2014+ AFM (Active Fuel Management)

3tspapat · January 25, 2019

I've been driving in L7 unless I get on the highway, only then will I shift to L8 so AFM can take over. Also in L auto start/stop won't kick in.

I have a few tanks logged with this style and with the colder temps. Will drive the next tank in "D" with AFM and start stop and see how much of a difference that makes.

UGAuChev17 · January 26, 2019

My guess is negligible. I have 20K on my truck. Half with AFM and half with AFM deleted. My mileage is the same without it and I added a CAI, exhaust and tune, which only gives me a little more of a lead foot.

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UGAuChev17 · January 26, 2019

My guess is negligible. I have 20K on my truck. Half with AFM and half with AFM deleted. My mileage is the same without it and I added a CAI, exhaust and tune, which only gives me a little more of a lead foot.

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3tspapat · January 29, 2019

Logged my morning work commute the past 2 days with same route (10 miles one way), traffic, driving and environmental conditions. It's city driving but about 1/3 of the way the limit is 60 MPH. Max speed is 60 MPH, average is 24 MPH. Driving style is for gas economy (Shifts mostly at 2000 RPM, never exceeding 2500 RPM).

1/28/19 - air temp 55 - Driving in L7 mode so start/stop and AFM disabled - 15.1 MPG
1/29/19 - air temp 55 - Driving in L8 mode so start/stop disabled and AFM active - 19.1 MPG
1/29/19 - air temp 72 -Driving in D with start/stop and AFM active - 23.0 MPG
1/30/19 - air temp 58 - Driving in D with both start/stop and AFM active - 21.5 MPG

Also noted decreases in AAPM, FPM, SCPM and MFPM for my vehicle but increased values for other commuters

Edited January 30, 2019 by 3tspapat

F4Gary · January 30, 2019

On 1/23/2019 at 11:56 PM, joshuaandrew14 said:

I feel the AFM switch from V4 to V8 every time it does it. Also, I'd imagine it's because of AFM, but my truck has kind of a rough idle and smells like it runs rich! WTF?

I don't believe this for a second. You can hear V4 mode, but you can't feel it go in and out.

KARNUT · January 30, 2019

You hear it in the exhaust. My brother in laws Ram, the only way you know it's in V-4 is the dash light and exhaust sound, My GMC was the same way

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SS502 · January 30, 2019

I can't feel it (although I am rarely in Drive, usually L7) but I can hear it with the Borla ATAK...with the stock exhaust, I could not even tell without seeing the indicator in the cluster.

joshuaandrew14 · January 30, 2019

I don't believe this for a second. You can hear V4 mode, but you can't feel it go in and out.

Do you want to come drive my truck? It’s noticeable every time. Why would I lie to guys on a forum about this? Lol.

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KARNUT · January 30, 2019

Some you can feel, my daughters Honda you can feel the switch. My father in laws you can't . The exhaust quiet you don't hear it. Louder exhaust you'll hear it.

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SS502 · January 30, 2019

1 hour ago, joshuaandrew14 said:

Do you want to come drive my truck? It’s noticeable every time. Why would I lie to guys on a forum about this? Lol.

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I believe you and was just relaying my truck’s tendency’s ? but I’d love to drive your truck ?

3tspapat · January 30, 2019

My wife always says she can feel it going in and out....HAAHHAAH

No i'm not off topic...

I can actually feel it kick on and off in my truck with the Borla. I can even hear some flutter.

Back with the stock set up, I could not hear the difference but can still feel the difference.

On our old Honda odyssey, one could not tell or hear the difference at all.

SS502 · January 30, 2019

30 minutes ago, 3tspapat said:

My wife always says she can feel it going in and out....HAAHHAAH

No i'm not off topic...

I can actually feel it kick on and off in my truck with the Borla. I can even hear some flutter.

Back with the stock set up, I could not hear the difference but can still feel the difference.

On our old Honda odyssey, one could not tell or hear the difference at all.

Well I like the way you started the post lol I’m guessing like everything else on these trucks it’s hit or miss. Some have transmission shudders, some can’t get a drivers side grab handle to fit right. I have the 6.2 if that matters but I can definitely hear the switching but again, I’m rarely in Drive.

AtlasFBG2 · February 1, 2019

On 1/30/2019 at 3:13 PM, F4Gary said:

I don't believe this for a second. You can hear V4 mode, but you can't feel it go in and out.

On my 4.3 v6 when it went into v4 mode it could be felt. There was a vibration mainly around 35 mph and 50 mph.

I believe the cause of the vibration in v4 was the flapper valve. After changing to a MBRP exhaust the vibration is gone and v4 mode can not be felt anymore.

ftwhite · February 1, 2019

Can't feel or hear mine. Have to look.
2018 6.2L with MagnaFlow muffler, with factory resonator.
Flapper removed.
No CAI.
Blackbear AFM tune.

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3tspapat · February 1, 2019

3 hours ago, ftwhite said:

Can't feel or hear mine. Have to look.
2018 6.2L with MagnaFlow muffler, with factory resonator.
Flapper removed.
No CAI.
Blackbear AFM tune.

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I think I know the reason why you can't hear or fell anything.