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The Subaru EJ257 engine is a popular choice among performance enthusiasts, particularly for those looking to build a high-output machine. With the right modifications and components, achieving 700 horsepower is within reach. This article will guide you through the essential high-performance internals from Manley and a comprehensive supporting modification list to help you realize your performance goals.
Understanding the EJ257 Engine
The EJ257 is a 2.5-liter flat-four engine known for its robust design and potential for high horsepower. It features a turbocharged configuration, making it a favored choice for tuners looking to extract maximum performance. However, reaching the 700 hp mark requires careful selection of internal components and supporting modifications.
High-Performance Internals from Manley
Manley Performance Products is renowned for manufacturing high-quality engine components designed for extreme performance. When building a 700 hp EJ257, consider the following internals:
- Manley Forged Pistons: These pistons are designed to withstand high boost and extreme temperatures, essential for high-output builds.
- Manley H-Beam Connecting Rods: Strong and lightweight, these rods are perfect for handling the increased power and RPMs.
- Manley Performance Crankshaft: A forged crankshaft will provide the necessary strength and reliability for high horsepower applications.
- Manley Valve Springs and Retainers: Upgraded valve springs will ensure proper valve control at high RPMs, preventing float.
- Manley Performance Cylinder Head Components: Upgrading your heads with Manley valves and guides will improve airflow and performance.
Supporting Modifications
In addition to high-performance internals, various supporting modifications are crucial for achieving and maintaining 700 hp. Here’s a detailed list:
- Upgraded Turbocharger: A larger turbo will provide the necessary boost to reach your power goals. Consider options like the Garrett GTX series or the Precision Turbo units.
- High-Flow Fuel Injectors: To support increased fuel demands, upgrade to larger injectors (1000cc or more) to ensure proper fuel delivery.
- Fuel Pump Upgrade: A high-performance fuel pump is essential for maintaining adequate fuel pressure under boost.
- Aftermarket Engine Management System: A standalone ECU or a high-quality tuning solution will allow for precise tuning of your engine.
- Intercooler Upgrade: A larger front-mount intercooler will help reduce intake temperatures, improving performance and reliability.
- Exhaust System: A high-flow exhaust will reduce back pressure and improve turbo spool time.
- Upgraded Clutch: A performance clutch will handle the increased power and torque effectively.
- Cooling System Enhancements: An upgraded radiator and oil cooler will help maintain optimal operating temperatures.
- Suspension and Brake Upgrades: With increased power, upgrading your suspension and brakes is vital for handling and safety.
Building the Engine
When building your EJ257 for 700 hp, meticulous attention to detail is crucial. Follow these steps to ensure a successful build:
- Disassembly: Carefully disassemble the engine, marking parts for organization.
- Cleaning: Clean all components thoroughly to remove any debris or contaminants.
- Inspection: Inspect all parts for wear and damage, replacing any that do not meet specifications.
- Machining: If necessary, machine the block and heads for optimal performance.
- Assembly: Follow proper torque specifications and assembly procedures to ensure reliability.
Tuning and Testing
After building your engine, tuning is critical to achieving the desired power output. Consider the following:
- Dyno Tuning: Use a dynamometer to fine-tune your engine’s performance, ensuring optimal air-fuel ratios and ignition timing.
- Monitor Parameters: Keep an eye on critical parameters such as boost levels, exhaust gas temperatures, and oil pressure.
- Test Drive: Conduct thorough test drives to assess performance and reliability under various conditions.
Conclusion
Building a 700 hp EJ257 is an ambitious project that requires careful planning and execution. By selecting high-performance internals from Manley and following a comprehensive supporting mod list, you can achieve your horsepower goals while ensuring your engine’s reliability. Remember to pay close attention to tuning and testing to maximize performance and enjoyment.