The 5.7 Hemi engine, known for its power and performance, incorporates Multi-Displacement System (MDS) technology to improve fuel economy. However, many drivers find the MDS system intrusive, leading to a rough idle and inconsistent power delivery. This guide delves into 5.7 Hemi MDS delete kits, exploring their benefits, drawbacks, potential issues, and installation considerations.
What is a 5.7 Hemi MDS Delete Kit?
A 5.7 Hemi MDS delete kit is a collection of components designed to disable the Multi-Displacement System in your Chrysler, Dodge, or Jeep vehicle equipped with the 5.7-liter Hemi engine. The kit typically involves replacing or modifying parts of the engine's intake system, preventing the engine from switching between four and eight cylinders. This results in the engine consistently running on all eight cylinders.
Why Delete the MDS System?
Many drivers opt for an MDS delete for several reasons:
- Smoother Idle: MDS can cause a noticeable rough idle, especially when the engine switches between four and eight cylinders. A delete kit eliminates this roughness.
- Improved Throttle Response: The transition between four and eight cylinders can sometimes lead to a lag in throttle response. Disabling MDS provides a more immediate and responsive acceleration.
- Enhanced Performance (Subjective): While not always significant, some users report a perceived improvement in overall performance and power delivery after disabling MDS.
- Elimination of MDS-Related Issues: Some drivers experience issues like lifter noise or other problems associated with the MDS system, and a delete kit resolves these concerns.
What are the Drawbacks of an MDS Delete?
While the benefits are appealing, it's crucial to acknowledge the potential drawbacks:
- Reduced Fuel Economy: The primary purpose of MDS is to improve fuel efficiency. Disabling it will likely lead to a decrease in gas mileage.
- Increased Engine Wear (Potential): Some argue that constantly running on all eight cylinders could potentially increase engine wear over time, although this remains a point of debate among automotive enthusiasts.
- Voiding Warranty (Possible): Modifying your vehicle's engine control system could potentially void your manufacturer's warranty. Check your warranty terms carefully before proceeding.
How Does a 5.7 Hemi MDS Delete Kit Work?
MDS delete kits typically work by one of the following methods:
- PCM Flashing: This involves reprogramming the Powertrain Control Module (PCM) to disable MDS functionality. This often requires specialized software and expertise.
- Mechanical Kits: These kits typically involve installing components that physically prevent the engine from switching between four and eight cylinders. This could involve modifying or replacing solenoids or other parts.
What are the Common Components in a 5.7 Hemi MDS Delete Kit?
The exact components vary depending on the kit and method used, but common elements might include:
- Solenoids: These control the switching between four and eight cylinders, and they are often modified or replaced in mechanical kits.
- Wiring Harness: This might require modification or replacement depending on the chosen method.
Is it Difficult to Install a 5.7 Hemi MDS Delete Kit?
The difficulty of installation varies greatly depending on the type of kit (mechanical or PCM flash) and your mechanical aptitude. PCM flashing requires specialized tools and knowledge, while mechanical kits may be more accessible to DIY enthusiasts but still require a degree of mechanical skill and understanding.
What are the potential issues after installing a 5.7 Hemi MDS delete kit?
Potential issues can range from simple problems like error codes that need to be cleared to more complex engine concerns. Thorough research, selecting a reputable kit, and following installation instructions carefully are crucial to minimizing these risks.
Can I install a 5.7 Hemi MDS delete kit myself?
While some mechanical kits are potentially DIY-friendly, installing a PCM flash requires professional-level expertise. Improper installation can damage your vehicle's engine control system, leading to serious issues.
Where can I find a reputable 5.7 Hemi MDS delete kit?
Reputable vendors specializing in performance parts for Chrysler, Dodge, and Jeep vehicles are the best place to source a high-quality kit. Thorough research and reading customer reviews are essential before making a purchase.
This comprehensive guide provides a detailed overview of 5.7 Hemi MDS delete kits. Remember to always prioritize safety and consult with a qualified mechanic if you are unsure about any aspect of the installation process. This information is for educational purposes and does not constitute professional automotive advice.
