Two Questions
Race Director
Joined: Feb 2012
Posts: 10,776
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I haven't seen any info on either of those yet. My guess would be there won't be a CAGS given different engines/trannies...but who knows?
Le Mans Master
Joined: Feb 2000
Posts: 8,099
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From: Oakland, CA
I wonder if they'll still want CAGS to maintain near parity between the manual and the automatic. They don't want to advertise significantly different numbers between the two.
I bet we still have CAGS.
I bet we still have CAGS.
Thread Starter
Racer
Joined: Apr 2006
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From: Cocoa Beach FL
Not trying to answer my own question - just guessing e nada mas.
Race Director
Joined: May 2008
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From: Manheim Pennsylvania
Your only allowed one question. I bet there will be a CAGS system of some sort. As for cylinder activation, the cylinders come on line as power is required, idle would be 4 cyl., when the throttle is advanced the remaining cylinders should immediately fire, cylinder drop off will happen as engine power reaches power level required, I think (my guess) all cylinders will not be on line at cruise power, they will come and go as power demand dictates (activation will be immediate as required). Simple example; remember the hit/miss engines of the past, the rpm remains constant, when power is required the cylinder immediately fires to hold required rpm. This is accomplished mechanically, just think how fast a computer system will manage power. I wonder what is programed into the engine if a computer failure would happen, all cylinders on line?
Drifting
Joined: Feb 2008
Posts: 1,682
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From: Coatesville PA
I can guarantee it'll have CAGS. It's pretty simple. With direct injection it might hit the same mpg highway. But why stop there, that's no improvement and doesn't help protect the corvette from the EPA police. The displacement on demand helps improve the highway mpg, however, without cags the city will stay the same if not be slightly lower. So with cags and displacement on demand, both highway and city mpg should be greater then currently.
Le Mans Master
Joined: Feb 2000
Posts: 8,099
Likes: 398
From: Oakland, CA
Where did you pick this idea up, that it's only good for highway economy? Am I missing something?
.Jinx
Tech Contributor
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From: Charlotte, NC (formerly Endicott, NY)
Bill
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Drifting
Joined: Feb 2008
Posts: 1,682
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From: Coatesville PA
Ah. I swore I had seen, at least for the camaro, that there was a certain speed range it would activate in, as well as engine load. I swore someone posted the limitations of afm for the camaro in one of the 100 other "4-6-8 er... afm will spell doom for the corvette." Always made sense to me that it kicked in for highway use since that's where minimal hp is needed.
As for city driving, it might help real world for the vette, but no way it's activating THAT much around town for a camaro or especially a suburban size suv. Yeah a 2 mile long stretch doing 40 sure helps, but accelerating to and from a stop light every half mile there's no way it's effective.
As for city driving, it might help real world for the vette, but no way it's activating THAT much around town for a camaro or especially a suburban size suv. Yeah a 2 mile long stretch doing 40 sure helps, but accelerating to and from a stop light every half mile there's no way it's effective.
Drifting
Joined: Feb 2008
Posts: 1,682
Likes: 3
From: Coatesville PA
Well, seems to be solely based on throttle percentage. So it can engage at any speed, so long as the gear its in puts it under the threshold of throttle percentage. So it will kick off at ahigh enough speed because the throttle will simply be open enough to retain that speed, but it won't not kick on simply because you're going to slow. However a quick search found that for the g8 gt, it was only active at 7% throttle or less. Obviously they can tune each car to kick in at at higher or lower percentage, but it doesn't sound like it does much good real-world city driving if the torquey g8 demands v8 power at only 8% throttle.
Now, could it help the official ratings, I'm sure, but I don't know the exact testing procedure.
Now, could it help the official ratings, I'm sure, but I don't know the exact testing procedure.