Sboxin wrote:
Just for clarification - -
Where is the Noise limit posted/written for Thunderhill for NASA Nationals West ?
I am having difficulty finding this information.
And, could someone tell me exactly how they measure the car sound level - distance, location, equipment ?
We will be able to comply with the sound level requirements - but it helps to have all the information ahead of time.
Thank you,
Regards,
Thanks Jim,
I talked with the T-Hill GM and he provided excellent information about their 103 dbA sound level compliance checking -
Yes, the testing equipment is 50' on the outside (paddock side) of the turn 15 coming onto the Start/Finish straight -
there is a microphone outside and a person inside the booth/shack checking cars for compliance. It is OK to use directional exhaust
pipes - HOWEVER, the course flag station workers will also be listening for loud exhaust on the inside of the track and may
Black flag a car if they think it does not comply with the 103 dbA level . . . (???) . . . it sounds like T-Hill is serious about
the 103 dbA compliance . . . which really isn't too restrictive except for some of us 108 dbA cars - and 5 dbA is a lot of
energy reduction . . .
We have a muffler to meet a 96 dbA level and will be using that for the NASA Nationals . . .
Regards,