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Joined: Jun 2019
Posts: 30
Just Getting Started
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OP
Just Getting Started
Joined: Jun 2019
Posts: 30 |
I have carried out the standard mod on the OEM stock exhaust by removing the front and rear baffles, kept the middle as original.
Pre mod had a couple of track days where the max DB level was less than 100db and passed OK
With the mod the exhaust noise has substantially increased. I don’t have a DB level meter to measure so how have you track day chaps got on when you have carried out the same mod?
Have you passed the DB test?
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Joined: Jun 2012
Posts: 2,141 Likes: 43
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2012
Posts: 2,141 Likes: 43 |
I very much doubt that your "Bafflectomy" exhaust will pass a track dB test, it is pretty close in standard trim for MMC Stage 1 and modified standard exhaust systems are usually louder. You may have to fit some dB killers to the ends for the day. I am sure Austin or Rob will have more details about track mods for you.
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Joined: Jun 2019
Posts: 30
Just Getting Started
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OP
Just Getting Started
Joined: Jun 2019
Posts: 30 |
I guessed as much.
Was thinking of having something I can just slip on the ends, dosen't have to look pretty
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Joined: Feb 2016
Posts: 7,925 Likes: 217
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,925 Likes: 217 |
Stand to be corrected but 95dBm springs to mind as the track limit at our local Snetterton circuit. My M3W with MMC stage 1 pipes did pass test on a residents track session but I was ultra gentle on the throttle  BTW I have a free app, Sound Meter, on my Android phone that records and displays dynamic sound levels in dBm. Not sure how accurate mind.
Last edited by RichardV6; 09/04/21 11:02 AM.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone
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Joined: Jul 2007
Posts: 28,417 Likes: 178
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,417 Likes: 178 |
Wonder where you are Barry? I do have a sound meter.
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly '09 Gen2 MINI Cooper ragtop '90 LR 90 SW
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Joined: Jul 2018
Posts: 1,031 Likes: 2
Has a lot to Say!
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Has a lot to Say!
Joined: Jul 2018
Posts: 1,031 Likes: 2 |
At my last track day (Lydden Hill) the limit was 103 db and my AR Stage 1 pipes failed by 2db at 5000 RPM. I am sure the G56 exhausts would have passed.
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Joined: Jun 2019
Posts: 30
Just Getting Started
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OP
Just Getting Started
Joined: Jun 2019
Posts: 30 |
Stand to be corrected but 95dBm springs to mind as the track limit at our local Snetterton circuit. My M3W with MMC stage 1 pipes did pass test on a residents track session but I was ultra gentle on the throttle  BTW I have a free app, Sound Meter, on my Android phone that records and displays dynamic sound levels in dBm. Not sure how accurate mind. I have a App on my phone but not to accurate when you get to the upper range. I think the DB is over track limits so I'll need to look at a slip on slip off something I can use
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Joined: Jun 2019
Posts: 30
Just Getting Started
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OP
Just Getting Started
Joined: Jun 2019
Posts: 30 |
Wonder where you are Barry? I do have a sound meter. Thks for the offer Graham but I'm down south from you nr Camberley. I'll look at finding a 'strap on'
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Joined: May 2010
Posts: 9,285 Likes: 69
Needs to Get Out More!
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Needs to Get Out More!
Joined: May 2010
Posts: 9,285 Likes: 69 |
Some tracks have tight-ish limits. It was either Donnington or Mallory, I think but maybe wrong, that had noise complaints from neighbouring houses after new occupants moved in! It put a question as to whether they could actually stay open. Near here Pembrey circuit is next to an RAF bombing range so take your pick! I have yet to see jets with extra baffles and the US ones are easily the loudest. When walking the dog in the adjacent forest I sometimes go to the track fence to view course activity if it sounds interesting. Pembrey airfield is also there. Over the last couple of years RAF have been landing transports on the beach too. As for track days there are noise reducers you can fit to the exhaust ends that might help. If your system checks too loud then perhaps contacting tracks you might use to see what they can do to help.
Last edited by sospan; 09/04/21 01:46 PM.
Plus Four MY23 Furka Rouge
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Joined: Feb 2019
Posts: 3,854 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,854 Likes: 2 |
At my last track day (Lydden Hill) the limit was 103 db and my AR Stage 1 pipes failed by 2db at 5000 RPM. I am sure the G56 exhausts would have passed. From what position is the DB measured? And how far from the end of the pipes?
The light at the end of the tunnel is actually a train. 2019 M3W
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