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  #11  
Old 10-22-2013, 10:12 AM
CharlieL CharlieL is offline
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Originally Posted by Jackdashack View Post
Thanks a boatload there Explorer Rob!
Yes, thanks for the clarification. Previously I wrote "the "ECO" setting is found through the UConnect settings. The setting is an on/off "Fuel Saver Display in Cluster." See page 297 of the owners manual." What I should have said was that it's the "ECO" displayed in the instrument panel that is turned on/off through the UConnect. I didn't intend to imply that the MDS system can be turned on/off through the UConnect.
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  #12  
Old 10-22-2013, 11:59 AM
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Originally Posted by CharlieL View Post
Yes, thanks for the clarification. Previously I wrote "the "ECO" setting is found through the UConnect settings. The setting is an on/off "Fuel Saver Display in Cluster." See page 297 of the owners manual." What I should have said was that it's the "ECO" displayed in the instrument panel that is turned on/off through the UConnect. I didn't intend to imply that the MDS system can be turned on/off through the UConnect.
Takes a RAMTUFF MAN to correct himself CharlieL !!
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  #13  
Old 10-22-2013, 12:49 PM
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Chunkem Chunkem is offline
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Originally Posted by Asur View Post
The ECO indicator is not an indicator for whether the MDS is on or not, its just an indicator that tells you when your engine is running at its optimal performance level.

ECO indicator has nothing to do with MDS, MDS is triggered by different variables, you can disable MDS and still get the ECO light to trigger on, like the 4.7L engine, no MDS, it has only the fancy vacuum sensor that turns the light in the dash on when it senses the engine is not forcing and at that point burning its fuel optimally.

From the Manual
"ECO / ECO-ON (Fuel Saver Indicator) — If Equipped
The ECO-ON indicator will illuminate when you are
driving in a fuel efficient manner and can be used to
modify driving habits in order to increase fuel economy.
The ECO display will toggle between ECO and ECO-ON
depending on driving habits and vehicle usage. Press the
Odometer / Trip Odometer / ECO (Fuel Saver Indicator)
button to change the display from odometer to either of
the two trip odometer settings or the “ECO” display"

You can turn this option on or off in EVIC
Hey thanks ASUR.....I thought it meant that it went to 4 cyclinders.....Thanks and great to know....I only thought this because my dealer informed thats what it meant however now I know the real reason....LOL
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  #14  
Old 10-22-2013, 01:55 PM
Ramzaq Ramzaq is offline
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Originally Posted by battlerattle View Post
All 1500 Hemis have MDS........my 2500 does not.
Only the 1500 Hemi's have MDS and the 2500 and up Hemi's do not. The new 6.4 Hemi will have MDS in the upper series models.
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  #15  
Old 10-22-2013, 03:05 PM
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Jackdashack Jackdashack is offline
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Originally Posted by Ramzaq View Post
Only the 1500 Hemi's have MDS and the 2500 and up Hemi's do not. The new 6.4 Hemi will have MDS in the upper series models.
Ramzaq: I'm sure that's good info others here and thanks.

SO TO WRAP IT?

1) THE ECO LIGHT on the EVIC (seen thru the steering) is only a "feel good" light that tells when you are driving for the best possible MPG ( it is turned on in the Uconnect, I did it today and it's there, and was on when I'm pussyfooting it. I have a late 2013 so the ECO light is back or there ) I have to admit on my budget ... that's a lot of the time. I had a Pontiac Sunfire 2000 before this. You can imagine the gas diff. It was not a shock, I had to incorporate that in to the equation ... but still 25/26 on the RAM is not bad up the road. But I live in a small town and a lot of my driving is around town. That's what kills my mpg.

2) THE MDS is an engine operation in all 1500's that cuts out 4 cylinders in the 8cylinder when you're up to speed and easy riding ... coasting ... riding ... etc. The engine determines it. We don't. There is no indicator that it has done it, it just does it. Is this right? I guess generally speaking if you are going 60 and the ECO light is on and you have the option in the EVIC like mine does of real time MPG and your getting 25/26mpg ... one would assume it's running on 4 cyl ... not 8 cyl.

