MDS on a '16 Sport
- Thread starter taj8250
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Hey guys I have a 2012 Ram 1500 ST Regular Cab with the 5.7L Hemi 6 speed. I bought my truck used with 32k miles on it and it came with a K&N 63 Series Intake and a Flowmasters exhaust.
My question is, when I'm driving with the trans in the D position and not "manual shifting" my truck seems to make a loud "choking" sound or muffle sound from my K&N intake. The exhaust has a weird muffle/gargle to it aswell. But once I put the truck into the "manual shift" mode and I just drive with that in 6th gear, I dont get those noises. Is the noises the MDS system working? It only does it during real light throttle or if I'm in Drive and I'm doing like 35-45 and lightly hit the gas. It seems to do it when I'm in a higher gear and at a low RPM.
It has me concerned because it's something I've never heard on any other vehicle I've ever owned and I've owned all kinds of turbo and non turbo cars with intakes and exhausts.
It almost sounds like my intake is choking and my exhaust is, in a sense, choking aswell. I can't tell if it's the MDS doing this or what.
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My question is, when I'm driving with the trans in the D position and not "manual shifting" my truck seems to make a loud "choking" sound or muffle sound from my K&N intake. The exhaust has a weird muffle/gargle to it aswell. But once I put the truck into the "manual shift" mode and I just drive with that in 6th gear, I dont get those noises. Is the noises the MDS system working? It only does it during real light throttle or if I'm in Drive and I'm doing like 35-45 and lightly hit the gas. It seems to do it when I'm in a higher gear and at a low RPM.
It has me concerned because it's something I've never heard on any other vehicle I've ever owned and I've owned all kinds of turbo and non turbo cars with intakes and exhausts.
It almost sounds like my intake is choking and my exhaust is, in a sense, choking aswell. I can't tell if it's the MDS doing this or what.
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5th Gen Crew
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- Hemi 5.7L
Oh I should also add that when I had my old truck, an 06 Hemi Ram, I put an intake on it and it made almost the SAME exact sounds so I took it off that truck and put my stock intake back on and it went away. At low rpms and light throttle it sounded like the intake was choking or hiccuping. Was that the MDS on that truck aswell?
The reason I'm not too worried about the noises on my 2012 is because my 06 did almost the same thing when I put in an intake so I am just thinking it's an MDS thing but now I want to be sure of it so I figured I'd ask on here. Thanks.
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The reason I'm not too worried about the noises on my 2012 is because my 06 did almost the same thing when I put in an intake so I am just thinking it's an MDS thing but now I want to be sure of it so I figured I'd ask on here. Thanks.
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Last edited:
tones2SS
Senior Member
MDS = Multi Displacement System.
Shuts down 4 cylinders of your 8 cylinder truck to conserve gas when you are putting around town. (Obviously, the more you get on the "GO" pedal, the more gas you will use and the MDS doesn't kick in. There is a way of turning the MDS off temporarily when driving the truck. Just have to redo it every single time you enter and exit the vehicle. Or,....you could buy a new PCM/tuner and it will disabled permanently.)
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Using a DiabloSport T1000 Trinity tuner you can toggle MDS on/off permanently. Otherwise you have to go into manual mode, then set to the max gear (6 or 8). Alternatively MDS is also disabled when overdrive/tow-haul mode is enabled.
tones2SS
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