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      11-16-2013, 08:50 AM   #1
wjk_glynn
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Does the Performance Exhaust (PE) pass Laguna Seca's 92 dB sound limit?

Has anyone had problems passing the 92 dB sound limit at Laguna Seca with the PE installed?

Some stock cars (e.g. GT3RS) have trouble with that limit and after reading about the PE's enhanced sound, I wonder if it trips that limit...

Thanks.

Karl.
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      11-16-2013, 09:40 AM   #2
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Didn't even know a race track had such restrictions? Is that just for production cars?
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      11-16-2013, 09:51 AM   #3
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Quote:
Originally Posted by pj.rodriguez View Post
Didn't even know a race track had such restrictions? Is that just for production cars?
No it has to do with the fact some tracks are built near residential areas that have rules against sound bs limits during certain times of the day. They may lift those restrictions on certain official race days.

OP you should be fine. The peformance exhaust is loudest during start up but once fully warmed up, coming down the main straight you should be fine. It's nowhere near as loud as a V8 with straight pipes. Worst case you can granny shift right before the db reader, haha.
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      11-17-2013, 12:24 AM   #4
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Quote:
Originally Posted by 3002 Tii View Post
...OP you should be fine. The peformance exhaust is loudest during start up but once fully warmed up, coming down the main straight you should be fine. It's nowhere near as loud as a V8 with straight pipes. Worst case you can granny shift right before the db reader, haha.
Laguna Seca (unfortunately) has been on the receiving end of a successful lawsuit regarding noise pollution by local residents (i.e. the Hwy 68 Coalition, led by Mike Weaver).

The track is only allowed a small number of unrestricted days (which are used for professional races such as ALMS), there's a few more 103 dB days for SCCA races and the like. But all other days (e.g. HPDEs) have the super tight 92 dB restriction. A result of the lawsuit is that besides a sound booth (between T5-T6), there are "roving" checkers as well

Some unmodified stock cars (e.g. 997 GT3RS, C6 Z06) can trip the 92 dB limit, and many aftermarket exhausts (e.g. TechArt, Tubi, etc.) will definitely cause you to get meat-balled.

So I don't know if it's a given that the 135i PE will get by - probably, but it'd be nice to have confirmation.

Hence my enquiry to see if someone here has actually run with the 135i PE at Laguna, and know if they consistently meet the limit.

Karl.
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      11-17-2013, 07:04 AM   #5
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92 is pretty low. I'm curious to see if it would pass. Limit at LRP is something like 100 or so.
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      11-17-2013, 09:47 AM   #6
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I doubt you'd have any issues, but next weekend I'll be at Sonoma and our club is encouraging us to get sound checks there because Laguna Seca only released 90db days to clubs next year, and a lot of people are worried they won't be able to meet that. I'll see what the stock exhaust is (I'm almost certain it's not more than mid-80s). The PE isn't supposed to be much louder at operating speeds, just on start up, like 3002tii said, or at least that's my understanding.
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      11-17-2013, 10:18 AM   #7
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There was a lawsuit eh? ... That's not too nice. Not like they're racing at 11:00 pm. Theres a dirt oval near where I live and there is definitely no dB restriction! That stuff is so loud! haha.

I figured that the restrictions were lifted on ALMS weekends etc. That was my next question.

But back to topic, I'm sure the PE for the 135 will be okay. Unless they're measuring the sound right next to your pipes, you should be fine.
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      11-17-2013, 01:15 PM   #8
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Quote:
Originally Posted by wjk_glynn View Post
Has anyone had problems passing the 92 dB sound limit at Laguna Seca with the PE installed?

Some stock cars (e.g. GT3RS) have trouble with that limit and after reading about the PE's enhanced sound, I wonder if it trips that limit...

Thanks.

Karl.
Yep, even on 90db days you'll be fine. I have the same exhaust and asked them to test me I was in the 85-88 range at WOT from 50ft.

Note the sound meter is right after turn 5, and I've never seen a "roving meter" there.
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      11-17-2013, 07:23 PM   #9
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Quote:
Originally Posted by blutattoo View Post
Yep, even on 90db days you'll be fine. I have the same exhaust and asked them to test me I was in the 85-88 range at WOT from 50ft.
Thanks and good to hear. Appreciate the update.

