Eco Mode
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Joined: Nov 2005
Posts: 89
Likes: 2
So the consensus is that V4 operation is not the least bit harmful to the drive train in the long term?
I just didn't like the sound of GM needing to beef-up the torque tube due to vibration induced by V4 operation. But if the C7 is happy with it, and there will be no long term detrimental impact on the drive train, then I really like the AFM concept!
I just didn't like the sound of GM needing to beef-up the torque tube due to vibration induced by V4 operation. But if the C7 is happy with it, and there will be no long term detrimental impact on the drive train, then I really like the AFM concept!
Burning Brakes
Joined: Apr 2014
Posts: 854
Likes: 302
I'm with you on this. I can get 32 MPG if I want, or I can accelerate as fast at traction will allow if I feel like it. This is such a win-win I just don't see the hate as anything more than grousing because they have no choice to turn it off in auto cars. I'm far more upset that our cars can rat us out after a collision and we have no say in that total disregard for our privacy.
Le Mans Master
Joined: Aug 2015
Posts: 8,243
Likes: 4,618
From: Southwest Florida
<p></p><p> </p><p>Active Fuel Management (AFM), which shuts down the LT1’s firing cylinders from eight to four by disabling the valves to the cylinders, also brings the efficiency of the 6.2L pushrod motor to never-before-seen heights. When AFM commences, the engine turns the 6.2L V8 into a 3.1L V4, shutting down cylinders 1, 4, 6 and 7, and firing only cylinders 8, 2, 5 and 3 in that order. Otherwise, the complete firing order is 1, 8, 7, 2, 6, 5, 4, 3.</p>
Melting Slicks
Joined: May 2014
Posts: 2,611
Likes: 89
I'm with you on this. I can get 32 MPG if I want, or I can accelerate as fast at traction will allow if I feel like it. This is such a win-win I just don't see the hate as anything more than grousing because they have no choice to turn it off in auto cars. I'm far more upset that our cars can rat us out after a collision and we have no say in that total disregard for our privacy.
Burning Brakes
Joined: Apr 2015
Posts: 755
Likes: 19
From: San Antonio TX
Burning Brakes
Joined: Apr 2015
Posts: 755
Likes: 19
From: San Antonio TX
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Instructor
Joined: Sep 2004
Posts: 214
Likes: 96
From: Brimfield Illinois
AFM works
Rarely drive my 2015 C7 auto in Eco. However, some weeks ago on our way to Woodward Dream Cruise set it to Eco and put the cruise on for the drive on I-94 to Detroit.
After returning home and scrolling thru the display I saw the 38.9 MPG for some 50 mile stretch. Just amazed we can have a car with small block V8 producing 460 HP and 460 lb-ft T capable of 38.9 MPG for a 50 mile stretch. Love the C7 and the technology that comes with it.
After returning home and scrolling thru the display I saw the 38.9 MPG for some 50 mile stretch. Just amazed we can have a car with small block V8 producing 460 HP and 460 lb-ft T capable of 38.9 MPG for a 50 mile stretch. Love the C7 and the technology that comes with it.
Le Mans Master
Joined: Sep 2012
Posts: 7,146
Likes: 1,940
From: Hagerstown MD
St. Jude Donor '15-'16,'18
Rarely drive my 2015 C7 auto in Eco. However, some weeks ago on our way to Woodward Dream Cruise set it to Eco and put the cruise on for the drive on I-94 to Detroit.
After returning home and scrolling thru the display I saw the 38.9 MPG for some 50 mile stretch. Just amazed we can have a car with small block V8 producing 460 HP and 460 lb-ft T capable of 38.9 MPG for a 50 mile stretch. Love the C7 and the technology that comes with it.
After returning home and scrolling thru the display I saw the 38.9 MPG for some 50 mile stretch. Just amazed we can have a car with small block V8 producing 460 HP and 460 lb-ft T capable of 38.9 MPG for a 50 mile stretch. Love the C7 and the technology that comes with it.
Amazing car! I got the same mileage going up to Carlisle from Hagerstown. Cruising at 65, level highway. Very pleased with the combination of performance, handling, luggage space and mileage.
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Joined: Mar 2001
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Interesting discussion on the AFM process. Thanks for posting the comments.
Racer
Joined: Feb 2012
Posts: 341
Likes: 4
I don't like it. I can notice the transition, it feels like a slight hesitation when you hit the gas pedal. Some people seem really happy to gain maybe two miles per gallon of gas to due to eco mode. I'm not one of them.
