Wish I'd known after installing the range dfm disabler that it still runs on zero cylinder during coast, finding myself still running in L9.........is it just me? Kinda feel like I wasted money........ Does anyone know how to kill that coast mode? I like the cackle of the exhaust I put on.
Hey guys, Jacob here, Brand Manager for Range Technology. We're sorry if you were confused over the capabilities of our new DFM Module for the Refresh applications. We tried to share the information about 0-cylinder mode in multiple places on our website. Sorry it wasn't clear for you.
While we have the ability to turn off the '0-cylinder' function with our module, when we were doing our internal testing, and then when we had external beta testers in the field. We had an overwhelming amount of response of the negative side effects in drivability by turning off this factory feature with our device. With that info, we opted to leave the 0-cylinder mode active when our product was installed. Our device is disabling your DFM system 100% of the time, but under decel with no throttle input, the vehicle will enter 0-cylinder mode, which isn't your DFM system at all. The ECM is actually cutting fuel to all 8-cylinders so there is no combustion, it is not collapsing the lifters like DFM does.
Turning off the 0-cylinder mode had a major effect on fuel economy (most users lost 2-3mpg), you lose your factory engine braking feature (big deal while towing or coming down a grade), and the signal can only be sent after specific circumstances are met. The downside here is that until this signal is sent, your DFM, Start/Stop and 0-cylinder modes will still function like stock. For more light on this, the vehicle must be driven anywhere from 30-seconds to 5-minutes, and once that criteria is met, you must surpass 40mph, once those two criteria are met the device can disable all three features. But again, you'd lose fuel mileage and engine braking. So, if you're only doing around town driving and never surpass 40-mph, your DFM still works... and on top of that, those two criteria must be met EVERY time you start the vehicle.
Knowing all of this, we opted to release our product without disabling 0-clyinder mode until our engineers found another avenue that wouldn't create the negative side effects. We opted to offer you DFM and Start/Stop Disable all the time...regardless of driving conditions and paramteres.