I just put some $$$ down on an '08 Steel Blue that has a ship date of July 23rd. On the build sheet under equipment it has "ESF" with the description of, "6.1L SRT HEMI MDS V8 Engine". Does the '08 have MDS? ...or could this be a description someone mistyped into the system?

Mike

gotta be a misprint

I just put some $$$ down on an '08 Steel Blue that has a ship date of July 23rd. On the build sheet under equipment it has "ESF" with the description of, "6.1L SRT HEMI MDS V8 Engine". Does the '08 have MDS? ...or could this be a description someone mistyped into the system?

Mike


My Plum Crazy SRT8 Chargers that are coming say the same thing on them.........

I just put some $$$ down on an '08 Steel Blue that has a ship date of July 23rd. On the build sheet under equipment it has "ESF" with the description of, "6.1L SRT HEMI MDS V8 Engine". Does the '08 have MDS? ...or could this be a description someone mistyped into the system?

Mike

If it has the MDS, I want it.

That is if you are refering to muntiple displacement system, as in gas saver.

gotta be a misprint

I just put some $$$ down on an '08 Steel Blue that has a ship date of July 23rd. On the build sheet under equipment it has "ESF" with the description of, "6.1L SRT HEMI MDS V8 Engine". Does the '08 have MDS? ...or could this be a description someone mistyped into the system?

Mike

Hey mingoglia,

I have a July 17th ship date, but havent seen a build sheet...where did you get it?

Champion - Maybe you could help out here too...

Thanks!

A guy here at the office was my final push to buy the Jeep SRT8. He has had a '07 Charger SRT8 for a few months now and took me for a ride in it. When I shoed him this build sheet he said he had the MDS in his Charger R/T he had before his SRT8 and said he could feel the transition when the MDS would activate. He said it was annoying at times. He did say he also believes it to be a misprint.

Mike

Hey mingoglia,

I have a July 17th ship date, but havent seen a build sheet...where did you get it?

Champion - Maybe you could help out here too...

Thanks!

It's funny you should bring that up. I was surprised to see it as well. Here's a little history on this. I'm a member of a local Jeep club here in AZ as I'm in to rock crawling (I have a TJ). Anyway, one of the forum sponsors is a local Jeep dealer. I happened to go by there to check out the steel blue color before ordering from Champion. He pulled a list of the SRT8's he had on order and 4 of them were 07's and one was an '08 in steel blue. He was actually surprised to see it especially since it HAS prices on it. I haven't heard of anyone else having prices yet on these. He tried building one, but the pricing is unavailable, but this particular '08 does in fact have pricing on it. I have the VIN number on here, and the correct place in the vin does show it as an '08 as well. Because of this, I put my $500 down on it. I have a contract showing what they'll sell me the vehicle for so if it turns out to be some freak thing where they have '07 pricing on an '08 I do have something in writing showing the VIN number and what they're charging me for it. I don't know how much of a guarantee it is, but we'll see.

Anyway, I'm not sure if this is what's referred to as a build sheet, but this is what it has on it...
Estimated ship date
Ordere date
VIN
Order Status (D1)
VON
All the equipment with MSRP and FWP
Customer name (which was changed from the dealership to my name).

So if this sounds like what's referred to as a "build sheet" then that's what I have. If not, I'm not sure what you call this. :o I could scan it in when I get home I suppose.

BTW, Champion:
I still may order a vehicle from you. The one I have in my name only has the Option Group I and I really really want the self leveling XENON lights. I just wanted to put some $$$ down on this one to insure I had a spot while I figure out if I want to go to the aftermarket to upgrade the lights. This Jeep has everything else including Navigation.

