Ferrino
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posted on 24/7/06 at 01:27 PM |
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Trackday Noise Limits
Was wondering what the protocol is for measuring static BEC noise limits on trackdays? Do they measure at 3/4 of rev limit or something? And are they
savvy as to the rev limit of the various engines yet?
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shortie
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posted on 24/7/06 at 01:43 PM |
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Unfortunately they do measure at 3/4 revs (usually) and they have enough savvy to know what the revs should be usually.
Problem is it's all very well passing a static test by lowering the revs but you will still often get done on a drive-by meter.
Rich.
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cadebytiger
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posted on 24/7/06 at 01:44 PM |
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What is the standar noise limit for a track day?
abouy 95db??
Thats about the same as a power drill i think?
Mine is louder than that i am sure!!
Rupert
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zxrlocost
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posted on 24/7/06 at 01:50 PM |
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not as low as 95 mate unless you go to a 'Posher' track like donnington
I only got 97 with a standard r1 Can
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Ferrino
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posted on 24/7/06 at 01:55 PM |
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I was looking at doing a 100dB airfield day - feck, at 9000 RPM mine has gotta be pretty close to that! Will get it tested methinks.
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R1minimagic
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posted on 24/7/06 at 03:56 PM |
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Mine was tested a CC at 102dB with the standard R1 airbox and can at 7500rpm. However, i was told that when going round the track it was one of the
quietest cars there!!
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ChrisGamlin
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posted on 24/7/06 at 04:47 PM |
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Ive found there is usually a bit of "artistic license" you can use on the peak revs, especially if you aren't using the bike clocks
so its not immediately obvious where the red line is.
I was tested the other day at Oulton Park, and I measured 97dBa @7500rpm (I said it revved to 10k ). That was with a carbon R1 can and sausage
filter.
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Ferrino
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posted on 24/7/06 at 04:51 PM |
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Hmmm, looks do-able then with a '10K limit', as I also have carbon R1 can and sausage filter. I think it's easy to tweak to max
displayed revs on my digital dash
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skydivepaul
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posted on 24/7/06 at 08:31 PM |
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it all depends on which track day you are doing. most will go on the 2/3rds max revs which also gives you a bit more leeway as opposed to the 3/4
max
mine reads 99db to 104db depending on who is using the sound meter!!!!!
R1 engine with pipercross filter and mk exhaust.
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smart51
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posted on 25/7/06 at 07:03 AM |
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My R1 engined car reads 101dB(a) at 8800 RPM on an uncalibrated meter. I have a 6" x 26" repackable stainless silencer on a 4 into 1
headder. Should be fine for the 105dB circuits.
[Edited on 25-7-2006 by smart51]
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cadebytiger
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posted on 25/7/06 at 08:15 AM |
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where do they take the reading cos mine is alot louder on the exhaust side!
Rupert
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skydivepaul
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posted on 25/7/06 at 09:07 AM |
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unfortunatley they take the reading at the exhaust side.
it should be 0.5 metre from the exhaust exit @ 45 degrees
reading at 2/3 max rpm
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smart51
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posted on 25/7/06 at 11:07 AM |
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Readings are usually taken at 3/4 max revs. My car is louder 0.5m from the bonnet on the exhaust side than it is 0.5m from the tailpipe.
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R1minimagic
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posted on 26/7/06 at 05:18 PM |
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Which circuits are 105db??
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richard thomas
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posted on 26/7/06 at 09:56 PM |
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What's the limit during SVA? is it more or less that the average trackday limit?
Rich.
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Ferrino
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posted on 9/8/06 at 04:36 PM |
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In the end I was tested at 7,000 RPM and made 99 dB (limit 100!) so just scraped through! This is with standard R1 can.
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