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MDS Multi Displacement System Discussion


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  #1  
Old 02-11-2015, 08:59 PM
streetHEMI streetHEMI is offline
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Default got some questions about mds..

well i got to thinking if the hemi is 345ci in v8 mode what is it in mds mode?
plus what cylinders does it cut off?

thank yall.
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Old 02-11-2015, 09:06 PM
mikz86ta mikz86ta is offline
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Default

1st = half.
2nd =.Wikipedia
lol
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Old 02-11-2015, 09:33 PM
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Default

It turns off one piston per crank journal and its half of 345 in MDS but less than half power due to pumping losses. Also if you are on the highway for a few hours and you get off the other 4 cylinders reactivating will have some ring-land blow-by.
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Old 02-11-2015, 09:55 PM
streetHEMI streetHEMI is offline
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on the first half of my question i dont know why i didnt think of that, trying to make it more complex then it really is.

i have found out i enjoy the mds system, due to small town life straight road 30mph with very little traffic, not sure what you mean by ring-land blow-by.

the roads i travel the mds kicks on and off about 80% of the time.
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Old 02-11-2015, 10:16 PM
streetHEMI streetHEMI is offline
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also i am still lost on this mds after reading the explain mds thread
i here people say that eco light isnt mds it shows up next to the compass on the evic.
and there is a fuel saver light that shows when its mds. which i dont have or see.. or is what i said the mds light?
then i head people say eco mode is mds...


"Fuel Saver Mode
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."


AS OPPOSED TO:

"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."

found out people with factory dual tips can notice it. mine is single exit system so i cant hear it.

i was reading the why does everyone hate mds, and gained some info.. but this is my first hemi, had a 89 ram w150 with the 318 it was a dog (3speed auto) had a 96 ram 2500 5.9 diesel auto was a nice truck but needed work. 14 cruze with the 1.8L it wasnt worth keeping..

but as long as i can get what my last ram got, which was 21mpg avg mostly highway.. i am happy with her.
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Last edited by streetHEMI; 02-11-2015 at 10:55 PM.
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  #6  
Old 02-12-2015, 11:52 PM
streetHEMI streetHEMI is offline
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Default

well update on the mds.. i found out by hear and feel vs the eco light this time. when mds is active its manly at 40mph see i never noticed it before due to i live in a small town, max speed 30mph and its flat.. i happen to notice it because 1. radio was low, 2. i was going up a slight grade eco light on. normally i keep the radio up so hard to feel or notice the little things.

glad i am not getting a muffler (she has what i like) quiet cant be heard when outside or crusing., wake the hemi up (3k plus rpm) she sounds nice and will be heard. also saw people hated the mds with exhaust.
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Last edited by streetHEMI; 02-13-2015 at 01:33 AM.
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