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04-23-2018, 10:49 PM
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#1 |
 
Drives: 2019 Jeep Rubicon Sold:2017 ZL1 A10 Join Date: Feb 2017
Location: Scappoose, OR
Posts: 560
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NPP Exhaust Question
Got kicked off the track for being to loud. 108DP, Limit is 104DP. Car has 2" kooks with no cats into the factory suitcase. Does any one know if there is a way to do a mod so the valves stay slightly closed under full throttle. I tried putting the exhaust in tour but full throttle over ridded that thought. Any ideas would be great! I would like to do late night drags at the local track but not changing my setup
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Travis
SOLD ZL1 Summit White, A10, Black Strip, PDR, ZL1 floor mats Ordered 2/11, 2000 2/14, 3000 2/20, 3100 2/24, 3300 3/7, 3400 3/8, 4300 3/16, 4B00 3/21 Bayed at train yard in Ohio, 4200 3/26 All Abroad for the West Coast, 4800 4/4 Deliverd to portland train yard, 5000 4/7 3:00AM Deliverd to Dealer, 6000 4/7 6:45PM Delivered to Customer |
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04-23-2018, 11:31 PM
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#2 |
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Account Suspended
Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011
Location: St. Charles, IL
Posts: 18,663
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That's rough. Stock mufflers and you're getting kicked off the track. I'm sure you can rig something up so they don't open all the way.
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04-24-2018, 01:04 AM
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#3 |
 
Drives: 2013 2LT RS, 2017 ZL1 Join Date: Jan 2013
Location: Houston, TX
Posts: 479
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Move to one of the free states
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04-24-2018, 08:14 AM
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#4 |
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Thank you Al Oppenheiser!
Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017
Location: Sarasota, FL
Posts: 4,994
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Well you could hard wire a +12v key-on bypass to the valves from a via a switch in the trunk.
No idea whether lots of WOT with NPP closed will do Bad_Things(TM) to the car... |
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04-24-2018, 08:47 AM
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#5 |
 
Drives: 17 ZL1 MBM M6 Join Date: Mar 2017
Location: Oregon
Posts: 101
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Wow, they kick you from the track? There was a ton of really loud cars there. How many runs did you get in? I got four in, but I am pretty much all stock except K&N air filter. I left pretty much after we talked and didn't get a chance to watch you, PIR was getting extremely busy.
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04-24-2018, 08:52 AM
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#6 | |
       
Drives: 2SS 1LE Join Date: Oct 2011
Location: AK
Posts: 2,303
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Quote:
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Everything happens for a reason, except when it doesn't, but even then, you can, in hindsight, fabricate a reason that satisfies your belief system.
2018 2SS 1LE 2023 Colorado ZR2 2022 Stinger GT-line AWD |
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04-24-2018, 08:53 AM
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#7 |
Drives: 2013 C6Z06 Join Date: Nov 2016
Location: PA
Posts: 1,577
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Put cats on your car that will quiet it down. Or pull the exhaust fuse and weld the valves partly shut to your desired dB level. Or make up some reducing tips that you could just clamp on the outer pipes maybe for ease of reversal.
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04-24-2018, 09:53 AM
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#8 |
Drives: Fast Join Date: Mar 2015
Location: Michigan
Posts: 3,696
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Laguna pipes?
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04-24-2018, 10:26 AM
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#9 |
Drives: 2017 ZL1 Join Date: Mar 2014
Location: DFW, TX
Posts: 302
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Is the non-powered position of the valves open or closed?
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04-24-2018, 10:29 AM
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#10 |
Drives: 2017 Camaro 2SS Join Date: Mar 2017
Location: Portland/Vancouver
Posts: 410
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PIR?
i was afraid to hear this... i have same setup and was concerned about them booting me. My car is LOUD. How did you run?
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2017 NGM 2SS NPP M6 MRC Vortech SC, 2" TSP LT No Cats, Borla X, Eibach, Hurst shifter 603hp/547tq |
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04-24-2018, 10:31 AM
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#11 | |
Drives: 2016 2SS, Summit White, A8, NPP Join Date: Apr 2013
Location: Arkansas
Posts: 717
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04-24-2018, 10:34 AM
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#12 |
Drives: 2012 Porsche 911 Turbo S Join Date: Jan 2017
Location: Los Angeles, CA
Posts: 1,776
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I'd put on the green cats. I bet that would get you down the couple db you need
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IG: 2fast2nick
-- Current -- 2012 Porsche Turbo S - PDK - Basalt Black Metallic -- Past -- 2017 Camaro ZL1 Coupe - Red Hot - A10, PDR - HRE P101 2015 Mustang GT PP - Whipple Supercharger |
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04-24-2018, 11:30 AM
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#13 |
Drives: 2018 ZL1 1LE (2)79Z28 72RS 67SS 69Z Join Date: May 2009
Location: Arizona
Posts: 422
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Maybe try a resonator that can be easily removed
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04-24-2018, 11:52 AM
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#14 | |
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Camaro pilot
Drives: 69 Camaro, 2014 ZL1 Join Date: Dec 2015
Location: Medford OR
Posts: 299
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Quote:
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2014 ZL1 Camaro
1969 Camaro  |
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