10-06-2020, 06:57 PM | #1 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
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Npp valve actuator mod.
Today I decided to mod the NPP actuators on my exhaust per the latest TSB that is suppose to fix the "rattle". I never noticed much rattle with my Flowmaster NPP but I wanted to try it to see if it would help the valves seal better when closed.
It requires using a cut-off wheel and cutting off the ears on one side of the actuator. https://www.camaro6.com/forums/showthread.php?t=556061 Surprisingly this really works. The exhaust note sounds cleaner when closed and even notice a difference open. I highly suggest doing this no matter what type of NPP exhaust you have. Thanks to 6spdHyperblue for mentioning this a while back!!
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
10-08-2020, 09:11 PM | #2 | |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,614
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Quote:
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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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10-09-2020, 08:27 AM | #3 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
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Yep.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
10-09-2020, 12:07 PM | #4 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,614
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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 |
10-09-2020, 03:48 PM | #5 |
Drives: 2017 2SS F1FTY Join Date: Feb 2020
Location: Fort Wayne, IN
Posts: 347
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Will the dealer do this at no charge?
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10-11-2020, 07:12 PM | #6 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,614
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Project completed, valves still work (phew). I haven't yet driven the car since the mod, so I can't comment on improvement, if any.
One thing's for sure, though, a Martian with skinny, 10" fingers would have a much better time working on this stuff Of course I could've dropped the exhaust to make room, but come on.
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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 |
10-12-2020, 12:34 AM | #7 | |
Drives: 2017 2SS F1FTY Join Date: Feb 2020
Location: Fort Wayne, IN
Posts: 347
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Quote:
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10-12-2020, 08:53 AM | #8 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
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There is a TSB for it, so they should of you have the rattle but they only do the passenger side.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
10-12-2020, 02:19 PM | #9 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,614
|
Not yet, it's been raining since yesterday evening, forecast is the same for tomorrow, I just used the family SUV. Will post back with findings.
The rattle on mine wasn't super bad, but you know how it is, our butts can't stay put with an open TSB and tools waiting to be handled
__________________
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 |
10-14-2020, 04:40 PM | #10 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,614
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Okay, after driving the car about 15 miles, tinkering with settings while paying specific attention to the exhaust, the fix seems to have really worked. Might be placebo, as I didn't measure anything with instruments, but the exhaust note is now much "cleaner", same tone but fewer "disturbances" both with the valves shut and open, it feels as if the exhaust was new again. Hope this makes sense.
One can only wonder how the GM engineer in charge of this came up with the idea for the fix
__________________
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 Last edited by arpad_m; 10-14-2020 at 11:09 PM. |
10-15-2020, 06:50 AM | #11 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
|
I wondered the same thing. Lol
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
01-21-2022, 09:38 PM | #12 | |
Quote:
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2018 Camaro 1SS | BBK 92mm TB | GPI Ported LT1 Manifold | ColdAirInductions CAI | Granatelli Wires and MSD coils | Mishimoto Catch Can | GMP Black Strut Tower Brace | NPP Exhaust and 2nd Cat Delete | Recaro Seats | GM Stainless Sport Pedal Kit | GM Carbon Fiber Shift Knob | Deck Lid Spoiler with Wicker Bill | Smoked Sequential Taillights | Smoked Third-Brake Light | 1LE Front Splitter/Satin Black | ZL1Addons Splash Guards
2015 Camaro SS/RS (Sold) |
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01-22-2022, 07:52 AM | #13 |
Drives: 2018 2ss 1le Join Date: Jan 2018
Location: Huntington, NY
Posts: 474
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how do you tune the valves with hp tuners
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2018 2ss 1le roto fab dry, Stainless works 1 7/8 lt to 3'" x pipe with highflow cats to stock npp, soler 95mm t/b, edelbrock 2300, LT4 fueling , jms bap and dsx flex fuel, 618/620 on e45 rwhp
Jannetty Motorsports tuned |
01-22-2022, 09:56 AM | #14 |
Drives: 18 zl1 garnet red Join Date: Aug 2021
Location: TX
Posts: 287
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Anyone know if the TSB is still applicable for the 2021 1SS?
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