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  #13  
Old 01-06-2011, 10:45 AM
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Re: MPH with MDS on WK2?

There has been discussed many times. ECO does not only mean 4 cylinder mode activation. It also can mean you are driving in an efficient manner, but not running on 4 cylinders.

ECO Mode Engagement

What does "ECO" mean on EVIC with V6?
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Old 01-06-2011, 01:23 PM
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Re: MPH with MDS on WK2?

I think people are getting confused because of the different meanings of the "ECO" indicator based on engine type:

V6: ECO works like the old vacuum-driven economy gauges. It will turn on during steady-throttle conditions while the RPMS are in the range indicated by the blue (green) line on the tach.

V8: ECO means MDS engaged. Period.

I've driven both V6 and V8 versions of this truck from Chicago to Pittsburgh and back, so I speak from experience.

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  #15  
Old 01-06-2011, 01:37 PM
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Re: MPH with MDS on WK2?

I can hear/feel MDS activating on my wk2, and it always sets the ECO indicator on the EVIC when it does so. Heck, it's still thirsty when running on 4 cyl, but it does make burning old dinosaurs feel pretty good when your foot goes down.
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Old 01-07-2011, 08:35 AM
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Re: MPH with MDS on WK2?

Quote:
Originally Posted by webspoke View Post
I can hear/feel MDS activating on my wk2, and it always sets the ECO indicator on the EVIC when it does so. Heck, it's still thirsty when running on 4 cyl, but it does make burning old dinosaurs feel pretty good when your foot goes down.
It's not surprising the ECO indicator comes on when MDS is engaged. However, the question in my mind is whether MDS is on whenever the ECO indicator is on.

I've had the ECO indicator come on at speeds well in excess of 75MPH and I have a hard time believing MDS activates at such speeds.

Milous or any of the other guys at Jeep, can you clarify this? The manual is unclear on this.

EDIT: The first link in post 13 had this from Jeep:

Quote:
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.
So, just because the ECO indicator is on doesn't mean MDS is activated. That's what I figured. It appears there is no foolproof way to know if MDS is activated.
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Old 01-07-2011, 09:28 AM
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Re: MPH with MDS on WK2?

Jim,

You can definitely hear the change in engine tone.
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Old 01-07-2011, 11:08 AM
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Re: MPH with MDS on WK2?

My set speed to and from work is 90 MPH and "ECO" is displayed most of the time.
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  #19  
Old 01-07-2011, 01:37 PM
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Re: MPH with MDS on WK2?

Here is a quote from Chrysler re: MDS taken from another thread.


"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."


For me, this statement confirms that ECO does not always mean MDS is activated.
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Old 01-07-2011, 01:44 PM
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Re: MPH with MDS on WK2?

I've got 3k miles on my v8, and so far my experience hasn't supported your conclusion, Red.

My theory is that the statement you're latching onto is redundant. And that is because any time you're driving in a fuel efficient manner - i.e. steady throttle, low torque demands, you are ALSO meeting the conditions to enable MDS.
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Old 01-07-2011, 03:05 PM
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Re: MPH with MDS on WK2?

Quote:
Originally Posted by bpmcgee View Post
I've got 3k miles on my v8, and so far my experience hasn't supported your conclusion, Red.

My theory is that the statement you're latching onto is redundant. And that is because any time you're driving in a fuel efficient manner - i.e. steady throttle, low torque demands, you are ALSO meeting the conditions to enable MDS.
I agree with you. When you read it all, the MDS works at any speed as long as minimal or no torque is required.
I will now accept that ECO on V8s = MDS activated.
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Old 01-10-2011, 09:21 PM
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Re: MPH with MDS on WK2?

I've looked all over for a definitive answer to this. At the following link (have to click "more" under "Best in Class Driving Range") it says that MDS operates between 40 and 60. I've heard that was the case with older 5.7's but hear conflicting reports from owners of the WK2. Even though it says this on the Jeep website, I still don't know whether to believe it or not.

http://www.jeep.com/en/2011/grand_ch...iews/overview/
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Old 01-10-2011, 09:49 PM
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Re: MPH with MDS on WK2?

You should be able to feel the activation and deactivation. Yes in actuality ECO will mean 4 cylinder operation. ECO can also be lit when not in V4 mode. It is very evident when you feel it enter V4 mode then just barely give it gas enough to kick it out. I can hold the ECO light and be running on all 8 cylinders.
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Old 01-10-2011, 11:25 PM
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Re: MPH with MDS on WK2?

Quote:
Originally Posted by swampass2 View Post
I've looked all over for a definitive answer to this. At the following link (have to click "more" under "Best in Class Driving Range") it says that MDS operates between 40 and 60. I've heard that was the case with older 5.7's but hear conflicting reports from owners of the WK2. Even though it says this on the Jeep website, I still don't know whether to believe it or not.

http://www.jeep.com/en/2011/grand_ch...iews/overview/

It definitely activates above 60.
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