Ya'll been great ... thanks. Jack ":-D

Last edited by Jackdashack; 10-22-2013 at 03:13 PM.
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  #16  
Old 10-22-2013, 03:50 PM
Asur Asur is offline
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Originally Posted by Jackdashack View Post
I guess generally speaking if you are going 60 and the ECO light is on and you have the option in the EVIC like mine does of real time MPG and your getting 25/26mpg ... one would assume it's running on 4 cyl ... not 8 cyl
Not necessarily, but 95% of the time if your feathering the gas and the ECO light is on the MDS will kick in. Here is a simplistic view of how and when MDS will kick in, also remember that this may be different for other vehicles, due to the weight of the occupents, the road the temperature, humidity etc. All these things will affect how MDS will chime in,

- MDS will activate at as little as 18 mph, but you really have to pussyfoot the throttle for it engage. It will activate when off the throttle, as long as rpms remain above about 1100 or 1200rpm. If your coasting as the truck slows down the MDS will activate until the rpms pass below around 1200rpm, then you're back on all 8 cylinders. MDS will activate whenever the load permits, and above about 1200 rpm. MDS will function at pretty well any speed above 10-20mph and there is no set limit at which MDS will function, but you have to factor in the load on the engine so with a super strong back wind it might very well activate at 100 mph, (I said Strong Back wind like your running away from a hurricane).

Some have reported MDS will activate only at specific speeds, seems it will activate a lot at speeds of 25-35 mph, but once the transmission shifts into 4th gear (around 35 mph), it won't activate again until a little above 40 mph. MDS will then be very active in the 45-65 mph range. As speed increases above 65 mph MDS will rarely activate due to the aerodynamic drag which in turn will place a greater load on the engine. it can activate at speeds higher than 65, but you won't see it activate a lot at those speeds unless you've got a tailwind or are heading slightly downhill.

During all the time that MDS will Activate and de-activate, the ECO light will also turn on and off to distract you as you drive down the road but is not an indicator that MDS is on or off.
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  #17  
Old 10-22-2013, 04:08 PM
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Jackdashack Jackdashack is offline
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Originally Posted by Asur View Post
Not necessarily, but 95% of the time.
Okay ... getting 2 B overload here. I did read your info twice and I understand. But no need to commit it to memory as you have apparently and done well. I'll just let the truck do it's thing. It seems to do it well and I'll just enjoy it. At least I know the difference between ECO, how to turn "the LIGHT" on and that the truck does the MDS thing when it needs to.

Thanks! All good pro and tech stuff here. ":-D
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  #18  
Old 10-22-2013, 05:15 PM
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Silvercreek Silvercreek is offline
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If your truck is averaging 25/25mpg you most likely not driving a 5.7 Hemi.
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  #19  
Old 10-22-2013, 05:42 PM
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Jackdashack Jackdashack is offline
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Originally Posted by Silvercreek View Post
If your truck is averaging 25/25mpg you most likely not driving a 5.7 Hemi.
Mr.Silver: Didn't I qualify that as 25/26 hwy mpg? I not, I apologize, there's no averaging 25mpg in all driving. But it's not near that around town, but if the truck's own factory equipment is to be believed it's getting 25/26 hwy. And the emblem that says 5.7 HEMI and BIG HORN emblem. Isn't that what 2013 RAM is advertising anyway? This EVIC has a number of options to scroll through. One comes up looking similar to a speedometer, but shows live second by second your mpg as the throttle is pressed/depressed. If I do a lot of hwy on a trip it's been averaging about 20mpg. Of course there's only about 550 miles on the truck. If there is a lot of town driving in that trip, then it's significantly lower.

Sorry if I was not clear. The only other thing I know to do is take a cell photo but I believe I've answered the question. ":-D

Last edited by Jackdashack; 10-22-2013 at 05:53 PM.
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  #20  
Old 10-22-2013, 09:40 PM
Ramzaq Ramzaq is offline
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Quote:
Originally Posted by Silvercreek View Post
If your truck is averaging 25/25mpg you most likely not driving a 5.7 Hemi.
It is not impossible for a Hemi to reach a reading of 25 mpg while traveling at highway speeds. With my '09 4x4 I can average right at 20 while doing 70 mph and it will hit 21 if it is just around 63 mph. Conditions have to be right, no wind and basically flat, (easy in CA) and keeping it in "Fuel Saver" (Eco) mode.

I have seen my friends '13, 4wd Hemi, 8 speed reach 25 highway so it is not impossible. Thing is it had 2k miles so it may even get a little better as it breaks in. Much of this is about driving style also it also has 3.21 rear. These are hand calculations.

Last edited by Ramzaq; 10-22-2013 at 10:01 PM.
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