DFM disabler released

[Marky Dissod]

DFCO does NOT deactivate cylinders - or if you prefer, DFCO does not deactivate valves.
During DFCO (and powertrain braking), valves open and close normally,
like it's been done since the 50s, or whatevar.
It's merely FUEL that is not being used during DFCO.

I suppose DFCO could be combined with cylinder deactivation,
but wouldn't that be past the point of diminishing returns?
If you're already not injecting any fuel into any cylinders (DFCO),
you're already using zero fuel.
What additional benefit would there be to also deactivating the valves while ALREADY using zero fuel?

 

[KMeloney]

DFCO does NOT deactivate cylinders - or if you prefer, DFCO does not deactivate valves.
During DFCO (and powertrain braking), valves open and close normally,
like it's been done since the 50s, or whatevar.
It's merely FUEL that is not being used during DFCO.

I suppose DFCO could be combined with cylinder deactivation,
but wouldn't that be past the point of diminishing returns?
If you're already not injecting any fuel into any cylinders (DFCO),
you're already using zero fuel.
What additional benefit would there be to also deactivating the valves while ALREADY using zero fuel?

Just wanted to say that I learn a lot from your posts with your technical insight. Keep it up, please!

 

[Marky Dissod]

Just wanted to say that I learn a lot from your posts with your technical insight. Keep it up, please!

You'd be shocked at how much you learn from
tuning mid-90s LT1s
asking every question your tuner'll allow when he's tuning your GMT932.
Many of you who think you're against engine / transmission tuning,
would be for it if you understood what they're capable of.

(An answer to a question no one asked: my stance on cylinder (valve) deactivation has nuanced.
I'm still against it ... UNDER 221F {that's a coolant temp threshold}.
Me AND my 2013 YXL tuner know from experience that too much V4 mode increases oil consumption.
Cylinders that get even a wee lil bit too cold from taking too long a break increase oil consumption.
But that same cylinder deactivation can be used to delay or mitigate overheating.

So, instead of disabling cylinder deactivation, just raise the enable temp to 221F,
or 230F if you're braver than I am.)

 

[KMeloney]

my stance on cylinder (valve) deactivation has nuanced.

In light of the fact (I think) that I won't get this truck tuned (got my '01 Z06 tuned, but not this truck), do you recommend the Range disabler? And do you have an opinion on the Range unit vs the Carbyte unit?

Thanks!

 

[Scarey]

That’s what I’m trying to figure out. 2024 tahoe 6.2. I have the range 007 and have been playing with it. It’s not much trouble to install, floor jack a few inch’s and slide on your back from the nose and simply pry back the wheel well carpet and you can plug and unplug. So that’s not a big deal. Yes the obd port would be easier. Driving in L9 or driving with range appear to be identical. Both appear to be identicle in coasting, foot of the gas. Both show 99 on the instant mileage page. Both feel identical, sound identical, shift identical. This is why I’ve been asking so many question's about 0 cylinder mode coasting. People claim l9 completely disables Dfm. Coasting with range 007 feels like l9. So does that mean range does completely disable Dfm? If coasting truly is just starving the cylinder of fuel and not deactivating the valves with Dfm then range is what I’m looking for. If coasting is using Dfm then I’m not satisfied with range solution. Im not sure yet. I ordered a carbyte and will play with it. My curiosity has the better of me.

 

[Marky Dissod]

In light of the fact that (I think) that I won't get this truck tuned (got my '01 Z06 tuned, but not this truck),
do you recommend the Range disabler?
And do you have an opinion on the Range unit vs the Carbyte unit?

1stly, I recommend getting tuned.
However, I know that is getting not only more expensive, but logistically more difficult.
Pretty soon, even when you buy something brand new, it won't really be yours, which pisses me off.

2ndly, I recommend disabling cylinder (valve, really) deactivation generally.
Our engines would tend to last 200,000 miles or more given regular maintenance by any schmuckdiot.
Cylinder-valve deactivation has made 200,000 miles much more difficult and costly for the owner operator,
and only encourages further complexities by carmakers which will drive up future owner operator costs.

You gotta decide which fulltime V8 device suits your needs and wants,
but I like the ones that plug in under the dash, because I can remove or plug it in in two seconds.

