DFM disabler released

[Antonm]

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

Guess that's why the Range disclaimer statement (full disclaimer statement copy/pasted from their website in my post above) says "Some vehicles"

Not sure what differentiates "some vehicles" from others, but my High Country and a video I saw of one an an Escalade, both of those were "some vehicle" and the lifters do collapse on zero cylinder.

I wonder if its a 6.2 vs. 5.3 thing? Your truck where the scanner says otherwise, is it a 5.3 or 6.2?

...

 

[fondupot]

Guess that's why the Range disclaimer statement (full disclaimer statement copy/pasted from their website in my post above) says "Some vehicles"

Not sure what differentiates "some vehicles" from others, but my High Country and a video I saw of one an an Escalade, both of those were "some vehicle" and the lifters do collapse on zero cylinder.

I wonder if its a 6.2 vs. 5.3 thing? Your truck where the scanner says otherwise, is it a 5.3 or 6.2?

...

How do you know? Just by sound? I can hear 0-cylinder mode subtly with my stock exhaust on my 5.3. But the scanner is not showing any DFM being activated. Its just the fuel being shut off to the cylinder.

I'm not gonna argue it anymore in these threads, people can make their own decisions, but my experience with the Range unit in my 2021 Yukon 5.3 has been great. Makes the truck so much better to drive.

 

[Scarey]

Both range and carbyte confirm that during 0 cylinder coasting, the valves remain closed via the collapsible lifters. Range emphasizes this is not Dfm, I’m assuming this means the Dfm program is not commanding the lifters in coast mode, something else is. I wonder if this is why fondupot doesn’t show the lifters are keeping the valves closed, because Dfm hasn’t commanded it. Not sure what the scan tool looks at.
I wish there was a gm insider who was intimately familiar with Dfm logic and collapsible lifter use and trigger. I wish range or carbyte would jump in, they should know what is triggered by what.

 

[Marky Dissod]

Now that GM is making these ecms far more confounding to 'crack', and more complicated to tune once cracked,
it is very likely that Range and CarByte do not have a full understanding of every possible parameter or combo of parameters responsible for triggering which possible types of cylinder valve deactivation.

GM obviously decided, in some cases, better to keep the engine coupled to the geartrain and trap air in all cylinders,
than to not use this 'feature' and 'go into neutral' until the driver touched the go-pedal again,
likely because of the very reason Range cited - a consistently measurable MpG penalty.

Hey, at least it works for 'some vehicles', but it still sucks that it does not work for ALL.
It'd be interesting if, in the near future,
the vehicles that insist on 'V-naughty mode' are penalized in the used car market for their obstinacy,
while those that allow total disablement of this feature do slightly better in the used car market.

 

[DontTaseMeBro]

A question of those who have the Carbyte. Does the app show when DFM is disabled real time? Cause I really want to know if it’s working. As mentioned before, prior to installing mine, I could not tell when DFM would kick on in my 2022 Yukon w/6.2 leading me to wonder if it was disabled from the factory(window sticker makes no mention)?

 

[Scarey]

Now that GM is making these ecms far more confounding to 'crack', and more complicated to tune once cracked,
it is very likely that Range and CarByte do not have a full understanding of every possible parameter or combo of parameters responsible for triggering which possible types of cylinder valve deactivation.

I agree complety.


I have both range and carbyte. The Dfm deactivation of both products is well worth the purchase. I find I’m leaning more to range, I do like the higher rate of deceleration with it. Still activating the collapsing lifters but not as much. Maybe that’ll help get me through the life of the rig without failure?

 

[Marky Dissod]

I have both range and carbyte. The DFM deactivation of both products is well worth the purchase.

Not like it used to be - on top of inflation, you don't even get what you used to get without a longwinded disclaimer after the asterisk.

I find I’m leaning more to range, I do like the higher rate of deceleration with it.
Still activating the collapsing lifters but not as much. Maybe that’ll help get me through the life of the rig without failure?

Define 'maybe', then define 'get me through', then define 'the life of the rig' ... think we all know what 'that' and 'failure' means ...

Best bet to both extend 'the life of the rig', and delay 'failure' -
delay it long enough, you might even get away with calling it a non-failure and selling it to the person whom it will fail -
is to change oil every 5000 miles OR LESS.

 

[PPV_2018]

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

Actually I believe you, but for the sake of objectivity you had mentioned something earlier about maybe posting some screencaps of the scanner data.. is this still a possibility? So for the believers and nonbelievers alike, It would be great undisputable evidence of the Range’s ability to totally disable DFM.

At that point, the next mystery would be to figure out what constitutes “some vehicles”… possibly cryptic language suggesting 5.3 get full DFM disable but the 6.2 don’t.. dunno… verdict’s still out on that part……

 

[fondupot]

Actually I believe you, but for the sake of objectivity you had mentioned something earlier about maybe posting some screencaps of the scanner data.. is this still a possibility? So for the believers and nonbelievers alike, It would be great undisputable evidence of the Range’s ability to totally disable DFM.

At that point, the next mystery would be to figure out what constitutes “some vehicles”… possibly cryptic language suggesting 5.3 get full DFM disable but the 6.2 don’t.. dunno… verdict’s still out on that part……

Yea, I'm trying to get around to it. Between the holidays, an 8 month old, a pregnant wife, full time job that requires travel and a part time YouTube channel host job, household repairs and projects...I tend to get a little bogged down.

 

[djnice]

Now that GM is making these ecms far more confounding to 'crack', and more complicated to tune once cracked,
it is very likely that Range and CarByte do not have a full understanding of every possible parameter or combo of parameters responsible for triggering which possible types of cylinder valve deactivation.

I agree complety.


I have both range and carbyte. The Dfm deactivation of both products is well worth the purchase. I find I’m leaning more to range, I do like the higher rate of deceleration with it. Still activating the collapsing lifters but not as much. Maybe that’ll help get me through the life of the rig without failure?

I found more interesting info. Tula skip fire does close valves under deceleration, which they refer to cylinder deactivation or deceleration cylinder cut off (DCCO). The closed cylinders actually reduce engine braking. So if range has more engine braking then it is probably keeping more cylinders active then carbyte. Unless carbyte is not cutting fuel, which is unlikely. Cutting fuel is deceleration fuel cut off (DCFO) that has been brought up before.

The closed cylinder acts like a spring bouncing up and down with less braking then the normal valve operation which pumps air. The problem with pumping air during DFCO is the cat gets too cool. So they have to fuel and fire cylinders or go into DCCO operation which doesn't pump air.

Just because Tula has this logic control, we don't know what part of Tula's skip fire GM is implementing. Maybe 5.3 doesn't use DCCO but 6.2 does because somehow the bigger engine gets the same mpg rating.

Its also more correct to call this DCCO. Its not really 0 cylinders constantly. The controller will choose any number of cylinders to deactivate.