Mike

It's funny you should bring that up. I was surprised to see it as well. Here's a little history on this. I'm a member of a local Jeep club here in AZ as I'm in to rock crawling (I have a TJ). Anyway, one of the forum sponsors is a local Jeep dealer. I happened to go by there to check out the steel blue color before ordering from Champion. He pulled a list of the SRT8's he had on order and 4 of them were 07's and one was an '08 in steel blue. He was actually surprised to see it especially since it HAS prices on it. I haven't heard of anyone else having prices yet on these. He tried building one, but the pricing is unavailable, but this particular '08 does in fact have pricing on it. I have the VIN number on here, and the correct place in the vin does show it as an '08 as well. Because of this, I put my $500 down on it. I have a contract showing what they'll sell me the vehicle for so if it turns out to be some freak thing where they have '07 pricing on an '08 I do have something in writing showing the VIN number and what they're charging me for it. I don't know how much of a guarantee it is, but we'll see.

Anyway, I'm not sure if this is what's referred to as a build sheet, but this is what it has on it...
Estimated ship date
Ordere date
VIN
Order Status (D1)
VON
All the equipment with MSRP and FWP
Customer name (which was changed from the dealership to my name).

So if this sounds like what's referred to as a "build sheet" then that's what I have. If not, I'm not sure what you call this. :o I could scan it in when I get home I suppose.

BTW, Champion:
I still may order a vehicle from you. The one I have in my name only has the Option Group I and I really really want the self leveling XENON lights. I just wanted to put some $$$ down on this one to insure I had a spot while I figure out if I want to go to the aftermarket to upgrade the lights. This Jeep has everything else including Navigation.

Mike

Soooo,

You're not going to tell us what the pricing is on it??? :eek:

Please fill me in, so I can at least have an idea.

THanks!

Soooo,

You're not going to tell us what the pricing is on it??? :eek:

Please fill me in, so I can at least have an idea.

THanks!

Here goes:
Base vehicle MSRP 40,525 FWP 37,312
Sunroof MSRP 800 FWP 704
Option Group I MSRP 1,995 FWP 1,756
Nav/Rear backup camera MSRP 1,090 FWP 959

Under total price HB is 1,332, FFP is 41,561 EP is 40,188 I'm not sure what all these mean.

My price before fees is $42,981 On top of that I have to pay tax and a $369 doc fee.

I'm curious if this sounds like '07 pricing. What I do know is I have a document I signed entitled "Retail order for a motor vehicle, that has the vin and all the appropriate info that has an actual price listed...that I signed. So if it is '07 pricing I'm not sure what would happen once I actually tried to take delivery.

Mike

Does anyone who's driven a 5.7L w/MDS know if it has a hesitation/lag when quickly stomping the loadpedal while the vehicle is in "fuel saver mode"/less cylinders firing?

Does anyone who's driven a 5.7L w/MDS know if it has a hesitation/lag when quickly stomping the loadpedal while the vehicle is in "fuel saver mode"/less cylinders firing?

I've never driven one but my coworker (who now has a Charger SRT8) had a Charger R/T and he said that sometimes he would literally have to floor it for it to transition out of the MDS mode. His vehicle was an '05 so perhaps the algorithm has been improved.

Mike

I wouldnt want it at all... if I was worried about gas mileage id buy a freakin scion or ford focus or some stupid ugly hybrid

I've never driven one but my coworker (who now has a Charger SRT8) had a Charger R/T and he said that sometimes he would literally have to floor it for it to transition out of the MDS mode. His vehicle was an '05 so perhaps the algorithm has been improved.

Mike
I figured as much. It seems to me that there would be a hesitation. IMO, I don't need anymore hesitation. I want it to go when I mash that gas pedal! :) If Mopar had a switch to disengage MDS it might be OK.

I have a Charger RT. I have never noticed lag with MDS. I can not even tell it is on unless I look at HAL to see my MPG. There is a big difference, when it is on I get 25MPG. When it is not on, I get 16.

I just put some $$$ down on an '08 Steel Blue that has a ship date of July 23rd. On the build sheet under equipment it has "ESF" with the description of, "6.1L SRT HEMI MDS V8 Engine". Does the '08 have MDS? ...or could this be a description someone mistyped into the system?

