BNG 2006 - Track Day Mon 4th

[ntel]

Just booked my place with the club office. I'm a track day virgin, so please be gentle with me and break me in slowly!!!!!! I believe the noise limit is 105dba. At what engine speed is that measured and how far away from the zorst is the noise meter placed? I'll check the the noise level myself before I go just in case I have to put the standard cans back on the Tuscan.

[gemini]

Excellent news

Dont know the answer to DB level measurements
TVRBob and Guillotine (monster) may know?

[tvrbob]

gemini said:

Dont know the answer to DB level measurements
TVRBob and Guillotine (monster) may know?

Croft Circuit doesn't measure cars on entry. The pit wall marshal will black flag cars that he suspects to be too loud and then test them. I have yet to witness a TVR be pulled. To be honest Cerberas with straight through exhausts and some precat wedges may get close, S6's even with loud exhausts won't be an issue.

[ntel]

Thanks for the reply Bob. I would still be interested in how they do carry out the test though, for future reference.

[tvrbob]

ntel said:

Thanks for the reply Bob. I would still be interested in how they do carry out the test though, for future reference.

The meter is set at 45deg to the tailpipe at 1 metre. With engine hot the revs need to be held at a constant 1/3 of the rev range. The average value over a 'short' period is then given for your car. These values are always low because there's no popping and banging and the engine isn't under load. Your car will develop much greater values in use but the track uses this set test to give them comfort that the car won't exceed the council requirements for noise pollution. The test method can vary from track to track but the principle that a controlled trackside test be used to extrapolate a track use value is the same on all the tracks as far as I am aware.

[tvrbob]

Word of warning

Anyone with Spiders and four pot front callipers, take your front wheel centre caps out. If you track hard then you'll melt the plastic lugs off. I speak from bitter experience.

[Fly Boy]

Nice tip Bob,
I take it you melt yours then

[tvrbob]

Certainly did. They were still in when I got home but one fell out on my garage floor and so I investigated and found both were well knackered. Luckily I had a friend at TVR Engineering who slipped a couple of new ones my way.

Edited by tvrbob on Monday 21st August 19:26

[ntel]

Thanks for sharing your knowledge Bob. First time on the track for me so the only thing I'll be melting will be the maltesers in me underpants!

[yi8tvr]

tvrbob said:

Croft Circuit doesn't measure cars on entry. The pit wall marshal will black flag cars that he suspects to be too loud and then test them. I have yet to witness a TVR be pulled. To be honest Cerberas with straight through exhausts and some precat wedges may get close, S6's even with loud exhausts won't be an issue.

HAPPY DAYS

[tvrbob]

Gemini YHM

[gemini]

cannot read my mail til tomorrow

[Captain Beaky]

Just booked two places...

[gemini]

[gemini]

Why not ring up if theres a problem rather than write it here!

Lunch is inc

The forms are standard TVRCC
The day briefing will make all clear!

[Tuscnick]

Have you ordered good weather ?

[gemini]

yes for sun / mon

[MrsS]

For peeps not too sure of fuel facilities near Croft, V-Power available just South of Scotch Corner on the A1 at 98.9 p/litre (about 15mins from the circuit). Lunchtime 98 octane refuel is also available reaonably local.

[tvrbob]

MrsS said:

For peeps not too sure of fuel facilities near Croft...

Good point. My Chimaera uses more than a tank full on a full day sessioned event.

Local V Power stations here

[Fly Boy]

Thanks for that, was just googling for the nearest station.