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Old 06-12-2008, 09:14 PM   #1
The80sman
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AFM v8 Engine

Im looking forward to the new Camaro just as much as anyone else but there is a little thing about it that just keeps bothering me. Kinda like when you go to make a chocolate shake...but theres no chocolate or your eating Oreo cookies and then you findout there no milk. What im talking about is the AFM. I was talking with a buddy that works at a Chevy dealer and he says that AFM stuff is balony. I forgot which one of his new suv's has the AFM but he says it still sucks alot more gas than his Cobalt SS. Also the v8 with AFM's exhaust is kinda crappy when compared to a regular V8. This is just a little topic i find interesting and would like to get other's views on it.
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Old 06-12-2008, 09:38 PM   #2
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Im looking forward to the new Camaro just as much as anyone else but there is a little thing about it that just keeps bothering me. Kinda like when you go to make a chocolate shake...but theres no chocolate or your eating Oreo cookies and then you findout there no milk. What im talking about is the AFM. I was talking with a buddy that works at a Chevy dealer and he says that AFM stuff is balony. I forgot which one of his new suv's has the AFM but he says it still sucks alot more gas than his Cobalt SS. Also the v8 with AFM's exhaust is kinda crappy when compared to a regular V8. This is just a little topic i find interesting and would like to get other's views on it.
Amazing, his SUV which probably is 50-70% heavier than his Cobalt SS gets worse gas mileage than his Cobalt. I'm truly shocked, I would have thought that heavy old SUV would get twice the gas mileage of a Cobalt SS!!
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Old 06-12-2008, 09:44 PM   #3
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and another thing about AFM and others........ well if your going AFM ypu cant have a manual trans
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Old 06-12-2008, 10:03 PM   #4
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and another thing about AFM and others........ well if your going AFM ypu cant have a manual trans
rephrase that...
"If you're going manual trans you can't have AFM."


There are options of getting around the AFM....
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Old 06-12-2008, 10:04 PM   #5
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and another thing about AFM and others........ well if your going AFM ypu cant have a manual trans
y not? AFM from what I understand is controlled by throttle position, oil pressure and the computer.
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Old 06-12-2008, 10:16 PM   #6
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There are problems with the control timing and the manual trans not allowing computer control of the shifting. Called "dirveability" problem. Don't expect AFM on any manual trans engines, expect the germens to be the first ( Always) to have a AFM system with a MT
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Old 06-12-2008, 10:21 PM   #7
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What's the problem? You put a sensor in to tell if the engine is in 6th gear and cruising RPM's and you AFM off a few cylinders. If the clutch is pressed in you turn them back on and you're done.

I'm filing for the patent right now, seeing how the world was too stupid to do this I deserve to license it.
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Old 06-12-2008, 10:28 PM   #8
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AFM only promises somewhere around 10% fuel economy improvement overall. It generally activates on the highway at running speed, so it saves you on longer drives more than shorter ones.

His four-cylinder car should get better mileage by default. That's not a fair comparison.
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Old 06-12-2008, 10:35 PM   #9
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What's the problem? You put a sensor in to tell if the engine is in 6th gear and cruising RPM's and you AFM off a few cylinders. If the clutch is pressed in you turn them back on and you're done.

I'm filing for the patent right now, seeing how the world was too stupid to do this I deserve to license it.
keep in mind that your calling GM stupid as well, which was the first to create a system like that, and chrysler with the MDS, and ford......who cares about ford anyway lol
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Old 06-12-2008, 10:45 PM   #10
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Old 06-12-2008, 10:54 PM   #11
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It's not quite as simple as a few sensors.

I didn't design anything, but as I understand it, AFM talks to the Automatic and it helps to absorb the pulses of switching on and off through torque managment or something like that. It also maximizes it's fuel-savings ability because it can 'adust' the automatic's responses.

With a manual, the computer has to always be ready for an unexpected gear change. It has no way of absorbing any harshness/vibration, so consumers will complain about that, and will definitely not work to it's highest ability as far as saving fuel. So in the end, you're better off with just a manual.

Last I heard, GM was working on getting the manual to work with it...but were having trouble. if anyone gets it to work, though -- I think GM'll be the one to do it.
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Old 06-12-2008, 11:01 PM   #12
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I'm fine with 1st to third to 5th-6th for saving gas.
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Old 06-13-2008, 12:23 AM   #13
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I know it may seem im making a big deal out of something that isnt but its one of those little things that erk me.(dont know if erk is a word but it sounds right ) I think they should make AFm an option but then again that would probably cost too much to have as an on or off option.
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Old 06-13-2008, 12:37 AM   #14
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I know it may seem im making a big deal out of something that isnt but its one of those little things that erk me.(dont know if erk is a word but it sounds right ) I think they should make AFm an option but then again that would probably cost too much to have as an on or off option.
They did it with traction control, they should figure it out...soon?!?!
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Old 06-13-2008, 02:30 AM   #15
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There is no difference in exhaust sound at all with AFM. My dads impala SS has it, and you cant tell the difference when it switches on. Thats probably because it only turns on when the engine is at minimal load on the highway so you wouldnt be able to hear it anyway.

