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The Subaru EJ25 engine has long been a favorite among automotive enthusiasts for its reliability and performance potential. One of the most effective ways to unlock additional horsepower from this engine is through the process of porting and polishing the cylinder heads. In this article, we will explore how you can achieve real-world results, specifically a gain of 50 horsepower, for under $1,000.
Understanding Porting and Polishing
Porting and polishing is a technique used to improve the airflow in an engine’s cylinder head. By modifying the intake and exhaust ports, you can enhance the engine’s efficiency and performance. Here’s a breakdown of the process:
- Porting: This involves removing material from the ports to increase their size and improve airflow.
- Polishing: This is the smoothing of the surfaces to reduce turbulence and enhance airflow even further.
Benefits of Porting and Polishing a Subaru EJ25 Head
Porting and polishing the EJ25 head offers several benefits that contribute to increased horsepower and overall engine performance. Some key advantages include:
- Increased Airflow: Improved airflow leads to better combustion, which translates to more power.
- Enhanced Throttle Response: The engine can breathe better, resulting in quicker acceleration.
- Better Fuel Efficiency: More efficient combustion can lead to improved fuel economy.
The Cost of Porting and Polishing
One of the most appealing aspects of porting and polishing is that it can be done relatively affordably. Here’s a breakdown of potential costs:
- Cylinder Head Removal: $100 – $200
- Porting and Polishing Services: $500 – $700
- Gaskets and Miscellaneous Parts: $100 – $200
Overall, you can expect to spend between $700 and $1,100, keeping it under the $1,000 mark if you shop wisely.
Finding the Right Shop
Choosing the right shop for porting and polishing is crucial to achieving the desired results. Here are some tips for selecting a reputable service:
- Research: Look for shops with good reviews and a track record of successful work on Subaru engines.
- Ask for References: Speak to previous customers about their experiences.
- Check Qualifications: Ensure the technicians are experienced and knowledgeable about the EJ25 engine.
Real-World Results: Dyno Testing
After completing the porting and polishing process, it’s essential to validate the results through dyno testing. Here’s what you can expect:
- Baseline Dyno Run: Measure the initial horsepower and torque before modifications.
- Post-Modification Dyno Run: After porting and polishing, run the engine on the dyno again to measure improvements.
- Expected Gains: Many enthusiasts report gains of 40 to 50 horsepower from this process.
Conclusion
Porting and polishing the Subaru EJ25 head is a proven method to unlock significant horsepower gains without breaking the bank. With careful planning, research, and execution, you can achieve a remarkable boost in performance for under $1,000. Whether you’re a weekend warrior or a daily driver, these enhancements can make a noticeable difference in your driving experience.