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 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?

Thanks!