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The Subaru GD WRX is a beloved platform among car enthusiasts, known for its rally heritage and impressive performance. However, to push the limits of power beyond 500 horsepower, significant upgrades are necessary, particularly to the intercooler and fuel system. This article will explore the best practices for maximizing the power of your GD WRX through these critical upgrades.
Understanding the Importance of Intercoolers
The intercooler plays a vital role in the performance of turbocharged engines. It cools the air compressed by the turbocharger, increasing its density and allowing for more oxygen to enter the engine. This results in better combustion and more power. Upgrading the intercooler is essential when aiming for higher horsepower.
Types of Intercoolers
- Front-Mount Intercoolers (FMIC): These are larger and provide better airflow, making them ideal for high horsepower builds.
- Top-Mount Intercoolers (TMIC): Easier to install but may not provide sufficient cooling for extreme power levels.
Selecting the Right Intercooler
When choosing an intercooler for your GD WRX, consider the following factors:
- Size: A larger core can handle more air and reduce temperatures more effectively.
- Material: Look for aluminum construction for lightweight and efficient heat dissipation.
- End Tank Design: Efficient designs minimize pressure drop and maximize airflow.
Upgrading the Fuel System
To support 500+ horsepower, the fuel system must provide adequate fuel flow and pressure. This involves upgrading the fuel pump, injectors, and lines.
Fuel Pump Upgrades
The stock fuel pump may not be sufficient for high horsepower. Upgrading to a high-flow aftermarket pump is crucial. Consider the following options:
- Walbro 255: A popular choice that provides a significant increase in fuel flow.
- DeatschWerks 300: Offers even higher flow rates for extreme builds.
Fuel Injector Selection
Fuel injectors must also be upgraded to handle the increased fuel demands. When selecting injectors, consider:
- Size: Aim for injectors that can support at least 1000cc/min for high horsepower builds.
- Brand: Brands like Injector Dynamics and DeatschWerks are known for quality and performance.
Tuning for Maximum Performance
After upgrading the intercooler and fuel system, proper tuning is essential to maximize performance. A custom tune will ensure that your engine runs efficiently and safely at higher power levels.
Choosing a Tuner
Select a tuner who specializes in Subaru vehicles and has experience with high horsepower builds. Look for:
- Experience: Ensure they have a proven track record with GD WRX builds.
- Dyno Testing: A reputable tuner will use a dyno to fine-tune your setup for optimal performance.
Conclusion
Maximizing the power of your GD WRX to over 500 horsepower is an achievable goal with the right upgrades. By focusing on the intercooler and fuel system, along with proper tuning, you can unlock the full potential of your vehicle. Remember to choose quality components and work with experienced professionals to ensure your build is both powerful and reliable.