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AFM V8/V4 Mode

Re: AFM V8/V4 Mode

Postby 6Sixathome » Feb 15 2012, 3:24pm

EKinMN wrote:I appreciate the posting of the parameters. It's interesting information.

Still, all I want is for this engine to only go into V4 mode while on the freeway. I agree with an earlier poster about not having it kick in until above about 45-50MPH. The engine lugging is just annoying. It's especially bad if you do not feather the throttle. if you jump on it a bit while going slowly in V4, you get whacked as it goes into V8, and then again when it downshifts. That's just really bad programming. GMC really has some opportunity here, because my 6 speed Acadia shifts in a dumb way as well--completely misses the power band in 3rd gear. Do the GM programmers drive these vehicles in the real world, or is this purely a mileage play?

Sorry for the attitude. I had a long stop and go commute this morning, and this was noticeable and annoying, so it's fresh in my mind.
My AFM is'nt too bad feeling, it's when I'm watching it go in and out of v4 mode is when I can notice it. I could NOT agree more on the 6 speeds in our Lambda's, the trans shifts suck to say the least.
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Re: AFM V8/V4 Mode

Postby O'Brien » Feb 15 2012, 6:41pm

Well...I'm not going to be an apologist for critiquing a system that has design flaws when the manufacturer and its dealers are not willing to adjust or adapt parameters to suit the consumer.Get a new PCM or buy a tuner to adjust parameters?? Well,no. If and when I get a tuner it will be to disable the AFM. I didn't buy a truck with a V-8 to molly coddle it up and down the roads concerned about micro-managing mpg. And what exactly was posted as to the inaccuracy of the AFM system and its parameters? :roll:
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AFM V8/V4 Mode

Postby 1stsilverado » Feb 17 2012, 12:10am

Sent a email to gm. See if I get any email back. Would be great if others would email them. faq@chevrolet.com. I asked if they can change when the afm kicks in to 45-50 mph or possible put it in the dic so the owner can change it.
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AFM V8/V4 Mode

Postby 1stsilverado » Feb 17 2012, 12:18am

Forgot to mention. I do not wish to use and or buy a tuner to change this feature. In risk of voiding waranty. Yes, I know some tuners mask program changes or I could buy another ecu. Not going to do it. Thanks for the suggestion.
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Re: AFM V8/V4 Mode

Postby BlackZ71 » Feb 18 2012, 6:12am

EKinMN wrote:If you have the 6 speed auto, you can also run in 4th or 5th (manual mode) around town, and it will not go into V4. But yes, most tuners can turn it off.


I tried out driving in M4 instead of putting our truck in D tonight and what a smooth difference staying in V8 mode makes around town. The DIC mileage looked to me to be about the same as it was when lugging along in V4 mode. The big plus I experienced by staying in V8 mode was no more funky sounding exhaust, engine vibration or chassis rattles. I also noticed that the transmission seemed to down shift much less than it did in V4 mode. Thanks for posting this suggestion.
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Re: AFM V8/V4 Mode

Postby EKinMN » Feb 18 2012, 6:27am

You are welcome. I have been doing the same thing lately. I have noticed that now, when I do not use the manual transmission mode, it seems like it goes to V4 even more often. It's not bad....just annoying. I agree though, I like the smoothness of the constant V8 mode.
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Re: AFM V8/V4 Mode

Postby Mr. Horsepower » Feb 23 2012, 9:05pm

Not that this topic hasn't been beat to death already...

I disabled the AFM via my tuner about two weeks ago after reading this thread. I can definitely say, it sure does make a difference in the driving experience. All 8 cylinders are going constantly, and overall the acceleration and shifts just seem much smoother and more predictable.

It may be a little premature, but I'm not seeing a big difference in my fuel mileage (2 tanks of gas and around 800 miles). Maybe 0.1 or 0.2 mpg less. My driving habits haven't changed, so maybe the AFM wasn't really providing a benefit for my particular commute anyway. Even the GM documentation says at most you're only going to get 3-5% better economy with the AFM. Doesn't seem worth it to me.
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Re: AFM V8/V4 Mode

Postby 6Sixathome » Feb 23 2012, 10:14pm

Mr. H.P., what tuner do you have?
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Re: AFM V8/V4 Mode

Postby Mr. Horsepower » Feb 23 2012, 10:23pm

6Sixathome wrote:Mr. H.P., what tuner do you have?


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Re: AFM V8/V4 Mode

Postby wabbitchaser » Feb 27 2012, 10:41pm

I wish to be a little aplogetic, for not fully understanding many of your complaints about the V4 mode. I recently made trip to Birmingham, AL and drove many miles in bumper to bumper traffic, and noticed the sluggish take off when in V4, and the harshness in the up and down shift of the tranny. I do believe I get better gas mileage due to the V4 mode here in Florida, where my driving is 99% 60-65 mph. Rural to suburban driving. I know if I'm ever in traffic again I will shift down to M4.
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