Kosmo
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| posted on 26/4/09 at 06:38 AM |
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Noise problem - 104db !
I have my SVA re-test on Friday and only job left is to reduce noise from 104db to 101db !!
I have foam filter so lots of induction noise and have no room for original airbox, I also think a lot of noise is comming from the engine because
without the bonnet on it's 108db.
I was looking at insulating the underside of bonnet and side panel etc... has anyone tried this with success and if so what did you use, need help as
running out of ideas ?
Cheers,
Kosmo
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nitram38
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| posted on 26/4/09 at 07:47 AM |
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Do you have any air-conditioning/ducting companies near you?
They should have insulation that they stick on the outside of the ducts. It is basically rockwool with a silver foil covering and is about 20mm-50mm
thick.
They also should have some 3m stickie pads with spikes and washers.
These stick to your underside of your bonnet and the rockwool is pushed onto the spike. The washers go on the spike to hold the rockwool on and all
you do is trim the spike down.
Alternatively you could evostick it on.
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westf27
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| posted on 26/4/09 at 07:51 AM |
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db killer up the pipe
555
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nitram38
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| posted on 26/4/09 at 07:53 AM |
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quote:
Originally posted by westf27
db killer up the pipe
Make sure you get one where you can still get the emmissions probe in though, otherwise it is a fail
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marmot0
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| posted on 26/4/09 at 08:50 AM |
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Yes I failed twice on noise with my striker and lagging pannels with accoustic foam cracked it (108 dB first time) make sure you use motorsport stuff
as the tester check that it was fire proof. Make sure you lagg the bonnet side pannels and inside the transmission tunnel.
Also if you have a digidash change the number of cylinders to 3 !!!! You atre more than welcome to borrow the foam as it s all cut to sixe if you can
pck it up (london)
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iiyama
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| posted on 26/4/09 at 10:10 AM |
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Ive got the same problem, at test the car was 103. used a baffle and a few pieces of dynamat and at re-test I had 109!!
Been looking at lagging engine bay. Cheapest stuff I could find is this:-
http://www.pipelagging.com/sound-proof-sheet-insulation-10mm-thick-plain-armasound-sheet-p-496.html
Sound insulation of any kind seems to be very expensive! 
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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ashg
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| posted on 26/4/09 at 10:16 AM |
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this stuff is the best on the market. i have used it in all my cars to date and it has provided significant db reductions
if you go on youtube and search for second shin there are demonstrations of i in action.
Second Skin
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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twybrow
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| posted on 26/4/09 at 12:08 PM |
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I lagged my bonnet with some left over solid wood underlay (looks like camping mattress). It seemed to help. My tester said nothing....
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phil m
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| posted on 26/4/09 at 02:47 PM |
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As with others - home made baffle (22mm copper pipe wrapped in steel wool)
Plus loads of carpet did it for me on re-test. Stuck carpet offcuts onto bonnet, sides of engine bay, underside of nose cone and lined scuttle/battery
tray . Also carpet on floor infront of seats- couldn't believe the difference- incredible 
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Kosmo
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| posted on 26/4/09 at 07:32 PM |
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OK, looks like I have a plan.... lots & lots of soundproofing.
Thanks
Kosmo
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