In yet another example of the contempt GM has for it's buying public, the current ad for the 2011 Silverado states it has " active fuel management". nuff said. JR Dweller in the cellar
OT: GM thinks your'e stupid
Dec 02, 2010
26 Replies
And this is stupid why?
Thank You, Randy
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I reckon you could describe a carby system as active fuel management.
Advertising double-speak . Makes the customer think that they've got something new that others don't have . I mean , how can fuel management be anything but active ?
Not necessarily , them ad-men are almost as good at doublespeak as lawyers ...
"Active Fuel Management" means "turning off" some cylinders when the power demand is low... like the old Cadillac V8-6-4 system; only this one actually works. So yes, they do have something that others don't have. The poor advertising guy probably thought you would actually find out what it is and how it worked before you passed judgment on what he named it. LOL Maybe there's a good reason GM thinks some of you guys are stupid?
I don't think that the OP was being careful when he criticized GM. "Active Fuel Management" is a trademarked system used by GM:
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they should have called it something more snazzy.
The only thing GM has that other's don't is that trademarked name:
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GM as been actively managing fuel since the late-70's Buick turbo V6 that slowly advanced the spark until a ceramic microphone tuned to the engine block resonance detected a ping. This let it constantly adapt for best performance for the fuel's octane and the current manifold pressure. It's a computerized, closed-loop improvement of the old vacuum advance which assumes that lower peak cylinder pressure permits an earlier spark.
jsw
How about more descriptive? ...lew...
So, when you really, really need that instantaneous power to get out of the way of the idiot who just blew the red light, how long is it going to take to get those cylinders back into service? A few seconds? Just long enough to get slammed? Value: Priceless.
LJ--who has used pedal-to-the-metal nearly as often as well-controlled braking to avoid accidents throughout his driving years.
-- "Human nature itself is evermore an advocate for liberty. There is also in human nature a resentment of injury, and indignation against wrong. A love of truth and a veneration of virtue. These amiable passions, are the latent spark. If the people are capable of understanding, seeing and feeling the differences between true and false, right and wrong, virtue and vice, to what better principle can the friends of mankind apply than to the sense of this difference?" --John Adams
Why would you think it would take a few seconds? I'm thinking it would take more like a couple of revolutions of the crankshaft.
And exactly why would this take seconds? If it did, how would the vehicle ever accelerate?
Just one. It's all servo/solenoid controlled.
That's about an order of magnitude faster than Jaqueass can realize he's not been paying attention - apparently for the umpteenth time.
JC
On an 8 cyl engine, approxemately 1/8 of an engine rotation, which at
2000 RPM is 1/16000 of a minute, or 1/266th of a second, give or take.Don't know about Gm's trademarks. Active Fuel Management in the generic sense equates to feedback loop, oxygen sensor controlled fuel/air ratio, carbed or injected, present on all cars of any note since 1983.... JR Dweller in the cellar
JR North wrote:
I have active fuel management, I keep an eye on the gas gage and buy more before I run out. ;)
Wes
OK, that's the theory. What's the reality? I don't even think the throttle positioner gives you that quick a response.
-- "Human nature itself is evermore an advocate for liberty. There is also in human nature a resentment of injury, and indignation against wrong. A love of truth and a veneration of virtue. These amiable passions, are the latent spark. If the people are capable of understanding, seeing and feeling the differences between true and false, right and wrong, virtue and vice, to what better principle can the friends of mankind apply than to the sense of this difference?" --John Adams
It doesn't need to. When cylinders are deactivated, the throttle is already open farther than it would be if the cylinders weren't deactivated.
Keep thinking. It'll kick in soon enough.
-- "Human nature itself is evermore an advocate for liberty. There is also in human nature a resentment of injury, and indignation against wrong. A love of truth and a veneration of virtue. These amiable passions, are the latent spark. If the people are capable of understanding, seeing and feeling the differences between true and false, right and wrong, virtue and vice, to what better principle can the friends of mankind apply than to the sense of this difference?" --John Adams
"It" would be?
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