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  #13  
Old 06-16-2016, 10:20 AM
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Re: Why does MDS suck so bad?

Any suggestions on the brand of tuner?


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  #14  
Old 06-16-2016, 11:08 AM
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Re: Why does MDS suck so bad?

Quote:
Originally Posted by GlowingGhoul View Post
I don't know what you're talking about, really. I drive the hell out of my 2015 and MDS doesn't bother me at all. I only notice it when I'm in cruise with ECO on.

How exactly does this affect your driving? There's a ZERO delay for me going from MDS to non-MDS mode when stepping on the gas.
I'll second that. I've had 2 Rams, and a Charger all with MDS. I have never felt any delay associated with MDS activation/deactivation.
Of course there may be some difference in how the Jeep is configured with it, but in my experience I've had zero issues with MDS, and aside from the sound of the exhaust, I can't tell when it's on or not.

Quote:
Originally Posted by Grunter View Post
.... I drive with S selected on the trans almost exclusively. So the few times I've forgotten to flick the lever off D on start-up, and with the softer, slower shifts it has, makes it seem worse than I'm sure it would be, if I normally drove in D only. But it's definitely there.
The difference between S and D, even with a V6 that doesn't have MDS, there is a noticeable difference in shifts. IIRC, the Sport mode (whether automatically using S or manually via paddles) shift times are shortened, and the transmission stays in lower gears longer. The sifts will feel firmer, and being at higher RPM's you'll feel less "sluggishness" as a result of the increased HP and Torque in those ranges. It's possible what you're feeling is delay/lag from the transmission, not from the engine/MDS.
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  #15  
Old 06-16-2016, 11:21 AM
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Re: Why does MDS suck so bad?

I definitely feel the change. There is a lot more vibration from the motor when MDS is engaged. If it kicks in I just give it a little gas for a second to kick it off
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Old 06-16-2016, 01:28 PM
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Re: Why does MDS suck so bad?

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Originally Posted by Heep View Post
I definitely feel the change. There is a lot more vibration from the motor when MDS is engaged. If it kicks in I just give it a little gas for a second to kick it off

Most definitely noticeable. Mine sometimes gives a deep rumble as if it were in the wrong gear then surges forward as the other 4 cylinders come back online.


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  #17  
Old 06-16-2016, 10:47 PM
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Re: Why does MDS suck so bad?

Hmmm. Jeeps must be set up different then, because I've never felt anything like that. Though as mentioned, the audible tone of the exhaust is noticeable. Guess you gotta get a tuner to disable it, or keep using sport mode.
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  #18  
Old 06-18-2016, 03:59 PM
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Re: Why does MDS suck so bad?

sooo what is MDS? lol
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Old 06-18-2016, 04:10 PM
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Re: Why does MDS suck so bad?

Cylinder deactivation under light load. I think the acronym means "Multi-Displacement System"
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Old 06-19-2016, 09:09 AM
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Re: Why does MDS suck so bad?

Corvette's have something similar to this cylinder deactivation called
Active Fuel Management cylinder deactivation I've driven some and never noticed it. MDS might just be garbage in comparison.
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  #21  
Old 06-19-2016, 09:55 AM
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Re: Why does MDS suck so bad?

I don't think I'd call it garbage. Like I said, I've never been able to feel it, and I've had several Rams, and a Chargers with it. Not trying to say it isn't poorly implemented in the Jeep though, since I have no experience with it in GC. Since the mechanical system is the same between the Dodge and Jeep, I'd assume the "garbage" is computer controlling it. I wouldn't be too surprised to find that it's the same computer too, just programmed different. From the sounds of what you guys are saying, it seems the Jeep is taking too long to reactivate the extra 4 cylinders when you need the power.

And by the way, Yeti is correct on the acronym.
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  #22  
Old 06-19-2016, 03:20 PM
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Why does MDS suck so bad?

Quote:
Originally Posted by Shots View Post
I don't think I'd call it garbage. Like I said, I've never been able to feel it, and I've had several Rams, and a Chargers with it. Not trying to say it isn't poorly implemented in the Jeep though, since I have no experience with it in GC. Since the mechanical system is the same between the Dodge and Jeep, I'd assume the "garbage" is computer controlling it. I wouldn't be too surprised to find that it's the same computer too, just programmed different. From the sounds of what you guys are saying, it seems the Jeep is taking too long to reactivate the extra 4 cylinders when you need the power.

And by the way, Yeti is correct on the acronym.

In my experience it is very inconsistent. Sometimes I don't notice it. Other times it feels like it is in too low a gear. The engine rumbles and vibrates and I feel a real heaviness in the drivetrain before the other cylinders engage.

Most likely software is to blame.


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  #23  
Old 06-19-2016, 06:17 PM
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I think the big question is do you see anything gained from MDS? And I would say only benefit is to decrease fuel consumption. I actually had no change in my mileage or slightly better with it off. Thats my own personal driving habits.
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Old 06-19-2016, 09:47 PM
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Re: Why does MDS suck so bad?

IDK if it because I have a 14', or the mods (aFe intake/Corsa full cat-back), but I am at 21k miles know and it has been running amazing! I used to notice it more before I switched to Mobil1 oil...that was about 8k ago...plus I have Toyo non runflats...which may help a little.

I could not be happier with how it drives...hope it stays that way. No issues with MDS; ONLY thing I notice is a 55-60 weird "lag" sometimes when I have been babying the throttle. Otherwise with spirited driving, or Sport Mode as Robert Palmer said appears to eliminate it for my driving: around town and 10+ mile freeway trips weekly 65-80mph
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