Quote:
Originally Posted by blutattoo View Post
Note the sound meter is right after turn 5, and I've never seen a "roving meter" there.
There's an interesting write up about the sound booth at the following link:

http://www.southbayriders.com/forums/threads/59281/

Theres a few comment like
  • "They also send out a mobile mic to catch any sand baggers that are really blowing sound everywhere except at the sound booth"
  • "I worked with Betty at turn 5 one year during a track day... They know what pipes are too loud and what aren't... they will focus on you more and will send out the mobile unit."

Like yourself I haven't seen that actually happen, but I'd heard that on occasion it does.

Karl.
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      11-17-2013, 07:51 PM   #10
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You won't trip at 92 DB.
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      11-17-2013, 09:25 PM   #11
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Quote:
Originally Posted by mb135is View Post
92 is pretty low. I'm curious to see if it would pass. Limit at LRP is something like 100 or so.
I thought LRP was much more restrictive. A quick google says LRP is 87 for BMW HPDEs and in 2011 it varied by club (not sure if these are the latest):

86 db N.E. Region Quattro Club
88 dB Porsche Club Day
105 dB Porsche Race Day
87 dB BMW Club
86 dB PDA non-race
86 dB SCDA
88 dB Lime Rock Drivers Club
105 dB Tuesday afternoon Test & Tune
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      11-17-2013, 10:52 PM   #12
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Quote:
Originally Posted by 3002 Tii View Post
No it has to do with the fact some tracks are built near residential areas
No. It has to do with idiots building houses around existing race tracks and then feel hard done by when they hear racing going on. I *hate* people like this....

Laguna Seca raceway:
Opened: November 9, 1957
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      11-18-2013, 09:37 AM   #13
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Quote:
Originally Posted by int2str View Post
No. It has to do with idiots building houses around existing race tracks and then feel hard done by when they hear racing going on. I *hate* people like this....

Laguna Seca raceway:
Opened: November 9, 1957
Yeah, I really dislike people like this as well.

Similar thing happened where I live with a highway construction project that was going on for 50 years. Everyone knew where the road was going to be, yet people like that kept buying property along the proposed route and then suing when they were up for demolition.
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      11-18-2013, 10:11 AM   #14
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Quote:
Originally Posted by TheSt|G View Post
Yeah, I really dislike people like this as well.

Similar thing happened where I live with a highway construction project that was going on for 50 years. Everyone knew where the road was going to be, yet people like that kept buying property along the proposed route and then suing when they were up for demolition.
That's either their stupid fault for buying there, or a very smart choice to have reason to sue after.... Either way, building a subdivision around a race track is very ill advised.... Why do you think Mosport is in the middle of effin nowhere haha. The only accommodation near by is at the race track camp ground! haha Can't wait for track days 2014. I'm aching.
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      11-18-2013, 06:45 PM   #15
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Quote:
Originally Posted by jkoral View Post
I thought LRP was much more restrictive. A quick google says LRP is 87 for BMW HPDEs and in 2011 it varied by club (not sure if these are the latest):

86 db N.E. Region Quattro Club
88 dB Porsche Club Day
105 dB Porsche Race Day
87 dB BMW Club
86 dB PDA non-race
86 dB SCDA
88 dB Lime Rock Drivers Club
105 dB Tuesday afternoon Test & Tune

Yep good find. I remember when it became an issue. We all got scared of being dinged, but I never really heard of it happening.
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      11-18-2013, 07:32 PM   #16
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Laguna Seca once again under threat of closure.

it appears the Hwy 68 Coalition headed by Mike Weaver (it's really just 7 vocal home owners who moved into the area POST Laguna Seca raceway's existence) are yet again pushing to get Laguna Seca closed permanently.

Mr. Weaver wants the sound enforcement down to 90db (for 2013) and has initiated another lawsuit with the county under "environmental impact" to get the race track closed once and for all.

Most unmodified street cars will not pass 90db at full throttle - and motorcycles for sure will never be able to pass.

Mr. Weaver's mission is driven by his brother's death in 1978 -- his brother chased the family dog (assumed got spooked by the noise of a car leaving the raceway onto Hwy 68) into the road and got hit by another vehicle. Hence the birth of the Hwy 68 Coalition. Although I sympathize with Weaver's lose, he clearly has misguided motives and is looking for something or someone to blame ... unfortunately that is everyone that wants to race at Laguna Seca.

