Noise Limits on Track Days...
Discussion
Just don't try to go to Goodwood 
Mind you, on a Sunday you could have a quick blast down there and get it measured by the martials, old bean.
They're usually just stood around and will happily wave their pokey noisemeter at anything you drive up to them.
WHAT'S IT SAY? DUNNO, ITS MELTED....
Mind you, on a Sunday you could have a quick blast down there and get it measured by the martials, old bean.
They're usually just stood around and will happily wave their pokey noisemeter at anything you drive up to them.
WHAT'S IT SAY? DUNNO, ITS MELTED....
It all depends upon the track owners and the type of track day as to what the noise limit is. I have been to Snetterton when the limit is 115dB and have been to Castle Coombe where the limit is 98dB. Goodwood varies depending on whether they are running a 4 or 8 car day. If it is 4 cars, it is usually about 105dB, whereas if it is an 8 car day, it drops to 100dB. (4 or 8 car days refer to the number of cars on track at a time).
The best advice is to phone the organisers beforehand. Usually the noise limit is stated in the paperwork sent to your home.
My TVR S2 is usually 104dB's. If they check the noise on grass, it usually drops to 102-103dB.
Jas.
The best advice is to phone the organisers beforehand. Usually the noise limit is stated in the paperwork sent to your home.
My TVR S2 is usually 104dB's. If they check the noise on grass, it usually drops to 102-103dB.
Jas.
Rich...An S with a cat will be about 92-94db
Without cat standard exhaust in good condition around 100db
An old or sports exhaust could be as much as 106db or more
Mine is a standard s/s exhaust its getting a bit old and is about 105db.
There are various think you can do to get the noise down including inserts, supertraps etc. I can get mine down to 93db. Probably a bit lower if I tried hard.
Mark
Without cat standard exhaust in good condition around 100db
An old or sports exhaust could be as much as 106db or more
Mine is a standard s/s exhaust its getting a bit old and is about 105db.
There are various think you can do to get the noise down including inserts, supertraps etc. I can get mine down to 93db. Probably a bit lower if I tried hard.
Mark
quote:
quote:
inserts, supertraps etc.
What are these, and where do you get them ?
demon tweeks & similar companies sell them they are extra mufflers to stick on the end of ya exhaust pipe to make it past the noise regs, but usually they have them at goodwood ready to sell u. And I have found them to always over read down at goodwood ie measured a 911 at 100db @ castle coombe but 2 weeks later same car = 103db @ goodwood so then they sell you a supertrap type muffler.
Merlin Motor Sports at Castle Combe sells additional silencers that bolt on the tail pipe, as S exhaust are only 90mm apart these do not fit properly.
Tower View in Cricklewood will do inserts. Demon Tweeks do supertraps again be carefull only the 3" disc series will fit an S. There is a company can't think who they are, will make a bolt on silencer for an S, but its not cheap.
Mark
Tower View in Cricklewood will do inserts. Demon Tweeks do supertraps again be carefull only the 3" disc series will fit an S. There is a company can't think who they are, will make a bolt on silencer for an S, but its not cheap.
Mark
I have a pair of baffles which I purchased from Merlin Motorsport and they fit my S2 perfectly.
They are for sale if any of you lot want 'em. £50 the pair and only been used once.
Give my the dimensions of your exhaust pipes and the space between 'em and if they fit, they're yours!
Jas.
They are for sale if any of you lot want 'em. £50 the pair and only been used once.
Give my the dimensions of your exhaust pipes and the space between 'em and if they fit, they're yours!
Jas.
I believe the reason they're so stringent at Goodwood is because the local authority have noise monitoring stations dotted around the circuit. These are linked directly back to the councils offices. Any cars breaking the limit are excluded and the days organisers get their wrists slapped. Hence they take no chances.
