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The Dodge Charger 6.4 HEMI is a powerful platform that can be pushed to incredible horsepower levels with the right modifications. This guide will take you through the complete build process to achieve over 700 horsepower using forged internals and forced induction.
Understanding the HEMI Engine
The 6.4 HEMI engine, also known as the 392, is a robust powerplant that features a V8 configuration and a displacement of 6.4 liters. Its design allows for significant horsepower and torque, making it a popular choice among performance enthusiasts.
- Displacement: 6.4 liters
- Configuration: V8
- Stock horsepower: Approximately 485 hp
- Stock torque: Approximately 475 lb-ft
Choosing Forged Internals
To safely achieve over 700 horsepower, upgrading to forged internals is essential. Forged components can handle the increased stress and heat generated by forced induction.
- Forged Pistons: Opt for lightweight, high-strength forged pistons to reduce weight and increase durability.
- Forged Connecting Rods: Choose rods that can withstand high RPMs and increased power levels.
- Forged Crankshaft: A forged crankshaft is crucial for reliability under extreme conditions.
Forced Induction Options
When it comes to forced induction, you have two primary options: superchargers and turbochargers. Each has its advantages and disadvantages.
- Supercharger: Provides instant power and is easier to install. It draws power from the engine, which can affect fuel efficiency.
- Turbocharger: Offers higher power potential and better fuel efficiency but introduces turbo lag.
Supporting Modifications
In addition to forged internals and forced induction, several supporting modifications are necessary to ensure your build runs smoothly and reliably.
- Fuel System Upgrade: Install larger fuel injectors and a high-flow fuel pump to support increased fuel demands.
- Exhaust System: Upgrade to a high-performance exhaust system to improve airflow and reduce back pressure.
- Cooling System: Consider a larger intercooler or upgraded radiator to manage increased heat.
- Tuning: A proper tune is essential to maximize performance and ensure engine safety.
Installation Process
The installation process for your build can be complex. It is recommended to have a skilled mechanic or performance shop handle the installation, especially for forced induction systems.
- Disassemble the Engine: Carefully remove the engine and disassemble it to replace the internals.
- Install Forged Internals: Replace stock components with forged parts, ensuring proper clearances and tolerances.
- Install Forced Induction System: Follow manufacturer instructions for proper installation of the supercharger or turbocharger.
- Reassemble and Tune: Reassemble the engine and perform a custom tune to optimize performance.
Testing and Tuning
Once your build is complete, it is crucial to conduct thorough testing. This includes dyno testing to measure horsepower and torque, as well as street testing to assess drivability.
- Dyno Testing: Use a dynamometer to measure the engine’s output and ensure it meets your performance goals.
- Street Testing: Take the car for a test drive to evaluate performance under real-world conditions.
- Adjust Tuning: Make any necessary adjustments to the tune based on testing results.
Conclusion
Building a 700+ horsepower Dodge Charger 6.4 HEMI with forged internals and forced induction is a rewarding project that requires careful planning and execution. With the right components and modifications, you can achieve incredible performance while maintaining reliability.