Originally posted by cstmwgn
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I'm at 107, they'd like 103 but the line is 105. With that said, I know where the measuring point is - in fact, PIR is really clear about it - and I should be fine. Worse case I put the limiter at 4800 for the track sessions. That said, I shouldn't need to. The key phrase below - keep in mind that I'll be in a group of cars and honestly, the new Mustangs are louder...
and here's the rule
https://portlandraceway.com/?/about/noise_information
and the key phrase
HOW PIR MONITORS SOUND LEVELS:
PIR operates a fixed microphone, 50 feet from the track, just past the bleacher on the front straight. This spot was chosen by an independent noise consultant to best capture highest sound levels from the various kinds of events held at PIR.
The microphone is attached to a digital sound meter. The data is recorded 24/7 as is audio recordings over the set limit. All the noise files are held, and given to the City's Noise Control Officer on request.
In addition to the fixed monitor, user groups are required to have a person in charge of events to monitor sound levels and remove vehicles from the track that exceed the limit (NOTE: that for all motorsports events, the top limit used is 103 dBA, rather than the City Code 105 dBA as it has been found to be closer to the ratio of 65 in the neighborhood). Typically, a vehicle that exceeds the limit is black flagged (taken off the track) and given one chance to make modifications or repairs to be below the limit. A second violation will mean a car will be removed from the competition or event for the rest of the day. On a following day, the vehicle in violation must re-tech, show what was done to remedy the violation, pass tech, and be re-checked on course via the sound monitor. If the vehicle fails again, it is disqualified from the entire event.
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