Track day noise level

KennyT · Post by **KennyT** » Tue Aug 27, 2013 9:37 pm

I've just booked Spa for Saturday 13th October through their website, but not sure about the 105db noise limit.
I have never had my noise level taken, it's a 220 Exige S with Lotus stage 3 exhaust and TRD box, does anyone know roughly if I will be safe, over or borderline?

Cheers

Kenny

tut · Post by **tut** » Tue Aug 27, 2013 9:52 pm

You will be fine.

tut

neil · Post by **neil** » Wed Aug 28, 2013 7:06 am

I've never seen a Lotus fail a noise check at Spa. If you're concerned, just remember 2/3 of max revs is 4,000

Scottish Scrutineer · Post by **Scottish Scrutineer** » Wed Aug 28, 2013 8:07 am

What distance is that level measured at Kenny? If at the standard 0.5m, that is the normal level for race saloons in UK, so should be achievable.
Where about are you based? I'm in Fife and will be up at Knockhill this Sunday with my noise meter if you want to get it checked.
Failing that, there's a iPhone sound meter App that gives a reasonably close reading. Just make sure you're on A-Weighting and hold the microphone 0.5m away from the exhaust outlet at 45 degrees to the car. Also make sure the car is fully up to temperature and keep the clutch pressed to reduce the gearbox noise.
As a last resort, follow Tut's lead and lie about the rev limit

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Renny

KennyT · Post by **KennyT** » Wed Aug 28, 2013 8:50 am

Sounds reassuring then, thanks for that.
Renny- I have the car in Paris with me just now or could have had it checked.

The website says:
"maximum sound level of 105 dB at 1 metre from the exhaust, at 45 degrees, with the engine running at 75% of the maximum rpm"

But of course 75% of max RPM is ~4000, that will be my approach

When I have taken Porsche Carrera Cup cars through scrutineering before there is a dummy map on the stack dash showing RPM, everyone is up to it

tut · Post by **tut** » Wed Aug 28, 2013 8:56 am

Renny you urchin, how the devil did you know that?

tut

Andy G · Post by **Andy G** » Wed Aug 28, 2013 10:10 am

I'd be amazed if you were over 98db with that set up.

105db is stupidly loud - you'd need a broken exhaust to fail that

Scottish Scrutineer · Post by **Scottish Scrutineer** » Thu Aug 29, 2013 10:51 pm

Also 1m distance will knock about 3dB off, so equiv to 107-8 at 0.5m. Definitely loud at that

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Renny

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