Paul
>> Edited by ultimapaul on Wednesday 25th September 21:48
Paul
>> Edited by ultimapaul on Wednesday 25th September 21:48
Unfortunaqtely that's becoming more and more common. Combe is the same. People move to the village, which has had a motor racing circuit for 50 years, and then complain about the noise. The people who have lived there all their lives are generally pretty cool with the noise.
Apparently the Goodwood thing is al down to one old guy who lives about a mile from the circuit. The councils have got microphones rigged direclty to the council offices, and every single noise infringement is logged. Somebody should
the old git 
Apparently the Goodwood thing is al down to one old guy who lives about a mile from the circuit. The councils have got microphones rigged direclty to the council offices, and every single noise infringement is logged. Somebody should
the old git 
So the local authority have microphones to catch noisy cars at Goodwood ---- is this an urban myth? How can cars driving by a microphone be detected as noisy when more than one car may be contributing to the measured noise?
Also, depending on the proximity of other sound absorbing/deflecting/reflecting sound surfaces, the measurements would surely be very arbitary and bear no relation to those measured at scrutineering.
Urban myth or has anyone suffered by this monitoring? Come on own up...
Phil
Also, depending on the proximity of other sound absorbing/deflecting/reflecting sound surfaces, the measurements would surely be very arbitary and bear no relation to those measured at scrutineering.
Urban myth or has anyone suffered by this monitoring? Come on own up...
Phil
quote:
So the local authority have microphones to catch noisy cars at Goodwood ---- is this an urban myth? How can cars driving by a microphone be detected as noisy when more than one car may be contributing to the measured noise?
Also, depending on the proximity of other sound absorbing/deflecting/reflecting sound surfaces, the measurements would surely be very arbitary and bear no relation to those measured at scrutineering.
Urban myth or has anyone suffered by this monitoring? Come on own up...
Phil
I have been to six track days at Goodwood. There are what look like microphones dotted around parts of the circuit and I have seen cars pass the static noise test only to be pulled off later for drive by noise infringements.
Whether there is a direct link to the council or not I do not know. However it is the static test that should be regarded as the arbitrary guide. The important bit for the circuit is how likely you are to generate a complaint once you are pressing the loud pedal with all the tyre and induction noise too.
I think b19toy has hit the nail on the head. The noise microphones register readings that the council can relate to anticipated noise nuisance calls being made. They will not relate to the static tests. It still does not answer though the point regarding the level read by the microphones perhaps being the noise combination of two or more cars....
Or is all this a ploy to get the additional sales for their add-on silencers... Just joking.
Question: If my car has passed the static test and later on I am pulled off because of the microphone level reading, do I get your entry fee refunded? Seems unfair if I don't.
Phil
Or is all this a ploy to get the additional sales for their add-on silencers... Just joking.
Question: If my car has passed the static test and later on I am pulled off because of the microphone level reading, do I get your entry fee refunded? Seems unfair if I don't.
Phil
Re Goodwood:
Apparently they do have microphones at various places around the circuit, and the noise levels are supposedly monitored at Chichester council office, and at the marshalls office at the circuit. If a car breaks the noise limit on a 'drive-by', all track activity is stopped for half an hour. (I have personally been caught up in this when it has happened).
Bear in mind that exhaust noise output may be quieter than induction roar from an engine under load, (particularly on Westfields, Caterhams, etc.....) which is why a car may pass the noise test in the paddock, only to fail on the circuit.
Jas.
>> Edited by Paceracing on Saturday 28th September 19:07
Apparently they do have microphones at various places around the circuit, and the noise levels are supposedly monitored at Chichester council office, and at the marshalls office at the circuit. If a car breaks the noise limit on a 'drive-by', all track activity is stopped for half an hour. (I have personally been caught up in this when it has happened).
Bear in mind that exhaust noise output may be quieter than induction roar from an engine under load, (particularly on Westfields, Caterhams, etc.....) which is why a car may pass the noise test in the paddock, only to fail on the circuit.
Jas.
>> Edited by Paceracing on Saturday 28th September 19:07
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