Understanding Active & Dynamic Fuel Management and The Problems They Cause (AFM vs DFM)
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- čas přidán 4. 07. 2024
- In today’s video, Jake explores the world of Active Fuel Management (AFM) and its successor, Dynamic Fuel Management (DFM). AFM and DFM are technologies developed by GM to improve fuel efficiency by deactivating select cylinders during low-load driving conditions. This reduces fuel consumption by allowing the engine to operate more efficiently when full power is not required. However, are they as good as GM makes them sound? Jake covers the differences between AFM & DFM, the problems these systems can cause, and what route is best to delete or disable Active Fuel Management (AFM) or Dynamic Fuel Management (DFM). This is your go-to video for all things AFM & DFM.
Here is a link to Our AFM/DFM Disabler Device We Developed in the US:
Amazon Prime: www.amazon.com/dp/B0D1T1FMJK?...
Boost Website: boostafmdisabler.com
Also, if you would like to read up on this topic more, we have an article on our Chevy Trucks website:
chevytrucks.org/delete-or-dis...
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00:33 - What is Active Fuel Management & Dynamic Fuel Management?
01:39 - AFM vs DFM: What Are the Differences?
04:22 - Reliability Related Problems AFM & DFM Can Cause!
05:49 - Performance Related Problems AFM & DFM Can Cause!
07:06 - Delete or Disable AFM/DFM: Which is Better?
07:57 - How to Disable AFM/DFM
11:06 - How to Delete AFM/DFM - Auta a dopravní prostředky
Just bought one
For my 2022 Chevy with 8 speed transmission, I will check it and let you know about it
A - Thanks for the support! Keep us posted!
I use boost in my 15 Denali, absolutely great product that is cheaper than range. Thanks
A - Thanks for the support! We really appreciate it.
I have a 07 Silverado that has the full delete normal lifters changed cam shaft valley cover and my truck runs like a dream
D - The right way to do it, we just can't recommend it publicly!
Great Video.
Thanks! Glad you found it helpful
Will this work for a cadillac escalade?
When will the Boost AFM/DFM Disabler be available for 23-24 Sierra 1500 models?
R - We are working on it, but don't have any updates on this as of yet.
2021 GMC Sierra 6.2 Lifter failure at 22,000 miles.
G - So sorry to hear this.. Very sad what these "emissions" systems are doing to new vehicles.
Really??? I just bought a 21 GMC AT4. 6.2. With 59k miles. So far so good.
@@George-on3zm Keep up on Oil changes. I have heard that this helps the cause.
G - Absolutely.
How do we order this ? Have a 2018 lfiters failed and replaced and dont want it to happen again.
A - So sorry to hear! We have a link in the description, but here it is for ease: www.amazon.com/dp/B0D1T1FMJK?maas=maas_adg_2CDE464277A6404D470A623F0084F062_afap_abs&ref_=aa_maas&tag=maas
My brother-in-law has a 17 Sierra, cousin has an 18 Sierra and my dad has a 15 Silverado. Hardly any engine problems with the 3 of em combined.
T - Nice! Do they have any upgrades?
@@8020Media No, my dad's is a company truck. Only upgrade that was done was my cousin's tires. He's got bigger tires on his.
T - They must take great care of them! Thanks for sharing these.
Will the little afm devices work in 2006 gmc sierra 4.8?
M - Unfortunately, our device isn't compatible with your 06 Sierra.
I see the boost isnt shown as compatable for the 2023 / 24 Silverado 1500... Does it work for them also?
It does not currently work on 2022 refresh, 2023, or 2024 Silverado or Sierra's. We're working on one but aren't sure when it'll be ready yet!
@@8020Media Thanks! From your experience are there many issues with the 2022 refresh 2023 models? 6.2l. Cheers
G - It's honestly too early to tell.
The 3.6, V6 AFM is a double overhead cam engine and the afm is done in the rocker arms. They have been trouble free.
Yepp definitely less problematic than the others!
Had a 2021 suburban fail at 8k
J - Wow.. So sorry to hear this. Lifter failure?
