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MDS Multi Displacement System Discussion


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  #21  
Old 11-24-2010, 09:30 AM
Bighorn5.7 Bighorn5.7 is offline
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I shut mine down 3 months ago and running the 87 canned tune my mileage improved around town to 13.2-13.5 mpg and is the same as yours on highway. I get 17 mpg at 75mph all day and it jumps right up when at 65 to 19.5-20mpg. my 07 would surge around every corner i took, would start out on 8 and when let off for corner it would go to 4 and then back on the gas to accelerate and back to 8 and cruise was terrible off and on so much you would think it cant be good for it! all a prefference though for me it was just like a new truck! love it and wouldnt go back! Plus exhaust sound great all the time now!
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  #22  
Old 10-11-2011, 05:10 PM
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I'm on the good side of this argument, I love MDS, and the minimal time it takes to kick in is well worth the savings. I have a Mopar cold air intake, AR long throw headers, and Mopar dual exhaust, and when the MDS kicks in doing about 25mph down my street at 1250 rpm, Drone is the last word I'd use. Its the manlyiest deep rumble I've ever herd in a truck, and its literally music to my ears. I recommend the Mopar system all the way, even though it cost a bit more than flowmaster, it makes a good quality sound that any man should enjoy.
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  #23  
Old 10-18-2011, 05:13 PM
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MDS made zero difference for us unless we are on a very long downgrade. Any speed above 65-70 and it just hunts in and out. And forget about MDS in the city. Completely annoying and an utter waste. But of course, that's my opinion. Your mileage on that may vary.

21 MPG? Ummmm, I think not. Is everywhere you drive downhill....both ways? Even before I replaced by OEM tires with 'comfortable' sized tires, we were only getting 18 mpg highway-only; @ 65 mph flat road, no wind.
Maybe with 17" rims, oem tires fully inflated, standard cab, doing 45-50 mph tops, I could see 21 mpg.

Oh how we all WISH we could get that kind of mileage. Sigh.
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  #24  
Old 10-18-2011, 10:25 PM
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I love my performance, so when it takes that second or two after you floor it to drop out of mds and then spool up all 8 cylinders you get left in the dust. Saying byebye to mds gets rid of that lag for me. 'course I still turn it on for long drives.
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  #25  
Old 10-18-2011, 10:46 PM
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I'm all for MDS. I make a 475 mile trip multiple times a year (twice with my new Ram so far), and set the cruise control on 72mph. So far I have gotten 19.5mgp and 19.2mpg, hand calculated, much better than the Suburban I had before. Guess I'll have to check out the mpg while out of MDS on my next trip.
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  #26  
Old 01-09-2012, 10:01 PM
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bought my truck saturday. Drove it home from atlanta... got about 19.5 mpg from atlanta to columbus, ga and then over 20 from columbus to panama city fl. I'm impressed with the MDS so far.
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  #27  
Old 01-10-2012, 02:58 AM
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To be honest I have nothing against MDS, drove 4000 miles on the chrsitmas holiday and my AVG was around 19.7. Wish to get 21 MPG in the RAM, haven't find the way yet, lol.

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  #28  
Old 01-10-2012, 08:05 AM
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The funny thing no one seems to notice is the overwhelming majority of those against MDS are in 3rd gen trucks while those who like their MDS are in 4th gen trucks, especially on the point of how long it takes to automatically switch from 4 to 8 cylinder mode when passing. Evidently Dodge changed something.
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  #29  
Old 01-13-2012, 03:08 AM
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The mds does sound awful with high flow exhaust. Ive been able to eliminate it by running in tow/haul.I don't think the mds makes a big difference.
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  #30  
Old 01-13-2012, 01:18 PM
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There is no right or wrong on this MDS issue...at least when it's working as designed. There is a very strong MDS sensitivity issue. I'm sure there are some scenarios where there may be a malfunction or software tweak that needs to be addressed, but frankly I think most complaints are just based on different many drivers have on their noticing and experiencing MDS feedback. All of us are not the same in what we feel is or isn't acceptable in our vehicles and driving experience. It's not a big deal for me, but I understand how different owners don't like it.

On the mileage issue, I don't see why some on the site have a big problem in believing some of the mileage figures quoted here. While I'm sure there are some cases of "fudging" on the numbers to obtain crowing rights about mileage results, these trucks seem quite capable of producing some very good mileage numbers in many cases. This past weekend I was able to get 19.5 mpg while driving a fairly sustained 73 mph on a 600+ mile highway trip...and that's figured on real mileage and gallons used...no EVIC. I also had a stout, north, side wind during the drive, so I'm fairly well impressed with that. No wind or even a tail wind would have easily broken 20 mpg IMO. The other thing that impressed me was that even in some decent hills, the tranny didn't even unlock out of the converter in top gear. My previous GM truck auto-tranny wouldn't accomplish that at all with much more frequent downshifting.

Even with my aftermarket Borla muffler, cruising on the highway yielded little MDS drone at all that I could detect. I suspect a louder exhaust can really yield some feedback, however.
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