power, each option has its benefits. Always ensure that your vehicle is properly tuned and that all supporting modifications are in place to enjoy the full benefits of your turbo upgrade.