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  #1  
Old 01-16-2012, 07:59 PM
micar71 micar71 is offline
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Question Mds

"MDS". What is it?
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Old 01-16-2012, 08:06 PM
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"Multi Displacement System (MDS)" or cylinder deactivation turns off the fuel in four cylinders when power is not needed.
This system triumphs because of modern electronic controls and electronic throttle control. The HEMI can transition from eight cylinders to four in 0.04 seconds. The system works by cutting out the valve lifters, keeping the valves in four cylinders closed; energy is not lost by pumping air through them.

Info was gathered from allpar.com Hope this helps!
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Last edited by moparornocar72; 01-16-2012 at 08:09 PM.
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Old 01-16-2012, 08:11 PM
micar71 micar71 is offline
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Ooooooooohhhh.... That would be the "5.7 liter" thing. Lol. Okay, thanks.
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Old 01-16-2012, 08:17 PM
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anytime man! Hope that explained everything!
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Old 01-16-2012, 08:25 PM
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Thanks. Just checked out your link. Nice
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Old 01-16-2012, 09:00 PM
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turned mine off and i get better mielage in town and same on high way but better throttle response
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Old 01-16-2012, 09:54 PM
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How did you turn it off?
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Old 01-17-2012, 09:38 AM
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it can't be turned off and no, you aren't getting better mileage without MDS. That's nonsense.
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Old 01-17-2012, 11:18 AM
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When I am cruising along, the engine changes pitch, sounds like it is dropping out of overdrive, and then going back into overdrive. Or perhaps the MDS is kicking all eight cylindersw in and dropping them out again. Any ideas or suggestions would be appreciated.
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Old 01-17-2012, 11:21 AM
dkerr24 dkerr24 is offline
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Actually, you can temporarily defeat MDS... well documented on this site.

Just flick your transmission into '5', and the MDS will stop. I usually keep mine off while beginning my drive, and when on residential streets.

However, as soon as you shift into any other gear, that resets it back to 'on'.

Darin
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