Phil

Where have you all gone !!

orbix

Will there be any training available for people that have never done a track day before?

Phil

As a Novice we will give you an extended driver briefing

We have free instructors available all day which will ensure your enjoyment

trevsjwood

iTrader: (2)

count me in Phil, sounds like a good day
Trevor

Phil

Available to book in the SIDC Store

orbix

I don't believe it the only date on my calender is the 11th April!!

I can't make it as im off to see The Prodigy

+Doc+

I need a new exhaust

Phil

I bet they exceed 105db

Phil

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Are you all not interested now ?

I will start promoting this elsewhere if your not

scoobynewbie72

iTrader: (1)

I need a car first

Phil

That might help

minty

iTrader: (1)

i'm trying to find out how LOUD my firestorm cat'less system is as i think it will be far too loud

Phil

105db is pretty high !!

I am sure Donnington will do you a noise test if you ring them and ask

Phil

T5NYW

iTrader: (4)

Phil,

Yes on both accounts or go to brands or bedford if closer

Tony

T5NYW

iTrader: (4)

some cars pass static but can fail on driveby's (on track meters) and also vice versa. if you ask for a test before the trackday they normally do a driveby, if they possibly can

Passing a static on the day is a starting guide, fail the driveby and your off

IIRC they have two on track noise meters, one on dunlop bridge and other on pit gantry. My Miltek is quite loud on the button it passed 98db short shifting but got bored registered 102db @ dunlop and black flagged.

BTW IIRC every 3 db, the noise is twice as loud, so 98bd-105db is quite a jump

IMHO IIRC

Tony

GC8

For every 3dB sound pressure doubles, but the increase in noise heard doesnt double.

RobinSherwood

The Dunlop Bridge has now been dismantled, though I am sure the noise meter will have been relocated somewhere nearby.

As far as I am aware the other one is on the gantry with the clock on it.

We have found that a flap of metal above the exhausts that in effect direct the noise downwards helps prevent our race car tripping the meter on the drive by. Might not be so practical to fit on a road car but might be useful for some who don't want the expense of a bung.

minty

iTrader: (1)

i have a noise meter on my iphone, i know it's not precise equipment but it may give me an idea. How far away from the tailpipe should it be held to get a reading ??? is there a standard eg. 1meter ??

Phil

1m at 45 degrees is usual

minty

iTrader: (1)

i'll give it a go. Cheers Phil.

trevsjwood

iTrader: (2)

still in

stevebt

iTrader: (8)

I would be up for this depending on dates, won't you need at least 60 runners to make it affordable ???

T5NYW

iTrader: (4)

Ok my statement was not 100% technically correct

db is normally considered SPL un-weighted pressure. unless stated db SIL. "p"= sound pressure = sound field quantity and "I"= sound intensity = sound energy quantity

98db (SPL) = 1.588656469 Pa
101db (SPL) = 2.244036909 Pa

1 Pa = 1 Pascal = 1 N/m2. and The reference sound pressure is p0 = 20 µPa = 2 × 10−5 Pa. Then If sound pressure 1Pa = 93.9794db SPL is doubled to 2Pa = 100db SPL. Which is directly Proportional and Pressure doubles at 6.0206 db SPL

I asume your refeing to is db A (weighted pressure)

The weighted system (Frigged) db A, The reason for measuring sound this way is that our ears and minds, perceive sound in terms of the logarithm of the sound pressure, rather than than "actual" sound pressure.
Which very much like you said Meaning if you double the sound pressure the index increases by approximately 3. A sound level of 100 dB(A) thus contains twice the energy of a sound level of 97 dB(A). Genrally reckoned that if you increase the dB(A) by 9-10, you double the "subjective" loudness.

As Phil said 105db A is a lot louder than 98db A

Tony

Someone pass me my anorak

BigBez

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Phil

11th April

Book in the SIDC Store now

Phil

11th April its in the SIDC Store now ..................is there an echo in here

GC8

If Id had a little more time Id have said that an increase of 6dB doubles the 'heard' sound: perhps it is 9dB though. Correctly tested at 105dB is a damned loud exhaust!

Simon

Phil

Yes it's true - we have a trackday at Donington on Saturday 11th April!

The details are exactly what you'd expect;

• National circuit
• 105dba noise limit
• open pit lane
• free instruction
• Protyre tyre support,etc

The only difference is the price and time it runs; 2pm to 7pm, which means you don't have to get up at the crack of dawn ... Signing on is from 12pm so you get a full 5 hours driving.
The price is only £119

The trackday runs alongside the ISTS Show and all bookings will also recieve one free entry into the Show for the Driver, so if you want to arrive early (and nab one of the 10 garages we've been allocated) you can look round the Show too. Passengers will have to pay to enter the Show.

Trackday timetable:

• 12:30 - Driver & passenger sign on
• 13:30 - Briefing
• 14:00 - Sighting laps and tracktime
• 19:00 - Close

Places are limited and available to members of the SIDC, MLR and GTROC

Donnington Park Website


SIDC ONLINE STORE

Cancellation Policy

Phil

Spaces are still available for those interested

Phil

Little Bump as this is only a couple of weeks away now