The Multi-Displacement System (MDS) in your Ram 1500 Hemi engine helps conserve fuel by deactivating cylinders when full power isn’t needed. However, sometimes you might want to disable MDS for maximum performance. This guide provides a quick overview of how to temporarily disable MDS in your Ram 1500.
Understanding MDS in Your Ram 1500
MDS improves fuel economy by shutting off four of the eight cylinders in your Hemi engine when cruising or under light load. It does this by deactivating fuel injectors and closing intake and exhaust valves using solenoids. While beneficial for fuel efficiency, MDS can sometimes cause slight hesitation or a noticeable change in engine sound.
Why Disable MDS Ram 1500?
Temporarily disabling MDS allows you to access the full power of your Hemi engine. This can be beneficial for towing, hauling heavy loads, or when you need quick acceleration. Disabling MDS provides maximum horsepower and torque on demand.
Temporary Disable MDS Ram 1500: Step-by-Step
The method for temporarily disabling MDS depends on your Ram 1500’s transmission and shifter type:
1. Center Console Shifter (6-Speed Transmission):
- Put the shifter into manual mode by pulling it all the way down and to the driver’s side.
- Repeatedly pull the shifter towards the driver’s side and release six times. The number “6” should appear on the dashboard display.
2. Rotary Knob Shifter (8-Speed Transmission):
- Press the “Down” button on the steering wheel to engage manual mode.
- Press the “Up” button repeatedly until the display indicates the highest gear available (usually 8).
3. Column Shifter (Steering Column):
- With the vehicle in “Drive,” press the “Down” button on the shifter to engage manual mode.
- Press the “Up” button repeatedly until the display shows the highest gear.
Once you’ve followed the steps for your specific shifter, the MDS should be temporarily disabled. You’ll notice the engine running on all eight cylinders, providing full power.
MDS vs. Eco-Light: Understanding the Difference
While the MDS and Eco-Light might seem connected since they often activate simultaneously, they are separate systems. The Eco-Light simply indicates when you’re driving in a fuel-efficient manner, while MDS actively controls cylinder deactivation.
Conclusion
Temporarily disabling MDS in your Ram 1500 is a simple process that allows you to access full engine power when needed. Remember that this is a temporary disable, and MDS will reactivate the next time you start your vehicle. For a permanent solution, consider a tuner designed for this purpose. Consult your owner’s manual for specific instructions related to your Ram 1500 model year.