Mike
The 6.1L engine is being updated to include MDS. I was told it was going to be starting in the 2009 model year, but it's possible it may make it into the 2008 models...

I have an '05 Magnum R/T with the 5.7 Hemi which has the MDS. My right foot prohibits its use, but on the rare occasion that the bride gets it to kick in I'd rather do without it...mainly due to the exhaust drone and lack of appreciable (gas mileage) benefit...

I'm not a super-technical guy, but if you want (1) performance and (2) the ability to tune, you don't want MDS. You can read at length on the LX forum how it can completely reek havoc when doing heavy mods, (particularly when it comes to cams and F.I.) and the biggest concern/desire is how to deactivate it.

It engages and disengages rather seamlessly and outside of the exhaust drone you'd never know it was "working". I recall the time to disengage being something like 1/100th of a second; and without knowing whether or not that's exactly true I never experienced any hesitation getting it to disengage...

FWIW...

Matty

Ronin, can't MDS be eliminated w/some work to the heads(plugs)?

i was under the impression that mds engages when 1. cruise control is on and in the range of 40-60 mph and the fuel economy achieved is somewhere around 3mpg. Is this not so?

Here goes:
Base vehicle MSRP 40,525 FWP 37,312
Sunroof MSRP 800 FWP 704
Option Group I MSRP 1,995 FWP 1,756
Nav/Rear backup camera MSRP 1,090 FWP 959

Under total price HB is 1,332, FFP is 41,561 EP is 40,188 I'm not sure what all these mean.

My price before fees is $42,981 On top of that I have to pay tax and a $369 doc fee.

I'm curious if this sounds like '07 pricing. What I do know is I have a document I signed entitled "Retail order for a motor vehicle, that has the vin and all the appropriate info that has an actual price listed...that I signed. So if it is '07 pricing I'm not sure what would happen once I actually tried to take delivery.

Mike

Thanks for posting that...I really do appreciate it. I just wish all of it made sense to me. Oh well.

Still waiting for Don to give me some more good info.

Same here, no hesitation engaging or disangaging the MDS on my 5.7L jeep. The only way I can tell is active or not is because of the exhaust tone of my Magnaflow, and with the DashHawk it also lets you know if its active or not.

I bet the reason they added MDS to the 6.1L in a hurry is do to the current gas prices, I personally think it will be a good selling feature for them, I know some of us prefer performance over mpg but I also know some care about mpg on the 6.1L especially if it'll be a daily driver.

Personally I think (and I hope) it won't do any difference in performance comparing it to the '06s or '07s.

It would be nice if with the upcoming Predator from DiabloSports or other hand helt tunners you can shut MDS off, thats if it doesn't come with a switch from factory,something that the 5.7L line don't have as an option, but maybe the SRT engineers can make that happen.

If Mopar had a switch to disengage MDS it might be OK.
Is MDS mechanically or electronically engaged(it functions mechanically I believe)? IMO, less moving parts the better. Like QBN said, it will help Chrysler sell more.

The 6.1L engine is being updated to include MDS. I was told it was going to be starting in the 2009 model year, but it's possible it may make it into the 2008 models...

Resume,

What about for the 6.4L? Is MDS also in the works for it? Is the 6.4L still going into the 09 SRT8's? Will the 6.1L be used in the non-SRT models?

Resume,

What about for the 6.4L? Is MDS also in the works for it? Is the 6.4L still going into the 09 SRT8's? Will the 6.1L be used in the non-SRT models?
No mention of MDS for the 6.4 at this time, I don't believe it will be offered in the first year or two.

6.4 is still on the schedule for some of the 2009 models. I may not have 100% confirmation until a little later in the year.

Rumors point to the 6.1 being offered in some of the R/T models like the Challenger, don't have any solid info yet on its application in other models.

No mention of MDS for the 6.4 at this time, I don't believe it will be offered in the first year or two.

6.4 is still on the schedule for some of the 2009 models. I may not have 100% confirmation until a little later in the year.

