2k RPM MDS Drone

[pizzatots]

Hi all -

Still getting used to the new truck after coming from a 1500 5.7.

When the truck is cruising on the highway at around 2k RPM and the motor drops in to MDS mode, I get a somewhat substantial droning sound if I give it light throttle myself, or if cruise control is picking up speed. My understanding was there is a noise cancelation system, as well as a force dampening/cancelation system on the Hemi, just like on the 1500. I didnt hear much noise from the MDS mode on the last truck - is this normal for these, or is the noise cancelation wonky on my rig?

Thanks!

 

[Poolmonkey]

do you have the Amp steps?..my MDS was crazy annoying until I remove those Amp steps

 

[pizzatots]

do you have the Amp steps?..my MDS was crazy annoying until I remove those Amp steps

I do, but I noticed the drone before the steps were installed.

What about the steps was causing the drone?

 

[pizzatots]

I came across this:

https://static.nhtsa.gov/odi/tsbs/2022/MC-10221444-9999.pdf

@Jimmy07 - whats AVC Transfer Function Routine, and is it in Alfa OBD?

 

[Poolmonkey]

I do, but I noticed the drone before the steps were installed.

What about the steps was causing the drone?

some installs, the vibration dampeners are remounted and not properly…you may not have the dampeners, some don’t

 

[pizzatots]

Yeah I have em. Hopefully they werent remounted.They’re on the hemi and not the cummins.

 

[Poolmonkey]

Yeah I have em. Hopefully they werent remounted.They’re on the hemi and not the cummins.

take a look and see how many bolts are holding them on..should be four. Mine was two, now four again and MDS is ok.

 

[Gatorm]

Old trucks are so nice lol

 

[areuriding]

Disable the MDS...

 

[pizzatots]

Disable the MDS...

Sure. Obvious choice.

But. I have a long commute and it actually helps with mileage. Sure sure. Big truck bad mileage. But if I can eek out a way to not spend as much, it’s a good thing.