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Discussion Starter #1
Anyone had their SS on track at Laguna Seca with a stock bi-mode exhaust? If so, any issues with the noise limit?

I’m thinking about making a road trip down there for a track weekend this spring. I’m sure the noise level is fine, but that’s a long way to drive only to have the weekend cut short for a noise restriction.
 

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There is zero chance you will violate any noise restrictions. I have instructed in cars so loud that we could not hear each other on my intercom. Those are the cars at risk.
 

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There is zero chance you will violate any noise restrictions. I have instructed in cars so loud that we could not hear each other on my intercom. Those are the cars at risk.
Thanks Glen! If I go, this will be my first experience with a noise restricted track, so just wanted to get some local confirmation.
 

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What a treat it would be to drive that track for a day! Have fun brother!
Yes, it would be. I’d actually pay the trackside photographer for his shots.

Some friends make a road trip to various NorCal tracks a few times per year. I can’t pass on this one if I can work out the time off from work.

Thanks!
 

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There is zero chance you will violate any noise restrictions. I have instructed in cars so loud that we could not hear each other on my intercom. Those are the cars at risk.
Have you instructed at Laguna Seca? Highway 68 commission has a lot of power out here, and very little tolerance. On the deregulated days I can hear cars on the track at my work 9 miles away and sometimes at my house 12 miles away.

Most folks just know where the microphones are and let off.
 

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Depends where and how they measure. My stock 2015 passed a 96 dB limit at AMP, but I never did find out the actual reading and of course the 2015 doesn't have the bi-modal.
 

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Some tracks are measuring engine db only. That is the norm in my experience.

But some communities and some tight butt local folks go with total noise. Tires, aero, and engine generated noise.

The distance from the vehicle the measurements are taken matters.

At our local autocross site there are one or two locals who go out and make their own measurements. The AX site if perfectly level (old airport) and the fences at which locals measure are distant from the pavement, and no hills to create echoes . We have yet to have any issues. Some of the newer p-cars with sport exhaust are almost painfully loud at full throttle (they make my bi-modal 2016 sound like a putt putt) when they go by flagging/work stations, and there has never been an issue with the sound levels at the site.

When the measurements are made dynamically there is ambient noise and multiple vehicles running simultaneously.

Most street legal exhausts pass most reasonable db tests.
 

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Yes, it would be. I’d actually pay the trackside photographer for his shots.

...
Don't forget to take your (or rent a) GoPro camera. Having footage of your laps is a priceless keepsake and a great way to re-experience it for years to come. Lots of info on how to get a great setup to capture your day.

.
 

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Don't forget to take your (or rent a) GoPro camera. Having footage of your laps is a priceless keepsake and a great to to re-experience it for years to come. Lots of info on how to get a great setup to capture your day.
Ain't that the truth!

I have search You Tube to catch a glimpse of myself in any of the races I drove in. I've only found 2.:crying How I wish that I thought ahead and arranged something like that to look back on.:frown
 

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Discussion Starter #12
Good advice on a GoPro. I tried filming some laps with my phone a few weeks ago. I posted one lap from the session in this sub-forum. Among other things, the phone camera lens field of view is too narrow to get a feel for the track.
 

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We measured in-cabin sound levels, as we always do, and over coarse chip at a constant 100km/h, the noise, mainly tyre roar, was a respectable 73dB. Then we buried the loud pedal and the full 6600rpm V8 symphony registered 82 glorious decibels.
https://www.stuff.co.nz/motoring/75354761/feel-the-noise-of-the-holden-commodore-vf-ii-ss-redline

90db is still 8x louder than 82db, but that's in cabin and I assume windows up, because it wouldn't make sense to get an in-cabin reading otherwise. I would try to find a local sound meter to get a reading. Some smartphone apps can be surprisingly accurate when combined with external mics.
 

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Some tracks are measuring engine db only. That is the norm in my experience.

But some communities and some tight butt local folks go with total noise. Tires, aero, and engine generated noise.

The distance from the vehicle the measurements are taken matters.
Yes, it does. No experience with Laguna Seca, but next to AMP on the east side is a golf course. There are two microphone locations. One is on the main straight on the side away from the golf course. The other is at the east property line along the back straight. The back straight is usually cordoned off all day with cones so that you have to go single file, as far west and away from the golf course microphone as possible. That 25-30 feet apparently makes a big difference.

The track workers tell you to make sure you are at "full chat" going past the first microphone during the sound check lap, so that if you register over, they can wave you off before you get to the back straight. No fines for the front microphone, but if you fail it you can't use the track. If you go over the limit on the back straight, I believe it is a $500 fine per instance.

A lot of folks going to AMP bolt on right-angle exhaust tips, to try to fling the sound away from the microphone on the back straight.
 

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Have you instructed at Laguna Seca? Highway 68 commission has a lot of power out here, and very little tolerance. On the deregulated days I can hear cars on the track at my work 9 miles away and sometimes at my house 12 miles away.

Most folks just know where the microphones are and let off.
Mazda Raceway Laguna Seca was built in 1957, way ahead of probably many surrounding homes out there; and people that move close by and then go complain about noise levels at the track should have their heads dunked in barrel of ice water. We've had that crap here too. Idiots buy a house next to the freeway and whine and cry so much that sound barriers are put up on the taxpayers dime. Makes me gag. Nobody put a gun to their head and forced them to live there, so why are they allowed to make a stink about noise levels? I don't know what's worse, the crybabies whining about it, or the politicians that actually put up with it. Pathetic. The OP wants to go have fun at a fabulous track and has to worry about noise levels? Good grief. To heck with them all brother, go have fun and don't worry about it.
 

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I have many, many years of laps at Laguna Seca under my belt. A stock SS in perf mode will have no problem passing the dB test. A SS with headers and fee flow exhaust should pass. I have had cars with near open exhaust on track and no issues.

The SCAMP (Sports Car Racing Assoc of Monterey Peninsula) officials are always very easy to work with, really want you to have a good time, and to come back again. One thing that will get you in quick trouble is not following instructions. If they tell you to do something, do it right away, don't question them. I have seen a few people over the years escorted from the track and asked to never return. Follow rules, have fun = good time for all.
 

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Man I must have gone on the days where they were really anal. They were sweating stock cars when I went.
 

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Discussion Starter #19
Thanks all. It’s an NCRC event that I’m looking at.

Two consecutive days on track makes it worth the 30 hour round trip drive there and back, but only if I actually get to drive the full two days. Sounds like consensus is that I should be fine.
 

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Mazda Raceway Laguna Seca was built in 1957, way ahead of probably many surrounding homes out there; and people that move close by and then go complain about noise levels at the track should have their heads dunked in barrel of ice water. We've had that crap here too. Idiots buy a house next to the freeway and whine and cry so much that sound barriers are put up on the taxpayers dime. Makes me gag. Nobody put a gun to their head and forced them to live there, so why are they allowed to make a stink about noise levels? I don't know what's worse, the crybabies whining about it, or the politicians that actually put up with it. Pathetic. The OP wants to go have fun at a fabulous track and has to worry about noise levels? Good grief. To heck with them all brother, go have fun and don't worry about it.
Part of the trouble is that Laguna Seca is a publicly owned park and beholden to the local tax payers and park regulations. Unfortunately this relationship means that the park system keeps them afloat but also holds them back from being a truly great experience. Many private investors have tried to buy them, but it never pans out. The politics around Laguna Seca is totally mind numbing. I know enough folks to have worked there ( I almost did) and had some "3 beer conversations" with enough SCRAMP board members to know that it's a pretty unfortunate cycle they are trapped in.
 
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