Rumors point to the 6.1 being offered in some of the R/T models like the Challenger, don't have any solid info yet on its application in other models.

Well I really hope they decide to put the 6.4 in the SRT8's. It is what I am basing my time over here in Iraq with. I am holding out for an '09 unless the '10 model has some option that I just can't live without. In that case I will just have to spend a few more months over here.

I know that there are ways to tamper with the mds. I met a guy at the local drag strip (firebird raceway) He has a Magnum R/T and he wired up a MDS defeat switch and he somehow is able to activate it when ever he wants. He is getting something like an average of 25 mpg.

I know that there are ways to tamer with the mds. I met a guy at the local drag strip (firebird raceway) He has a Magnum R/T and he wired up a MDS defeat switch and he somehow is able to activate it when ever he wants. He is getting something like an average of 25 mpg.I defeat my MDS by throwing it in 4th gear lol, once it's in 4th MDS wont kick in.
I'm sure anyone savy enough about how this thing works can defeat it with a switch, but it would be nice to have it right from factory.

I had a 300C with the 5.7L and the MDS is not noticeable at all. Just tipping in the throttle will take it out of that mode. Yes, it does wreak havoc with mods. You have to work around a lot to mod an MDS car. If you use the wrong exhaust, you will get a nasty drone that sounds like the car is severly missing.

One way to prevent MDS from engaging is to use heavier oil. The use of 5-20 oil is mandatory with the MDS, as oil pressure is used to engage/disengage the solenoids that operate the MDS. If you use heavier oil, the MDS will not function.

Anyone know approximate MPG benefit from MSD?

Oops nevermind

I have a Charger RT. I have never noticed lag with MDS. I can not even tell it is on unless I look at HAL to see my MPG. There is a big difference, when it is on I get 25MPG. When it is not on, I get 16.

That's pretty signficant diff. I hope MSD is included in 6.4L in 09 along with a six speed auto tranny.

...If you use heavier oil, the MDS will not function.
It will still function, but intermittently. Not a good idea.

Originally Posted by nottarts
I have a Charger RT. I have never noticed lag with MDS. I can not even tell it is on unless I look at HAL to see my MPG. There is a big difference, when it is on I get 25MPG. When it is not on, I get 16.

...That's pretty signficant diff. I hope MSD is included in 6.4L in 09 along with a six speed auto tranny.
There is NO WAY that MDS would get anywhere near an improvement of 25mpg from 16, someone is dreaming or has their numbers mixed up. I could see 16-city in the R/T when stomping on it all the time, and maybe 25 highway if really taking it easy, but even that is a stretch.

MDS will typically offer a 5%-10% average improvement is all. The 5.7L Grand Cherokee rates MDS at a 6% improvement. Not sure what the 6.1 gain will be.

There is NO WAY that MDS would get anywhere near an improvement of 25mpg from 16, someone is dreaming or has their numbers mixed up. I could see 16-city in the R/T when stomping on it all the time, and maybe 25 highway if really taking it easy, but even that is a stretch.

MDS will typically offer a 5%-10% average improvement is all. The 5.7L Grand Cherokee rates MDS at a 6% improvement. Not sure what the 6.1 gain will be.

I know someone with the 5.7 MDS GC, he claims his gas mileage is 13/17. Not much better than what I see in the SRT8.

There is NO WAY that MDS would get anywhere near an improvement of 25mpg from 16, someone is dreaming or has their numbers mixed up. I could see 16-city in the R/T when stomping on it all the time, and maybe 25 highway if really taking it easy, but even that is a stretch.

MDS will typically offer a 5%-10% average improvement is all. The 5.7L Grand Cherokee rates MDS at a 6% improvement. Not sure what the 6.1 gain will be.


MDS only works in easy cruising so it only applies to highway numbers. My window sticker says city: 17 Highway: 25. So if I'm confused on how to read HAL, then the EPA must be confused too.

