Multi Displacement System

[Babyboomer 1949]

Does the Multi Displacement System operate smoothly as reported by several of the car magazines? Has anyone been able to detect the deactivation when accelerating or cruising?

[BrilliantBlackHemi]

In my test drive, I could NOT detect it.

[dodgeatheart]

In my test drive, I could NOT detect it.

Neither could I.

[SuperDave]

I believe that I can feel the MDS going FROM four to eight cylinders. It's just a slight shudder, but I'm fairly certain that's what it is. While crusing at 60 increase the gas just a little bit and you'll feel it kick in. You can also see the difference in the average MPG if it is reset just before doing this. It's not a terrible thing, but I swear I can feel it...

[hawk]

My dealer told me that MDS is disactivated until the customer tells them to activate it (sounds wierd), that might EXPLAIN why we didn't feel it on the test drive.

[BlackMagnum]

That sounds doubtful.

My dealer told me that MDS is disactivated until the customer tells them to activate it (sounds wierd), that might EXPLAIN why we didn't feel it on the test drive.

[EasyRider300C]

My dealer told me that MDS is disactivated until the customer tells them to activate it (sounds wierd), that might EXPLAIN why we didn't feel it on the test drive.

Don't believe eveything the dealer tells you. For the most part, they know a lot less about the car than we do. I swear they make stuff up as they go along. Kind of like John Kerry.

[BlackMagnum]

Maybe they believe they've been chosen by god to give us misinformation. ;)

My dealer told me that MDS is disactivated until the customer tells them to activate it (sounds wierd), that might EXPLAIN why we didn't feel it on the test drive.

Don't believe eveything the dealer tells you. For the most part, they know a lot less about the car than we do. I swear they make stuff up as they go along. Kind of like John Kerry.

[lexball50]

I believe that I feel it. Lets say I take off on a light and increasing speed up to 40 mph when you take your foot off of the gas the car instantly kinda throws you slightly forward. It doesn't go slower or anything and is barely noticable. I know it sounds crazy, because if you accel fast in any car and then take your foot off of course you have a tendency you lean forward, but this is a little different. You have to have drive one to understand. But then again not sure if the car is just so fast that when you take off, you naturally fall forward because of physics.

[SSGP2u]

What is it that I hear when I'm driving like 20-40 mph. It sounds like a four cylinder ticking sound.

[FloridaRT]

I must be dense, I have never felt it...............

But then, I am 67 years old................haven't felt a lot of things lately.

LOL

Bob

[CJ7VFR]

My dealer told me that MDS is disactivated until the customer tells them to activate it (sounds wierd), that might EXPLAIN why we didn't feel it on the test drive.


Sounds like your dealer is setting you up for another "add on" cost if you try to
purchase your vehicle from them.

I can see it now:

Dealer: "Why yes, that new 5.7 Hemi powered Magnum R/T does come with the MDS system
so the car can get 20 percent better gas mileage, so you can save on gas."

You: "Wow, thats great, I love to save money."

Dealer: "Oh, but wait, we have to activate it for you. We will have to add an
additional $500.00 to the purchase price of the car. But, thats a bargain compared
to what you are going to save in gas money over the life of the car. You should do
it!! Its worth it!"

You: "Oh, really. I thought it came with the car. I have to pay for it? Everything
I have read, every article, every manual, every blog, every forum, even Dodge's own
website says the MDS is standard on all 5.7 Hemi engines straight from the factory.
Heck, even all the Chrysler factory stuff says it, as well as all the Chrysler websites
as well as every single brochure I have seen about the 5.7 Hemi powered cars."

Dealer: "No, you have to pay US to activated it for you. But its worth it. Would
we LIE to you?"

With the stock exhaust, I NEVER felt it on my 300C, nor did I ever hear it.

Once I replaced my exhaust with the Magnaflow cat-back, I can hear the difference
in the exhaust note when its in 4 cyl mode. But, even then, I can't actually "feel" it
switch back and forth. I can just "hear" it.

Jim

[done]

Sounds like your dealer is setting you up for another "add on" cost if you try to
purchase your vehicle from them.




Did you notice this thread is from May of 2004? It has been around longer than you have and you are an old hand.

[Pickle R/T]

I cant feel it ,but I can hear it with the exhaust that I have on.

[Super T]

You can hear it w/ aftermarket exhaust... Otherwise, you'll never know it's there. In 18,000 miles, I swear I never knew if it was on or off. They claim 0.04 seconds for the down cylinders to come back online, and I believe it.

It does not (can not) be activated or deactivated by a dealer, it's just plain there. If you want it out, you have to change some internals and some programming.

[Displaced Hokie]

Sometimes I can feel a little stumble/hickup if the cruise is on, but that's rare. Others have felt that too, but you have to be pretty "in tune" with your car - i.e. care way to dang much about it. :wink: It's really amazing how transparent it is, but it sure works. I checked the MPG today after my wife had been driving all week...24.8MPG! :banana:

[drumlugr]

You mean only MY HEMI R/T feels like the after-burners have been lit on an F-18 fighter jet when the MDS kicks off!?! Seriously, to me, it's like a subtle transmission upshift that you feel in the seat of your pants. It's hardly noticable until you begin to anticipate it happening.

