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.

 

[KMeloney]

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.

Thanks.

Well, I'm very interested in something that plugs in under the dash, but not in something that requires a speed of 40 mph before it engages. I can't reach that speed in my town, so I won't realize the benefits of the Carbyte most of the time. Dang.

 

[Scarey]

Range 007 still allows 0 cylinder mode while coasting, has nothing to do with Dfm. Does carbyte also allow 0 cylinder mode while coasting even after reaching the 40 mph threshold required to deactivate Dfm?

 

[KMeloney]

Range 007 still allows 0 cylinder mode while coasting, has nothing to do with Dfm. Does carbyte also allow 0 cylinder mode while coasting even after reaching the 40 mph threshold required to deactivate Dfm?

This is par of what the Carbyte rep said in the Reddit thread I posted earlier:

"You have a right to be skeptical: it was no easy feat to accomplish what the Range engineers told you was impossible. Hard as it may be to believe, our engineering team indeed found a way to code around the zero throttle DFM activation. Carbyte works perfectly on my ‘23 Silverado with a 6.2L EcoTec and 10-speed transmission, as well as every other 6.2L truck."

Personally, I'm not 100% sure that that answers your question -- but maybe you know whether it does.

 

[Scarey]

Thanks for that answer. So it sounds like 0 cylinder coasting does have something to do with Dfm. That’s what I’ve been trying to figure out, dfm and 0 cylinder mode coasting are related.
My next question is, does dfm deactivation coasting have a down side like maybe putting un burnt fuel in through exhaust and catalytic converter?

 

[Scarey]

Or not fueling a deactivated cylinder part of carbytes solve?