What year did Dodge introduce MDS?
Dodge introduced Multi-Displacement System (MDS) in the 2005 model year, starting with the 5.7-liter Hemi V8.
What MDS is and why it matters
MDS stands for Multi-Displacement System, a cylinder deactivation technology designed to boost highway fuel economy by temporarily shutting down four of the eight cylinders in V8 engines when full power isn’t needed. The system reactivates the inactive cylinders when more torque is required, aiming to deliver better efficiency without compromising driving capability.
How MDS works in practice
In operation, the engine runs on a reduced number of cylinders during steady cruising or light loads. When the driver demands more power—such as during acceleration—the system seamlessly re-engages all cylinders. The transition is engineered to be smooth, with the goal of minimizing any noticeable shift in performance.
Timeline of introduction
Below is a brief timeline outlining the rollout of MDS within Dodge and the Chrysler Group.
- 2005 model year: First deployment of MDS on the 5.7-liter Hemi V8 in Dodge/Chrysler Group vehicles, marking the public introduction of Multi-Displacement System.
- Subsequent years: The technology was gradually extended to additional Hemi-powered models across the Dodge, Jeep, and Chrysler brands as part of ongoing efficiency updates.
In short, MDS debuted with the 2005 model year and was later expanded to additional engines and vehicles within the Chrysler Group in the following years.
Impact and reception
The system aimed to deliver measurable highway fuel economy gains without diminishing everyday drivability. Over time, refinements improved smoothness and driver perception of cylinder deactivation, especially in newer model years and with updated control software.
Summary
Dodge introduced MDS in the 2005 model year on the 5.7-liter Hemi V8, with the technology subsequently expanding to other engines and vehicles within the Chrysler Group. MDS represents a concerted effort to balance power and fuel efficiency in large-displacement V8s through cylinder deactivation.
