Stealth mode for exhaust
Thread Starter
Melting Slicks
Joined: Nov 2013
Posts: 2,048
Likes: 29
From: Palm Beach County FL
Stealth mode for exhaust
Can a '15 owner tell me what the stealth mode does on NPP? I always thought it was tour or sport. Apparently there is also a eco/stealth mode that I just found out.
Is it actually quieter than tour mode?
Don't think I'll ever use it... Just curious.
Thanks!
Is it actually quieter than tour mode?
Don't think I'll ever use it... Just curious.
Thanks!
Instructor
Joined: Jun 2014
Posts: 242
Likes: 4
"Engine Sound Management
This allows the Engine Sound
Management feature to be turned
on or off.
Select Auto (Mode Selector) or Off."
Note that there is no "Stealth" mode documented in the instructions in the manual or in the car's actual Settings interface. I would be curious if anyone has a 2015 with different/additional settings for the NPP exhaust.
Safety Car
Joined: Jun 2008
Posts: 4,610
Likes: 427
From: USA
I'm curious if there are different versions of NPP that have been rolled out into production through time. My 2015 C7 has only two modes for exhaust settings, AUTO or OFF. This is as is documented in the 2015 owners manual on page 5-47 which reads:
"Engine Sound Management
This allows the Engine Sound
Management feature to be turned
on or off.
Select Auto (Mode Selector) or Off."
Note that there is no "Stealth" mode documented in the instructions in the manual or in the car's actual Settings interface. I would be curious if anyone has a 2015 with different/additional settings for the NPP exhaust.
"Engine Sound Management
This allows the Engine Sound
Management feature to be turned
on or off.
Select Auto (Mode Selector) or Off."
Note that there is no "Stealth" mode documented in the instructions in the manual or in the car's actual Settings interface. I would be curious if anyone has a 2015 with different/additional settings for the NPP exhaust.
Pro
Joined: Feb 2014
Posts: 720
Likes: 3
From: Sherman Oaks CA
Mine is a 2015 also. There is a specific setting on my touch screen that says stealth, tour, sport and track. Stealth and tour sound pretty much the same to me. Track and sport also sound the same to me but track seems to be a little louder when shifting. I definitely have more than just the two options on mine.
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Burning Brakes
Joined: Jun 2014
Posts: 981
Likes: 157
IIRC, the salesman told me the '14 NPP doesn't close the "quiet" valve until just after engine start, so you'll get a quick bark form the exhaust on startup. Is this true? For '15, too?
Does the stealth mode kick in before the engine is started so you don't get the bark?
Does the stealth mode kick in before the engine is started so you don't get the bark?
Race Director
Joined: Sep 2013
Posts: 11,825
Likes: 2,477
From: Ft Lauderdale
Tech Contributor
Thread Starter
Melting Slicks
Joined: Nov 2013
Posts: 2,048
Likes: 29
From: Palm Beach County FL
Thanks guys...
Glen, so does it override the settings or something? so when it's in stealth mode, it will be quiet even in track.
I don't see how this is any diff than putting it on "off" with the '14s
I was thinking like stealth closes all the valves all the time. Tour opens one up if you accelerate or something, and sport will open both on acceleration with track keeping them open all the time.
Again... I have no idea. Was just speculating lol
Glen, so does it override the settings or something? so when it's in stealth mode, it will be quiet even in track.
I don't see how this is any diff than putting it on "off" with the '14s
I was thinking like stealth closes all the valves all the time. Tour opens one up if you accelerate or something, and sport will open both on acceleration with track keeping them open all the time.
Again... I have no idea. Was just speculating lol
Race Director
Joined: Sep 2013
Posts: 11,825
Likes: 2,477
From: Ft Lauderdale
Tech Contributor
as I understand it, the valve stay closed (quiet) in all modes, no matter what the car is doing or you are doing to the car...hence the name "stealth"...
like I said, this is essentially the opposite of "off" (loud) which locks the valves open all the time (except from some cruising situations)
like I said, this is essentially the opposite of "off" (loud) which locks the valves open all the time (except from some cruising situations)
Race Director
Joined: Sep 2013
Posts: 11,825
Likes: 2,477
From: Ft Lauderdale
Tech Contributor
This feature has been discussed for a year here. You certainly dont need to own a 15 to understsnd it. It was supposed to be on 14’s and in the sales training at spring mountain last year. Its even in print in the 2014 sales guide, in addition to a " city" mode.
Safety Car
Joined: Jun 2008
Posts: 4,610
Likes: 427
From: USA
As previously stated, I keep mine in track mode all the time because I like the sound, but I have changed it numerous times to show other people how it works and just playing with it. I still kinda think it may truly be bimode exhaust with sport and track being the same and stealth and tour being the same. I don't see a whole lot of difference in those when messing with it....especially tour and stealth. They sound exactly the same on idle and revving.
Race Director
Joined: Sep 2013
Posts: 11,825
Likes: 2,477
From: Ft Lauderdale
Tech Contributor
The system is simple, it is either open or closed. It is closed (quiet) for eco, weather and touring. It is open (loud) for sport and track. It can be locked open for all modes "off" and closed for all modes (stealth)