TimC
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| posted on 12/5/08 at 06:45 AM |
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Tailpipe Angle for lowest noise readings
Morning All
One job left to do on my car is to have the tailpipe welded to the silencer. I vaguely remember something about there being an optimal angle in
relation to the road for minimal noise. Can anyone clarify?
Thanks
TC
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Mr Whippy
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| posted on 12/5/08 at 07:35 AM |
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Straight up into the sky is the quietest, pointing at the ground beginning the loudest  so I guess its halfway.
you could always point it at a cunningly placed fireblanket, that would take some of the energy out of it or for the test just add another can or a
huge production car one, he won't fail you for the exhaust looking ugly.
[Edited on 12/5/08 by Mr Whippy]
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Howlor
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| posted on 12/5/08 at 08:22 AM |
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Agree with above. I tested 90 degrees, 45 degrees and pointing down to the road at the SVA and 90 was about the best, definately went up a lot when
pointed straight down.
Steve
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DaveFJ
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| posted on 12/5/08 at 09:09 AM |
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I thought mine was very loud - pointed out at about 80 degrees on the horizontal planr and down by about 30 degrees vertical plane....
But it passed the SVA sound test easily - admittedly it's a cra engine but it sounded DAMN loud to me - certainly louder than most other
CEC's I have seen!
Dave
"In Support of Help the Heroes" - Always
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Guinness
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| posted on 12/5/08 at 09:25 AM |
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Can anyone remind me of the test procedure?
If I remember correctly, the guy had a tripod, to which he fixed the sound meter sitting horizontally, this was then located from the tailpipe of the
car using an MDF template, which looked about 1m long and about 30 degrees from the back of the car?
I guess it's detailed in the manual, but I can't access my copy at the minute.
Mike
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DaveFJ
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| posted on 12/5/08 at 11:52 AM |
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quote:
Originally posted by Guinness
Can anyone remind me of the test procedure?
If I remember correctly, the guy had a tripod, to which he fixed the sound meter sitting horizontally, this was then located from the tailpipe of the
car using an MDF template, which looked about 1m long and about 30 degrees from the back of the car?
sounds about right... asked me to rev to 4000....
I guess it's detailed in the manual, but I can't access my copy at the minute.
Mike
Dave
"In Support of Help the Heroes" - Always
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