07-26-2020, 09:06 PM | #1 |
Drives: 2018 1SS 1LE Join Date: Jul 2020
Location: AZ
Posts: 160
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NPP open on startup?
I know asking this will be sacrilege but I like and respect my neighbors.
I have stock everything and it seems the startup is with the NPP open even if it's in the quieter modes. Is there a way to not make the thing abnormally loud on startup? A few seconds later it's quiet so why does the startup have to be so loud even in the quiet modes?
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2018 1SS 1LE Hyper Blue
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07-26-2020, 09:16 PM | #2 |
Drives: 2017 Silverado/2017 ZL1 Join Date: Aug 2019
Location: Jax/Palatka FL
Posts: 1,090
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Yea it seems to be open on startup regardless if you turn the accessories on before startup.
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07-26-2020, 09:50 PM | #3 |
Drives: 2019 2SS Crush Join Date: Jun 2020
Location: Denver, CO
Posts: 163
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Try putting it in stealth mode via the vehicle settings in the infotainment. See if it holds. I’ve never tried and always drive in track exhaust mode with comfort steering. Lol.
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07-26-2020, 10:17 PM | #4 |
Drives: 2021 Tesla Model 3 LR Join Date: May 2016
Location: USA
Posts: 964
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Stealth mode will be the only mode that will keep the valves closed during start up. Others will have them open.
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07-26-2020, 10:27 PM | #5 |
Drives: '17 2SS convertible'20 Yukon Denali Join Date: Nov 2011
Location: Cedar Park, Texas
Posts: 2,930
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From what I have heard before, you have to set it every time you start the car. It doesn't remember when you power it off.
Go into accessory mode by pushing the start button without your foot on the break. Then set the mode to stealth and start the car. Mine is a 2017 so it may be different in later models.
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Richard
2017 2SS SIM convertible, A8, NPP, MRC, 56R wheels, GM CAI, Diode Dynamics Side Markers Delivered: 08/15/2016 #TeamBeckyD |
07-26-2020, 10:52 PM | #6 |
Drives: like an old lady Join Date: Jun 2012
Location: indiana
Posts: 2,395
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i would swap neighbors before i swapped exhaust
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2016+ camaro: everyone’s first car
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07-26-2020, 11:09 PM | #7 | |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,574
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Quote:
Now, as an interesting thought experiment, I do see an option in the tune that allows defaulting the valve state to closed. Has anyone tried this by any chance?
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
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07-27-2020, 05:56 AM | #8 |
Drives: 2019 zl1 6 speed Join Date: Jul 2017
Location: Lake Havasu Arizona
Posts: 977
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If you have the car in stealth mode when you shut the car off, it will remain in stealth mode upon startup, and stay in stealth mode untill you manualy change it in the settings.
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07-27-2020, 06:50 AM | #9 |
Drives: 2018 1SS 1LE Join Date: Jul 2020
Location: AZ
Posts: 160
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Forgive my ignorance, what software is this?
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2018 1SS 1LE Hyper Blue
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07-27-2020, 07:45 AM | #10 |
Account Suspended
Drives: 18 1SS/1LE Join Date: Jun 2018
Location: Missouri
Posts: 939
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Stealth is still loud enough to be bothersome it's quiet a difference but it's still got a loud bark.
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07-27-2020, 07:49 AM | #11 |
Drives: 2016 Camaro 2SS Join Date: Apr 2018
Location: Central Texas
Posts: 1,011
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07-27-2020, 02:22 PM | #12 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,574
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Yes, it's HP Tuners.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
07-27-2020, 02:39 PM | #13 |
Drives: 2019 Chevrolet Camaro Join Date: Mar 2020
Location: Lantana, TX
Posts: 77
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Here is what I do. No matter what mode you park the car in you can do this and it works.
Get in car, hold down start button only, do not push brake and clutch. You will have to hold down the button for 5-6 seconds and the car will go into accessory mode. Everything will be alive like if the car was running. Now put the car into snow/winter mode using the selector. You will hear the valves close. Now brake, clutch and push the start button again. Car will start in stealth mode without having to actually go into menu and select stealth. Once you leave the neighborhood you click it back into sport or track and good to go. |
07-27-2020, 03:08 PM | #14 | |
Drives: 2016 2SS 8AT Join Date: May 2018
Location: Nevada
Posts: 358
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Quote:
Actually to only change the startup sound for the different modes its under exhaust rumble enable |
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