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The HEMI engine has long been a favorite among automotive enthusiasts, known for its power and performance. Building a 700+ horsepower HEMI with a Multi-Displacement System (MDS) delete is an exciting project that can yield impressive results. In this article, we will explore the top supporting mods and upgrades necessary to achieve this goal.
Understanding the HEMI Engine
The HEMI engine, with its distinctive hemispherical combustion chambers, is engineered for high performance. This design allows for better airflow and combustion efficiency, making it an ideal candidate for high horsepower builds. However, to reach the 700+ HP mark, certain modifications are essential.
MDS Delete: Why It Matters
The Multi-Displacement System (MDS) is designed to improve fuel efficiency by deactivating half of the engine’s cylinders under light load conditions. While this feature is beneficial for everyday driving, it can be a hindrance in high-performance applications. Removing the MDS allows the engine to operate on all cylinders at all times, which is crucial for maximizing horsepower.
Top Supporting Mods and Upgrades
- Cold Air Intake: A high-performance cold air intake system increases airflow to the engine, enhancing performance and throttle response.
- High-Performance Exhaust System: Upgrading to a less restrictive exhaust system improves exhaust flow, which is vital for maximizing horsepower.
- ECU Tuning: Custom tuning of the engine control unit (ECU) is essential for optimizing performance after modifications.
- High-Performance Camshaft: A performance camshaft can significantly increase horsepower by altering the timing and lift of the engine’s valves.
- Upgraded Fuel Injectors: Higher-flow fuel injectors ensure that the engine receives adequate fuel to support increased horsepower.
- Forged Internals: Upgrading to forged pistons and connecting rods can provide the strength needed to handle the increased power levels.
- High-Performance Radiator: An upgraded radiator helps manage engine temperatures, especially under increased load.
- Supercharger or Turbocharger: Forced induction systems can significantly boost horsepower, making them a popular choice for high-performance builds.
Detailed Breakdown of Key Mods
Cold Air Intake
A cold air intake system replaces the factory air intake, allowing for cooler, denser air to enter the engine. This upgrade not only improves horsepower but also enhances throttle response. Popular options include brands like K&N and AFE Power.
High-Performance Exhaust System
An aftermarket exhaust system reduces back pressure and improves exhaust flow. Look for systems with mandrel bends and larger diameter piping to maximize performance. Brands such as Borla and MagnaFlow are well-regarded in the industry.
ECU Tuning
After installing performance mods, it’s crucial to tune the ECU to ensure the engine runs efficiently. A custom tune can optimize fuel maps and ignition timing, unlocking the full potential of your upgrades. Consider using a reputable tuner or software like HP Tuners.
High-Performance Camshaft
A performance camshaft changes the engine’s valve timing and lift characteristics, allowing for better airflow at high RPMs. This mod can significantly increase horsepower and torque. Brands like Comp Cams and HEMI Performance offer quality options.
Upgraded Fuel Injectors
To support increased power, high-flow fuel injectors are necessary. They ensure that the engine receives enough fuel, especially when under boost or high load conditions. Look for injectors that are compatible with your specific engine setup.
Forged Internals
When building a high horsepower engine, upgrading to forged pistons and connecting rods is essential for durability. These components can withstand the increased stress and heat generated by higher power levels. Brands like Wiseco and Eagle Specialty Products are popular choices.
High-Performance Radiator
A high-performance radiator is crucial for maintaining optimal engine temperatures, especially during spirited driving or track use. Upgrading to a larger capacity radiator can prevent overheating and ensure reliable performance.
Supercharger or Turbocharger
Adding a supercharger or turbocharger can dramatically increase horsepower by forcing more air into the engine. These systems can be complex, requiring careful installation and tuning, but they offer some of the most significant gains in power. Consider options from companies like Whipple or Procharger.
Final Thoughts
Building a 700+ HP HEMI with MDS delete is an ambitious but rewarding project. By carefully selecting and installing the right supporting mods and upgrades, you can unlock the full potential of your engine. Always remember to balance performance with reliability, and consult with professionals when necessary to achieve the best results.