IainL
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| posted on 27/5/13 at 11:46 AM |
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Fireblade Noise
Thought I would check how load the car is, as I was planning on doing a track day soon.
So borrowed a meter from work just reved the car up to 7500 rpm and the meter showed 115db 
How can I get the noise down as my local tracks all have a limit of 100db? 
The car is fitted with a 919 Fireblade engine, a standard Aires supplied exhaust and a AB airbox, I have already repacked the exhaust.
Do I need a new exhaust? If so could someone recommend me a supplier
Cheers,
Iain
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daniel mason
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| posted on 27/5/13 at 12:04 PM |
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how faer away from tailpipe were you with db meter?
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IainL
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| posted on 27/5/13 at 12:06 PM |
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quote:
Originally posted by daniel mason
how faer away from tailpipe were you with db meter?
about 1/2 meter
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zekill
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| posted on 27/5/13 at 12:13 PM |
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I don't undertand.
same engine with oem modded airbox and repackable silencer on my Fury.
Very low sound, largy under 100db.
What is your silencer size ?
Fisher Fury with Phoenix bodywork, Blade 919cc
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IainL
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| posted on 27/5/13 at 12:30 PM |
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quote:
Originally posted by zekill
I don't undertand.
same engine with oem modded airbox and repackable silencer on my Fury.
Very low sound, largy under 100db.
What is your silencer size ?
The silencer is 5 inch diameter and 570mm long
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mark chandler
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| posted on 27/5/13 at 02:46 PM |
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Each end of mine was quiet, the overall noise however was not as you have thin body panels and the exhaust and air filter are close together, even
standing between the exhaust outlet and engine knocked a few dB off.
I fixed mine by taking the exhaust out the back, separating the exhaust rumble from inlet and general engine noises, before being so drastic try
pointing the outlet under the car rather than out the side.
Regards Mark
[Edited on 27/5/13 by mark chandler]
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renetom
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| posted on 27/5/13 at 04:39 PM |
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Hi
Seems strange to me
We had an american cat, a standard seconhand bike can , put a db killer
in it before fitting the bend & trim.
At IVA this gave us 97Db , my meter had the same reading as IVA man's
After IVA took off the cat & Db killer, still gave us 98DB
Have now changed to an R1 silencer which still gives 98Db but a more acceptable noise.
 
IVA exhaust with cat
good luck
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zekill
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| posted on 27/5/13 at 04:41 PM |
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quote:
Originally posted by IainL
quote:
Originally posted by zekill
I don't undertand.
same engine with oem modded airbox and repackable silencer on my Fury.
Very low sound, largy under 100db.
What is your silencer size ?
The silencer is 5 inch diameter and 570mm long
mine is 570*6, no noise.
Fisher Fury with Phoenix bodywork, Blade 919cc
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Doctor Derek Doctors
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| posted on 27/5/13 at 08:57 PM |
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115 dB is ridiculous, that can't be right.
As probably you most relevant guide my car 919 with AB performance airbox and an Akropovic exhaust can on the end of an AB manifold was measured at
Mallory and was 103dB at 7-8000 rpm.
Designer and Supplier of the T89 Designs - Single Seater Locost. Build you own Single Seater Racecar for ~£5k.
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www.t89.co.uk
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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adithorp
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| posted on 27/5/13 at 09:44 PM |
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quote:
Originally posted by IainL
quote:
Originally posted by daniel mason
how faer away from tailpipe were you with db meter?
about 1/2 meter
You need to measure it at 1m and 45'angle from the tailpipe.
115db would make your ears bleed.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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