Noise measuring SFC1000 with Jota cans.

There is apparently a huge crackdown on the US auto modification industry by their EPA including Motorcycles, huge business closing fines happening for supplying gear that modifies engine performance, CPUs, Chips and Exhausts plus lots more. Its shocked lots involved. The 2nd link is easier to digest.



Recognizing the Protection of Motorsports Act (RPM Act)

SEMA STATEMENT ON THE STATUS OF THE RECOGNIZING THE PROTECTION OF MOTORSPORTS (RPM) ACT DIAMOND BAR, Calif. (Dec. 22, 2022) – SEMA and PRI must share that despite strong Congressional backing and extraordinary support from the racing community, the 2021-2022 Congressional session is ending...
www.sema.org www.sema.org

www.whichcar.com.au

How the US aftermarket is fighting back against the EPA

The Recognizing [sic] the Protection of Motorsports Act is currently being considered by both the US Senate and House of Representatives
www.whichcar.com.au www.whichcar.com.au
 
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It's the same old story with everything I guess. A minor bending of the rules is usually tolerated but there is always a minority that go well beyond what will be tolerated (a certain brand of m/c comes to mind) and everybody is affected by the resultant clampdown.
 
I was told by a RWC tester that the rules for club permit vehicles changed from club tester to official RWC because of the insane things the hotrod community were putting on the street. If there's one thing that the 'certain brand of motorcycle' (and their Japanese counterparts) needs to have curtailed its the insane db they produce when the idiot owners put shotgun pipes on them. I hear them from about 2km away playing drag racers along Bell St. I don't think an unbaffled SFC 2/1 would even come close.
 
Vince said:
There is apparently a huge crackdown on the US auto modification industry by their EPA including Motorcycles, huge business closing fines happening for supplying gear that modifies engine performance, CPUs, Chips and Exhausts plus lots more. Its shocked lots involved. The 2nd link is easier to digest.



Recognizing the Protection of Motorsports Act (RPM Act)

SEMA STATEMENT ON THE STATUS OF THE RECOGNIZING THE PROTECTION OF MOTORSPORTS (RPM) ACT DIAMOND BAR, Calif. (Dec. 22, 2022) – SEMA and PRI must share that despite strong Congressional backing and extraordinary support from the racing community, the 2021-2022 Congressional session is ending...
www.sema.org www.sema.org

www.whichcar.com.au

How the US aftermarket is fighting back against the EPA

The Recognizing [sic] the Protection of Motorsports Act is currently being considered by both the US Senate and House of Representatives
www.whichcar.com.au www.whichcar.com.au
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That will probably be put to the test by someone who claims it violates their something amendment rights, like how they got rid of helmet laws in some states (the ones where organ transplants are easiest to get).
 
Tippie said:
That will probably be put to the test by someone who claims it violates their something amendment rights, like how they got rid of helmet laws in some states (the ones where organ transplants are easiest to get).
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taking about amendments I remembered this comedian:


Less of a show but worth watching, here is the longer, more serious version:

 
Cam has a good handle on the "SPL" calculations, not only just a matter of Sound Pressure Level, it is the frequency/spectral content, low frequencies have a different SPL than Higher Frequencies, as a guide. Engineering grade SPL measuring equipment have in built "weighting" filters, producing different measurement readings for a sound source being measured. There needs to be a stated weighting curve selection in the measuring procedure. Used to test 80-120Kw sound systems, if you did that with white noise, would be meaningless, let alone the racket ( like steam train blow offs ) a weighted filter was applied to the white noise, and a resultant equal energy per octave output applied, you still had the high frequency content, though this time you had the earthquake as well, open air festivals near occupied high rise were not pleased... not sure it helps this post, save for making certain a SPL test has suitable stated and applied weighting in your country. j
 
I think I still have a Brüel & Kjær sound level meter somewhere, from my days of working with acoustics and vibration. It's probably buried amongst other forgotten stuff under the house. Like my old drawing machine. I'll see if I can find it.
 
