Afm problem

[KARNUT]

Amb temp, humidity, wind, tire pressures, cargo weight, etc were ALWAYs the same for those 4 drives?

 

Stated detour would already be a variable making it a "throw away" result when using it as a comparative marker.

You of course are being unreasonable. I was showing my best at 60. The others were close and multiple enough to see if there was a real difference. It wouldn’t be that far off regardless. You like some others can’t see the forest for the trees.

 

 

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[14burrito]

8 minutes ago, KARNUT said:

You of course are being unreasonable. I was showing my best at 60. The others were close and multiple enough to see if there was a real difference. It wouldn’t be that far off regardless. You like some others can’t see the forest for the trees.

 

 

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How is it being unreasonable to question the "validity" that someone can claim better (or worse) fuel economy with or w/o AFM when there are to many variables to make a true and accurate assessment?

 

Repeatability and reproducibility 

Edited October 16, 2020 by 14burrito

[Grumpy Bear]

11 minutes ago, 14burrito said:

How is it being unreasonable to question the "validity" that someone can claim better (or worse) fuel economy with or w/o AFM when there are to many variables to make a true and accurate assessment?

 

Repeatability and reproducibility 

https://19january2017snapshot.epa.gov/sites/production/files/2016-10/documents/2016-01-0662-fuel-eff-map-2014-6cyl-gm-eco-tec-4.3l-eng-cyl-deac_0.pdf

 

Try this. It ought be science enough for you. The rest are hopeless. 

 

The system is speed and load based with exceptions. The guys claiming no benefit are 'testing', if you can call it that, at speeds and loads where it is programed to be inactive.  At these speed and at those loads anytime it is on during decell the fuel trims are maximum. Read that the fuel is shut off and would be in any mode thus there is no savings.

 

They refuse to operate INSIDE it's window and then condemn it for not working. You can show them the data till cows fly and they will ignore that. You can't reason with them. They don't want it to work. They need it to fail. 

 

I do better that this studies 44% bag one on time because I understand the system, work with it and have made changes that allow it to remain on more than GM intended. It's only rocket science if you don't understand rockets. 

[Jsdirt]

I've been driving my failure prone toilet for 13 years. You tend to learn a thing or two about a vehicle you drive for that long. When towing I get variations in mileage - that's to be expected. Empty, every single tank is between 14.5 & 15.5. For many years before I plugged in the Range, mileage was 14.5 - 15.5. Hand calculated at every fill up. I get gas when I'm empty - I'm not one of those people that stops 15 times a week to put $10 in. I don't know how this qualifies as rocket science, but it is what it is!  

[Jsdirt]

1 hour ago, 14burrito said:

I'm stating instantaneous. 

 

I'd be hard to pressed to find a compilation of people able to 100% drive the same routes representatively with AFM active vs inactive...let alone have ambient conditions be exactly the same. Too many variables IMHO.

If there's too many variables, why even calculate mileage to start with? It's meaningless.

 

And I've never found any value in the "instant" MPG screen on my truck. 99 mpg coasting down hill, 5 mpg under load. In the end, I still get between 14.5 - 15.5 MPG empty. Towing I've seen 9-13.

 

I will say the one cross country trip I made with the truck, going 90+ MPH across the West on I-80, my hand calculated mileage was in the 18 range, motorcycle in back (a Honda XL350R - about 320 lbs roughly), and all kinds of camping gear for a 2 week trip. Probably due to the ethanol free fuel I found out there, and of course the lack of stop-and-go driving. This WITH the Range plugged in. That's the best mileage I've ever seen, aside from a brief period when it was brand new.

Edited October 16, 2020 by Jsdirt

[Daly]

18 minutes ago, Jsdirt said:

I've been driving my failure prone toilet for 13 years. You tend to learn a thing or two about a vehicle you drive for that long. When towing I get variations in mileage - that's to be expected. Empty, every single tank is between 14.5 & 15.5. For many years before I plugged in the Range, mileage was 14.5 - 15.5. Hand calculated at every fill up. I get gas when I'm empty - I'm not one of those people that stops 15 times a week to put $10 in. I don't know how this qualifies as rocket science, but it is what it is!  

