Solo sound limits?

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DaveMk1
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Solo sound limits?

Postby DaveMk1 » Fri May 06, 2016 10:17 am

Hey all - I'm wondering if we have a sound meter available to us to check on sound levels of the car at our events. I know racing makes noise and that a performance car is usually louder than a street car and I have no issue with that. That said we have a few cars that are loud enough that you can see the starter and course workers quickly covering their ears when the car passes. If a car is loud enough that it makes the course worker rush to cover their ears chances are it's too loud.

I think that most of us would like to do this silly and wonderful sport for a long time to come and not suffer hearing loss and this is what makes me ask the question.

So I guess I wonder if the SCCA has a db limit and if we have a way to test for that limit. I would NOT want to tell a driver they they can't run if their car tests too high but I would feel comfortable telling them they need to address it before they take part in the next event with that car.

Thoughts?

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Re: Solo sound limits?

Postby Jmudge » Fri May 06, 2016 10:45 am

I know there is a 100db sound limit at national events. I think it is a good idea to be honest with you. http://cdn.growassets.net/user_files/sc ... 1458926161
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Re: Solo sound limits?

Postby kjohnson » Fri May 06, 2016 12:50 pm

You can download decibel meters for smart phones, I don't think they're super accurate, but could be close enough for our purposes. If we wanted to buy one it seems like they can be had for less than $100. I think it's a good idea to have some control over the noise.
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Re: Solo sound limits?

Postby DaveMk1 » Fri May 06, 2016 1:21 pm

We had one years ago and I seem to recall it was Russ' or that he'd borrowed it.

Russ?

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Re: Solo sound limits?

Postby rkaiser » Sat May 07, 2016 9:05 am

I have one - might take a while to find it again. If not, I'm sure the phone app will work well enough for our needs. Also need to figure out some standard for testing - distance, idle, under acceleration ...etc
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Re: Solo sound limits?

Postby mdlfCRXs » Sat May 07, 2016 1:20 pm

A CERTAIN fiero perhaps? I find it offensive. In light of complaints in billings that lost a site we should consider it. I don't think we have much trouble in Bozeman. And you know there will be complaints if we use it in Helena. We will have to really publicize its use. It will also require a few monitoring specialists to run the equipment and set it up by the rules. It will take another work station body. SCCA can probably recommend proper equipment. It is an established practice.

Let's see if Russ can find his and we can run some tests. A hearing safety specialist told me if the phone apps are calibrated they can be accurate within 5db. That may be too much error when the readings are close.

Does anyone want to research meters cost and SCCA use?
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Re: Solo sound limits?

Postby DaveMk1 » Sat May 07, 2016 1:58 pm

I'm concerned with not only making so much noise that we lose a venue but also for the health of everyone at an event.

One can't help but notice that there are houses getting closer to Cardinal every year and there are a few not all that far from the Commons and to protect these sites I think we need to be the best neighbors we can be. We are very lucky to have two local sites and it would seem to be a good thing to actively try to prevent any issues that could cause us to lose them. Once gone they are near impossible to get back.

I think the SCCA guidelines Mudge posted a link to are a great reference. I think we should start with their number and if it seems too high or low considering our own situation we can tweak from there.

There are very few cars that would seem to be an issue and yes Loren's race car is one of them......but by no means the only one and it seems like on most cases one could deal with the noise in some simple and unobtrusive way that wouldn't cost too much nor would they rob much, if any, power.

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Re: Solo sound limits?

Postby rkaiser » Sat May 07, 2016 2:10 pm

Amazon has plenty of sound level meters starting at less than $20
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Re: Solo sound limits?

Postby mdlfCRXs » Sat May 07, 2016 2:21 pm

rkaiser wrote:Amazon has plenty of sound level meters starting at less than $20

If one of those meets the criteria as acceptable I say we get one.
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Re: Solo sound limits?

Postby WyMCoupe » Sat May 07, 2016 3:02 pm

mdlfCRXs wrote:
rkaiser wrote:Amazon has plenty of sound level meters starting at less than $20

If one of those meets the criteria as acceptable I say we get one.


http://www.amazon.com/gp/product/B00ECCZWWI/ref=pd_lpo_sbs_dp_ss_1?pf_rd_p=1944687742&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B001THX3M0&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1VV2Y6D438MQHD34K6AS
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Re: Solo sound limits?

