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The HEMI engine has been a popular choice among performance enthusiasts for its power and versatility. However, many owners are often faced with the decision of whether to keep the factory Multi-Displacement System (MDS) or perform a delete. This article explores the differences between the HEMI MDS delete and stock configuration, particularly focusing on the significant horsepower gains achievable with ported heads and intake modifications.
Understanding the HEMI MDS System
The Multi-Displacement System (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 may also limit performance potential. Understanding how MDS works is crucial for making informed modifications.
- Activates during low-load conditions
- Deactivates four of the eight cylinders
- Improves fuel efficiency
The Benefits of HEMI MDS Delete
Performing an MDS delete can unlock significant performance gains. By eliminating the MDS system, the engine can operate at full capacity at all times, leading to increased horsepower and torque. Here are some benefits of an MDS delete:
- Improved throttle response
- Increased horsepower and torque
- Simplified engine management
- Enhanced exhaust sound
Ported Heads and Intake: Enhancing Performance
In addition to the MDS delete, upgrading to ported heads and a performance intake can further enhance engine performance. Porting involves modifying the cylinder heads to improve airflow, while a performance intake allows for better air delivery to the engine. Together, these modifications can result in substantial horsepower gains.
Ported Heads: What to Expect
Ported heads can significantly improve the engine’s breathing capabilities. By smoothing and enlarging the intake and exhaust ports, airflow is optimized, leading to better combustion and increased power output. Here are some key points regarding ported heads:
- Increased airflow for improved combustion
- Enhanced power across the RPM range
- Better fuel efficiency under performance conditions
Performance Intake Systems
A performance intake system is designed to maximize airflow into the engine. This can include a high-flow air filter, larger diameter intake tubes, and optimized manifold designs. The benefits of upgrading to a performance intake are:
- Increased horsepower and torque
- Improved throttle response
- Enhanced engine sound
Comparing Horsepower Gains: MDS Delete vs Stock
Owners who have performed the MDS delete alongside ported heads and a performance intake have reported gains of over 50 wheel horsepower compared to stock configurations. Below is a comparison of the expected horsepower gains:
- Stock configuration: 350 wheel horsepower
- MDS delete with stock heads: 375 wheel horsepower
- MDS delete with ported heads and intake: 400+ wheel horsepower
Considerations Before Modifying Your HEMI
While the benefits of an MDS delete and performance upgrades are compelling, there are several considerations to keep in mind before making modifications:
- Potential impact on warranty
- Changes in fuel efficiency
- Need for tuning after modifications
- Possible emissions compliance issues
Conclusion
In conclusion, the HEMI MDS delete combined with ported heads and a performance intake can lead to impressive horsepower gains. For performance enthusiasts looking to maximize their engine’s potential, these modifications offer a path to achieving significant power increases while enhancing overall driving experience. As always, it is crucial to weigh the benefits against potential drawbacks and ensure that any modifications align with your goals and local regulations.