Yep, took out the cam, and bent valves and push rods @8020Media
J - That's crazy... They definitely don't make them like they used to.
The camshaft also needs to be replaced anytime the AFM or DFM lifters. Also, GM has a newer DOD - Displacement On Demand - on newer cars & trucks which has several hundred or more ways to deactivate cylinders.
D - Think "several hundred or more ways" might be a stretch. Depending on what years you are referring to, there aren't very many solutions of deactivating these systems, unless you delete them.
@@8020Media Thank you for your comment.
Don't get me wrong, I love GM trucks but having a AFM, DOD or a DFM system on a truck to save 1-2 miles per gallon is just stupid on GM's part. Also, having a GDI system is stupid since Ford & other OEM's ran into a lot of problems with their GDI systems because excess carbon builds up on the intake valves. GM is probably going to have the same issues. Another stupid idea is the auto stop/start system because most engine wear occurs at start up since their is no oil pressure for a few seconds which over time will wear out the piston rings & increase cylinder wear.
First came the Active Fuel Management (AFM) which deactivated the same 4 cylinders which created hot & cold cylinders when in V4 mode. Then came the Displacement On Demand (DOD) which came on certain GM models. I can't remember how that system worked. Then the modern Dynamic Fuel Management (DFM) which GM states there are 17 different ways to deactivate certain cylinders from a V8 mode to a V4 mode to a V2 mode. On the AFM & DOD systems there are a lot of lifter, camshaft, & piston ring failures at low mileage. Statically speaking there are thousands of different combinations. Think of it as all the different number combinations while playing to lottery.
The 2 major problems to over come is heat retention of the deactivated cylinders & engine balance. If there was a way to restrict coolant flow around the deactivated cylinders & have a electronically controlled harmonic balancer so a odd number of cylinders could be deactivated would provide even more combinations of deactivating cylinders.
D - We don't disagree. Thanks for taking the time to share these insights!
You don’t make these for 2023-2024 Models with the 6.2?
L - Not currently, but this is something we are seriously looking into.
Look faster. 2023 5.3L here. Id like my V8 fulltime please.
L - lol, we wish it was that easy. But will keep you updated.
@@8020Mediai just got a 21 GMC AT4. 6.2. 59k miles. So far so good. Wonder if i should pusrchase this ?
Another '24 5.3 owner waiting for release of a compatible delete module.
Have a 21 GMC. With 6.2. So far so good.
G - Nice. How many miles do you have on it?
@@8020Media 60k
How many miles u have on it
G - Thanks for sharing your experience.
I bought a new 14 v-6 Silverado not knowing about the afm. I felt it kick in and knew it was not good for the engine. I only had to add a small amount of pedal to get it back to firing on all 6. I bought a afm delete that now prevents the afm from kicking in. It plugs into the port under the dash with no modifications. It does have a constant drain on the battery so for l/t storage just remove it. Well worth the $$$.
Yepp, that's the best way to do it. If you want a device with less drain, our Boost device only pulls 0.71mA of power while turned off. Range's device pulls up to 6mA and usually sits within 2-3mA so theirs drains battery way faster than ours does.
@@8020Media I will vouge for that.
B - Yep... That's why we took the time to make a competing device that's cheaper and addresses their faults!
What would have been simpler would have been if they just let the lifters work normally while shutting off fuel delivery to different cylinders as necessary. I imagine that with the valves closed while the piston is trying to induct and expel it builds pressure and forces the currently working cylinders to work harder to rotate the crankshaft thus defeating any fuel economy gain.
S - Well said. Thanks for sharing this insight.
@@8020Mediado u think i need this product on my 2021 2.7 turbo silverado??
Now you are just pumping air through the engine without using it i.e. engine braking. That would actually defeat the purpose. With the valves closed, the air in the cylinder acts as an air spring, recovering some of the compression losses.
S - Unfortunately, our product won't work on your vehicle.
does this work on my 2021 silverado 2.7 turbo
S - Unfortunately, no.