matt.c
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| posted on 25/6/09 at 10:27 PM |
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GUESS THE DECIBELS? EDIT: NOT GOOD!
Time for a little game as its nearing the end of the week. Im testing how loud my indy is at a static test.
Test will be taken @ 3/4 RPM which is 9k
My indy is powered by a ZX9R engine and has a standard R1 can and a pipercross sausage filter.
So then, how loud do you think it will be?
[Edited on 27/6/09 by matt.c]
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BenB
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| posted on 25/6/09 at 10:28 PM |
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101.1db? 
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twybrow
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| posted on 25/6/09 at 10:33 PM |
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103db
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Steve Hignett
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| posted on 25/6/09 at 10:39 PM |
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I think it will be quieter when wasting time doing a stupid static test at 3/4 revs than if it was doing Max Revs being ragged down the road
mate..............
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nitram38
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| posted on 25/6/09 at 10:43 PM |
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103.7db
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eccsmk
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| posted on 25/6/09 at 10:43 PM |
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100db
can you do one at full chat some where??
there must be a nice private road near you somewhere
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matt.c
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| posted on 25/6/09 at 10:57 PM |
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Marham airfield = 105Db
Snetterton race track = 102Db 
I think i might struggle with the snetterton Db's 
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eccsmk
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| posted on 25/6/09 at 10:59 PM |
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quote:
Originally posted by matt.c
Marham airfield = 105Db
Snetterton race track = 102Db
I think i might struggle with the snetterton Db's
b*gger i best get my exhaust changed then
or i wont be allowed at marham
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mark chandler
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| posted on 26/6/09 at 12:12 AM |
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I suspect your noise is induction, a standard R1 can is quiet relatively.
Better to box them filters in, at the same time duct the air to the front of the car pointing away from the exhaust.
Sticking a 90 degree bend on the exhaust exit will also kill a little noise, it does not travel around bends well.
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Steve G
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| posted on 26/6/09 at 12:19 AM |
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99.1dB
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flak monkey
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| posted on 26/6/09 at 06:58 AM |
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I reckon it will under 100dB.
How do they do the noise tests at tracks? Is it a driveby monitoring?
Sera
http://www.motosera.com
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Guinness
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| posted on 26/6/09 at 08:17 AM |
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I've just lent my dB meter (an un-calibrated Maplin's one) and some parts to SteveB for his SVA re-test.
His R1 powered car with sausage filter and an R1 can was 103dB.
With my Pipercross Airbox, and an exhaust baffle, he passed the noise test with flying colours at 95dB.
I'd guess you would be around the 104dB marker at 3/4 max revs.
Mike
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DM
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| posted on 26/6/09 at 10:10 AM |
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quote:
Originally posted by flak monkey
I reckon it will under 100dB.
How do they do the noise tests at tracks? Is it a driveby monitoring?
both -
stationary test is usually something like 0.5 metres 45 degrees away from the exhaust at 3/4 max revs, which will have a higher threshold than the
driveby test
eg, bedford autodrome
101 db static and 87db drive by
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mistergrumpy
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| posted on 26/6/09 at 02:01 PM |
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3/4 is 9000rpm? I think I only declared 9000rpm tops so only had to be tested at 7500rpm 
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eccsmk
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| posted on 26/6/09 at 02:10 PM |
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by the way matt whats the prize for the nearest answer
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matt.c
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| posted on 27/6/09 at 10:07 AM |
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What do i rev it too as it says on the clocks its a 12 red line?
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matt.c
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| posted on 27/6/09 at 10:08 AM |
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quote:
Originally posted by eccsmk
by the way matt whats the prize for the nearest answer
LOL a photo of my car on a trackday.
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eccsmk
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| posted on 27/6/09 at 06:50 PM |
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quote:
Originally posted by matt.c
quote:
Originally posted by eccsmk
by the way matt whats the prize for the nearest answer
LOL a drive of my car on a trackday.
sounds good to me
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flak monkey
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| posted on 27/6/09 at 07:19 PM |
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And the results are in....
80dB ticking over
106dB at 9k rpm (3/4 max)
95dB at 6k rpm
Induction noise was negligable.
Results are with a std R1 can
David
Sera
http://www.motosera.com
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matt.c
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| posted on 27/6/09 at 07:31 PM |
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ARGH!!!!  WTF do i do now!
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eccsmk
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| posted on 27/6/09 at 10:22 PM |
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more importantly when does Guinness get his piccy
u2u on its way matt.
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RickRick
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| posted on 29/6/09 at 12:02 PM |
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frig your rev counter!
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