Ken likes to hide in the scientific side of things. The place where there's perfect conditions for optimal results. Not the real world. There's no sense in arguing with him. Just agree like you would when you aging grandfather tells you the same story he's told you everytime you see him. 

My 2017 High Country (using this truck because it was the only truck I did nothing to but deactivate AFM) got and average of 20mpg for the first 22k km. Then I disabled AFM and for the following 20k km it got an average of 20mpg. Were the conditions the exact same over the 22k km and 20k km, no. But my driving habits stayed the same. And they were both a fairly long "test" for averaging. During both the truck saw, highway travel, stop and go, mixed driving, winter, and summer blend fuels, windy days, not so windy days, tow, not tow, you get the picture. Real world conditions and settings, and the AFM didn't make a lick of difference on any of the trucks. 

 

Edited October 16, 2020 by Daly

[KARNUT]

I like it when someone agrees that it doesn’t work at certain speeds. All you have to do is drive it at speeds it works. So I guess we need to drop speeds back down to the double nickel. Laughable. In reality it’s creative to raise the numbers for GM in a controlled environment. And people are falling for it.


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[14burrito]

I referenced "instantaneous" for 2 reasons.

 

1. 99% of the YouTube videos (I have watched) from people complaining about AFM and talking about their product bought to disable are "using the DIC as their reference for fuel savings between V8 and V4". Visual representation. 

 

2. I was curious if the DIC displayed value takes into account the cylinder deactivation or not when showing the "real time" economy. Hoping someone might have had an answer to that. I assume yes...but assuming vs knowing are different. This circles back a little to point 1, how it is visually represented to the driver. 

[Daly]

The DIC uses injector flow rates to calculate. 

[15 Z71]

You guys are getting nuts on this gas mpg and AFM. I just put gas in mine and drive it. Lol

[Jsdirt]

Same here.

 

I have to run premium, otherwise when I tow, this thing will knock itself to pieces, with or without the Hypertech program installed. Got to do it, so no sense worrying about costs I can't control. At least it's predictable.

[rremesal]

 

[Grumpy Bear]

On 10/6/2020 at 7:49 PM, Pell4 said:

It’s it fair that I buy a used 2015 with 80k on it and at 89k I have to replace the motor due to afm system failure.I have always loved my chevys 

I have had a least 9 trucks and this One disappointed me big time and cost me a lot of money. The truck was clean and well cared for .This

issue has nothing to do with neglect in any Way. I really trust my 99 Tahoe with 200k on it more than I do my 2015 .

Trying to stay loyal but this one hurts 

You buy a used truck. Let's try again. You buy a high mileage used truck. It fails you and you state "This issue has nothing to do with neglect in any Way" and ask if that is FAIR. You say this AFM failure resulted in a complete motor failure requiring a replacement. You have exactly 2 post. 

 

Girls we've been punked. 

AGAIN

 

Count the number of ways his first post stinks like TROLL BAIT.

 

 

 

 

 

[Jsdirt]

Troll or not, I never had an engine fail in ANY way, shape, or form back in the day ... and let me tell you, I was HARD on my stuff! Let alone fail at anything sub-100k miles. Hell, in those days sub-250k miles! Everything I owned back then was already WELL used by the time I got it. Next owner was always the junkyard ... 

 

Only engine I ever ruined in my life out of 11 GM products, and 3 FoMoCo products was a crappy 305 someone threw in a '71 C20 right before I bought it. Melted the #7 & 8 big end bearings right out of it. They looked like purple tinfoil. I must've had that thing up to 6,800 RPM down in RI on my way back from TF Green with a buddy of mine.4.56 gearing helped there. Had a Mercedes on my ass that was pissing me off, so I stuffed it to the rug to put some distance between us. I sure showed him, LOL! What a racket that made ... 

Edited October 16, 2020 by Jsdirt

[KARNUT]

My brother in law routinely puts 300K miles on his trucks and SUVs. He refuses to buy new. He even has his first car, 69 firebird. He has two girls in college. He’s a GM only person. He makes big bucks too. He drives a Chevy truck with 280 on it. His youngest drives his wife’s old Tahoe with 200K on it. The oldest a p/u just at 200k. He has his first cylinder deactivation Yukon. No problem with his maintenance, we’ll see.


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