This was 1981, the worst decade for horse power(in the modern scheme of things). At least they gave it the boot after one year of trying. It was an out of the box concept though, I have to give credit for that.
Cadillac used these mechanical solenoids (through the valve rocker cover) that deactivated the rocker.
The processor (this was very early electronics of 1981) didn't work effectively to make those transitions from 8 to 6 to 4 cylinder operation (depending on load / demand on engine) and it would tend to "hang" and not revert back 8 cylinders when the driver needed it, adding to driveability issues.
The other part is 140hp (yes that low) pulling around full size Cadillacs...by comparison many N.A. 4 cylinder engines today outdo what that 6.0 liter Caddy V8 could put out.
Imagine it chugging in 4 cyl mode and pressing on the throttle and it doesn't change back into 8 cyl mode. That thing would have fallen on its face!
To the OP, I recently went back to the 392 from the 5.7L, your description in your original post about MDS is both accurate & normal. The 392 will not engage MDS nearly as often, that's the intended strategy in street mode.
If you put the 392 in ECO mode it'll behave a lot more more like the 5.7 and engage (over-engage, in my opinion) MDS. If you like the associated exhaust drone
Hey guys, Im new here and just made the jump from a 2017 R/T 5.7 to a 2018 R/T scatpak 392, both of which have MDS. What I noticed and am concerned about is that the 5.7 was much more MDS friendly, in the sense that it would engage as soon as it could and stay on for as long as possible. The 392 on the other hand rarely ever engages MDS, even when it does, all it takes is the slightest press on the throttle to disengage it. I know MDS isn’t a desirable feature for most people here, but I use my car as a daily driver and can benefit from even the smallest gains in fuel economy. My questions are:
1) Is this a sign of the MDS failing or is it normal?
2) How should I look out for now that I own a 392? (What are some common failures and problems with the engine or trans)
3) I’ve read on many places that the 6.4L is much more reliable compared to the 5.7L, is this true?
My vehicle is a salvage but was repaired to factory specs, it has 15K miles on it. Thank you!!
I have owned a 15 R/T and then a 16 scat. Mine did the same thing. I did not like the MDS kicking in
so easily on the 5.7. So I kept it in sport most of the time. I would let both motors engage the MDS
when on the interstate though.
Hey guys I know there are topics on this already but what I want to see 2015 Scat Pack challengers ONLY with stage one Mopar springs. I know Luke at Steve White Motors have done a couple of scat packs and claimed a total drop of APX 7/8" front and 1/2" rear which i believe is 29" front and 30...
Ok, I will probably post a bunch of newbie stuff as i go through my car....bare with me. Ok so I dont get why I need the skip shift eliminator. Somebody sell me on why!
I say this cause I have yet to experience any issues to need it. I dont skip gears myself ever. I run through the gears...
I have 2016 R/T with an extended warranty and I am trying to upgrade to a new Scat Pack. I was told by the dealer's warranty department that they do not give an extended warranty for Scat pack SRT or Hellcats, but I can purchase a service contract. So, I contacted Dodge warranty online...