 

[KMeloney]

That’s what I’m trying to figure out. 2024 tahoe 6.2. I have the range 007 and have been playing with it. It’s not much trouble to install, floor jack a few inch’s and slide on your back from the nose and simply pry back the wheel well carpet and you can plug and unplug. So that’s not a big deal. Yes the obd port would be easier. Driving in L9 or driving with range appear to be identical. Both appear to be identicle in coasting, foot of the gas. Both show 99 on the instant mileage page. Both feel identical, sound identical, shift identical. This is why I’ve been asking so many question's about 0 cylinder mode coasting. People claim l9 completely disables Dfm. Coasting with range 007 feels like l9. So does that mean range does completely disable Dfm? If coasting truly is just starving the cylinder of fuel and not deactivating the valves with Dfm then range is what I’m looking for. If coasting is using Dfm then I’m not satisfied with range solution. Im not sure yet. I ordered a carbyte and will play with it. My curiosity has the better of me.

Please let us know how the Carbyte compares to the Range, since you'll be able to do a direct comparison of your own. Very interested to hear your take on the two.

 

[KMeloney]

You gotta decide which fulltime V8 device suits your needs and wants,
but I like the ones that plug in under the dash, because I can remove or plug it in in two seconds.

Thanks. And given that I've got a '23 Denali with the 6.2, I'm a potential candidate for the engine seizing. And whereas I'm hoping I never have that situation occur, I wouldn't want someone to try to say that having the Range installed contributed to the failure.

 

[Scarey]

Hi Marky Dissod, are you using the carbyte device, satisfied?

 

[KMeloney]

Hi Marky Dissod, are you using the carbyte device, satisfied?

I don't think he's driving a '21+ truck...

 

[Marky Dissod]

I wouldn't want someone to try to say that having the Range installed contributed to the failure.

1. Why would you even care what 'someone' TRIES to say?
1b. Which 'someone' are you concerned with?
1c. What if they try to say something you don't like, but they fail?
1d. In case we don't make it to '2', this is why I'd prefer the Range - quick connect, quick disconnect ...
quick disavowal

2. How does it make ANY sense, that disabling Cylinder (Valve) Deactivation,
would make it more likely to cause a lifter failure?
So far as I know, disabling Cylinder (Valve) Deactivation has never caused a lifter failure.
So far as I know, disabling Cylinder (Valve) Deactivation makes lifter failure less likely, and delays lifter failure.

3. No, I am not using 'the carbyte' or 'the range'.
I can tell y'all that 'the Range' is typically preferred by NYC cabdrivers / chauffeurs.

 

[KMeloney]

1. Why would you even care what 'someone' TRIES to say?
1b. Which 'someone' are you concerned with?
1c. What if they try to say something you don't like, but they fail?
1d. In case we don't make it to '2', this is why I'd prefer the Range - quick connect, quick disconnect ...
quick disavowal

2. How does it make ANY sense, that disabling Cylinder (Valve) Deactivation,
would make it more likely to cause a lifter failure?
So far as I know, disabling Cylinder (Valve) Deactivation has never caused a lifter failure.
So far as I know, disabling Cylinder (Valve) Deactivation makes lifter failure less likely, and delays lifter failure.

3. No, I am not using 'the carbyte' or 'the range'.
I can tell y'all that 'the Range' is typically preferred by NYC cabdrivers / chauffeurs.

“Someone” AT THE DEALERSHIP. I wouldn’t care what anyone else might have to say on the matter — I just wouldn’t want the dealership to try to say that the unit somehow voided the warranty (and that they therefore wouldn’t replace the engine). That’s all I’m getting at.

…And, to be clear, the current Range for these trucks has to be installed under the truck, behind the wheel liner (and so it’s not necessarily a quick install/removal like the Carbyte is). If I had the Range installed and my truck crapped out on me, I likely wouldn’t be able to remove it before it made it to the dealership.

Personally, I’m just looking to get some insight into the “liability” angle the dealership might try to take if my truck were to shit the bed with the Range installed.

 

[ShelbiTahoe]

I was just looking on their website and saw it available too. Went ahead and ordered one. Hoping it works. Anyone got one and using it?

How did it work out? And which vehicle did you get it for? We have a 21 tahoe P

 

[Antonm]

See quick google AI search link for Magnuson-Moss warranty act of 1975 below.

Google Search

www.google.com

key point bold and underlined below;

• Protections
  The law makes it illegal for:
  • • Dealerships to deny warranty claims if a vehicle is serviced at an independent shop
    • Manufacturers to claim that a warranty is void or to deny coverage if someone other than the dealer did the work
    • Manufacturers to condition consumer warranties on the use of any original equipment part or service
    • Warrantors to void warranties on modified vehicles unless they can prove the aftermarket or recycled part caused the failure ...

