"Range" Device - Disabling AFM System
Thread Starter
Drifting
Joined: Jul 2016
Posts: 1,921
Likes: 1,171
From: Keswick, Virginia
The 7M Corvettes don't need it because the car won't go into V4 unless you have the drive mode set to "ECO" and are driving at a steady speed. I keep my car in "TOURING" or "SPORT" to avoid having the issue.
I bought the Range device for my girlfriend's C7 because hers has the 8A in it. I will install it this weekend and let you all know how well it works.
I bought the Range device for my girlfriend's C7 because hers has the 8A in it. I will install it this weekend and let you all know how well it works.
Team Owner
Joined: Feb 2000
Posts: 45,609
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From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
The 7M Corvettes don't need it because the car won't go into V4 unless you have the drive mode set to "ECO" and are driving at a steady speed. I keep my car in "TOURING" or "SPORT" to avoid having the issue.
I bought the Range device for my girlfriend's C7 because hers has the 8A in it. I will install it this weekend and let you all know how well it works.
I bought the Range device for my girlfriend's C7 because hers has the 8A in it. I will install it this weekend and let you all know how well it works.
Thread Starter
Drifting
Joined: Jul 2016
Posts: 1,921
Likes: 1,171
From: Keswick, Virginia
Saved $180
There is a wealth of knowledge & experience on this forum.
Thread Starter
Drifting
Joined: Jul 2016
Posts: 1,921
Likes: 1,171
From: Keswick, Virginia
I installed it about an hour ago and took my girlfriend's 2019 A8 Stingray out for a spin. As promised, the car stays in V8 mode all the time (no more V4). I did not notice any increase in performance, but the car seemed to be more "consistent" or steady when driving in suburban traffic (could have been my imagination). On the highway, it straight up hauled *** when I stood down on the throttle.
It only has 1,500 miles on it so far, so I am not going to dog or beat on it -- but the Range device keeps the car running in a consistent manner without changing over to V4. It was very easy to do - just plug it into the OBD-II port. Since we are likely to put it away for several days, I suppose it is a good idea to unplug it to avoid any battery drain.
The Range AFM device has little blue LEDs on it, but they are not noticeable during the day. We may take the car out tonight after dark & then I will see if they are visible. On their web page, you can order green, blue, red or orange LEDs on your device. Nothing like personalizing it, huh?
The fuel mileage seems to be 1 or 2 mpg lower with the V4 mode disabled, but it will take some more driving to see the true effect of it.
It only has 1,500 miles on it so far, so I am not going to dog or beat on it -- but the Range device keeps the car running in a consistent manner without changing over to V4. It was very easy to do - just plug it into the OBD-II port. Since we are likely to put it away for several days, I suppose it is a good idea to unplug it to avoid any battery drain.
The Range AFM device has little blue LEDs on it, but they are not noticeable during the day. We may take the car out tonight after dark & then I will see if they are visible. On their web page, you can order green, blue, red or orange LEDs on your device. Nothing like personalizing it, huh?
The fuel mileage seems to be 1 or 2 mpg lower with the V4 mode disabled, but it will take some more driving to see the true effect of it.
Advanced
Joined: Sep 2017
Posts: 71
Likes: 33
From: O' Fallon MO
Thanks JK 23112, I just plugged mine in today. I too notice a more consistent driving dynamic. Before, it was hard to detect whether the hesitation or slight vibration was coming from the transmission, a wheel or tire or the V4 to V8 engine management. I must say the AFM seems to have solved the slight vibration issue.
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Moderator emeritus
Joined: Jun 2001
Posts: 18,599
Likes: 3,955
From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
2015 C7 of the Year Finalist
I installed it about an hour ago and took my girlfriend's 2019 A8 Stingray out for a spin. As promised, the car stays in V8 mode all the time (no more V4). I did not notice any increase in performance, but the car seemed to be more "consistent" or steady when driving in suburban traffic (could have been my imagination). On the highway, it straight up hauled *** when I stood down on the throttle.
It only has 1,500 miles on it so far, so I am not going to dog or beat on it -- but the Range device keeps the car running in a consistent manner without changing over to V4. It was very easy to do - just plug it into the OBD-II port. Since we are likely to put it away for several days, I suppose it is a good idea to unplug it to avoid any battery drain.
