V8=v4 ?
Thread Starter
Melting Slicks
Joined: Mar 2003
Posts: 2,928
Likes: 55
From: Port Saint Lucie, Florida
V8=v4 ?
Hi
i I have a 2016 Stingray and l was told that l have a system that when l come to a stoplight l will go from V8 to V4..
While l was in my driveway in neutral the icon said l was in V8.
The port under my dashboard is empty and l have the plug-in a friend gave me out of a 2014 vette to stop the
switching from v8 to v4.
Is it possible this economy feature was not available for 2016
Thanks
i I have a 2016 Stingray and l was told that l have a system that when l come to a stoplight l will go from V8 to V4..
While l was in my driveway in neutral the icon said l was in V8.
The port under my dashboard is empty and l have the plug-in a friend gave me out of a 2014 vette to stop the
switching from v8 to v4.
Is it possible this economy feature was not available for 2016
Thanks
Racer
Joined: Jun 1999
Posts: 405
Likes: 90
From: Chandler Arizona
The AFM system is present on all C7s regardless of model year. The switch to V4 occurs while the vehicle is moving, it doesn’t specifically go into that mode at idle, I don’t think it does that at idle at all. There are many threads about it on the forum. Manual cars only switch if in eco mode. Auto cars do it unless it is in manual mode. If you bought it used the AFM could have been tuned out or been mechanically removed by the previous owner. I have used the Range AFM disabler for years, but it does interfere with the OBD II readiness, there are many threads about this also.
Racer
Joined: May 2023
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From: Niagara, Ontario, Canada
Safety Car
Joined: Mar 2006
Posts: 4,514
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From: Chester VA
The AFM system is present on all C7s regardless of model year. The switch to V4 occurs while the vehicle is moving, it doesn’t specifically go into that mode at idle, I don’t think it does that at idle at all. There are many threads about it on the forum. Manual cars only switch if in eco mode. Auto cars do it unless it is in manual mode. If you bought it used the AFM could have been tuned out or been mechanically removed by the previous owner. I have used the Range AFM disabler for years, but it does interfere with the OBD II readiness, there are many threads about this also.
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From: In a parallel universe. Currently own 2014 Stingray Coupe.
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The AFM system is present on all C7s regardless of model year. The switch to V4 occurs while the vehicle is moving, it doesn’t specifically go into that mode at idle, I don’t think it does that at idle at all. There are many threads about it on the forum. Manual cars only switch if in eco mode. Auto cars do it unless it is in manual mode. If you bought it used the AFM could have been tuned out or been mechanically removed by the previous owner. I have used the Range AFM disabler for years, but it does interfere with the OBD II readiness, there are many threads about this also.
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From: Ventura Co Ca
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If your AFM is working properly, you will not feel it switch over. The only way I can tell is by looking at the gauge. I have a 2016. 
Burning Brakes
Joined: Jun 2018
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From: SC
Melting Slicks
Joined: Jan 2017
Posts: 2,696
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From: CONCORD CA.
You need to be moving and have the cruise control on (think freeway speeds). You will also have to have the drive mode set to Economy. Once these parameters are set, it will automatically go into its V4 mode. If you accelerate while in this mode, it will automatically revert back V8. When you then get back to your cruise setting, it will go back to V4. This only works if you are in the Eco setting. I find that in V4 mode, does get me anywhere from 2 - 4 mpg improvement.
Race Director
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From: Grapevine Tx
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You need to be moving and have the cruise control on (think freeway speeds). You will also have to have the drive mode set to Economy. Once these parameters are set, it will automatically go into its V4 mode. If you accelerate while in this mode, it will automatically revert back V8. When you then get back to your cruise setting, it will go back to V4. This only works if you are in the Eco setting. I find that in V4 mode, does get me anywhere from 2 - 4 mpg improvement.
Melting Slicks
Joined: Dec 2004
Posts: 2,455
Likes: 711
I have owned three C7s but only one was an A8. I was amazed at how it stayed in V4 on long gradual hills and short steep hills on backroads. I used to own a Silverado and it would go into V4 while I was pulling a 2,000 pound trailer on level roads. Personally, I think V4 should have switched off when the truck was pulling a trailer.
Safety Car
Joined: Sep 2005
Posts: 4,212
Likes: 643
From: Orange County Ca
The whole v8/v4 thing is a gimmick to please the epa.
It adds a whole new level of complexity to your engine that may decrease durability. It adds little to no fuel economy.
Keep your disabler, it's a good solution to a useless product.
It adds a whole new level of complexity to your engine that may decrease durability. It adds little to no fuel economy.
Keep your disabler, it's a good solution to a useless product.
Burning Brakes
Joined: Jun 2018
Posts: 756
Likes: 172
From: SC
What is the downside of the disabler?