I encourage those interested in racing at Laguna Seca please contact the Highway 68 Coalition to obtain more information and their point of view and additional details on their mission.
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      11-19-2013, 01:36 PM   #17
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Quote:
Originally Posted by pixelblue View Post
it appears the Hwy 68 Coalition headed by Mike Weaver (it's really just 7 vocal home owners who moved into the area POST Laguna Seca raceway's existence) are yet again pushing to get Laguna Seca closed permanently.

Mr. Weaver wants the sound enforcement down to 90db (for 2013) and has initiated another lawsuit with the county under "environmental impact" to get the race track closed once and for all.

Most unmodified street cars will not pass 90db at full throttle - and motorcycles for sure will never be able to pass.

Mr. Weaver's mission is driven by his brother's death in 1978 -- his brother chased the family dog (assumed got spooked by the noise of a car leaving the raceway onto Hwy 68) into the road and got hit by another vehicle. Hence the birth of the Hwy 68 Coalition. Although I sympathize with Weaver's lose, he clearly has misguided motives and is looking for something or someone to blame ... unfortunately that is everyone that wants to race at Laguna Seca.

I encourage those interested in racing at Laguna Seca please contact the Highway 68 Coalition to obtain more information and their point of view and additional details on their mission.
My limited understanding of the laws in effect, which obviously are subject to political influence and therefore are not ironclad, suggest that people moving into the area are doing so knowing of a pre-existing "nuisance" which means they can't sue. They can however sue to make sure MRLS is only holding the allowable number of events, etc... which I believe is why they are releasing fewer high-decibel limit days next year.

Source of pixelblue's post above I believe is Doug from Trackmasters from late 2012.

It sounds to me like we just need to get those 7 vocal homeowners out onto the track and into the massive history of Laguna Seca.
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      11-19-2013, 10:26 PM   #18
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I believe that Sonoma aka Infinion aka Sears Point has similar issues. The problem is not with the houses close to the track. It's that the houses close to the track belong to multi-millionaires and they can afford to drag the tracks through legal proceeding after legal proceeding. They oughta spend their trust funds on a freakin track car and come join in the fun!

On a side note if you've ever flown out of John Wayne Airport in OC they do the same shit. The plane throttles down so they don't disturb the high dollar neighborhoods on take off. I mean come on it's not like these places appeared overnight.
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      11-20-2013, 04:28 AM   #19
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Quote:
Originally Posted by blutattoo View Post
Yep, even on 90db days you'll be fine. I have the same exhaust and asked them to test me I was in the 85-88 range at WOT from 50ft.

Note the sound meter is right after turn 5, and I've never seen a "roving meter" there.
I run the Dinan exhaust and have never tripped the sound meter even on 90db days. Agree that you'll be fine. And there is no roving meter. It's always at the exact same spot.

Note that for next year, Laguna Seca is changing rules for clubs and will have significantly less 92, 100, 105 dB days and have changed most days for regional clubs to 90dB. Some of the national clubs may get a 92 dB day or the rare 100 dB.

If you do trip at LS, you have to show some sort of physical modification to get back on the track. If you're really concerned, buy 2 right angle pipes from Home Depot to clamp over your exhaust and point them toward the driver side (away from sound check). You get 3 laps for sound check, where you won't do WOT at turn 5, then you'll get back on the track.

By the way, you'll see some funky setups on the loud cars to pass restrictions. I've seen extended pipes, right angle bends, 2nd mufflers, multiple 2nd mufflers for each exhaust tip (most is 4) that were tied to the trunk of an old Vette and a lot of people lifting.

It's unfortunate they put a golf community so close (right over the hill).
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      11-20-2013, 11:16 AM   #20
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Quote:
Originally Posted by fboutlaw View Post

By the way, you'll see some funky setups on the loud cars to pass restrictions. I've seen extended pipes, right angle bends, 2nd mufflers, multiple 2nd mufflers for each exhaust tip (most is 4) that were tied to the trunk of an old Vette and a lot of people lifting.
This one is my favorites in our club:

It has something like 500 horsepower, runs slicks, and weighs about the same as a stripped Miata. I think it runs something like low 1:30s at LS.
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      01-27-2014, 04:35 PM   #21
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Any update on this? I want to attend a LRP Drivers Education day and the restriction is going to be 86dBA. Has anyone gotten a confirmed reading? Should i be worried about having an issue?
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      01-27-2014, 05:09 PM   #22
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Any update on this? I want to attend a LRP Drivers Education day and the restriction is going to be 86dBA. Has anyone gotten a confirmed reading? Should i be worried about having an issue?
Just do what most people do and lift off a bit by the sound booth.
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