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MDS Multi Displacement System Discussion


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  #1  
Old 09-13-2012, 03:56 AM
Captain Cooter Captain Cooter is offline
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Default MDS Lifter Delete

Anybody know if this is a sure-fire way to disable MDS? Since we cannot flash the ECU this makes perfect sense. My only concern is if it triggers a DTC and won't pass emissions. I'm considering a mild cam and saw the lifter deletes. I may shoot them an email and ask, just thought I'd run it by yall.

http://inertiamotorsports.com/camshafts.html
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Old 09-13-2012, 08:06 AM
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It's a 100% fix if you want to delete it. It's the same non-collapsible lifters that are in your other 4 cylinders. I can't guarantee that you won't their a code since everyone I know that has done it has tuned their vehicle and disabled it.
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Old 11-07-2013, 09:06 PM
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i believe programmers can turn it off if you are using one
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Old 11-07-2013, 09:13 PM
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Correct, but at a certain cam lift you can collapse the lifters, which is why there is a delete kit available. The only way to handle this is to physically remove the collapsible lifters.
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Old 11-07-2013, 09:28 PM
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The MDS Camshaft is also ground differently

My thought is, the 1500 MDS engine that uses 5w-20 & the 2500 NON MDS engine that uses 10w-30 blocks are the same engine
it is the camshaft & lifters that are different
the rest of the sensors & stuff could be left off of the 1500 engine & it would not mess with passing smog tests, because they are testing the smog of a working 8 cylinder engine, not a engine that is running on 4 cylinders

MDS i don't believe has anything to do with smog, it was only done to pass the Federal Government's CAFE Mandates

EDIT:
the question would have to be, will the check engine light come on, if it does, it won't pass smog
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Old 02-05-2014, 08:21 PM
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Easiest and cheapest is just put it in "6". When its cold I automatically bump into "6" to make more engine heat faster, I don't even think about it anymore, its habit.
Any more for in town I just hit "tow/haul", again habit.
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Old 02-13-2014, 08:37 PM
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Quote:
Originally Posted by oldhp View Post
Easiest and cheapest is just put it in "6". When its cold I automatically bump into "6" to make more engine heat faster, I don't even think about it anymore, its habit.
Any more for in town I just hit "tow/haul", again habit.
That's exactly what I do, funny my Tradesman with the single exhaust is much more obnoxious when MDS kicks in than my Express.
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Old 02-14-2014, 12:50 PM
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I use the DCX 1000 programmer from Diablo to turn off MDS. Prior to getting the programmer I did what the others stated which is to shift to 6 or put the vehicle in Tow/Haul mode. Both of these work fine, however I am very pleased with the programmer as you do not have to mess with pushing any buttons once you set it to turn off MDS.
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