03-30-2018, 01:02 PM | #1 |
Drives: 2013 2SS M6 Join Date: Mar 2018
Location: USA
Posts: 76
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Can I restore NPP exhaust functionality with a tune?
I'm going to say something I never thought I would: My car is too loud. After getting offroad headers and a cam, I need to quiet it down, at least in the mornings. My car is equipped with the factory NPP exhaust, but the previous owner did something to keep them open. The only way I know of to do this is by pulling fuse F8 in the trunk fuse box. I checked today, and that fuse is still there. Did the previous owner do something else to keep it open? Maybe a tune? Can I get it retuned to restore that to factory functionality?
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03-30-2018, 01:11 PM | #2 |
Drives: 2015 SW 2SS 1LE Join Date: Jan 2018
Location: 78155
Posts: 308
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Try pressing the garage door buttons with the car idling and see if it quiets down with one of them. That's how I have mine.G/L
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03-30-2018, 01:14 PM | #3 |
Drives: 2013 2SS M6 Join Date: Mar 2018
Location: USA
Posts: 76
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03-30-2018, 01:47 PM | #4 |
Drives: 2015 BLK/BLK 2SS/RS MN6 Join Date: Oct 2016
Location: New Hampshuh
Posts: 266
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Have you pulled fuse 8 to see if there is any difference?
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03-30-2018, 02:17 PM | #5 |
Drives: 2014 1SS/1LE Join Date: Nov 2015
Location: Louisville, KY
Posts: 823
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Under normal operation, the flaps will stay open at idle unless you wire a three-position switch to force them closed.
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03-30-2018, 02:31 PM | #6 |
Drives: 2013 2SS M6 Join Date: Mar 2018
Location: USA
Posts: 76
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What? I thought they were closed at idle and opened up at 3k RPM. Isn't the purpose to keep it quite when you start it in the morning, or in a neighborhood?
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03-30-2018, 02:38 PM | #7 |
Drives: 2015 SW 2SS 1LE Join Date: Jan 2018
Location: 78155
Posts: 308
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Order the Forza 3 way controller and program it to the garage buttons
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03-30-2018, 02:46 PM | #8 |
Drives: 2015 1LE Join Date: Oct 2015
Location: Cleveland, OH
Posts: 1,485
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NPP is OPEN at idle and closes when the vehicle starts to accelerate until around 3500 rpm then it opens again.
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03-30-2018, 02:52 PM | #9 |
Drives: 2014 2SS RS, 6 sp man Join Date: Feb 2016
Location: Marlton, NJ
Posts: 461
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Yep what he said. Open at idle and closes on mine about 15-20 MPH at slow accelerations. Get on it and it opens. Get the Forza 3 way and in the morning you can close the flap and open it when you want or select the factory setting. The only time I close mine is startup in the morning and If I have the backseat down sometimes you can hear drone. You can look in the pipe and see if the flap is closed.
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03-30-2018, 03:13 PM | #10 |
Drives: 2014 1SS/1LE Join Date: Nov 2015
Location: Louisville, KY
Posts: 823
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I wired in my own three position switch following this diagram...
http://www.camaro5.com/forums/showpo...44&postcount=9 |
03-30-2018, 03:28 PM | #11 | |
Drives: 2010 Camaro SS/RS Join Date: Mar 2014
Location: somewhere in MD
Posts: 4,884
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Quote:
if you want the system to function like the Corvette system then you can run your own vacuum lines and use a C3 Corvette headlight switch to control it all.
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2010 2SS/RS
Z/28 intake, NW, FAST 102, speed engineering LT's, some exhaust, ATI -10% pulley, GM flex fuel injectors, DSX flex fuel sensor, MGW shifter, HP Tuners, some suspension work, stickers and a little weight loss. 12.63 @113.53 |
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03-30-2018, 10:07 PM | #12 |
Drives: 2010 Inferno Orange 2SS/RS Join Date: Apr 2010
Location: Clermont, IN
Posts: 3,297
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Or add cats....
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2010 Inferno Orange 2SS/RS M6 Black Leather, Sun Roof, OBX Headers, Borla touring axle back, Cold Air Inductions CAI , non synthetic fluids, BMR total bushing upgrade/1" lowering springs, DSE 32mm rear sway bar. GM fe4 shocks/struts/LCA's, AAM 3.91 diff, Vertini RFS1.8 20x9 +30. Conti ExtremeContact Sport 275/35/20. sjm autoprod ABL dash kit. Mike Norris tuned 413/419.
Avenging Orange: 43 years of not buying into the Hype........and damn proud of it!! https://youtu.be/9JD9it6SmB8 https://youtu.be/xmelTlEzI34 KICKING CANCERS ASS SINCE 2015!! |
03-31-2018, 03:38 AM | #13 |
Drives: Ashen grey, 1SS, L99 Join Date: Aug 2016
Location: Oklahoma
Posts: 527
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Roto-fab CAI, Nick Williams 102mm TB, LOD X1 V3 intake manifold, GMPP LS3 heads, Night Fury cam, TSP 2” long tubes, Corsa ZL-1 catback, Nitrous Outlet 102mm plate kit/150 shot, NGK BR7EF plugs with Taylor plug wires, DSX flex fuel kit, ZL-1 fuel pump and injectors, B&M deep trans pan, Yank 3400 converter, 3.45s with BMR Delrin bushings, mishimoto 169° Thermostat, GM ground effects, T-Rex upper grill, Z/28 Spoiler, Lolly pop Lime brake calipers, ZL1 10 spoke wheels, 12” subwoofer, and custom paint matched interior.
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03-31-2018, 06:09 AM | #14 | |
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Quote:
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Tags |
exhaust, loud, muffler, npp, tune |
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