There is NO WAY that MDS would get anywhere near an improvement of 25mpg from 16, someone is dreaming or has their numbers mixed up. I could see 16-city in the R/T when stomping on it all the time, and maybe 25 highway if really taking it easy, but even that is a stretch.

MDS will typically offer a 5%-10% average improvement is all. The 5.7L Grand Cherokee rates MDS at a 6% improvement. Not sure what the 6.1 gain will be.


and I"ve gotten 28MPG during 300 miles between Seattle and Portland. I was going about 70 the whole way.

MDS only works in easy cruising so it only applies to highway numbers. My window sticker says city: 17 Highway: 25. So if I'm confused on how to read HAL, then the EPA must be confused too.
You are still a bit confused :)

You claimed:

"There is a big difference, when it is on I get 25MPG. When it is not on, I get 16"

Your mileage does not jump from 16 to 25 MPG when MDS is engaged, nor does it drop from 25 to 16 when it is not engaged.

MDS does NOT make "a big difference" in your overall average mileage. At best, an extra mile or two per gallon.

Anyone figure out how to create an on/off switch for MDS yet? If you could force it to stay in half-cylinder mode more often, rather than relying on tempermental throttle and load finess, then you'd surely see better gains ... plus it could be totally deactivated for performance tuning purposes.

..........Oh Blown7?!?!?!? Can you figure out the mechanism that needs to be modulated from all of those manuals you've been reading?

2008 Grand Cherokee SRT8 (WKJeeps.com exclusive advance info)


Production starts July/August 2007
6.1L Hemi MDS engine 420hp (standard)
W5A580 5-speed Transmission (standard)
Redesigned instrument panel, seats, steering wheel and door trim panels
Exterior - Redesigned headlamps, grille, fascia
EVIC controls moved to steering wheel
Power outlet, 115 volt (2-prong)
Radio model RER, MyGIG Touch-screen media System with navigation (AM/FM/MP3/DVD/HDD)
Radio model REN, MyGIG Touch-screen media System without navigation (AM/FM/MP3/DVD/HDD)
Eight-inch rear DVD video screen
Seats, heated second row
Sirius Satellite Streaming Video (optional, requires rear DVD system)
Tilt / Telescoping steering wheel (manual)
High Intensity Discharge (HID) Headlamps with auto leveling
New interior color: Dark Slate Gray (replaces 2006-2007 Medium Slate Gray)
Exterior colors: Black, Bright Silver Metallic, Red Rock Crystal and Steel Blue Metallic
========================

2009 Grand Cherokee (WKJeeps.com exclusive advance info)


Production starts July 2008
New Bluetec 50-state clean diesel engine
New 2nd generation 5.7L MDS Hemi engine w/increased horsepower and fuel economy
New 500-hp (est.) 6.4L-Hemi engine for the SRT8
New ignition system
Adaptive cruise control?
Cooled front seats?

I had an '05 5.7 MDS. After putting on a magnaflow, you could clearly tell when the vehicle went in and out of MDS. The factory programming is very interesting. When on the highway, it seems the torque converter would slightly unlock when MDS kicked in sending the rpm's up a bit. Give it a bit of gas, and the MDS disengaged and the rpm's actually dropped.

At slower speeds, the MDS definitely activated and deactivated as well.

All very trick.

But from a mileage standpoint, I felt it made little if no difference. The mileage in the 5.7 was bad. Unless you did almost all highway driving, it was not much better the non-MDS'd 6.1. (Except it didn't require premium!)

But from a mileage standpoint, I felt it made little if no difference. The mileage in the 5.7 was bad. Unless you did almost all highway driving, it was not much better the non-MDS'd 6.1. (Except it didn't require premium!)

This seems to match the experience my friend has with the 5.7 GC (mentioned in post #32 in this thread).

http://www.wkjeeps.com/wk_srt8.htm

Even this website says the new 2008 SRT8 GC has a 6.1 Hemi with MDS

LOL :) Welcome