Race Director
Joined: May 2008
Posts: 10,742
Likes: 629
From: Manheim Pennsylvania
Rarely drive my 2015 C7 auto in Eco. However, some weeks ago on our way to Woodward Dream Cruise set it to Eco and put the cruise on for the drive on I-94 to Detroit.
After returning home and scrolling thru the display I saw the 38.9 MPG for some 50 mile stretch. Just amazed we can have a car with small block V8 producing 460 HP and 460 lb-ft T capable of 38.9 MPG for a 50 mile stretch. Love the C7 and the technology that comes with it.
After returning home and scrolling thru the display I saw the 38.9 MPG for some 50 mile stretch. Just amazed we can have a car with small block V8 producing 460 HP and 460 lb-ft T capable of 38.9 MPG for a 50 mile stretch. Love the C7 and the technology that comes with it.
. M7, I see 21 to 26 mpg average fuel consumption every fill up with all 8 cylinders hitting. Mixed driving.
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
Agree, except that my A8 is in V4 mode regularly in any Driving Mode, so I have no choice unless I want to shift manually, which I don't most of the time. Avoiding better mileage because of a slight sensation when V4 activates or deactivates seems irrational considering that reducing fuel consumption is a virtue on a number of fronts--primarily that it saves us money and the car pollutes less, so what's a slight sensation every now and again? Anyway, I rarely sense mine at all, and if I didn't usually watch its operation on the DIC I wouldn't know it was active or not the vast majority of the time. I find getting around 35mpg at normal highway speeds to be an amazing achievement considering the performance of the car.
Instructor
Joined: Aug 2015
Posts: 117
Likes: 4
From: Lansing MI
Agree, except that my A8 is in V4 mode regularly in any Driving Mode, so I have no choice unless I want to shift manually, which I don't most of the time. Avoiding better mileage because of a slight sensation when V4 activates or deactivates seems irrational considering that reducing fuel consumption is a virtue on a number of fronts--primarily that it saves us money and the car pollutes less, so what's a slight sensation every now and again? Anyway, I rarely sense mine at all, and if I didn't usually watch its operation on the DIC I wouldn't know it was active or not the vast majority of the time. I find getting around 35mpg at normal highway speeds to be an amazing achievement considering the performance of the car.
Oil companies are a bunch of crooks who own too many politicians. I love a powerful car and I'll be paying too high of a price for high octane ($.40/gal more - used to be only $.20) so getting better mpg's is fine with me.
Melting Slicks
Joined: Oct 2013
Posts: 3,006
Likes: 477
From: Las Vegas Nevada
I used ECO from Vegas to San Francisco to Levi Stadium. It helped save a little till the next fill up.
The next 1100 miles down the coast were all in SPORT mode. Doubt I will use ECO again.
The next 1100 miles down the coast were all in SPORT mode. Doubt I will use ECO again.
Le Mans Master
Joined: Sep 2012
Posts: 7,146
Likes: 1,940
From: Hagerstown MD
St. Jude Donor '15-'16,'18
Agree, except that my A8 is in V4 mode regularly in any Driving Mode, so I have no choice unless I want to shift manually, which I don't most of the time. Avoiding better mileage because of a slight sensation when V4 activates or deactivates seems irrational considering that reducing fuel consumption is a virtue on a number of fronts--primarily that it saves us money and the car pollutes less, so what's a slight sensation every now and again? Anyway, I rarely sense mine at all, and if I didn't usually watch its operation on the DIC I wouldn't know it was active or not the vast majority of the time. I find getting around 35mpg at normal highway speeds to be an amazing achievement considering the performance of the car.
Not totally seamless but unless I'm watching the DIC I really don't notice the transition.
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
This may be a bit **** for some, but when possible I fill the tank when the gas gauge gets to 1/2, alternating between 89- and 93-octane. From this procedure the mix translates to about 91-octane, give or take a fraction, which is the spec for the car. This saves since the middle grade is cheaper by 20-25¢/gal. than premium in my area. I also did this in my C6 and in neither car have I sensed any issues. I tried 89 (no mix) once in the C6 and could tell a difference in performance, as the knock sensor apparently was backing off on ignition advance enough for me to notice. Not so with the mix, though. BTW, I only use Top Tier gas in the C7.
Last edited by iclick; Sep 20, 2015 at 06:33 PM.