Complete Guide to a 600+ Hp Wrx E85 Conversion: Turbo, Internals, and Supporting Upgrades

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The Subaru WRX is a beloved platform among car enthusiasts, particularly for those looking to extract maximum performance from their vehicles. Converting your WRX to run on E85 fuel can significantly increase horsepower and torque, especially when aiming for over 600 horsepower. This guide will cover the essential upgrades needed for a successful E85 conversion, including turbo options, internal modifications, and supporting upgrades.

Understanding E85 Fuel

E85 is a high-octane fuel blend consisting of approximately 85% ethanol and 15% gasoline. This fuel offers several advantages for performance applications:

  • Higher octane rating allows for more aggressive tuning.
  • Increased cooling properties help manage engine temperatures.
  • Potential for higher horsepower due to more aggressive timing and boost levels.

Turbocharger Options for 600+ HP

The turbocharger is one of the most critical components in achieving 600+ horsepower. Here are some popular turbo options for WRX builds:

  • Garrett GTX3076R: Known for its responsiveness and ability to support high horsepower.
  • Blouch Dominator 1.5XTR: Great for high boost applications and excellent power delivery.
  • FP Black: A popular choice among enthusiasts for its capability to reach high power levels.

Internal Engine Modifications

To safely achieve over 600 horsepower, internal modifications are essential. Here are the key upgrades to consider:

  • Pistons: Upgrade to forged pistons to handle increased power and heat.
  • Connecting Rods: Stronger rods are necessary to withstand the higher loads.
  • Cylinder Head Work: Porting and polishing can improve airflow and efficiency.
  • Head Gaskets: Use multi-layer steel (MLS) gaskets for better sealing under boost.

Supporting Upgrades

Besides the turbo and internal modifications, several supporting upgrades will help ensure your WRX runs smoothly and reliably at 600+ horsepower:

  • Fuel System: Upgrade to larger fuel injectors and a high-flow fuel pump to accommodate E85.
  • Cooling System: Consider an upgraded intercooler and radiator to manage increased heat.
  • Exhaust System: A high-flow exhaust will help reduce back pressure and improve performance.
  • Tuning: A professional tune is essential to optimize performance and ensure reliability.

Conclusion

Converting your WRX to run on E85 and achieve over 600 horsepower is an exciting project that requires careful planning and execution. By selecting the right turbo, making necessary internal modifications, and upgrading supporting components, you can unlock the full potential of your WRX. Remember to prioritize quality parts and professional tuning to ensure that your build is both powerful and reliable.