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The Subaru WRX has long been a favorite among performance enthusiasts, and for those looking to push their vehicles to the next level, upgrading the fuel system to accommodate E85 fuel is a popular choice. E85, a blend of 85% ethanol and 15% gasoline, offers several advantages, including higher octane levels and improved performance. To achieve 400 horsepower, specific components are essential for ensuring optimal fuel delivery and engine performance.
Understanding E85 Fuel
E85 fuel can provide significant power increases due to its high octane rating, allowing for more aggressive tuning and timing adjustments. However, it requires specific components to handle the corrosive nature of ethanol and the increased fuel flow needed for higher horsepower applications.
Key Components for E85 Fuel Systems
- Walbro Fuel Pumps
- Upgraded Fuel Lines
- High-Flow Fuel Injectors
Walbro Fuel Pumps
Walbro fuel pumps are renowned for their reliability and performance. When upgrading to an E85-compatible system, selecting the right pump is crucial. The Walbro 450 lph pump is a popular choice for WRX owners aiming for 400 hp. This pump can deliver the necessary fuel volume while maintaining pressure, ensuring optimal performance.
Benefits of Walbro Pumps
- High flow rate to support increased horsepower
- Durable construction for longevity
- Compatible with E85 fuel
Installation Considerations
When installing a Walbro pump, it is essential to ensure proper fitment within the fuel tank. You may need an installation kit that includes necessary hardware and wiring modifications. It’s also advisable to check for any potential fuel leaks post-installation.
Upgraded Fuel Lines
Standard fuel lines may not withstand the corrosive effects of E85. Upgrading to ethanol-resistant fuel lines is essential for maintaining fuel integrity and preventing leaks. Teflon-lined or stainless steel braided lines are excellent options for those looking to upgrade.
Choosing the Right Fuel Lines
- Teflon-lined hoses for chemical resistance
- Stainless steel braided for durability
- Proper diameter to match fuel pump and injectors
Installation Tips
During installation, ensure that all connections are secure and that there are no kinks in the lines. It’s also a good idea to replace any old clamps with new ones to prevent future leaks.
High-Flow Fuel Injectors
To achieve the desired fuel flow for 400 hp, high-flow fuel injectors are necessary. These injectors must be compatible with E85 and capable of delivering the increased volume needed for high-performance applications. Options like the Injector Dynamics ID1050X are popular among WRX enthusiasts.
Benefits of High-Flow Injectors
- Increased fuel delivery for higher horsepower
- Improved atomization for better combustion
- Compatibility with E85 for optimal performance
Installation and Tuning
Installing high-flow injectors requires careful attention to detail. Ensure that the injectors are seated properly and that all electrical connections are secure. Once installed, a proper tune is essential to take full advantage of the upgraded fuel system. This tuning process will ensure that the engine runs efficiently and safely on E85.
Conclusion
Upgrading the fuel system of a Subaru WRX to accommodate E85 fuel is a significant step for those aiming for 400 horsepower. By selecting quality components such as Walbro fuel pumps, upgraded fuel lines, and high-flow fuel injectors, enthusiasts can ensure their vehicles perform at their best. Proper installation and tuning are vital to maximizing the benefits of these upgrades and achieving the desired performance.