Postby DaveMk1 » Sat May 07, 2016 4:12 pm

WyMCoupe wrote:
mdlfCRXs wrote:
rkaiser wrote:Amazon has plenty of sound level meters starting at less than $20

If one of those meets the criteria as acceptable I say we get one.


http://www.amazon.com/gp/product/B00ECCZWWI/ref=pd_lpo_sbs_dp_ss_1?pf_rd_p=1944687742&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B001THX3M0&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1VV2Y6D438MQHD34K6AS


Cool - should I buy that thing? I ask just wanting to be sure that we don't end up with many of them.

Unless someone says not to I think I'll get it and put it in the van for future local use. Cool?

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Re: Solo sound limits?

Postby mdlfCRXs » Sat May 07, 2016 5:35 pm

Do it Dave. Thanks. On the back is a threaded hole. The best news I have seen are set on tripods at a specific ht. Maybe one of the timing light tripods would work.
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Re: Solo sound limits?

Postby Alex » Sun May 08, 2016 5:42 pm

I just so happen to have a spare timing light tri-pod. One of them was damaged (not sure if in shipping, or prior to that), so they sent me another when I ordered the cable for the display. It is still usable however.
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Re: Solo sound limits?

Postby DaveMk1 » Sun May 08, 2016 5:46 pm

Cool - I have the meter on the way. We'll just need to find the proper place to put it.

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Re: Solo sound limits?

Postby DaveMk1 » Sun May 15, 2016 5:52 pm

So just a quick follow up on the sound testing we did on Saturday at the Commons. I set up the meter so it was on the passenger side of the car off in the grass about 40 feet away. We recorded the sound level of each car and the findings were reassuring.

The range was a low in the upper 70's to a high of 102 dB. The SCCA says we should be at 100 dB max at 50 feet so we should be pretty darn close. It was interesting to note that because of the wind (blowing hard past the car and toward the meter) that the base sound level was in the 50's depending on how hard it was blowing. It was also interesting (to me at least) that the quietest car (Tucker's Miata) seemed to make as much tire noise as engine noise. Tucker certainly proves that one doesn't need a loud car to go fast.

The cars that were on the louder end of the scale were just bordering on the "that's a bit loud" feeling but nothing too bad so intuitively if a car seems too loud it probably is.

Lastly - many people were concerned that their car might be too loud.......in fact it felt like those that were the most sure that their car was too loud drove the quietest cars. I have no idea what to make of that.

This is all in an effort to make it safe for course workers and to not annoy our neighbors. It can take VERY little to make a car a bit more quiet and just putting a turn-dwon tip on the exhaust so it points at the ground would do a lot of keep things in check.

We'll do some random spot checks at different local events just to be sure we are in the ballpark and that our participants are safe and those that live and work in the area are happy we are there.

Thanks all -

dave
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Re: Solo sound limits?

Postby Mel Kuipers » Thu May 19, 2016 10:37 am

Thanks for the research data...reassuring for sure, and nice to know we can monitor sound...in Helena we do not have risk with neighbors close by, but it is a hearing safety issue....I did have sore ears one event in Helena when I was starter....well worth addressing so others don't end up with hearing aides like me....my problem came from when I was a kid, and too "tough" to protect my hearing....
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Re: Solo sound limits?

Postby katzenbergerl » Thu May 19, 2016 5:27 pm

Didn't intend to cause so much trouble with my noisy Fiero. Actually was supposed to get a set of mufflers with the car--and the guy has never sent them and a bunch of parts I bought with the car. Will continue to work on it and find another solution if I can't get him to send the parts.

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Re: Solo sound limits?

Postby katzenbergerl » Thu May 19, 2016 5:41 pm

P.S.---I am really not that sensitive----a simple "Your car is annoyingly loud and probably hurts people's ears would have got me to work on it." I don't hear it that loud inside.

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Re: Solo sound limits?

Postby DaveMk1 » Thu May 19, 2016 6:11 pm

Hey Loren -

Thanks for chiming in. Your car is loud but it's not the only one and I suspect over time we will find more than a few cars that are over the limit. That said, based on what we learned at the last event I'd guess that your car is over the limit and could stand to be quieted down a bit. If you are interested we could test your car to see what the level actually is - just let me know.

Thanks and kick some butt this weekend!


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