Best Sizes of Turbos for Challenger 5.7l and 6.4l Engines: Power Gains Explained

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The Dodge Challenger has long been a favorite among muscle car enthusiasts, particularly for its powerful engine options. Among these, the 5.7L HEMI and the 6.4L HEMI engines stand out for their performance capabilities. When it comes to enhancing these engines, adding a turbocharger can result in significant power gains. This article will explore the best sizes of turbos for the Challenger 5.7L and 6.4L engines and how they can affect performance.

Understanding Turbochargers

A turbocharger is a device that forces more air into the engine’s combustion chamber, allowing for more fuel to be burned and thus increasing power output. The size of the turbocharger plays a crucial role in determining how much power can be gained and at what RPM range the power is delivered. Understanding the relationship between turbo size and engine performance is essential for optimizing your Challenger’s capabilities.

Choosing the Right Turbo Size for 5.7L HEMI

The 5.7L HEMI engine is known for its solid performance, but with the right turbocharger, it can reach new heights. When selecting a turbo for the 5.7L, consider the following:

  • Turbo Size: A turbocharger with a size between 60mm to 70mm is generally recommended for the 5.7L HEMI. This size strikes a balance between power and response.
  • Power Gains: With the right tuning, a properly sized turbo can yield power gains of 100 to 200 horsepower, depending on other modifications.
  • Boost Levels: Aim for boost levels around 6 to 10 psi for reliable performance without risking engine damage.

Several turbochargers are popular among 5.7L HEMI enthusiasts:

  • Garrett GTX2867R: Known for its quick spool and high efficiency, this turbo is an excellent choice for those looking for a balance of power and drivability.
  • Precision 6266: This turbo can support higher power levels and is suitable for more aggressive builds.

Choosing the Right Turbo Size for 6.4L HEMI

The 6.4L HEMI engine offers more displacement and power potential compared to the 5.7L. When selecting a turbo for the 6.4L, consider these factors:

  • Turbo Size: A turbocharger in the range of 70mm to 80mm is recommended for the 6.4L HEMI to maximize power output without sacrificing response.
  • Power Gains: Properly sized turbos can yield power increases of 200 to 300 horsepower, making the 6.4L a formidable contender.
  • Boost Levels: Boost levels of 10 to 15 psi are typical for the 6.4L HEMI, depending on the specific setup and fuel used.

Here are some turbo options favored by 6.4L HEMI owners:

  • Turbonetics TNX 76mm: This turbo provides excellent performance for high horsepower builds, making it a favorite among racers.
  • Comp Turbo CT4-76: Known for its reliability and power potential, this turbo is suitable for both street and track use.

Factors to Consider When Choosing a Turbo

When selecting a turbocharger for your Challenger, several factors should be taken into account:

  • Engine Build: The overall build of your engine, including internals and tuning, will affect the turbo size you can safely run.
  • Intended Use: Consider whether the car will be used for daily driving, racing, or a mix of both, as this will influence your turbo choice.
  • Supporting Mods: Ensure that you have the necessary supporting modifications, such as upgraded fuel injectors, intercoolers, and exhaust systems, to handle the increased power.

Conclusion

In conclusion, selecting the right turbocharger for your Dodge Challenger 5.7L or 6.4L HEMI engine can lead to substantial power gains and an enhanced driving experience. By understanding the optimal turbo sizes and considering factors like engine build and intended use, you can make an informed decision that best suits your performance goals. Whether you choose a smaller turbo for quick response or a larger one for maximum power, the right setup will surely elevate your Challenger’s performance to new heights.