The 5.7 Hemi engine, renowned for its power and performance, incorporates Multi-Displacement System (MDS) technology to improve fuel economy. However, many Hemi owners find the MDS system intrusive, leading to rough engine operation and a less-than-satisfying driving experience. This is where the 5.7 Hemi MDS delete kit comes in. This comprehensive guide will delve into everything you need to know about these kits, answering common questions and helping you decide if it's the right choice for your vehicle.
What is a 5.7 Hemi MDS Delete Kit?
A 5.7 Hemi MDS delete kit is a collection of parts designed to disable the Multi-Displacement System in your Chrysler, Dodge, or Ram vehicle equipped with the 5.7-liter Hemi engine. The MDS system allows the engine to run on four cylinders under light load, conserving fuel. However, this transition between four and eight cylinders can cause noticeable roughness and hesitation, often perceived as a less refined driving experience. The delete kit effectively removes this functionality, forcing the engine to always run on all eight cylinders.
Why Delete the MDS System? Common Reasons
Many drivers opt for an MDS delete for several key reasons:
- Smoother Engine Operation: The most common reason is the elimination of the jarring transitions between four and eight cylinders. A consistent eight-cylinder operation results in a much smoother and more refined driving experience.
- Improved Performance: While fuel economy might decrease slightly, many users report a perceived increase in throttle response and overall performance, especially at lower RPMs. The engine feels more responsive and powerful without the interruptions of the MDS system.
- Eliminate MDS-Related Issues: Some drivers experience issues directly related to the MDS system, such as valve lifter or camshaft problems. A delete kit can prevent further issues stemming from the constant cycling of the system.
Does a 5.7 Hemi MDS Delete Affect Fuel Economy?
Yes, deleting the MDS system will likely reduce your fuel economy. The entire purpose of MDS is to improve fuel efficiency by running on fewer cylinders during light loads. Disabling this system means the engine will always be using more fuel. However, the degree of impact varies depending on driving habits and vehicle usage. For many, the improved driving experience outweighs the minor decrease in fuel efficiency.
What are the Different Types of 5.7 Hemi MDS Delete Kits?
There are several approaches to disabling the MDS system, each with its own pros and cons:
- Plug-and-Play Modules: These are typically the easiest to install, often requiring minimal mechanical skill. They usually involve plugging a small module into the vehicle's OBD-II port to intercept and modify the signals controlling the MDS.
- Tuning and Reflashes: This approach involves reprogramming the vehicle's Engine Control Unit (ECU) to permanently disable the MDS function. This requires specialized equipment and expertise.
- Mechanical Solutions: These are less common and generally involve physically modifying parts of the engine to prevent MDS operation. This approach requires significant mechanical knowledge and expertise.
Is it Difficult to Install a 5.7 Hemi MDS Delete Kit?
The difficulty of installation depends on the type of kit chosen. Plug-and-play modules are generally the easiest to install, often requiring only basic mechanical skills. Tuning and reflashes require specialized equipment and knowledge, usually best left to professionals. Mechanical solutions are the most involved and should only be attempted by experienced mechanics.
What are the Potential Risks of Deleting the MDS System?
While many drivers successfully delete the MDS system without issue, there are potential risks to consider:
- Voiding the Warranty: Modifying your vehicle's engine control system could void your manufacturer's warranty.
- Increased Engine Wear: Constantly running on all eight cylinders could potentially increase engine wear over time, although this is debated among enthusiasts.
- Check Engine Light: Depending on the kit and installation, you might experience a check engine light due to the altered engine operation. This can often be addressed through proper tuning or specialized tools.
Conclusion
The decision to install a 5.7 Hemi MDS delete kit is a personal one. Weigh the potential benefits of a smoother driving experience and improved performance against the potential drawbacks of reduced fuel economy and potential warranty issues. Thoroughly research the different types of kits available and choose one that aligns with your mechanical skills and budget. Consider consulting with a qualified mechanic if you are unsure about the installation process or have concerns about potential risks.
