Chrysler’s Multi-Displacement System (MDS) is an automobile engine variable displacement technology. It debuted in 2006 on the 5.7 L modern Hemi V8. … Unlike the system used on Mercedes-Benz V12 engines, also designed by Eberspaecher, the system is mechanically passive.
Is MDS bad for engine?
No, the MDS is not bad for your engine. The whole idea behind this system to actually to improve fuel efficiency. The only complaint about the MDS is that drivers can only use four cylinders instead of eight.
How does Dodge MDS work?
The MDS solenoids direct oil pressure to the lifters for each cylinder and that pressure pushes in locking pins that allow the lifters to ‘collapse’, so they no longer open the valves. The ECU also shuts off fuel and spark to the cylinders.
Can you disable MDS on Hemi?
MDS is a “multi-displacement system” that deactivates a cylinder bank on the Chrysler’s Hemi V8 engine to operate in four-cylinder mode for greater fuel efficiency. … You can disable this MDS system through a variety of means; from software reprogramming to hardware modifications.
What engines have MDS?
Chrysler first introduced the system in 2005 specifically for their 5.7L Hemi Engine though they have since expanded the lineup of vehicles with MDS to include:
- Chrysler 300C (2005)
- Dodge Charger (2005)
- Dodge Magnum (2005)
- Dodge Durango (2006)
- Ram 1500 (2006)
- Jeep Commander (2006)
- Chrysler Aspen (2007)
How do you know when MDS is working?
There is no display to tell you MDS is active or not, it’s all feel and sound. It is VERY easy to tell when it drops to 4 cylinders if you have a really loud exhaust, motor sounds completely different.
Do all Hemis have MDS?
All hemis in the 1500 built after 2006 have the MDS. The only exceptions to this is the mega cab which is a 2500 chassis and the non-mds HD engine.
What’s MDS on Dodge?
MDS stands for Multi Displacement System, which when at highway speed will shut down to use only four cylinders instead of all 8 to save on fuel consumption. When you step on the gas to climb a hill or pass another vehicle or just to hear that HEMI Roar, the other 4 cylinders will automatically kick back in.
Which Hemi engines have MDS?
The modern Hemi was released with 5.7L, 6.1L, and 6.4L displacements, all of which featured MDS. The latest 6.4L version had a maximum power of 525 horsepower.
Do Hellcats have MDS?
Hellcats do not have MDS. 6.4Ls and below do if they’re automatic. Only way a Hellcat is getting 30+mph is going down a mountain.
Does sport mode turn off MDS?
Sport mode does disable MDS.
How many miles will a 5.7 Hemi last?
5.7 Hemi engines are good for 250-300 000 miles and more if properly cared for and regular maintenance is carried out. Early models suffered from valve seat issues which was rectified after 2008. It’s not uncommon to find high mileage 5.7 Hemi trucks running around today.
Does tow haul turn off MDS?
You can manually choose 8th gear and it will turn off MDS. Tow/haul will not feel like a big difference like other vehicles. Since it is electronically controlled the change is more subtle. The biggest difference I feel is it downshift sooner.