New C7 Automatic question
Thread Starter
Instructor
Joined: Oct 2006
Posts: 194
Likes: 9
From: Eugene OR
New C7 Automatic question
Picked up my new '15 Torch Red convertible, Z51, last Wednesday. It's an automatic, and I experienced what I think is a bit weird when I drove it off the lot. First, I loved the sound when starting up. Problem is when it shifted into 3rd or 4th, the NPP shut off. When that sound went away I wasn't happy. First, is this normal?? Then if it is, why?? I want to hear my exhaust all the time so this is very disappointing.
This replaced a 2011 Grand Sport with NPP, and it was easy to just install a mild to wild. Best of both worlds. On for me...............off for my wife. So last question is there a similar fix for the C7?? I was thinking of just trying out the mild to wild from the GS, but thought I'd find out what you all think.
By the way, I think the C7 is an absolutely phenominal car. Love the way it rides and drives, and of course it's absolutely beautiful
Thanks for any help. Stan
This replaced a 2011 Grand Sport with NPP, and it was easy to just install a mild to wild. Best of both worlds. On for me...............off for my wife. So last question is there a similar fix for the C7?? I was thinking of just trying out the mild to wild from the GS, but thought I'd find out what you all think.
By the way, I think the C7 is an absolutely phenominal car. Love the way it rides and drives, and of course it's absolutely beautiful
Thanks for any help. Stan
Melting Slicks
Joined: Jun 2004
Posts: 2,130
Likes: 54
From: Granbury, Pecan Plantation TX
Picked up my new '15 Torch Red convertible, Z51, last Wednesday. It's an automatic, and I experienced what I think is a bit weird when I drove it off the lot. First, I loved the sound when starting up. Problem is when it shifted into 3rd or 4th, the NPP shut off. When that sound went away I wasn't happy. First, is this normal?? Then if it is, why?? I want to hear my exhaust all the time so this is very disappointing.
This replaced a 2011 Grand Sport with NPP, and it was easy to just install a mild to wild. Best of both worlds. On for me...............off for my wife. So last question is there a similar fix for the C7?? I was thinking of just trying out the mild to wild from the GS, but thought I'd find out what you all think.
By the way, I think the C7 is an absolutely phenominal car. Love the way it rides and drives, and of course it's absolutely beautiful
Thanks for any help. Stan
This replaced a 2011 Grand Sport with NPP, and it was easy to just install a mild to wild. Best of both worlds. On for me...............off for my wife. So last question is there a similar fix for the C7?? I was thinking of just trying out the mild to wild from the GS, but thought I'd find out what you all think.
By the way, I think the C7 is an absolutely phenominal car. Love the way it rides and drives, and of course it's absolutely beautiful
Thanks for any help. Stan
Whit that said the are great cars and around town I don't need to hear the exhaust, even though it dose sound good.
Burning Brakes
Joined: Oct 2002
Posts: 1,176
Likes: 263
From: Henderson, Nevada Nevada
New C7 Automatic question
Yeah this is the AFM (Active Fuel Management) kicking in. There's a device called the Range AFM disabler that is available to defeat this. I don't have any personal experience with it but owners seem happy.
When I get my C7 I may buy one if the AFM bugs me.
When I get my C7 I may buy one if the AFM bugs me.
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
Mine will not allow the exhaust to be open in V4 (AFM) mode, but it will also close when different gears engage, which one depending on the mode selected. You can set three parameters of the Driving Mode in the Settings section: Engine Sound Mgt. (exhaust), cluster display, and steering. For example, I have exhaust set to Sport on mine, so it stays there regardless of which Driving Mode is selected.
How long it stays open (loud) and under what conditions the flaps close depends on the mode. The only difference I've noticed between Sport and Track mode is that the flaps close (quiet) when the A8 shifts into fourth gear for Sport and fifth gear for Track. Also, mine is quiet in all modes at idle except Sport and Track. If you want the exhaust flaps to stay open all the time just pull the NPP fuse (#41 for 2014, #42 for 2015), but it will drone at cruising speeds. I haven't tried it but know this would grate on my nerves in short order.
