DFM disabler released

[KMeloney]

Here you go, found something useful. Here's Carbyte actually explaining it. If you don't hit 40, DFM does it's thing. If you do hit 40 they claim it's completely disabled for that drive cycle. Generally speaking that's probably fine, just don't get fooled into thinking the DFM is completely disabled.

You should buy it and leave us your impressions. I'm certainly curious!

View attachment 442805 https://www.at4forum.com/threads/carbyte-dfm-disabler-for-2024-limited-giveaway.3482/page-6

I probably will buy it!

Does the Range require a speed be reached first?

 

[nick14226]

I probably will buy it!

Does the Range require a speed be reached first?

Not that I've noticed

 

[KMeloney]

Not that I've noticed

Interesting. So, it sounds like the trade-off between the two is needing to get up to 40mph vs cylinder drop out on coasting...?

 

[RG23RST]

Interesting. So, it sounds like the trade-off between the two is needing to get up to 40mph vs cylinder drop out on coasting...?

No. The engine "shutting off" under coasting and refiring at ~14mph has nothing to do with DFM. The solenoids aren't on and supplying oil to deactivate the lifters. It's Deceleration Fuel Cutoff that causes that phenomenon. It's simply cutting fuel to the engine when it's not needed to save fuel, protect the catalyst and extend engine/transmission life by not using engine braking when it's not necessary. You can use Tow Haul mode or manually shift if you need engine braking. Vehicles have operated like this for ages it's just particularly noticeable on these trucks/SUVs because of the more open exhaust than in years' past.

 

[Scarey]

At the risk of beating a dead horse…..My question is, is Dfm different than 0 cylinder while coasting? Dfm being selective cylinder deactivation, and 0 cylinder mode while coasting being the cylinders are still active but being starved of fuel.