02-25-2019, 09:41 AM | #1 |
Drives: Camaro Join Date: Sep 2018
Location: USA
Posts: 520
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Rattle after headers installed
Got all my mods done & everything is great, but on cold start up it rattles. After it warms up in a few min. everything is fine. I've checked everything & the sound is coming from the rear of the exhaust. Is this the NPP or AFM valves. What can I do to fix this?
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02-25-2019, 10:03 AM | #2 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,797
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Could be either one or both. They are known to rattle. There is a epoxy fix for the NPP valves but it seems hit or miss. Best bet is to buy a X pipe, axle back, and replace the stock stuff. Factory NPP sounds good until you start changing stuff with it, then it tends to get raspy and rattles with any change in exhaust flow. Borla makes a X pipe with resonators that will help keep the sound under control if you have cat less headers.
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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 |
02-25-2019, 11:18 AM | #3 |
Drives: Camaro Join Date: Sep 2018
Location: USA
Posts: 520
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Great! Yes I have cat-less headers, guess I'll buy the rest of the exhaust system?
Do I just need the Borla X-pipe without the AFM valves & do I need to add the mufflers with or without NPP also. My tune is with AFM tuned off, I think the NPP is still in the tune. |
02-25-2019, 11:54 AM | #4 |
Drives: 2018 SS 1LE Join Date: May 2018
Location: Arizona
Posts: 292
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Is your exhaust touching the center cross member now?
I actually had to remove mine after the full exhaust install as even shimmed it barely touched when cold
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🌽 Sauced, 2018 SS 1LE - 123mph @ 5,000 DA
ARH 2”x3” FULL System, Pray Ported MSD Intake Manifold, Pray Ported GM 95mm TB, RotoFab CAI, DsX e85 Kit, MightyMouse Catch Can, NicD Tune https://instagram.com/corn_sauced?ut...d=o0ako89uurwl |
02-25-2019, 11:54 AM | #5 |
Drives: 6th gen Join Date: Aug 2013
Location: US
Posts: 3,675
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Im gonna try to weld a little nub of metal up against that ceramic part in the tip. I’m thinking to get rid of the slack in the valve. The epoxy didn’t work for me long term
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02-25-2019, 12:04 PM | #6 |
Drives: Camaro Join Date: Sep 2018
Location: USA
Posts: 520
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02-25-2019, 12:11 PM | #7 | |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,797
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Quote:
My recommendation if you want all Borla is to get the resonator X and Sport(Not Attack) axle back since you have headers. As JonD mentioned check your crossmember for clearance as that will cause a rattle you describe before getting too carried away.
__________________
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 |
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02-25-2019, 12:16 PM | #8 |
Drives: Camaro Join Date: Sep 2018
Location: USA
Posts: 520
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Awesome, thanks guys!
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03-01-2019, 11:26 AM | #9 | |
Drives: Camaro Join Date: Sep 2018
Location: USA
Posts: 520
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Quote:
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03-01-2019, 11:49 AM | #10 | |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,797
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Quote:
__________________
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 |
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03-01-2019, 11:56 AM | #11 | |
Drives: Camaro Join Date: Sep 2018
Location: USA
Posts: 520
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Quote:
Do you know where I can find this to disable, I'm still learning on my hptuners. |
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03-01-2019, 12:39 PM | #12 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,797
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It's under "System" tab. Should see a list of options for the exhaust...one will say AFM valves enable/disable.
__________________
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 |
03-01-2019, 08:17 PM | #13 |
Drives: Camaro Join Date: Sep 2018
Location: USA
Posts: 520
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Not there, can't find anything to disable AFM. I think I need to buy a credit to unlock the FSCM so I can disable AFM
Last edited by 18ss376; 03-01-2019 at 09:06 PM. |
03-02-2019, 12:12 AM | #14 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,797
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Yep you have to license the FSCM controller, but you should be able to read it and see the options before licensing
I would update HPT to the latest then read entire system(ECM/TCM/FSCM)
__________________
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 |
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