Best Cooling Upgrades for Wrx Built Engines: Intercoolers, Oil Coolers, and Radiators

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The Subaru WRX is celebrated for its performance and tuning potential, especially when it comes to building high-powered engines. One critical aspect of enhancing performance is ensuring optimal cooling. Upgrading the cooling system can significantly improve engine longevity and performance. This article explores the best cooling upgrades for WRX built engines, focusing on intercoolers, oil coolers, and radiators.

Importance of Cooling Upgrades

When tuning a WRX engine, increased power output generates more heat. Without adequate cooling, this can lead to engine knock, reduced performance, and potential damage. Upgrading the cooling system is essential for maintaining efficiency and reliability.

Intercoolers

Intercoolers play a vital role in reducing the temperature of the air entering the engine. Cooler air is denser, allowing for more oxygen and improved combustion efficiency. Here are some of the best intercooler options for WRX built engines:

  • Top Mount Intercoolers (TMIC): These are popular due to their compact design and ease of installation. Brands like Cobb and Mishimoto offer high-performance options.
  • Front Mount Intercoolers (FMIC): FMICs provide superior cooling efficiency by allowing the air to travel a longer distance, which cools it more effectively. Options from companies like ETS and Process West are highly regarded.
  • Water-to-Air Intercoolers: These systems use water to cool the intake air, offering excellent cooling performance. They are more complex but can be very effective, especially in high-power applications.

Choosing the Right Intercooler

When selecting an intercooler, consider the following factors:

  • Size: Ensure the intercooler fits within your engine bay without obstructing other components.
  • Material: Look for intercoolers made from lightweight materials like aluminum for better heat dissipation.
  • Core Design: The design of the core can affect airflow and cooling efficiency. Bar and plate designs are generally more efficient than tube and fin designs.

Oil Coolers

Oil coolers are essential for maintaining optimal oil temperatures, especially in high-performance engines. They help prevent oil breakdown and maintain viscosity, which is crucial for engine protection. Here are some top oil cooler options for WRX built engines:

  • External Oil Coolers: These systems can be mounted in various locations within the engine bay. Brands like Setrab and Mishimoto offer reliable external coolers.
  • Thermostatic Oil Coolers: These coolers come with a thermostat that regulates oil temperature, ensuring it reaches optimal levels quickly while preventing overcooling.
  • Oil Cooler Kits: Complete kits that include all necessary components for installation make upgrading easier. Look for kits from reputable brands that fit your WRX model.

Benefits of Upgrading Oil Coolers

Upgrading your oil cooler provides several benefits:

  • Improved Oil Temperature Control: Keeps oil temperatures within an optimal range, enhancing engine performance.
  • Extended Engine Life: Reduces wear on engine components by maintaining proper lubrication temperatures.
  • Enhanced Performance: Supports higher power outputs by ensuring consistent oil quality and performance.

Radiators

The radiator is a crucial component of the cooling system, responsible for dissipating heat from the engine coolant. Upgrading the radiator can significantly enhance cooling efficiency, especially in modified engines. Here are some recommended radiators for WRX built engines:

  • Aluminum Radiators: These are lightweight and provide excellent heat dissipation. Brands like Mishimoto and Koyorad offer high-performance aluminum radiators.
  • High-Performance Radiators: Designed specifically for racing applications, these radiators offer increased cooling capacity and improved flow rates.
  • Radiator Fans: Upgrading to high-performance fans can improve airflow through the radiator, enhancing cooling efficiency.

Factors to Consider When Choosing a Radiator

When selecting a radiator for your WRX, keep these factors in mind:

  • Cooling Capacity: Ensure the radiator can handle the increased heat output of your built engine.
  • Fitment: Check compatibility with your specific WRX model to avoid installation issues.
  • Material: Aluminum is preferred for its lightweight and efficient heat transfer properties.

Conclusion

Upgrading the cooling system in a WRX built engine is essential for maximizing performance and reliability. By investing in high-quality intercoolers, oil coolers, and radiators, you can ensure your engine operates within optimal temperature ranges. This not only enhances performance but also extends the lifespan of your engine components. Whether you are a casual driver or a serious enthusiast, these upgrades are worth considering for any WRX build.