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C11BRA
Hockenheim


Joined: 30 Mar 2015
Posts: 688
Location: North London. Herts.


PostPosted: Sat Jan 11, 2020 10:39 am    Post subject: Spa noise level testing procedure advice needed. Reply with quote

Help!!!!

My loving wife treated us to a Spa track day in March. Then she realised that there is a 103db noise limit. (We barely scraped under the 105db limit at Goodwood in the 996 and that car was silent compared to this bonkers 997!)

So. I was already planning to re-instate the cats with sports units. And I have already sourced a pair of stock silencers. I was thinking of fabricating a switchable Gundo hack? And keep the centre exit pipes.....of course.

I have 2 valves that I fitted to my Audi. Absolutely incredible. Totally stock in closed mode, then fun mode when open. (I need to grow up ...... she says) I actually call the closed position ‘wife mode’.

Anyway. Does anyone know the 103db testing procedure at Spa? What engine speed they ask you to hold etc?

At 3000rpm approx 1 metre away I could just about manage 100db on my cheapo guide meter I just bought. But this is not truly representative of the noise this car makes.

A quick blip on the pedal revealed the true extent of the problem.



I will have the new exhaust fitted before March, but any advice on the testing procedure would be appreciated.

Thanks.
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911UK
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Joined: 15 May 2002
Posts: 10324
Location: 911UK

1997 Porsche 993 Carrera 2

PostPosted: Sat Jan 11, 2020 11:18 am    Post subject: Reply with quote

a guide from CAT DT on noise testing

https://catdrivertraining.co.uk/track-day-noise-limit-guide/


Spa Noise limits

Every vehicle must be in a condition that complies with Belgian traffic regulations and must not exceed the maximum sound level of 105 dB.

Strict testing will be done at the exhaust, measured with a sound level meter at 1 meter from the exhaust, at 45 degrees, with the engine running at 75% of the maximum rpm.

But check with your organiser as some events can be at 103dB
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C11BRA
Hockenheim


Joined: 30 Mar 2015
Posts: 688
Location: North London. Herts.


PostPosted: Sat Jan 11, 2020 11:54 am    Post subject: Reply with quote

Brilliant. Thank you. About 6000 rpm then.
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2006 997.1. Project GT3C. C stands for ???
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996ttalot
Approved Trader


Joined: 21 Sep 2009
Posts: 1516
Location: Horley Gatwick


PostPosted: Sat Jan 11, 2020 1:06 pm    Post subject: Reply with quote

At Spa they don't do a specific test - they measure on the start finish straight just before La Source. So worse case, you can just lift a little half way down before the meter.
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easternjets
Watkins Glen


Joined: 29 Apr 2016
Posts: 2182
Location: Darlington


PostPosted: Sat Jan 11, 2020 1:50 pm    Post subject: Reply with quote

Yes they use a drive by noise test, only problem there is if you get a couple of cars together giving it the beans then it will trip the noise limit. This happened at Croft recently, we passed the static noise test but were Black flagged because we failed the drive by noise test, they were actually really good about it and as others have said just told us to back off when driving past the noise meter!
If you have a stock back box just fit it for the trip, you should be okay.
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Phil 997
Le Mans
Le Mans


Joined: 05 Dec 2015
Posts: 15679
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Sat Jan 11, 2020 2:51 pm    Post subject: Reply with quote

As others have said , Spa had a sound set up in the control room and they measure it down the straight through the stands so just back off a little through there , something I didnt do Surprised Dont know and got pulled for it . mine was running at 133db at the time Grin Thumb its a great circuit have fun and watch out for the opposite camber at the top of Eau rouge Grin Grin
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Teffers
Monza


Joined: 28 Dec 2009
Posts: 165
Location: West Mids


PostPosted: Sun Jan 12, 2020 10:15 am    Post subject: Reply with quote

As mentioned - regardless of what any TD organiser does with their own measurements, the one that counts is the circuit's own driveby on the start finish straight. I'm sure there's quite a few people out there with a nice photo to go with their infringement!

Normally the Spa limit is @110db drive by which is generous by normal UK standards but not quite as generous as the 132bd my 'Ring days Thumb

In my humble opinion, anyone failing noise limits on a track day is either Eddie Irvine qualifying in a 2001 Ferrari F310B - or an idiot.

There are very, very few EU manufacturers of cars that don't put out products capable of passing noise tests. Sport buttons don't need to be pressed! As with the aftermarket - more noise does not necessarily equal more speed.

Apologies in advance for the rant - the second most amount of my time on events is taken up trying to explain to Carlos Fandangos why noise limits apply to them.
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Teffers
Monza


Joined: 28 Dec 2009
Posts: 165
Location: West Mids


PostPosted: Sun Jan 12, 2020 10:17 am    Post subject: Reply with quote

132bd?

Embarassed

132 db Smile
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