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Aug 24th, 2023
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Joined: Sep 2007
Posts: 1,646 Likes: 1
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Sep 2007
Posts: 1,646 Likes: 1 |
I always thought that the paperwork when ordering an Aero stated that side pipes were not holomogated and were an after-fit but you paid for 'side-exit preparation'.
Maybe that is just in the UK.
Aero 8 GTN. #10
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Joined: Aug 2013
Posts: 15,794 Likes: 14
Formerly known as Aldermog Member of the Inner Circle
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Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 14 |
I always thought that the paperwork when ordering an Aero stated that side pipes were not holomogated and were an after-fit but you paid for 'side-exit preparation'.
Maybe that is just in the UK. I understand you are correct. Of course, in the UK there is no measured noise check in the MOT, and largely little real control of after market modifications. Tarka is rated at 87db at 4725 rpm. At Castle Combe circuit they measured 86db at about 4500 rpm. I believe the car has an absolutely standard exhaust. As there are no silencers after the ones under the running boards below the doors I cannot see that side pipes would make much, if any, more noise.
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Sep 2011
Posts: 14,723 Likes: 149
Member of the Inner Circle
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Member of the Inner Circle
Joined: Sep 2011
Posts: 14,723 Likes: 149 |
It may have to do with the regulations as to where the sound is measured.
Peter ![[Linked Image]](http://bradley.it/public_images/drive.jpg)
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Joined: Aug 2013
Posts: 15,794 Likes: 14
Formerly known as Aldermog Member of the Inner Circle
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Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 14 |
It may have to do with the regulations as to where the sound is measured. True, the UK Homologation test is "drive by", so side pipes might be louder.
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Nov 2015
Posts: 7,910 Likes: 242
Just barreling along Talk Morgan Guru
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Just barreling along Talk Morgan Guru
Joined: Nov 2015
Posts: 7,910 Likes: 242 |
It may have to do with the regulations as to where the sound is measured. True, the UK Homologation test is "drive by", so side pipes might be louder. Highly likely as the sound pressure wave is travelling directly towards the microphone
Jon M
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Joined: Aug 2013
Posts: 15,794 Likes: 14
Formerly known as Aldermog Member of the Inner Circle
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Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 14 |
It may have to do with the regulations as to where the sound is measured. True, the UK Homologation test is "drive by", so side pipes might be louder. Highly likely as the sound pressure wave is travelling directly towards the microphone Perhaps the solution for the test is to simply turn the outlets so they point under the car.... then turn them back.... 
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Aug 2013
Posts: 15,794 Likes: 14
Formerly known as Aldermog Member of the Inner Circle
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Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 14 |
Tarka has a single, quite small, polished stainless covered silencer under each running board, with the outlet running to the back, ending in a double outlet. So different again from both the examples in your photos.
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Nov 2015
Posts: 7,910 Likes: 242
Just barreling along Talk Morgan Guru
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Just barreling along Talk Morgan Guru
Joined: Nov 2015
Posts: 7,910 Likes: 242 |
Part of the problem may be that what we see externally as a 'silencer' my have a very different construction & baffles/restrictions internally
Some are constructed to be a Silencer, and some are just a Resonator & you can't tell from the nice shiny outer casing
Jon M
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