Originally posted by Darkane
Although this is good advice, part throttle will be your best bet.
R - are there any sort of soft rules for BONE STOCK cars that may potentially break the DB rating?
The rule is pretty straight in that you have a reading from the sound meter and that is it. The meter is set to "slow" setting (otherwise we would have a lot of vehicles over), 50' perpendicular to where the cars will be passing by (conceivably located where they would be at full throttle), at a height of 3-4', ANSI B (?) std.,
Bone stock cars blowing over? Yes, the Corvettes with the flaps opening in the exhaust will blow over and I know there are at least a couple of locals who have fixed them shut and I believe one other car that I don't recall. That is one option on some high perf. cars currently available that can be fixed fairly easily from what I understand. I know Tom will be there with his 'vette and has done that to his.
BTW, I like loud exhausts too (pleasant ones that is .. unlike, say, an open exhaust rotary which can be really shrill and just plain noisey), however, we have the issue of losing sites due to loud exhausts (one of the key reasons). But there is also the damage to our ears that we can do via the loud exhaust ... and I mean the workers on the course.
I have an Invidia cat-back exhaust (stock cat is still there) on my street S2000 and it has a removable cap on the end ... which lowers the db. by about 2-3 db making it easily "legal". Without the cap, it has blown aruond 92.5-92.8 db. as per SCCA regs at San Diego numerous times. There is some variation with weather/ambient conditions.
However the exhaust without the cap I find just plain annoying on the street and highway because I have a hard time hearing the stereo since it is "so" loud (even with the convertible top up). And, like I said above, it has been measured almost exactly at the limit of 93 db. (or rather just under). So, really in the real world, why would you want to "live" with such a loud exhaust anyway? I also realize when I was younger I preferred louder exhaust than I do currently but maybe some of that was the lower tone of a V-8 exhaust instead of my 9000 rpm S2k?
Remember also, that once your ears are damaged (all you rock 'n rollers), they do not heal. Hearing loss is permanent. Even work places have health regulations for loud environments, ear protection, etc.
So, you might say, in a number of ways, sound limits make a bunch of sense. At least that is the way I see it fwiw.
Does that make sense?
I am also thinking of bringing my car out so we can use it to test the sound meter and the lot environment since I have used it repeatedly over the years at various SCCA events and normally record 92.5-93 db. I do not recall it ever being above and have never had to modify the exhaust so it would be a good measuring stick.
"I don't look for something; I find something" - Picasso
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