We have noticed no drawbacks to AFM. The gas savings are minimal with it on the impala. This, in my opinion, is because it's only a four speed auto. The best gas mileage i have seen on road trips in the SS is about 30 mpg. Now the camaro will have 2 more gears, maybe VVT, direct injection, and maybe some other stuff that can help so you make your own conclusions.
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Old 06-13-2008, 07:00 AM   #16
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I forgot which one of his new suv's has the AFM but he says it still sucks alot more gas than his Cobalt SS. Also the v8 with AFM's exhaust is kinda crappy when compared to a regular V8.
AFM is never going to make a 5000 pound wind-pushing SUV sip like a 2500 pound sleek compact coupe. It's there for incremental improvement, not revolutionary change.

I don't know why there would be a different exhaust on an AFM motor. I doubt there is.

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What's the problem? You put a sensor in to tell if the engine is in 6th gear and cruising RPM's and you AFM off a few cylinders. If the clutch is pressed in you turn them back on and you're done.
Vehicle will buck when switching modes if there's no torque converter to absorb the shock. Supposedly. I'd accept it.

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one of those little things that erk me.(dont know if erk is a word but it sounds right )
The word is irk. As in, grammar nazis like me irk other people.

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Now the camaro will have 2 more gears, maybe VVT, direct injection, and maybe some other stuff that can help so you make your own conclusions.
I thought only the V6 will have DI. Also, I think any AFM engine must have VVT; don't they have to close the valves for it to be worthwhile?
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Old 06-13-2008, 07:08 AM   #17
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So no AFM on Manuals. Bummer :( Oh well, most likely I'll have to wait until there's a V8 with kickass mileage for the Camaro anyways.
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Old 06-13-2008, 09:19 AM   #18
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I work for a Chevy Dealer and I have never noticed anything that would make me say that AFM is anything less than an awesome idea executed greatly. A lot of points I was going to make have already been posted, so to sum it up, it works, and people like it. Anything that saves gas nowadays is welcome in my book...
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Old 06-13-2008, 09:29 AM   #19
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I work for a Chevy Dealer and I have never noticed anything that would make me say that AFM is anything less than an awesome idea executed greatly. A lot of points I was going to make have already been posted, so to sum it up, it works, and people like it. Anything that saves gas nowadays is welcome in my book...
+2 If it saves some gas, I'll take it, as long as it doesn't sacrifice power when I want it
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Old 06-13-2008, 09:37 AM   #20
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just so you guys know the G8 GXP will not have AFM in AT or MT.So that would lead me to believe that the LS based v8's for the camaro will not have it either.
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Old 06-13-2008, 09:40 AM   #21
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I thought only the V6 will have DI. Also, I think any AFM engine must have VVT; don't they have to close the valves for it to be worthwhile?
For this go around, the V6 will be the only DI engine (unless they shoehorn the Turbo 4 in)

AFM doesn't need VVT to work. They're two sperate systems. AFM utilizes special hydrolic lifters that 'disconnect' the camshaft from the pushrods. Resulting in no valve-movement.

VVT alters the valve timing by using phasers. I'm still fuzzy exactly how. I'll have to read into that today.
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Old 06-13-2008, 10:24 AM   #22
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VVT alters the valve timing by using phasers. I'm still fuzzy exactly how. I'll have to read into that today.
OIC. That's easy...It just vaporizes the cam lobe.


That ooze guy really needs an oil change. That oil is black like it's 50,000 miles old!
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Old 06-13-2008, 10:31 AM   #23
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Old 06-13-2008, 11:19 AM   #24
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Im looking forward to the new Camaro just as much as anyone else but there is a little thing about it that just keeps bothering me. Kinda like when you go to make a chocolate shake...but theres no chocolate or your eating Oreo cookies and then you findout there no milk. What im talking about is the AFM. I was talking with a buddy that works at a Chevy dealer and he says that AFM stuff is balony. I forgot which one of his new suv's has the AFM but he says it still sucks alot more gas than his Cobalt SS. Also the v8 with AFM's exhaust is kinda crappy when compared to a regular V8. This is just a little topic i find interesting and would like to get other's views on it.
Anyone that I have heard talking about AFM says that it works. But SUV's can't use it as much as a car can. And if you drive too fast or encounter an incline it doesn't activate.
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