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The HEMI engine is renowned for its power and performance, but many enthusiasts seek to unlock even more horsepower. One popular method is the HEMI MDS (Multi-Displacement System) delete. This modification can significantly enhance the engine’s output, especially when paired with a custom camshaft and high-flow exhaust system. In this article, we will explore how to achieve 550+ horsepower through these modifications.
Understanding the HEMI MDS System
The HEMI MDS is designed to improve fuel efficiency by deactivating half of the engine’s cylinders during light load conditions. While this feature can enhance fuel economy, it can also limit performance. By removing the MDS, enthusiasts can unleash the full potential of their HEMI engine.
Benefits of MDS Delete
- Improved throttle response
- Increased horsepower and torque
- Enhanced engine sound
- More consistent performance under load
Choosing the Right Custom Camshaft
A custom camshaft is crucial for maximizing horsepower. It alters the timing and lift of the engine’s valves, allowing for better airflow and combustion. When selecting a camshaft, consider the following:
- Desired horsepower goals
- Engine specifications
- Driving style and conditions
Popular camshaft options for HEMI engines include:
- Stage 1: Great for daily driving with moderate performance increase
- Stage 2: Offers a significant boost in power for spirited driving
- Stage 3: Designed for racing applications with maximum airflow potential
High-Flow Exhaust Systems
A high-flow exhaust system is essential for reducing back pressure and improving exhaust flow. This modification complements the MDS delete and custom camshaft, allowing the engine to breathe more freely. When selecting an exhaust system, consider:
- Material: Stainless steel is preferred for durability
- Diameter: Larger diameter pipes improve flow
- Design: Mandrel bends maintain smooth airflow
Popular high-flow exhaust brands include:
- MagnaFlow
- Flowmaster
- Borla
Installation Process
Installing the MDS delete, custom camshaft, and high-flow exhaust requires mechanical expertise. Here’s a general overview of the installation process:
- Disconnect the battery and remove any necessary components to access the engine.
- Remove the MDS solenoids and associated wiring.
- Install the MDS delete kit, ensuring all connections are secure.
- Replace the stock camshaft with the custom camshaft, following proper torque specifications.
- Install the high-flow exhaust system, ensuring a tight fit and proper alignment.
- Reconnect the battery and start the engine, checking for leaks or issues.
Tuning the Engine
After completing the modifications, tuning the engine is crucial to achieving optimal performance. A proper tune will adjust the air-fuel mixture and ignition timing to match the new modifications. Consider the following tuning options:
- ECU Reflash: Reprogram the engine’s computer for better performance.
- Standalone ECU: For advanced tuning capabilities and customization.
- Dyno Tuning: A professional tune on a dynamometer to achieve precise adjustments.
Expected Results
With a successful MDS delete, custom camshaft, and high-flow exhaust installation, many HEMI enthusiasts report achieving over 550 horsepower. The exact figures will depend on the specific components used and the quality of the tune. Key performance improvements include:
- Significantly increased horsepower and torque across the RPM range
- Improved throttle response and acceleration
- Enhanced engine sound and driving experience
Conclusion
The HEMI MDS delete, when combined with a custom camshaft and high-flow exhaust, can transform your engine into a powerhouse. With careful selection of components, professional installation, and proper tuning, achieving 550+ horsepower is within reach. Whether for daily driving or racing, these modifications will enhance your HEMI experience.