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The Subaru WRX is a popular choice among car enthusiasts for its performance and tuning potential. In this article, we will explore how to build a 500 horsepower WRX using E85 fuel, focusing on key components such as turbochargers, pistons, and supporting modifications.
Understanding E85 Fuel
E85 is a blend of 85% ethanol and 15% gasoline, providing a higher octane rating than traditional pump gas. This allows for more aggressive tuning and greater power output. However, there are several factors to consider when converting a WRX to run on E85.
- Higher fuel flow requirements
- Increased risk of corrosion
- Potential changes in fuel mapping
Choosing the Right Turbocharger
The turbocharger is a critical component for achieving 500 horsepower. Selecting the right turbo involves balancing size, efficiency, and response time.
Popular Turbo Options
- BorgWarner EFR Series
- Garrett GTX Series
- FP Green Turbo
Each of these options offers a combination of performance and reliability. Considerations include boost threshold, lag, and overall power potential.
Upgrading Pistons for Durability
To handle the increased power and stress from E85, upgrading the pistons is essential. Stock pistons may not withstand the higher cylinder pressures and temperatures.
Recommended Piston Options
- CP-Carrillo Pistons
- Wiseco Forged Pistons
- Manley Performance Pistons
These aftermarket pistons are designed to provide enhanced strength and durability, making them suitable for high-performance applications.
Supporting Modifications
In addition to the turbocharger and pistons, several supporting modifications are necessary to ensure the WRX can reliably achieve 500 horsepower on E85.
Essential Supporting Mods
- Fuel pump upgrade
- Fuel injectors
- Intercooler upgrade
- Exhaust system
- Tune for E85
Upgrading the fuel pump and injectors is crucial to provide the necessary fuel flow for higher horsepower. An upgraded intercooler will help manage intake temperatures, while a performance exhaust system enhances exhaust flow.
Tuning for Maximum Performance
After all modifications are complete, proper tuning is essential to maximize performance and ensure reliability. A professional tuner can adjust fuel maps, ignition timing, and boost levels to optimize the setup.
- Dyno tuning for precise adjustments
- Monitoring air-fuel ratios
- Adjusting for E85 characteristics
Conclusion
Building a 500 horsepower WRX with E85 conversion involves careful selection of components and modifications. By upgrading the turbocharger, pistons, and supporting mods, along with proper tuning, you can achieve impressive performance while maintaining reliability.