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The EJ255 engine, a turbocharged flat-four, has garnered attention for its performance potential. In this article, we will explore the real-world dyno results comparing the performance of the EJ255 in both stock and modified configurations, specifically focusing on achieving over 370 horsepower.
Understanding the EJ255 Engine
The EJ255 is part of Subaru’s EJ engine family, known for its reliability and performance. This engine features a DOHC design and comes equipped with a turbocharger, which significantly enhances its power output. Let’s delve into the specifications and features that make the EJ255 a popular choice among enthusiasts.
- Engine Type: 2.5L Turbocharged Flat-Four
- Power Output: Stock rated at approximately 250 hp
- Torque: 250 lb-ft
- Fuel System: Multi-Point Fuel Injection
Stock EJ255 Performance
In its stock form, the EJ255 delivers respectable performance, but many enthusiasts seek to unlock more power. The following dyno results illustrate the stock performance metrics:
- Peak Horsepower: 250 hp at 6,000 RPM
- Peak Torque: 250 lb-ft at 3,600 RPM
- 0-60 mph: Approximately 5.5 seconds
Modified EJ255 Performance
With modifications, the EJ255 can achieve impressive power figures. The following modifications were made to reach 370+ hp:
- Upgraded Turbocharger
- High-Performance Intercooler
- Performance Exhaust System
- ECU Tune
After implementing these modifications, the dyno results were significantly improved:
- Peak Horsepower: 375 hp at 6,500 RPM
- Peak Torque: 360 lb-ft at 4,000 RPM
- 0-60 mph: Approximately 4.8 seconds
Real-World Dyno Comparisons
To provide a comprehensive understanding of the performance differences, several dyno runs were conducted. Below are the comparisons between stock and modified setups:
- Stock Dyno Run: 250 hp vs. Modified Dyno Run: 375 hp
- Torque Comparison: Stock 250 lb-ft vs. Modified 360 lb-ft
- Acceleration Improvement: Stock 0-60 mph in 5.5 seconds vs. Modified 4.8 seconds
Factors Influencing Performance
Several factors can influence the performance of the EJ255, both in stock and modified forms. Understanding these factors is crucial for enthusiasts looking to optimize their vehicles:
- Quality of Modifications: The type and quality of aftermarket parts can significantly impact performance.
- Tuning: Proper ECU tuning is essential to maximize power and ensure engine safety.
- Environmental Conditions: Temperature and altitude can affect dyno results.
Conclusion
The EJ255 engine, when modified correctly, can deliver impressive performance exceeding 370 hp. The real-world dyno results highlight the significant gains achievable through thoughtful upgrades. For enthusiasts, understanding the balance between modifications and tuning is key to unlocking the full potential of this remarkable engine.