DFM disabler released

[KMeloney]

I’ll turn off auto stop manually and run it in L9 moving forward.

You going to consider the Carbyte instead?

 

[23Seven]

@23Seven thats really strange. Mine has been flawless since installation. No errors. No CELs. Just smooth V8.

That’s how my afm in my Vette worked. What year is your Rig?

 

[23Seven]

You going to consider the Carbyte instead?

I’ll run the L9 for now. I’ll see how that works and sounds after I get my Flowmaster 40 installed on 1/6/25.

Carbyte would be another option I’m still considering.

 

[23Seven]

Some solid lifters, a nice cam, and the ecm from my 03 Silverado would make for a setup that could easily clock 300k miles. Chevy should have stayed away from the deactivation trash. I’ll keep a warranty on it and keep my fingers crossed while I keep fresh, clean oil in it.

 

[fondupot]

That’s how my afm in my Vette worked. What year is your Rig?

2021 5.3L L84

 

[DontTaseMeBro]

So Range is out. Is Carbyte still a go to buy?

 

[djnice]

I don't understand why the range is out. Sounds like testing has shown it disables DFM all the time. The whole thing about 0 cylinder mode looks like it was made up or misunderstood. There is no such thing. Why would they close all valves when the fuel is already shut off. Seems 0 cylinder just means the fuel is shut off while valves operate normally. If carbyte really disables fuel shut off that would be a bad feature that would make you have to brake more when slowing down, which is what some people claim it does. Sounds like range is better.

 

[Antonm]

The range unit also collapses all the lifters during zero cylinder mode,,, which the one thing most people wanted is to just stop the lifters from ever collapsing.
One can argue semantics that zero cylinder lifter deactivation is not part of DFM and is a completely separate thing,,, sure, whatever, alright.

But there will still be times the PCM commands the lifters to collapse/ de-activate the cylinders with the range unit installed. Holley/ Sentinel Capital partners now have a disqualifying statement on their website, below is a copy/paste of this disclaimer from their website (this little disclaimer was not there when they first started selling these BTW)

https://www.rangetechnology.com/products/dfm_module/

NOTE: Some vehicles may still engage 0-cylinder mode while coasting with this product installed. During extensive testing, it was found that completely disabling this function led to undesirable driving conditions and safety concerns. Disabling 0-cylinder mode while coasting resulted in a notable decrease in fuel efficiency, with a loss of 2-3 MPG, as the engine continues to fuel and fire the injectors even during coasting. This fueling also creates an unsettling sensation during deceleration, as it feels like the vehicle is still accelerating slightly, despite 0% throttle input. This requires harder braking, especially in scenarios like towing or descending a long grade, leading to undesirable driving conditions.

So long story short, Holley/ Sentinel Capital partners knew they weren't delivering what they claimed and did so intentionally. Most likely because they assume most of their customer don't know what they want and will be upset if they actually got what they asked for,,, which is all cylinders all the time, because in their opinion, that would cause "undesirable driving conditions".

Holley is no longer an automotive performance company, its now Sentinel Capital partners, so the business model has shifted from making aftermarket automotive performance parts, to making money for the stock holders.
...

 

[fondupot]

The range unit also collapses all the lifters during zero cylinder mode,,, which the one thing most people wanted is to just stop the lifters from ever collapsing.
One can argue semantics that zero cylinder lifter deactivation is not part of DFM and is a completely separate thing,,, sure, whatever, alright.

But there will still be times the PCM commands the lifters to collapse/ de-activate the cylinders with the range unit installed. Holley/ Sentinel Capital partners now have a disqualifying statement on their website, below is a copy/paste of this disclaimer from their website (this little disclaimer was not there when they first started selling these BTW)

https://www.rangetechnology.com/products/dfm_module/

NOTE: Some vehicles may still engage 0-cylinder mode while coasting with this product installed. During extensive testing, it was found that completely disabling this function led to undesirable driving conditions and safety concerns. Disabling 0-cylinder mode while coasting resulted in a notable decrease in fuel efficiency, with a loss of 2-3 MPG, as the engine continues to fuel and fire the injectors even during coasting. This fueling also creates an unsettling sensation during deceleration, as it feels like the vehicle is still accelerating slightly, despite 0% throttle input. This requires harder braking, especially in scenarios like towing or descending a long grade, leading to undesirable driving conditions.

So long story short, Holley/ Sentinel Capital partners knew they weren't delivering what they claimed and did so intentionally. Most likely because they assume most of their customer don't know what they want and will be upset if they actually got what they asked for,,, which is all cylinders all the time, because in their opinion, that would cause "undesirable driving conditions".

Holley is no longer an automotive performance company, its now Sentinel Capital partners, so the business model has shifted from making aftermarket automotive performance parts, to making money for the stock holders.
...

My scanner says otherwise. DFM does not activate anymore ever. Not once.

 

[Marky Dissod]

My scanner says otherwise. DFM does not activate anymore ever. Not once.

https://www.rangetechnology.com/products/dfm_module/

NOTE: Some vehicles may still engage 0-cylinder mode while coasting with this product installed.

NOTE: Apparently your vehicle is not 'some vehicles'.
'Some vehicles' cannot speak for 'all vehicles'.