MDS

[Trooper2]

Wondering how many of you leave the MDS on, turn it off, or programmed it to stay off. I don't think it saves that much fuel and only adds to the wear and tear of the engine overall.

 

[Ram Night]

Wondering how many of you leave the MDS on, turn it off, or programmed it to stay off. I don't think it saves that much fuel and only adds to the wear and tear of the engine overall.

I have never liked it at all and have never noticed any fuel mileage gain the crappy way the engine runs at slow speed. I purchased a tuner to turn it off on my 07 Ram and 13 Challenger. Buy on my 17 Sport, I do not want to spend $1000 for a new PCM and Tuner, so I push the speed selector to select 8+ and call it good.
But when they come up with a custom tune that also includes the 8 speed transmission, I might look into a intune tuner then. And I have read about the MDS lifters failing due to failing internal parts so this is another reason to disable it.

 

[huntergreen]

Lifter failures happen on non MDS cylinders as often as the MDS cylinders.

 

[69GWC]

I trun mine off everytime I drive.
its worthless and only there for cafe standards.
In perfect conditions it helps but not much in the real world.

 

[JSVT3]

I never payed it much attention, but with a new exhaust it drives me nuts. So I disable it every time I drive.

 

[Ramm5.7]

I turn it off asap. Engine sounds like crap to me with it on. If im on a long stretch of freeway cruising I sometimes engage it but not very often. Where im at my long stretchs are at best an hour drive, so not worth whatever gains might be

 

[MADDOG]

I turned mine of on the 2014 6.4L truck. Had Hemifever include MDS/Off in my custom tune.

 

[Mustangmike66]

I leave mine on and have had no problems through 39k miles.


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[tones2SS]

I never payed it much attention, but with a new exhaust it drives me nuts. So I disable it every time I drive.

I don't disable it all the time, but I do disable it. I too have an aftermarket exhaust and it drives me freaking nuts.
I honestly wouldn't mind if the MDS was never on the truck to begin with.

 

[kiloRAM]

Mine comes on so infrequently, I'm not sure it is even worth pushing the gear selector to turn it off. I'd probably wear out the button and only save a couple minutes a week running MDS. I'm curious what the point was putting it on my truck. It mostly only comes on going down hill, and it seems like I am always going up hill (both ways in the snow - even in summer). I wish MDS was not so sensitive.

 

[Curly5759]

So...I just looked at my owners manual. It says no driver input required or available. Other than a tuner, how do you turn it off?

 

[Ratket]

I only turn mine off when running 55 or slower, anything other than that and I let it ride, it does help my 6.4 as that ****** is thirsty.

 

[Ratket]

So...I just looked at my owners manual. It says no driver input required or available. Other than a tuner, how do you turn it off?

Either by “ Tow Haul “ button or “gear selector” and locking out in certain gears.
I trigger tow haul to disable it and to keep my truck from going into 6th at 45 mph.

 

[Kap1]

I never notice it, and it probably does help a little bit to save fuel.

 

[KansasArt]

I turn mine off every time via the gear select method. Put it in 5 for in town & 7 for highway. 8 for extended highway time. 5th allows it to stay around 2K rpm give or take. What's the sense of having a decent engine if the tranny is just gonna stay in high gears to keep your rpms low?


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[rotwiler]

So...I just looked at my owners manual. It says no driver input required or available. Other than a tuner, how do you turn it off?

On center console shifter I put mine in 6th and shuts it off. On dash mount shifter, I don't think you can.

 

[Wahrsuul]

Not sure when MDS kicks on. I have the "Fuel Saver" indicator, and I try to keep it on as much as possible. Is that when MDS is on? Don't know for sure, I've gotten conflicting reports. I never try to turn it off except when towing. I've been running a PC in Eco mode for the last couple tanks to see if that helps mpg.

 

[West27]

I did some experiments the other week with having it on and off driving to work (10 miles each way with not a lot of stops) and found my gas mileage was around 1.6mpg better with it on. I think it depends your drive if it is worth leaving it on or not. If I do a lot of stop and go driving I turn it off but if I’m doing highway I leave it on.

 

[West27]

Also gained around .5mpg with mds on and the clutch fan removed. I will always keep the fan off unless I am towing then it is needed.

 

[tones2SS]

So...I just looked at my owners manual. It says no driver input required or available. Other than a tuner, how do you turn it off?

Here ya go!!!