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  #13  
Old 12-01-2010, 10:16 AM
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Re: ECO Mode Engagement

Quote:
Originally Posted by ryorde View Post
My MDS is perfect. I dont know if it is saving any gas, but I cant tell when is comes on and off.
X2^^^^. That also goes for my '09 charger daytona. I never feel it unless I try really hard, mostly when using cruise on the interstate and start up a hill I will feel a little bump but thats all.
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  #14  
Old 12-01-2010, 06:02 PM
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Re: ECO Mode Engagement

People that are experiencing MDS "vibrations" or other issues need to have it checked and it may be related to the shutter in some way. My jeep is 100% smooth in MDS only difference is occasionally a little hesitation when I give it some gas and it has to switch back to all 8 cylinders. There is absolutely nothing that should cause the engine to be less smooth or to vibrate simply because of switching to four cylinders, unless: poor quality gas, some sort of spark, ignition or timing issue, or somehow related to the shutter problem.

I have driven a bunch of limited 5.7 prior to my purchase since this was my first jeep with the MDS and I wanted to see how it changed the driving experience. I did not experience any of that on the 7 jeeps I drove and not on mine either. I did a search and on older models it does appear to be a somewhat common occurrence but should have been fixed according to most.

I would like to know under what driving conditions this is happening. Outside temp, is the engine completely warm, driving under a load, going uphill, what octane fuel is being used and how many miles on the vehicle. And also have you had the oil changed since purchase. The reason I ask this is if 5w-20 was not used then there could be some issues including vibration.

As far as the fuel savings I get around 16-18 on the highway with tow/haul on (MDS turned off) compared to a pretty consistent 21 with it on and that is doing my usual 75 mph. So it can be fairly significant savings.
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Old 12-01-2010, 11:32 PM
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Re: ECO Mode Engagement

I don't notice it when running 89 octane gas. I haven't tried any other grades yet.
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Old 12-02-2010, 01:47 PM
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Re: ECO Mode Engagement

On my '07 Overland the shutter is a combination of the MDS and the torque converter engagement. I shift to "5" around which caused the TC to not engage. There is a TSB for WK that delays the TC engagement to 23 MPH Vs about 16. made a small improvement.
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Old 12-03-2010, 06:09 PM
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Re: ECO Mode Engagement

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
Cherokee!

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
cylinders:

FOUR-CYLINDER MODE:
- 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

EIGHT-CYLINDER MODE:
- 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
tons.

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

Website: http://www.chrysleraffiliates.com

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
Brief Description:
Confgiruing MDS on V8 5.7l 2011 Jeep Grand Cherokee
Comments:
Is it possible to disable the MDS capability on the 5.7l V8 2011 Jeep
Grand
Cherokee? Is it also possible to disable ECO mode? Thanks!
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