 

[Scarey]

I bought a new 2002 tahoe shorly after 9/11. Best car/truck I’ve ever owned. Couple months ago I decided to replace it and bought a new 2024 tahoe 6.2. I was not aware of Dfm, never heard of it, not listed on the window sticker like some have said. Interestingly the auto stop/start is on the sticker. I like the truck, hate the Dfm. A complication that shouldn’t be on a normally aspirated V8. Would I have bought the truck had I known about it, maybe not. As I researched Dfm, Range came out with a disabler, the 007. Bought one and have been playing with it. The auto stop start is disabled but Dfm is only kind of. The biggest failure is the coasting mode. Dfm activates when you take your foot off the gas. Interesting in L9 Dfm still activates in coasting/0 cylinder mode. I know some people say L9 deactivates Dfm, not on mine. Purchased the Carbyte to see if it worked any better, and it does. Very early in my playing with it but clearly it does defeat Dfm in coasting mode. You do have to hit the 40 mph threshold for it to activate. The auto stop/start is defeated immediately. So until you hit 40 mph both the range 007 and carbyte work the same. After 40 mph the carbyte is the clear winner. It does coast longer, not the same deceleration rate as when Dfm kicks in but I think that can be an advantage, mpg, if you’re anticipating the rate of deceleration, be aware. My two cents.

 

[14point5]

I bought a new 2002 tahoe shorly after 9/11. Best car/truck I’ve ever owned. Couple months ago I decided to replace it and bought a new 2024 tahoe 6.2. I was not aware of Dfm, never heard of it, not listed on the window sticker like some have said. Interestingly the auto stop/start is on the sticker. I like the truck, hate the Dfm. A complication that shouldn’t be on a normally aspirated V8. Would I have bought the truck had I known about it, maybe not. As I researched Dfm, Range came out with a disabler, the 007. Bought one and have been playing with it. The auto stop start is disabled but Dfm is only kind of. The biggest failure is the coasting mode. Dfm activates when you take your foot off the gas. Interesting in L9 Dfm still activates in coasting/0 cylinder mode. I know some people say L9 deactivates Dfm, not on mine. Purchased the Carbyte to see if it worked any better, and it does. Very early in my playing with it but clearly it does defeat Dfm in coasting mode. You do have to hit the 40 mph threshold for it to activate. The auto stop/start is defeated immediately. So until you hit 40 mph both the range 007 and carbyte work the same. After 40 mph the carbyte is the clear winner. It does coast longer, not the same deceleration rate as when Dfm kicks in but I think that can be an advantage, mpg, if you’re anticipating the rate of deceleration, be aware. My two cents.

I have both (Range 007 and Carbyte) and my experience with our 2024 Tahoe matches your conclusions. I bought the Range when it was first released, pulled it and have the Carbyte in just for a couple weeks now.

 

[nick14226]

Great info guys…. I might have to try the carbyte myself and do the comparison. I never noticed DFM doing its thing before hitting 40 with the range, but I don’t think that happens very often, I’m over 40 out of the gate pretty much everywhere I go.

 

[Scarey]

Further playing with the carbyte device I have to give credit to Range. According to the note on their web site, when you go into zero cylinder Dfm coasting it slows as expected but with Dfm defeated it does not slow much, I mentioned that earlier. I’m in a modertly hilly area and when I drive down some of the hills with Dfm active, I control my descent by down shifting. With Dfm defeated I’m going down two or three gears more and rpm’s are continuing to climb along with the speed. I would seriously consider turning the device off or removing it if pulling even a moderate trailer load.

 

[KMeloney]

With Dfm defeated I’m going down two or three gears more and rpm’s are continuing to climb along with the speed. I would seriously consider turning the device off or removing it if pulling even a moderate trailer load.

Really appreciate your feedback, but I’m not following you with this part. If your RPMs increase going down hills, doesn’t that mean that the transmission is downshifting and the engine is providing braking? (If so, you’d want that when towing a load, no?) Hoping you can clarify this for me. Thanks.

 

[djensen9367]

I had the Carbyte unit for a couple of weeks and it worked great BUT it would not work with an OBD splitter and my Scan Guage 3. I prefer not to give up my scan guage as it gives a lot of information especially shows what gear i am running in. It is not that hard to run L9 and I already took care of auto start. I did check with scan guage and they could not see why it didn't work but no solutions from either company. So just an FYI if you use a splitter