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  #1  
Old 10-24-2010, 11:10 PM
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Question MDS issues? Maybe?

So! I have an interesting issue with my truck (2008 dodge ram 1500 5.7 Hemi 4X4). Ever since I put my new 33's on my truck...even at 100K cruising on flat road, the MDS does not kick in! Gah! As if it's not worse on fuel already! Any idea's? I am wondering if they are just to much unsprung weight and the truck doesn't like it or if their is a way I can force it's activation in that situation. Any idea's?

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Old 10-24-2010, 11:12 PM
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Well im assuming that the 33s are not stock size so it could be throwing the computer, its speed sensing and maybe some other things outta whack. Try getting a superchips programmer and changing your tire size. Im sure someone w/ more knowledge than me will chime in but thats the only thing that makes sense to me.
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Old 10-24-2010, 11:17 PM
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I have to ask, is yours a 1500 or 2500 or greater, only the 1500 5.7L has MDS

seeing that you have the Big Horn model, it maybe a 2500 with a 1500 tag, It would NOT have MDS
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Old 10-24-2010, 11:19 PM
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I'm guessing you will not much of MDS any more. As soon as you install bigger shoes, it takes more torque to turn them....and torque and MDS never play in the same sand box.

You 'might' be able to convince MDS to come out an play at about 60-70 ks.....on a down grade, but only if you are in normal drive. If you are using tow/haul....you will never get MDS.
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Old 10-24-2010, 11:58 PM
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I agree with beer but also i put my friends 35s on the back one day and i could still spin them off the line and the mds still kicked in so i maybe there is an issue?
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Old 10-25-2010, 12:04 AM
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Check your RPM running down the road in OD @ 60 mph and see where it's at. Then let us know what it is.
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Old 10-25-2010, 12:06 AM
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After you put the 33's on did you take it to the dealer to have the computer adjusted to recognize the change in tire size? If you not, your speedo is likely off too.
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Old 10-25-2010, 12:11 AM
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Yeah...but I reset the bully dog programmer to have 33's and I know it's odd...it is a 1500 according to the vin at least...which is pretty dependable...It will kick in and I can hear it (only time the mds drone in my exhaust is actually wanted) sometimes when I'm driving slower, mind you it does have 392 gear in the back...so it didn't like it normally anyway. But I'm just surprised, and it flicks into it and out of it randomly as it cruises on the highway as well
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Old 10-25-2010, 12:12 AM
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also should mention it didn't do this before the tires....So I know they must be the issue but I can't seem to figure out why. and the 33's are only .8 of an inch bigger! mind you alot wider but still...

also added a picture of my speed-o
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Old 10-26-2010, 09:04 PM
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Hmm that is pretty interesting. The motor should still recognize the truck at a cruising speed. This should be all it needs to kick the MDS in.The speedo might be off like 2-3km/hr so it shouldn't kill the MDS off the truck. People buy programmers just to shut it off, I doubt you can just do it with bigger tires. Something else must be wrong

I took a look at your speedo man and it looks like mine at 100kms. Mine at 120kms is about 1800rpm
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