MDS Delete discussion Scott Blum

Offroad+ effect on MDS has been discussed so many times. Seems to be widely accepted, from what most owners have experienced, is that most late 2022 and newer year Wrangler 392 will disengage MDS when Offroad+ mode is engaged, or in Manual Shift Mode either by paddle shifters or gear selector.
There does seem to be a few exceptions, for some unknown reason. And has nothing to do with XR or non-XR.
 
My 2021, definitely did not disable the MDS in OR+, somewhere I have a picture to prove it.

Where it gets weird, is that I swear, my 2023 20a went into MDS 4cyl mode while in OR+, but I do not have a picture to prove it, so maybe I was completely crazy.

But now, after 17k miles, it will not activate MDS while in OR+ for sure.

I'm wondering if maybe the MDS activates during a number of miles at first to assist with breaking in those components, but after a few thousand miles it stops doing it.
 
Robr651 said:
Seems that folks with 23’ and newer models have reported it being disabled in Off Road + earlier ones not so much.
Click to expand...
My 2022XR will NOT go into 4cyl mode no matter how gently I apply the pedal or at slow cruising speed. This discussion has been going on in this forum for as long as I can remember and no one seems to have ever figured out why some 392's will go into 4cyl mode in offroad+ and some do not.
 
guruman said:
My 2021, definitely did not disable the MDS in OR+, somewhere I have a picture to prove it.

Where it gets weird, is that I swear, my 2023 20a went into MDS 4cyl mode while in OR+, but I do not have a picture to prove it, so maybe I was completely crazy.

But now, after 17k miles, it will not activate MDS while in OR+ for sure.

I'm wondering if maybe the MDS activates during a number of miles at first to assist with breaking in those components, but after a few thousand miles it stops doing it.
Click to expand...
My 2023 20A only has 685 miles to date since July 2023 (New) and to the best of my knowledge and thorough observation throughout the entire break in process it has never dropped into the MDS 4 Cyl while its in the Off Road +
 
Electrified said:
My 2022XR will NOT go into 4cyl mode no matter how gently I apply the pedal or at slow cruising speed. This discussion has been going on in this forum for as long as I can remember and no one seems to have ever figured out why some 392's will go into 4cyl mode in offroad+ and some do not.
Click to expand...
My 22XR DOES NOT go into 4cyl mode in OF+. I've tried it numerous times and never had a condition where I could get it into 4cyl, no matter how slow or smooth I drive in OF+. I can make it go into 4cyl immediately otherwise. Scott Blum said that 23XRs and newer models definitely do not go into MDS in OF+.

Every post I've seen of people saying theirs go into 4cyl in OF+ is a '21 non-XR.
 
Uncommon Sense said:
My 22XR DOES NOT go into 4cyl mode in OF+. I've tried it numerous times and never had a condition where I could get it into 4cyl, no matter how slow or smooth I drive in OF+. I can make it go into 4cyl immediately otherwise. Scott Blum said that 23XRs and newer models definitely do not go into MDS in OF+.

Every post I've seen of people saying theirs go into 4cyl in OF+ is a '21 non-XR.
Click to expand...
Except for @LTZ470 from a few images back :p
 
So I will just post this and get out of this thread because I have truly never noticed MDS on any one my Hemi vehicles.

All the people that say the XR 2022+ doesn’t use MDS in OR+, what is controlling that? Some specific programming? A mechanical difference? So if that difference does exist, what is the manufacturer motivation to have such a minute difference in the programming for a couple thousand vehicles? Every special thing they do cost $$$. Special install instructions at the factory, special maintenance instruction, special recall and flash instructions, special versions of the software, special testing of programming changes…. Everyone says Stellantis is stupid and bad customer service and low quality Yada yada yada. This gives them a lot of credit that they found this tiny thing that is a tweak that needs to be there and if a non XR comes in then the flash update is different. No possible way…. Next time you see something for your 392, take a look to see if there is a different part number/tsb/procedure/manual for a 392 vs 392 with the XR tire package. There is no difference…

I am going chalk it up to some conditions/upgrades/driving styles differ enough to have it come on for some people more than for others. I average 20mpg on my 392 pretty much since day 1…. Am I gonna say that is because some programming? Ah no…. I have lightweight 35s 3.73 ratio and rarely use or+ on-road.

That is all I got. I am out of this thread.
 
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Guess I’ll join in, with my October ‘21 XR build. I originally installed a Pedal Commander within a week of ownership, but swapped to a Pedal Monster after a year(…due to the former causing limp mode). I don’t know if the throttle controllers play a part, but my late ‘21 XR definitely DOES NOT go into 4cyl mode while in OR+.
:cool:
 
This OffRoad+ / MDS thing has me saying this: My hobby is pinball machines. Over the course of decades there have been many pinball machine manufacturers putting out several different models per year. We pinheads have found in the surviving games some interesting variations within a given model and while the reasons for these variations are unknown to us, they all seem to come from the factory and are not after-factory mods.

Well, we are as deeply involved with pinball machines as the Jeep community is with Jeeps.

Jeeps have a unique VIN. Pinball machines have a unique serial number. We have created an online database where people submit to this database the serial number of the pinball game they own or of a game they have seen on location. This identifies the surviving games but it also allows the submitter to identify for that game which way the factory variation is for that game.

The results can be quite surprising and interesting.

Perhaps someone can host a list of vehicles having MDS where submitters could submit, say, the last six digits of their VIN, and then the year, the trim, or whatever, and importantly if their OffRoad+ allows them MDS or not.

