need to loose some DB's... help

[davidimurray]

You often get quite a lot of inudction noise. How is your air intake arranged? Generally, sound will eminate from openings like a big spherical ball - is there a direct line of site between the intake/sound meter? If so can you shroud the air intake on the one side to prevent the sound travelling in that direction. You should bear in mind that at the edges of the shroud, the sound will 'wrap around' the sharp corners but at a much reduce amplitude. Another little thing is that sound levels are not straight additions - best to look here http://www.engineeringtoolbox.com/ad...ibel-d_63.html
but basically if you have two noise sources, that are the same sound pressure level in dB, you will get a 6dB increase in the measured level.

Hope that makes some sense

[georgenewman1]

on previous cars ive owned i always found wraping the manifold in heat proof tape also helps reduce the engine noise quite a bit, wont do much at the can tho, hope it helps

[flyerncle]

It would not be the first ime I have used fiberglass insulation to stuff an exhaust can to quieten it down,another little trick we use to use on racing single seaters was a coke can over the outlet pipe just before the end and painted black. Worked a treat.

[baz-r]

retard the ign timing if you can that can help if it doesn't mess up your emissions

[snapper]

I used/inserted a Demon Tweeks decibel insert, worked like a dream and is easily removed afterwards, watch your emmisions though as the back presure goes through the roof.