I asked Chrysler about turning MDS off, here is their reply with some useful background info:
It's great to read of your interest in the all-new 2011 Jeep Grand
The fuel-saving Multi-Displacement System (MDS) is featured on the
5.7-liter V8 engine. MDS seamlessly alternates between smooth,
high-fuel-economy four-cylinder mode when less power is needed, and V8
mode when more power is demanded. MDS optimizes fuel economy without
sacrificing vehicle performance or capability.
In general terms, here are the conditions that determine when MDS
triggers four-cylinder mode and when the engine operates on all eight
- During steady-speed city driving
- During low-acceleration cruising, even at interstate speeds
- When torque requirement is less than 95 percent of the maximum
available from four cylinders
- During acceleration
- Hauling heavy loads
- When engine is idling (for maximum smoothness)
Two cylinders on each bank are active when the engine is in
four-cylinder mode ? every other cylinder in the firing order. Switching
between four and eight-cylinder modes is made smooth by torque
compensation algorithms in the Powertrain Control Module (PCM). The
entire process takes 50-80 milliseconds ? less than the blink of an eye.
With that being said, we would not advise deactivating the
Multi-Displacement System on the 5.7L V8 engine.
Chrysler Group, LLC estimates that since its inception of MDS in 2005,
more than 100 million gallons of gasoline have been saved, along with
reduced carbon dioxide (CO2) emissions of close to one million metric
The Fuel Saver Mode message will display above the average fuel economy
in the EVIC display. This message will appear whenever MDS (if equipped)
allows the engine to operate on four cylinders, or if you are driving in
a fuel-efficient manner.
This feature allows you to monitor when you are driving in a fuel
efficient manner, and it can be used to modify driving habits in order
to increase fuel economy. There is no possible way to deactivate this
feature as well.
In regards to you concerns with the Affiliate Rewards Program, I
strongly advise contacting the Affiliate Rewards department. You may
contact them by the following:
Toll Free Number: 1-888-444-4321
Hours of Operation: 8 am to 8 pm EST, Monday through Friday
If you have any further product questions about the 2011 Jeep Grand
Cherokee models, you are always welcome to reply back to this email and
I will respond back to you as promptly as I can. If you prefer, you can
also call me directly with your questions at the Jeep Product
Information Center by calling 1-800-964-0600. When you call, I can
connect you directly to your local Jeep dealership, providing your call
is during the dealer's hours of operation.
Original Message Follows:
New Vehicle Information - Chrysler Brand Site
Confgiruing MDS on V8 5.7l 2011 Jeep Grand Cherokee
Is it possible to disable the MDS capability on the 5.7l V8 2011 Jeep
Cherokee? Is it also possible to disable ECO mode? Thanks!