The Range AFM device has little blue LEDs on it, but they are not noticeable during the day. We may take the car out tonight after dark & then I will see if they are visible. On their web page, you can order green, blue, red or orange LEDs on your device. Nothing like personalizing it, huh?
The fuel mileage seems to be 1 or 2 mpg lower with the V4 mode disabled, but it will take some more driving to see the true effect of it.
It only has 1,500 miles on it so far, so I am not going to dog or beat on it -- but the Range device keeps the car running in a consistent manner without changing over to V4. It was very easy to do - just plug it into the OBD-II port. Since we are likely to put it away for several days, I suppose it is a good idea to unplug it to avoid any battery drain.
The Range AFM device has little blue LEDs on it, but they are not noticeable during the day. We may take the car out tonight after dark & then I will see if they are visible. On their web page, you can order green, blue, red or orange LEDs on your device. Nothing like personalizing it, huh?
The fuel mileage seems to be 1 or 2 mpg lower with the V4 mode disabled, but it will take some more driving to see the true effect of it.
The new Range plugs will not draw on the battery with the engine off. When all the LEDs are dark, there is no draw.
Elmer
Drifting
Joined: Jan 2008
Posts: 1,558
Likes: 180
From: Payson AZ
No Issues Found
Action Suggested
Immediate Attention
DIAGNOSTIC INFORMATION
Engine and Transmission System
Emissions System
Air Bag System
StabiliTrak® Stability Control System
Antilock Braking System
REQUIRED MAINTENANCE
Vehicle Maintenance
Le Mans Master
Joined: Oct 2014
Posts: 8,680
Likes: 2,729
From: Atlanta GA
Le Mans Master
Joined: Oct 2014
Posts: 8,680
Likes: 2,729
From: Atlanta GA
If it leaves no crumbs then why unplug it and drive 200 miles before a service? Asking for a friend.
I think there is some mis information here. I don’t believe it’s going to affect warranty or the engine at all. A manual seven speed transmission keeps it in V8 mode all the time so what’s the problem?
I think there is some mis information here. I don’t believe it’s going to affect warranty or the engine at all. A manual seven speed transmission keeps it in V8 mode all the time so what’s the problem?
Dave
Heel & Toe
Joined: Feb 2017
Posts: 19
Likes: 7
From: Westlake OH
Purchased earlier this week and installed yesterday. Took a long cruise and immediately wondered why I didn't make this one of my first mods. The slight "hunting" one feels
when the AFM system constantly switches back and forth from V4 to V8 (mostly in city driving, obviously) has vanished. There is also a noticeable burble from the NPP on
deceleration that was definitely not there before. While I wasn't able to compile any mileage differential on just one cruise, I'm willing to accept the 1 to 3 MPG loss that has
been documented here in the forums. Only question I have for long-time users; is it worth it to remove the Range for long drives (6 hours or more) to maximize MPG and
plug it back in when you've arrived at your destination? Thanks in advance for feedback and if you're on the fence about purchasing one of these, I'd highly recommend it!
when the AFM system constantly switches back and forth from V4 to V8 (mostly in city driving, obviously) has vanished. There is also a noticeable burble from the NPP on
deceleration that was definitely not there before. While I wasn't able to compile any mileage differential on just one cruise, I'm willing to accept the 1 to 3 MPG loss that has
been documented here in the forums. Only question I have for long-time users; is it worth it to remove the Range for long drives (6 hours or more) to maximize MPG and
plug it back in when you've arrived at your destination? Thanks in advance for feedback and if you're on the fence about purchasing one of these, I'd highly recommend it!
Le Mans Master
Joined: Oct 2014
Posts: 8,680
Likes: 2,729
From: Atlanta GA
I cant be bothered for a few MPG , first thing I bought and I am not taking the chance on getting the torque converter "shudder" now at 42,000 .
I leave it in and forget about it . Around town with some very spirited driving I get 20 mpg on the highway its consistent 25 ....
Dave
I leave it in and forget about it . Around town with some very spirited driving I get 20 mpg on the highway its consistent 25 ....
Dave