I kinda think no one here would be that interested to find out about interactivity between OffRoad+ and MDS. However, it's an idea that could pick up speed and take off in the Jeep hobby for any variations, just as it has been of value in the pinball hobby.

Even if only a fraction of the thousands of MDS vehicles got submitted, you might find a point in time where the manufacturer made a change, where all/most VINs falling prior to that point in time were one way and all/most falling after that point in time were another way.
 
LTZ470 said:
Offroad+ doe not disable MDS...
Click to expand...
Off-road plus does disable MDS on my 2022 extreme recon, but I am running a taser also and I'm not sure which one is doing it. I will check next time I unmarry the taser. Traction control, and cruise control of any sort are not available for me when an off-road plus. I hate the exhaust sound when the vehicle goes into a four-cylinder mode so I like driving with the off-road plus occasionally. I do notice that the shift points change when moved in the off-road plus mode and fuel mileage. It's a bit worse.
 
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Cali392JL said:
Off-road plus does disable MDS on my 2022 extreme recon, but I am running a taser also and I'm not sure which one is doing yet. I will check next time I unmarry the taser. Traction control, and cruise control of any sort are not available for me when an off-road plus. I hate the exhaust sound when the vehicle goes into a four-cylinder mode so I like driving with the off-road plus occasionally. I do notice that the shift points change when moved in the off-road plus mode and fuel mileage. It's a bit worse.
Click to expand...

Not Tazer controlled.

Only down side for daily driving is, holds gears too long, rpms can get high for normal driving. Great for aggressive driving.
 
Taking this discussion a little sideways...
Is anyone aware of a device or feature that will disable MDS, other than OR+?
 
stumblinhorse said:
So I will just post this and get out of this thread because I have truly never noticed MDS on any one my Hemi vehicles.

All the people that say the XR 2022+ doesn’t use MDS in OR+, what is controlling that? Some specific programming? A mechanical difference? So if that difference does exist, what is the manufacturer motivation to have such a minute difference in the programming for a couple thousand vehicles? Every special thing they do cost $$$. Special install instructions at the factory, special maintenance instruction, special recall and flash instructions, special versions of the software, special testing of programming changes…. Everyone says Stellantis is stupid and bad customer service and low quality Yada yada yada. This gives them a lot of credit that they found this tiny thing that is a tweak that needs to be there and if a non XR comes in then the flash update is different. No possible way…. Next time you see something for your 392, take a look to see if there is a different part number/tsb/procedure/manual for a 392 vs 392 with the XR tire package. There is no difference…

I am going chalk it up to some conditions/upgrades/driving styles differ enough to have it come on for some people more than for others. I average 20mpg on my 392 pretty much since day 1…. Am I gonna say that is because some programming? Ah no…. I have lightweight 35s 3.73 ratio and rarely use or+ on-road.

That is all I got. I am out of this thread.
Click to expand...
My 2 cents:
The 392 engine used in the wrangler has been manufactured with the mechanical ability to run in MDS mode(only 4 cylinders firing). It uses a computer controlled input to activate. Therefore, in theory, there can be no problem with engine running in either mode. Limiting the computer’s activation of MDS with Offroad +, Diablo engine tuner, or whatever other device shouldn’t hurt the engine.

I was told that the ecu has to be hacked to override this function. However, if it was programmed into stock ecu , then functions like the offroad + should do it.
 
Zoomie86 said:
My 2 cents:
The 392 engine used in the wrangler has been manufactured with the mechanical ability to run in MDS mode(only 4 cylinders firing). It uses a computer controlled input to activate. Therefore, in theory, there can be no problem with engine running in either mode. Limiting the computer’s activation of MDS with Offroad +, Diablo engine tuner, or whatever other device shouldn’t hurt the engine.

I was told that the ecu has to be hacked to override this function. However, if it was programmed into stock ecu , then functions like the offroad + should do it.
Click to expand...
The no limitz product from Z Automotive I linked above is a plug and play, pretty easy install and is hidden from dealer scans if turned off properly. One of its features is the disabling of MDS.
 
Zoomie86 said:
My 2 cents:
The 392 engine used in the wrangler has been manufactured with the mechanical ability to run in MDS mode(only 4 cylinders firing). It uses a computer controlled input to activate. Therefore, in theory, there can be no problem with engine running in either mode. Limiting the computer’s activation of MDS with Offroad +, Diablo engine tuner, or whatever other device shouldn’t hurt the engine.

I was told that the ecu has to be hacked to override this function. However, if it was programmed into stock ecu , then functions like the offroad + should do it.
Click to expand...
Yes. The MDS solenoid is a on/off switch for the oiling. So, MDS in the off position is where most people drive the 392's. Since Z automotive figured out a way to, i think cut the power to the MDS signal instead of going through the PCM. Most but not all other places, I believe have Stellantis automotive software, they pay for, to unlock the PCM. Some, I suppose might hack into it. I wish I could get the software, so I can go in and adjust my Jeep how I want.
 
No Limitz JL is a breakthrough design to allow full output and security without any permanent modifications

  • Disables factory speed limiter (stay within limits of your tire rating)
  • Disables speed and torque limiters in 4 low
  • Disables torque management system/traction control
  • Disables MDS system (392)
  • Allows FULL POWER in 2WD on 4XE
  • Completely blocks access to the RF Hub, which prevents key programming
  • Can be turned on and off at any time
  • Simple plug and play installation
  • Silently overrides speed limiters and torque management
  • No permanent modifications
  • Nothing in the vehicle gets reprogrammed
  • Cannot be detected by dealer tools
 

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