Exhaust
Instructor
Joined: Jun 2013
Posts: 193
Likes: 1
From: NY
Safety Car
Joined: Oct 2003
Posts: 3,939
Likes: 14
From: Baltimore Md.
Racer
Joined: Apr 2010
Posts: 379
Likes: 2
From: Naples FL
Instructor
Joined: Jun 2013
Posts: 193
Likes: 1
From: NY
Race Director
Joined: Jun 2001
Posts: 10,084
Likes: 3,055
From: CA
I wish there was another option OFF (or NIGHT mode 
), for driving through residential area canyons at night. There's no use getting everyone riled up just because someone wants to go fast in a C7.
Michael
), for driving through residential area canyons at night. There's no use getting everyone riled up just because someone wants to go fast in a C7.Michael
Drifting
Joined: Sep 2013
Posts: 1,505
Likes: 13
Directly from GM literature
Exhaust Tailpipe Flow Control Valve System — RPO NPP:
The exhaust tailpipe flow control system is used to tune the exhaust note for high performance vehicles. This vehicle is equipped with two tailpipe exhaust valves. One in the left tailpipe and one in the right tailpipe. Each exhaust tailpipe valve is installed in the low restriction exhaust path of a dual outlet muffler, near the exhaust tip.
When a tailpipe exhaust valve is open, the low restriction exhaust path is opened to the atmosphere, and the exhaust note becomes more aggressive.
An output circuit from the chassis control module is used to control the actuator that opens the left and right exhaust tailpipe valves. The exhaust flow control valve opens and closes when the chassis control module commands the actuator by pulse width modulation of the control signal.
To provide a more aggressive exhaust note when the vehicle is started, the exhaust tailpipe valves are opened during an engine crank event during specific modes of operation if that option is available. Once the engine is running, accelerator pedal position, transmission gear and engine speed are used to determine the commanded state (open or closed) of the exhaust tailpipe valves.
There are four specific exhaust performance modes that result in different behavior of the exhaust tailpipe valves. These modes are:
• Weather/Eco Mode: Exhaust tailpipe valves will be closed at all times when the engine is running.
• Tour Mode: Exhaust tailpipe valves are closed when the engine is idling and during normal/non-aggressive driving. Valves open during aggressive driving.
• Sport Mode: Exhaust tailpipe valves are open when the engine is idling and during most driving scenarios.
• Track Mode: Exhaust tailpipe valves are open at all times.
It is possible to personalize the exhaust sound. Select the Driving Mode menu and the following will be displayed:
• Exhaust
• Steering
Select Exhaust. This controls how robust or quiet the engine will sound. Select:
• Auto
• Stealth
• City
• Tour
• Sport
• Track
• Off
When the engine sound enhancement is turned Off via the personalization menu, the exhaust tailpipe valves will be put into track mode no matter which vehicle mode (Weather/Eco, Tour, Sport, or Track) is displayed on the drivers instrument panel.
The exhaust tailpipe flow control system is used to tune the exhaust note for high performance vehicles. This vehicle is equipped with two tailpipe exhaust valves. One in the left tailpipe and one in the right tailpipe. Each exhaust tailpipe valve is installed in the low restriction exhaust path of a dual outlet muffler, near the exhaust tip.
When a tailpipe exhaust valve is open, the low restriction exhaust path is opened to the atmosphere, and the exhaust note becomes more aggressive.
An output circuit from the chassis control module is used to control the actuator that opens the left and right exhaust tailpipe valves. The exhaust flow control valve opens and closes when the chassis control module commands the actuator by pulse width modulation of the control signal.
To provide a more aggressive exhaust note when the vehicle is started, the exhaust tailpipe valves are opened during an engine crank event during specific modes of operation if that option is available. Once the engine is running, accelerator pedal position, transmission gear and engine speed are used to determine the commanded state (open or closed) of the exhaust tailpipe valves.
There are four specific exhaust performance modes that result in different behavior of the exhaust tailpipe valves. These modes are:
• Weather/Eco Mode: Exhaust tailpipe valves will be closed at all times when the engine is running.
• Tour Mode: Exhaust tailpipe valves are closed when the engine is idling and during normal/non-aggressive driving. Valves open during aggressive driving.
• Sport Mode: Exhaust tailpipe valves are open when the engine is idling and during most driving scenarios.
• Track Mode: Exhaust tailpipe valves are open at all times.
It is possible to personalize the exhaust sound. Select the Driving Mode menu and the following will be displayed:
• Exhaust
• Steering
Select Exhaust. This controls how robust or quiet the engine will sound. Select:
• Auto
• Stealth
• City
• Tour
• Sport
• Track
• Off
When the engine sound enhancement is turned Off via the personalization menu, the exhaust tailpipe valves will be put into track mode no matter which vehicle mode (Weather/Eco, Tour, Sport, or Track) is displayed on the drivers instrument panel.
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Instructor
Joined: Jun 2013
Posts: 193
Likes: 1
From: NY
There are NOW just TWO options....#1 is AUTO (factory setting) Changes with the drive mode that you are in.
#2 is OFF which is LOUD in ALL modes.
That is it NO other options !
You could drive in Weather/Eco Mode: Which is the quietest.
Last edited by C7 101 car; Oct 13, 2013 at 11:37 PM.
Tech Contributor
Joined: Sep 2008
Posts: 10,954
Likes: 261
From: Greensboro NC
2015 C6 of the Year Finalist
If you get the Mild-to-Wild mod, you can control when it is always open with a remote control switch.
That way you can have it always open if you want it loud or revert to the RPM controlling it (Mild mode - only opens at 3500 RPM).
In mild mode you can drive conservatively through the neighborhood at night and no one will notice you.
That way you can have it always open if you want it loud or revert to the RPM controlling it (Mild mode - only opens at 3500 RPM).
In mild mode you can drive conservatively through the neighborhood at night and no one will notice you.
Thread Starter
Drifting
Joined: Oct 2013
Posts: 1,332
Likes: 750
If you get the Mild-to-Wild mod, you can control when it is always open with a remote control switch.
That way you can have it always open if you want it loud or revert to the RPM controlling it (Mild mode - only opens at 3500 RPM).
In mild mode you can drive conservatively through the neighborhood at night and no one will notice you.
That way you can have it always open if you want it loud or revert to the RPM controlling it (Mild mode - only opens at 3500 RPM).
In mild mode you can drive conservatively through the neighborhood at night and no one will notice you.
Le Mans Master
Joined: Jul 2005
Posts: 6,350
Likes: 273
From: Hoschton Georgia
Pro
Joined: Dec 2010
Posts: 529
Likes: 11
From: Troutman NC