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MDS Multi Displacement System Discussion


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  #1  
Old 05-29-2012, 05:23 PM
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Default RPM with and without MDS

When MDS is engaged or disengaged, what is the RPM when cruising at 65mph on the freeway?

I have an 08 4x4. I have mine tuned with MDS off. Truck is running about 1600 RPM on the freeway at 65mph. I've noticed what might be the MDS drone, but I recently swapped mufflers and it might just be that I am still adjusting to them.

My buddy has an 06 with no MDS and he runs at 2000 RPM at 65 on the freeway.

Could it be that even though I set my Trinity's parameters to shut MDS off, that it is in fact still engaging?
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Old 05-29-2012, 06:33 PM
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If your friends Ram is a 2006 1500 model with a HEMI, he has MDS
if it is a 2500 or 3500 it will not have it

I drive my 2009 HEMI powered Ram across the flats with 1000 pounds of extra weight in it
you can see for yourself the speed, RPMs, outside temperature, & MPG

The MDS is engaged in this photo, it reads FUEL SAVER on mine when it is engaged
Cruise Control is also on

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Last edited by GTyankee; 05-29-2012 at 06:36 PM.
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Old 05-29-2012, 11:01 PM
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I'd double check to see if you've actually deactivated the MDS. After that I'd check if you're just running in O/D and getting that low RPM as my '07 can sound pretty weird when cruising at highway speeds. I have my MDS programmed out with a custom tune and even with my cutout it will sound limp at low RPM when cruising.
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Old 05-29-2012, 11:09 PM
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it is definitely set to off. Im thinking its just the different muffler. Thanks for the replies.
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Old 08-20-2012, 04:39 AM
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I'm sure he has different gears or different size tires....
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