Lovely old style German engineering, W and G another of the notable mechanical style precision instruments... glad to have rooms full of that equipment as playground, in the day. Really was the very best and highest standard of training in the day. The B and K had robust mechanicals, big golf ball foam shield, large clear readout and dial.... nostalgia attack here....j
 
Legs said:
When I moved interstate to South Aus the RGS had to 'go over the pits' to change over to SA rego.
The bike is fitted with 'Staintune' mufflers which are a bit louder than standard.
The exhaust volume was measured with a microphone mounted at about a 75 cm above the ground placed at 45 degrees to the pipe at around 1.5 metres distant. The book said that the bike had to be measured at 5000 rpm and not to be greater than 86 db, the bike came in at 83 which was well within the limit.
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When Marty transferred ownership of the ex-Paul Casson RGS it went within 0.1 decibel of the limit of 94db. Had flat-slides on it bythat time so a lot of induction noise
 
Absolutely all about the lower frequencies. Noise meter at Phillip Island hated big twins (mine!) but a screaming 4-cyl 600 at 14,000RPM while sounding horrendously loud, wouldn't be setting off the alarm bells. Bass drum effect from outdoor rock concerts a perfect example.
 
Solo crashes are the exception in California, most involve a car or truck as well. And very rarely is the biker at fault. I would expect other states to be similar.
 
Ahhhh, the good old days! LOL! In 1979 I had a Moto Guzzi Lemans with the factory race kit fitted, and I rode it every day to work. It was not even as loud as the average Harley was at the time, unless I lit it up around 7500 rpm, then those factory pipes would really talk!! Went through Temple, Texas one day at about 100mph on I-35, saw a cop going the other way on the other side of the concrete barrier! I ripped on out of town and pulled in to the roadside stop about 4 miles north of town and waited. About 5 minutes later, cop pulled in and wanted to know what I was up to, I told him that I had been there about 30 minutes, taking a rest, but some crazy on a loud motorcycle had gone past a few minutes ago, screaming along at an extremely high rate of speed, headed north! He looked at me for a second, them jumped in his car an took off with his light on. I laugh about that every time I think about all the other times I got tagged for speeding back then!! Good Times!!! I still have that bike by the way.
 
Sounds like a certain SFC triple owner who had the same thing happen on a club ride. Just after the cop went past the other way and did a U-turn this smarty did his own U-turn and disappeared for a while. One bloke got the fine and the rest of us got a finger wage and got asked about Mr smartys U-turn. He came back when the cop left laughing his arse off. BTW this was a piddling 120ks in a 100 zone in the middle of nowhere, bloody stupid Vic Cops.
 
I saw my first two noise meters by the road in a village in Suffolk yesterday - no idea why they were there by a road junction but we have seen newspaper articles about noise cameras being on the way - it wasn’t a busy road and certainly not a bike sort of place !
 
Personally, I applaud noise cameras being introduced, they're long overdue.

The irresponsibility/inconsideration shown by many drivers/riders when passing through the hamlet in which I live has to be experienced to be believed! At times you could imagine being a spectator at a top-level motorsports event.

It's not only speeding crotch rockets and trundling cruisers with noisy 'zorsts, also lots of super/hyper cars tearing through in 2nd gear with revs bouncing off the limiter, as well as local heroes in their hatchbacks with fart cans. This has been steadily increasing over the past 10-15 years, especially with the advent of electronically controlled exhaust flaps, I'm well and truely fed up!

If I had wanted to experience F1/MotoGP "feeling" each and every sunny weekend, I would have looked to buy a property close to a race track, but I chose peace and quiet. Approx. 1200 vehicles passed through per 24 hours when I moved here early '90s, it's now over 7000/24h. I know I can't stop "progress", but this is getting to be ridiculous. Local government is unwilling to impose stricter legislation such as lower speed limits (votes being more important than human well-being), the traffic situation in my area is horrific. Next to being a favourite amoungst Weekend Warriors, the route is used as a detour from the major slow-moving trunk roads during the week.

What the fuck is so difficult in rolling off the gas as soon as buildings/settlements come into view? And stay off it as long as you're passing through? I say bring them on... even if I might get nabbed myself somewhere along the way. Most of my bikes are quite noisy, but I do try to behave/contain myself accordingly. Doesn't seem to be the case for very many others though...:mad:

piet
 
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There are a couple of good bike roads I do a lot that have tiny settlements, it's smart to just trundle though. Ride like an idiot produced complaints which attract cop attention. It's not hard as it's a few 300m bits on a 50k ride.
 
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