08-03-2020, 08:01 PM | #1 |
Drives: 2018 hyper blue ZL1 1LE Join Date: Nov 2018
Location: Alabama
Posts: 165
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Exhaust db
I have a zle with 2" kooks, green cats, 3" x pipe and stock suitcase muffler. I am looking at doing a track day at ncm with a max decibel of 103db at 50'. Can anyone with a similar set up give me an idea of max db I am making. Thanks.
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08-03-2020, 11:19 PM | #2 |
Drives: 2018 Hyper Blue ZL1 1LE Join Date: Dec 2018
Location: CA
Posts: 1,360
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My 100% stock ZLE makes well over 92 db even at ~3/4 throttle breaking sound booth 92 db limit repeatedly with high 90s at Laguna Seca (after 3 meatballs and weekend DQ, I switched numbers). With headers, green cats, etc you may be over 103, ZL1s are effing loud.
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08-04-2020, 08:28 AM | #3 |
Drives: 2020 Camaro ZL-1 1LE Join Date: Jul 2018
Location: Nashville
Posts: 211
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The NCM Mod
I had the same issue. I had to add a magnaflow X-Pipe muffler to get it down to meet ncm sound limit. Now it’s WOT off turn 3 with no problems. It will get it down 5 DBs easy. Do a lookup on the muffler as there are some nice posts with pics and part numbers.
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Home Track: NCM Motorsports Park
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08-04-2020, 08:47 AM | #4 |
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Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011
Location: St. Charles, IL
Posts: 18,663
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They get loud with headers for sure. First car we ever had come back for the stock manifolds was a ZLE. It was just to loud with the Flowmaster catback.
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08-04-2020, 11:46 AM | #5 |
Drives: 2018 hyper blue ZL1 1LE Join Date: Nov 2018
Location: Alabama
Posts: 165
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Hmm... So I knew these cars get loud. Barber didn't have a problem with my car, but I'm not sure if they have the strict noise rules of ncm. I may just go to road Atlanta or Arista Motorsports park for my next track day.
Do you know if it's from the right side or left side of the car that they measure at ncm? Is it from the side or the back? I may do a quick check with the spl meter on my phone to see how close I am. Thanks again everyone. Brad |
08-04-2020, 02:29 PM | #6 | |
Drives: 2013 C6Z06 Join Date: Nov 2016
Location: PA
Posts: 1,577
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Quote:
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08-04-2020, 02:58 PM | #7 | |
Drives: 2020 Camaro ZL-1 1LE Join Date: Jul 2018
Location: Nashville
Posts: 211
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Quote:
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Home Track: NCM Motorsports Park
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08-05-2020, 07:27 PM | #8 |
Drives: 2018 hyper blue ZL1 1LE Join Date: Nov 2018
Location: Alabama
Posts: 165
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Thanks for the info. Going to have my fabricator cut off the outer tips and add a v band. I'll then be able to easily take off the tips and add the track pipes he's making.
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08-05-2020, 11:44 PM | #9 | |
Drives: Track prepped 2018 Camaro ZL1 (a10) Join Date: Aug 2013
Location: Victoria B.C. Canada
Posts: 1,376
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Quote:
I’d like to know since I’ll be doing this in the fall, except I have magna flow 50 series mufflers for the track only, which so far is keeping me at 87 dB even with secondary cats removed.
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2018 ZL1; Mag 2650, 2" LT Headers and intake, a bunch of SPL suspension upgrades, YYZ springs, sway bars, APEX wheel and SC3R's
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08-06-2020, 08:48 AM | #10 | |
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Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011
Location: St. Charles, IL
Posts: 18,663
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Quote:
I think he originally went with an off road system. With cats you're still going to be louder but not nearly as much. |
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08-06-2020, 10:31 AM | #11 |
Thank you Al Oppenheiser!
Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017
Location: Sarasota, FL
Posts: 4,966
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The stock ZLE will not pass sound at Laguna unless you lift or have pipes. So there's no way headers and green cats will pass without similar mitigation.
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08-06-2020, 11:09 AM | #12 |
Drives: 2018 hyper blue ZL1 1LE Join Date: Nov 2018
Location: Alabama
Posts: 165
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Yikes! I didn't know that. We'll I'm glad I suck with the stock muffler. I thought about getting a meisterschaft and adding track diverter pipes, rethinking that idea. Going to try and get a db reading this weekend. I'll do the same after adding the track pipes.
Last edited by 2out2sea; 08-06-2020 at 02:45 PM. |
08-06-2020, 05:45 PM | #13 |
Drives: 2020 Camaro ZL-1 1LE Join Date: Jul 2018
Location: Nashville
Posts: 211
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I kept the stock muffler. With long tube headers the car put out 104-105 DBs.
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Home Track: NCM Motorsports Park
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08-06-2020, 06:12 PM | #14 |
Drives: 2018 hyper blue ZL1 1LE Join Date: Nov 2018
Location: Alabama
Posts: 165
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Ugh, that's what I expected. I'll see this weekend if I can run a test. I'll keep y'all posted.
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