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The Subaru WRX is a popular choice among car enthusiasts, especially for those looking to enhance performance. One critical component in boosting horsepower is the intercooler. This guide will help you understand how to select the right intercooler size for achieving 350+ horsepower.
Understanding Intercoolers
An intercooler is essential for cooling the air compressed by the turbocharger before it enters the engine. Cooler air is denser, allowing for more oxygen and, consequently, more fuel to be burned, which translates to increased horsepower.
Types of Intercoolers
- Air-to-Air Intercoolers: These use ambient air to cool the compressed air from the turbo. They are efficient and commonly used in WRX builds.
- Air-to-Water Intercoolers: These utilize water to cool the compressed air, providing better cooling efficiency but requiring additional plumbing.
Factors to Consider When Selecting an Intercooler
- Size: The size of the intercooler affects its cooling efficiency. A larger intercooler can dissipate heat better but may require modifications to fit.
- Core Design: The design of the intercooler core, such as bar-and-plate or tube-and-fin, influences airflow and cooling properties.
- Material: Most intercoolers are made of aluminum, which is lightweight and effective at heat dissipation.
- Pressure Drop: A good intercooler should minimize pressure drop to maintain turbo efficiency.
Recommended Intercooler Sizes for 350+ Horsepower
For a Subaru WRX aiming for 350+ horsepower, the intercooler size is crucial. Here are some recommended sizes:
- Front Mount Intercoolers (FMIC): Typically range from 24 to 30 inches in width. This size is ideal for maximizing airflow and cooling efficiency.
- Top Mount Intercoolers (TMIC): Should have a core size of at least 3 inches thick to ensure adequate cooling for higher horsepower applications.
Installation Considerations
Installing a new intercooler can be straightforward but may require some modifications. Here are a few tips:
- Fitment: Ensure the intercooler fits without obstructing other components. Check for space in the engine bay.
- Plumbing: Depending on the intercooler type, you may need to reroute piping. Use high-quality silicone couplers and clamps.
- Mounting: Securely mount the intercooler to prevent movement, which can lead to damage over time.
Performance Tuning After Installation
After installing a new intercooler, it’s essential to tune your WRX for optimal performance. This ensures that the engine management system is calibrated to take full advantage of the new intercooler’s capabilities.
ECU Tuning
Consider using a reputable ECU tuning service to adjust fuel maps and boost levels. This will help maximize horsepower and ensure engine safety.
Dyno Testing
After tuning, it’s advisable to get your WRX on a dynamometer. This will provide precise horsepower and torque figures, allowing you to see the effectiveness of your intercooler upgrade.
Common Mistakes to Avoid
- Choosing the Wrong Size: A too-small intercooler can lead to overheating and reduced performance.
- Neglecting Other Upgrades: Ensure your supporting mods, like exhaust and intake, are also upgraded to match your intercooler.
- Skipping Tuning: Failing to tune your vehicle after installation can lead to engine damage.
Conclusion
Selecting the right intercooler for your Subaru WRX is vital for achieving and maintaining 350+ horsepower. By understanding the types, sizes, and installation considerations, you can make an informed decision that enhances your vehicle’s performance. Remember to tune your car after installation for optimal results.