GaryM
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| posted on 19/7/07 at 07:03 AM |
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Noise emissions
Hi
Any idea how I can quieten an exhaust system like this
 
Description
It recorded a noise level of 99dB (at the SVA test yesterday) at 4100 rpm but I would like to do a track day where the limit is 100dB at 4500 rpm.
Obviously, I'm worried the extra rpms will increase the noise level over the limit.
Cheers
Gary
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smart51
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| posted on 19/7/07 at 07:45 AM |
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1) replace your silencer with a bigger one.
2) replace the long section of pipe in front of your silencer with another silencer
I did this. A 130mm long 6" diameter repackable silencer reduced my nose level from 105 dB(A) to 100 at 8800 RPM
3) Fit a dB killer into your tailpipe, then rejet your carbs to reflect the reduction in airflow at high engine speed. Accept the loss in power in
your engine.
4) go to a "noisier" track
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smart51
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| posted on 19/7/07 at 07:47 AM |
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Here is a pic of my extra silencerImage deleted by owner
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