LCMT Event
06-12-2023, 05:25 PM
#31
Drifting
This ...
NOISE RESTRICTIONS:
All race cars are required to be fitted with a muffler and pass a compulsory static test at the circuit prior to going on track.
Static testing will be conducted in the paddock (false grid) on Wednesday-Thursday and Friday (see the static testing time).
Static tests and dynamic noise levels will be measured up to a maximum of 92 dBA using a Larson-Davis 851C Sound Meter. This is the officially recognized device and its results will be final.
Be sure to read the attached rules and procedures on all NOISE RESTRICTIONS. Failure not to have read these is no excuse.
To set up your own test in advance:
a) use a quality sound meter
b) set up 15m away from the car and measure perpendicular to the race car
c) be sure you take you readings at full revs
PLEASE NOTE: It is no guarantee that your personal test passes the track static test.
These are the official guidelines for the 2023 Summer Classic, the sound rules also apply for any on track activities !
Cheers
Phil
NOISE RESTRICTIONS:
All race cars are required to be fitted with a muffler and pass a compulsory static test at the circuit prior to going on track.
Static testing will be conducted in the paddock (false grid) on Wednesday-Thursday and Friday (see the static testing time).
Static tests and dynamic noise levels will be measured up to a maximum of 92 dBA using a Larson-Davis 851C Sound Meter. This is the officially recognized device and its results will be final.
Be sure to read the attached rules and procedures on all NOISE RESTRICTIONS. Failure not to have read these is no excuse.
To set up your own test in advance:
a) use a quality sound meter
b) set up 15m away from the car and measure perpendicular to the race car
c) be sure you take you readings at full revs
PLEASE NOTE: It is no guarantee that your personal test passes the track static test.
These are the official guidelines for the 2023 Summer Classic, the sound rules also apply for any on track activities !
Cheers
Phil
Last edited by wildcat077; 06-12-2023 at 05:30 PM.
06-13-2023, 12:19 PM
#32
Three Wheelin'
As someone who has driven racecars for years that are challenged to make stringent sound limits at tracks like Lime Rock (88 db), I'll share a few observations/considerations ...
Trying to model the on track 50 foot trackside moving db test at home is a fool's errand. Too many variables, notably the track's terrain (which heavily influences sound levels).
If you actually have a place to properly test full throttle and at speed, you can get an idea where you stand, but the closest you'll likely get in within several db (which is a lot).
Sounds like you can at least replicate the LCMT stationary test, that's a good start. No experience with those.
Db levels are affected by many things including cloud cover, humidity, and leaves on the trees vs. not (Fall track events). These things can cause swings of several db from my experience. I think the tester's mood may be on this list too lol.
Your best bet is to check with others who have similar cars and exhaust setups to see if they pass sound at LCMT or whatever track you're going to. And if you'll be close to the limit, have some turndowns, baffles, or even alternate muffler setups on hand in case you fail sound.
Trying to model the on track 50 foot trackside moving db test at home is a fool's errand. Too many variables, notably the track's terrain (which heavily influences sound levels).
If you actually have a place to properly test full throttle and at speed, you can get an idea where you stand, but the closest you'll likely get in within several db (which is a lot).
Sounds like you can at least replicate the LCMT stationary test, that's a good start. No experience with those.
Db levels are affected by many things including cloud cover, humidity, and leaves on the trees vs. not (Fall track events). These things can cause swings of several db from my experience. I think the tester's mood may be on this list too lol.
Your best bet is to check with others who have similar cars and exhaust setups to see if they pass sound at LCMT or whatever track you're going to. And if you'll be close to the limit, have some turndowns, baffles, or even alternate muffler setups on hand in case you fail sound.
The following users liked this post:
dgrobs (06-15-2023)
06-15-2023, 01:48 AM
#34
RL Community Team
Rennlist Member
Rennlist Member
Thread Starter
stownsen914 is right. Cloud cover, anything will cause changes in readings. Exhaust down-turns can help, preventing exhaust cut-outs helps.
LCMT typically has multiple places where noise measurements are run, and one is mobile.
It is still a great track!
Ray
LCMT typically has multiple places where noise measurements are run, and one is mobile.
It is still a great track!
Ray
The following users liked this post:
dgrobs (06-15-2023)