Barksavon
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| posted on 21/3/15 at 08:43 AM |
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Exhaust silencing
I've got a track day at Blyton next weekend and am a bit concerned that my exhaust may be a bit too loud. I've got a Tiger Avon with
2litre pinto and the standard exhaust that came with the kit, has anyone any experience of noise level testing from similar cars (I appreciate all
cars are different)
Also any advice on what I could do to quiten it down, I've seen the repackable silencers and the gadgets that fit into the pipe etc also read
that some steel wool in the pipe could work....any views please?
One more question, on the website it states the test is conducted at 3/4 maximum engine revs, who decides what 3/4 max engine revs is?
The limit at Bottom is 105Db according to website
Ta
Ian
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matt5964
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| posted on 21/3/15 at 08:58 AM |
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You tell them what you Rev limit is and they ask for 3/4 of that. , shocked me first time as they were so trusting
105db is quite loud, on our old system we had a basic exhaust like the ones from kit spares on a 2ltr zetec at Cadwell and scored 102 at the first
track day and 99 on the second visit..
Be gentle on the throttle as to not over Rev it as they will just take the reading as its down to you to provide the correct rev's
Good organisers will allow you to go away have a 'fiddle' and re test.
Science having the simpson on we have been measured at 92 at Cadwell 94 at rockingham and 92 at Bedford , and that's with a higher Rev limit now
and the car is tuned to 221bhp (was170 inshallah before)
Luego velocity XT 2.0ltr 221.3bhp 178.9lbft
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Doctor Derek Doctors
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| posted on 21/3/15 at 09:07 AM |
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105dB In reality generally means 'no noise limit' as you would have to have something insane to beat that.
I have been to Blyton loads of times and have never been tested or seen anyone being tested there, I wouldn't worry.
Designer and Supplier of the T89 Designs - Single Seater Locost. Build you own Single Seater Racecar for ~£5k.
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Jon Ison
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| posted on 21/3/15 at 09:15 AM |
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You won't be tested at Blyton, they do have a drive by meter it's to the right of the track imidiatly after last corner/track entry, I
have only ever seen one car flagged off for noise, it sounded like a V16 at 12000rpm with open exhausts. Provided your not stupid loud you will be
fine.
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Barksavon
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| posted on 21/3/15 at 10:39 AM |
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Thanks for the replies guys, not so worried now
By the way Matt what's a "Simpson"
Ta
Ian
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motorcycle_mayhem
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| posted on 21/3/15 at 10:54 AM |
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As far as I know, the NIMBY's have yet to impact Blyton to it's detriment.
105, static, as has been said is quite loud. If there's no mention of a drive-by limit, then you should be OK.
If you were heading to Combe, Don., Brands, Croft or Goodwood, I'd have a different answer for you. The folks that have bought houses around
these circuits really don't like the fact that there's a race circuit there. It's not the fault of the circuit, the complainants
have the Councils on their side, with their ears on the meters. On these circuits, limits *are* enforced, ruthlessly.
Merlin Motorsport does an add-on that's very, very popular at the Combe meetings.
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adithorp
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| posted on 21/3/15 at 11:42 AM |
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You won't have an issue at Blyton unless it makes your ears bleed. Like Jon says I've only seen one car thrown off and it was the dump
valve on the turbo that was the issue.
The drive by is on the slowest corner, on the right so tends not to be full chat. One day there last year I was worried about the notoriously tight
105 drive-by at Zolder (where I was going a days later) so asked them to take note of what I was registering. Highest I recorded was 87db. When I got
to Zolder I was black flagged for 108db on the straight!
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Davey D
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| posted on 21/3/15 at 02:29 PM |
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Every time I've been to Blyton there has never been a noise test before going out. I've only ever seen one car be pulled in, which was a
TVR. I watched him launch from the lights at the start, and holy carp was it loud!!. I said he's deffo going to get pulled. .. Then lo and
behold at the last section where the black flags are kept he was waved in 
The best way to keep power up and noise down is with a big silencer. I run a RaceCo titanium 7.25" diameter silencer on my R1 engine. When I
did a noise test at Cadwell I was hitting the 98/99bB mark at 9.5k rpm
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matt5964
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| posted on 21/3/15 at 03:06 PM |
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quote:
Originally posted by Barksavon
Thanks for the replies guys, not so worried now
By the way Matt what's a "Simpson"
Ta
Ian
My exhaust system was custom made by simpson race exhausts, beautiful pice of work and really released the full potential of the engin work done.
Opted for a large silencer so no issues on track, but no compromise to performance.
Luego velocity XT 2.0ltr 221.3bhp 178.9lbft
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Barksavon
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| posted on 21/3/15 at 09:10 PM |
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Bit out of my reach I think. And my engine wouldn't justify a custom made exhaust ..... Hopefully one day.....!!!'
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