[bigjim]

Did you notice this thread is from May of 2004? It has been around longer than you have and you are an old hand.


LOL, and whats your point? How are you and the misses doing Don? Montreal in the spring? I think we should all show up at Carstens on Memorial Day weekend even if he knows NOTHING about it! It may be easier on him! We just have to get Jaak and Token in on it and it will fly!

[bigjim]

Hmmm, Got myself thinking. Gotta PM Jaak.

[MeSteve]

I notice it everytime it kicks on or off. I think I cursed myself when it was new and I found the MPG readout. I thought I would try to see how good I could get it and now I feel it every time. Just a slight bump.

[done]

LOL, and whats your point? How are you and the misses doing Don? Montreal in the spring? I think we should all show up at Carstens on Memorial Day weekend even if he knows NOTHING about it! It may be easier on him! We just have to get Jaak and Token in on it and it will fly!


We are doing great down in Puerto Vallarta. We will be back to Nashville in April. I think Jaak and Token ought to do something in Toronto.

[bigjim]

Hmmm. That sounds like an idea, give Carsten a break. Pming Jaak.

[Jaak]

LOL, got your PM! Thanks!!! (I think...)

In reality, I'd absolutely love to have an event in Toronto. I have absolutely no idea at this moment what, when, where as I only got Jim's PM a couple of minutes ago, but I'll subscribe to this thread and we can think of something...

Let's see, ideally, the same time of year, right? Somewhere to meet, and somewhere to go have some fun running cars on a dragstrip (which makes it Toronto Motorsports Park at Cayuga, which is about 90 minutes out of town) and maybe something cool about the event.

Hmmm.....

[done]

LOL, got your PM! Thanks!!! (I think...)

In reality, I'd absolutely love to have an event in Toronto. I have absolutely no idea at this moment what, when, where as I only got Jim's PM a couple of minutes ago, but I'll subscribe to this thread and we can think of something...

Let's see, ideally, the same time of year, right? Somewhere to meet, and somewhere to go have some fun running cars on a dragstrip (which makes it Toronto Motorsports Park at Cayuga, which is about 90 minutes out of town) and maybe something cool about the event.

Hmmm.....

Let's quit hi"jaak"ing this thread. Go here:

http://www.lxforums.com/board/showthread.php?p=1301258&posted=1#post1301258

[oldschoolhemiguy]

I couldn't detect the change at all. Until I installed my JBA system now I can hear the change but still don't feel it at all. I do see the mpg change

[bubbamagnum]

I feel just a slight hesitation, but I have never drove one without this feature... so it could be in my head??

[SSGP2u]

When does the MDS normally kick in?

[done]

When does the MDS normally kick in?

On an ummodified car, above 20 mph, light throttle and below about 85 mph. Most commonly when using cruise control on a highway.

[Hemi 7]

Neither could I

[cm2005300]

i cant feel it at all on my 2.7 v6 hmmmmmmm weird



























hahaha just playin

[Centurion]

On an ummodified car, above 20 mph, light throttle and below about 85 mph. Most commonly when using cruise control on a highway.

I-5 Southbound from HWY 152 for about an hour, triple digit speed with MDS ON getting 22 MPG... MDS doesn't work so well between 85-100 but then it hits the power band in 5th so it can go back to 4-cyl, at least that's my experience...

[gooeytek]

Sounds like your dealer is setting you up for another "add on" cost if you try to
purchase your vehicle from them.

I can see it now:

Dealer: "Why yes, that new 5.7 Hemi powered Magnum R/T does come with the MDS system
so the car can get 20 percent better gas mileage, so you can save on gas."

You: "Wow, thats great, I love to save money."

Dealer: "Oh, but wait, we have to activate it for you. We will have to add an
additional $500.00 to the purchase price of the car. But, thats a bargain compared
to what you are going to save in gas money over the life of the car. You should do
it!! Its worth it!"

You: "Oh, really. I thought it came with the car. I have to pay for it? Everything
I have read, every article, every manual, every blog, every forum, even Dodge's own
website says the MDS is standard on all 5.7 Hemi engines straight from the factory.
Heck, even all the Chrysler factory stuff says it, as well as all the Chrysler websites
as well as every single brochure I have seen about the 5.7 Hemi powered cars."

Dealer: "No, you have to pay US to activated it for you. But its worth it. Would
we LIE to you?"

With the stock exhaust, I NEVER felt it on my 300C, nor did I ever hear it.

Once I replaced my exhaust with the Magnaflow cat-back, I can hear the difference
in the exhaust note when its in 4 cyl mode. But, even then, I can't actually "feel" it
switch back and forth. I can just "hear" it.

Jim

Tell him you don't want it installed on your 5.7 :)

[Mr.Mopar]

I can feel a hesitation and shudder at about 1200rpm when lugging the engine along with the pedal only slightly depressed. Especially on grades. I don't know if it's detonating or the MDS is constantly kicking in and out. I can hear the sound only if the drivers window is open and radio is off. It isn't very loud. It does sound something like detonation. I use 89octane as recommended and usually our air here is so cool and dense that detonation isn't a problem. My neighbourhood and the area I normally cruise around in is only about 1800' above sea level.