Turbo Size and Supporting Mods for 5.7 Hemi: from 500 Hp to 700+ Hp

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The 5.7 HEMI engine is well-known for its impressive performance and capability. To take this powerhouse from 500 horsepower to over 700 horsepower, turbocharging is a popular modification. Understanding the right turbo size and supporting modifications is crucial for achieving optimal performance.

Understanding Turbo Size

Choosing the right turbo size is essential for maximizing horsepower while ensuring engine reliability. Here are some key factors to consider:

  • Compressor Size: A larger compressor can move more air, which is necessary for higher horsepower.
  • Turbine Size: The turbine must be appropriately sized to match the compressor for efficient exhaust flow.
  • Boost Pressure: Determine the desired boost pressure to select a turbo that can achieve it without excessive lag.

For those looking to reach 700+ horsepower, specific turbo sizes are recommended:

  • 76mm Turbo: Ideal for 600-700 horsepower. Provides a good balance of power and response.
  • 80mm Turbo: Suitable for 700+ horsepower. Offers higher airflow but may introduce more lag.
  • 88mm Turbo: For extreme builds over 800 horsepower. Best for dedicated race applications.

Supporting Mods for Turbo Installation

To support the increased power from a turbo, several modifications are necessary:

  • Fuel System Upgrade: A higher capacity fuel pump and larger injectors are essential for meeting fuel demands.
  • Exhaust System: A high-flow exhaust system will help reduce back pressure and improve turbo efficiency.
  • Intercooler: An upgraded intercooler is crucial for lowering intake temperatures and preventing knock.
  • Engine Management: A standalone engine management system or a tuning solution is needed to optimize fuel and timing maps.

Performance Upgrades to Consider

In addition to the basic supporting mods, consider these performance upgrades:

  • Camshaft Upgrade: A performance camshaft can improve airflow and boost response.
  • High-Performance Pistons: Forged pistons can handle higher boost levels and improve durability.
  • Stronger Connecting Rods: Upgrading to forged rods can prevent failure under extreme conditions.
  • Better Cooling System: An upgraded radiator and oil cooler can help manage increased heat from higher performance.

Conclusion

Turbocharging a 5.7 HEMI from 500 to 700+ horsepower requires careful selection of turbo size and a range of supporting modifications. By understanding the necessary components and upgrades, enthusiasts can achieve significant performance gains while maintaining reliability.