The 5.7 Hemi engine, renowned for its power and performance, incorporates Multi-Displacement System (MDS) technology to improve fuel efficiency. However, many owners find the MDS system's on/off switching disruptive and prefer a smoother, more consistent power delivery. This has led to a surge in popularity of 5.7 Hemi MDS delete kits. This guide delves into everything you need to know about these kits, addressing common questions and concerns.
What is a 5.7 Hemi MDS Delete Kit?
A 5.7 Hemi MDS delete kit is a modification that disables the Multi-Displacement System (MDS) in your Chrysler, Dodge, or Ram vehicle equipped with the 5.7L Hemi engine. The MDS system allows the engine to run on four cylinders at lower loads to conserve fuel. While beneficial for fuel economy, it can lead to noticeable rough shifting, hesitation, and a less refined driving experience for some. The delete kit effectively keeps all eight cylinders active, resulting in a more consistent power delivery and smoother operation. These kits typically involve replacing or modifying components within the engine's intake system or utilizing specialized tuning software to disable MDS functionality.
How Does a 5.7 Hemi MDS Delete Kit Work?
The method employed varies depending on the specific kit. Some kits utilize mechanical modifications, such as replacing components in the intake manifold to prevent the engine from switching to four-cylinder mode. Others leverage tuning software to reprogram the engine's computer (PCM) to disable the MDS function entirely. This software-based approach often requires specialized tools and expertise. Regardless of the method, the end result is the same: the engine consistently runs on all eight cylinders.
What are the Benefits of Deleting the MDS System?
The primary benefit is a smoother, more consistent driving experience. The elimination of the four-cylinder mode eliminates the rough transitions and hesitation often associated with MDS activation. This is particularly noticeable during light acceleration or cruising. Additionally, some users report a perceived increase in low-end torque, although this is often subjective and may vary depending on other vehicle modifications.
What are the Drawbacks of Deleting the MDS System?
The most significant drawback is the decrease in fuel economy. Running all eight cylinders constantly will inevitably consume more fuel than the four-cylinder mode employed by MDS. The exact impact on fuel efficiency will vary depending on driving habits and vehicle conditions. Furthermore, some users have reported increased engine wear, though this is often debated and depends largely on driving style and maintenance.
Will deleting MDS void my warranty?
Modifying your vehicle's engine control system almost certainly voids any existing powertrain warranty. Always check your vehicle's warranty documentation before undertaking modifications like MDS deletion. Dealerships are unlikely to cover issues related to modified systems.
What are the different types of 5.7 Hemi MDS delete kits?
Several types of kits exist, ranging from simple mechanical modifications to sophisticated tuning solutions. Mechanical kits might involve swapping intake manifold components, while tuning solutions involve reprogramming your vehicle's PCM. The best type for you depends on your mechanical aptitude and comfort level with vehicle electronics.
How much does a 5.7 Hemi MDS delete kit cost?
Costs vary significantly based on the type of kit and whether you perform the installation yourself or hire a professional. Expect to spend anywhere from a few hundred dollars for simpler mechanical kits to several thousand for professional tuning solutions. Always factor in labor costs if you're not comfortable with DIY repairs.
Is it difficult to install a 5.7 Hemi MDS delete kit?
The difficulty of installation depends heavily on the chosen kit. Simpler mechanical kits may be manageable for individuals with some mechanical experience, while more complex tuning solutions often require specialized knowledge and equipment. If you lack experience, it's advisable to seek professional installation.
How does deleting MDS affect performance?
While some users report a perceived increase in low-end torque, the primary performance benefit is a smoother, more consistent power delivery. The actual increase in horsepower is usually negligible, and it's essential to temper expectations.
By understanding the benefits, drawbacks, and costs involved, you can make an informed decision about whether a 5.7 Hemi MDS delete kit is the right choice for your vehicle and driving style. Remember to always consult professional mechanics and adhere to all relevant safety guidelines during installation or modification.