How long it stays open (loud) and under what conditions the flaps close depends on the mode. The only difference I've noticed between Sport and Track mode is that the flaps close (quiet) when the A8 shifts into fourth gear for Sport and fifth gear for Track. Also, mine is quiet in all modes at idle except Sport and Track. If you want the exhaust flaps to stay open all the time just pull the NPP fuse (#41 for 2014, #42 for 2015), but it will drone at cruising speeds. I haven't tried it but know this would grate on my nerves in short order.
Last edited by iclick; Jul 1, 2015 at 09:21 PM.
Drifting
Joined: Apr 2013
Posts: 1,743
Likes: 453
From: Saint Clair Shores Mi
Mine will not allow the exhaust to be open in V4 (AFM) mode, but it will also close when different gears engage, which one depending on the mode selected. You can set three parameters of the Driving Mode in the Settings section: Engine Sound Mgt. (exhaust), cluster display, and steering. For example, I have exhaust set to Sport on mine, so it stays there regardless of which Driving Mode is selected.
How long it stays open (loud) and under what conditions the flaps close depends on the mode. The only difference I've noticed between Sport and Track mode is that the flaps close (quiet) when the A8 shifts into fourth gear for Sport and fifth gear for Track. Also, mine is quiet in all modes at idle except Sport and Track. If you want the exhaust flaps to stay open all the time just pull the NPP fuse (#41 for 2014, #42 for 2015), but it will drone at cruising speeds. I haven't tried it but know this would grate on my nerves in short order.
How long it stays open (loud) and under what conditions the flaps close depends on the mode. The only difference I've noticed between Sport and Track mode is that the flaps close (quiet) when the A8 shifts into fourth gear for Sport and fifth gear for Track. Also, mine is quiet in all modes at idle except Sport and Track. If you want the exhaust flaps to stay open all the time just pull the NPP fuse (#41 for 2014, #42 for 2015), but it will drone at cruising speeds. I haven't tried it but know this would grate on my nerves in short order.
Le Mans Master
Joined: Feb 2002
Posts: 9,883
Likes: 518
From: Bergen County NJ
I have the #42 fuse pulled and have had it this way for quite some time. I also have an A8. I don't think there is really too much drone at cruising speeds, but; What is really annoying is the AFM valves opening and closing all the time. During a long road trip a couple months ago I just drove in "manual mode" and the exhaust sounded fine until I got into hilly/mountain area and the car kind of lugged a little in 8th going uphill at 60/65. I started using paddles to drop a gear. Finally at a gas stop I just gave up and put the fuse back in and set the sound to Track and drove the rest of the trip. All in all, my opinion; Fuse out around town and for a little spirited driving it works great. On long highway trips with the A8; it sucks. I'm aware of the tune trim that shuts off the AFM, but just don't want to screw with it and the unintended problems that may come up.
Pro
Joined: Jul 2014
Posts: 602
Likes: 119
From: Southern Ontario
It was done to avoid the highway drone with this exhaust, personally I prefer it this way but to each their own. My last sports car had a high performance exhaust and the drown at highway speed got old pretty quick. Great around town but not what I want to hear at cruise speeds hour after hour.
Here some info on how that setup works...
https://www.corvetteforum.com/forums...ck-result.html
Here some info on how that setup works...
https://www.corvetteforum.com/forums...ck-result.html
Last edited by C7DriverOnt; Jul 2, 2015 at 10:29 AM. Reason: add link
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Racer
Joined: Aug 2004
Posts: 267
Likes: 5
From: Monmouth County NJ
Just an FYI - AutoAnything.com has 20% off the Range Technology AFM disabler . I had to call them because their ordering system rejected the discount code , but they honored it. So for under 160.00 shipped to your door, the problem is solved.