Laguna Seca Sound Barrier Requirement Concern

scruffydog · 05-17-2012, 12:14 AM

I am planning on going to a HDPE track day at Laguna Seca on July. They have a regulation of 90 dB.

I currently have a Stillen Dual Exhaust paired with Berk High flow cat. I sold my stock exhaust.

Does anyone know if I will pass that regulation? I don't have a sound meter.

Any help? Thanks!

ryan0 · 05-17-2012, 12:49 AM

Quote:

Originally Posted by scruffydog

I am planning on going to a HDPE track day at Laguna Seca on July. They have a regulation of 90 dB.

I currently have a Stillen Dual Exhaust paired with Berk High flow cat. I sold my stock exhaust.

Does anyone know if I will pass that regulation? I don't have a sound meter.

Any help? Thanks!

depends on time of day, weather conditions, etc...

my guess?.. be prepared to sort shift up the hill most of the day..

WWJD · 05-17-2012, 01:04 AM

Only stock exhaust would pass, barely...

scruffydog · 05-17-2012, 01:45 AM

Quote:

Originally Posted by WWJD

Only stock exhaust would pass, barely...

Really? this sucks...i don't have a stock exhaust =/

jr1 · 05-17-2012, 07:46 AM

You'll be fine, that set up when I had it was usually around 87 db, on a wet day.

axio · 05-17-2012, 06:01 PM

You'll be fine. I have the Stillen CBE and Berk HFCs as well and there wasn't any problem.

2004YZFR1 · 05-17-2012, 07:38 PM

Just short shift past the sound shack and pin it everywhere else.

Shamu · 05-17-2012, 10:38 PM

Yeah you should be fine. As you head towards t6 lift as you go by sound shack if you have issues. My Nismo with berk cats and Nismo exhaust had no issue at all. Way below 90 db. If you can fashion a couple of bent stove pipes on tips and face them away from sound shack that might help if you on the edge. Tone of Z however seems to work better than other cars.

scruffydog · 05-18-2012, 11:10 AM

thanks a lot guys...my friend tracks with his 350Z that has straight pipe & Greddy Exhaust and has no problem. I don't know how that compares to the Stillen. I thought Stillen was one of the quieter ones already. But of course I think the Nismo one is a little quieter as it's still OEM factory stuff.
My friend also suggests to build a 90° elbow pipe which can point away from the sound station. HAHA, i might look into that.

I thought the stock one runs around 84 dB.

I contacted Stillen and they replied that it conforms with CA sound laws & any exhaust will be louder than 90 dB with a High Flow Cats.

ryan0 · 05-20-2012, 01:49 AM

Quote:

Originally Posted by scruffydog

My friend also suggests to build a 90° elbow pipe which can point away from the sound station.

away and UP.

bigdog1250 · 04-01-2013, 09:52 AM

Leguna Seca is having a 92 DB day on May 19th. Do you think F.I. non-res will make the cut???

scruffydog · 04-01-2013, 10:55 AM

Quote:

Originally Posted by bigdog1250

Leguna Seca is having a 92 DB day on May 19th. Do you think F.I. non-res will make the cut???

I'd be interested to know too...do you have HFC or TP b/c that would also increase the sound by a bit.

I've been wanting a F.I. non-res CBE for awhile but Laguna is the only reason I didn't swap it. I currently have Berk HFC and Stillen CBE (12" resonator) and it barely meets it. I guess in the near future if I could save up for the F.I. Non-res that can be my everyday setup and the Stillen can be my Laguna setup.

My friend's E92 Dinan Exhaust w/ a straight pipe does not pass the sound check and has to lift off every time at that turn - I guess worst case you can always do that.

Good luck with that!

bigdog1250 · 04-01-2013, 11:19 AM

Quote:

Originally Posted by scruffydog

I'd be interested to know too...do you have HFC or TP b/c that would also increase the sound by a bit.

I've been wanting a F.I. non-res CBE for awhile but Laguna is the only reason I didn't swap it. I currently have Berk HFC and Stillen CBE (12" resonator) and it barely meets it. I guess in the near future if I could save up for the F.I. Non-res that can be my everyday setup and the Stillen can be my Laguna setup.

My friend's E92 Dinan Exhaust w/ a straight pipe does not pass the sound check and has to lift off every time at that turn - I guess worst case you can always do that.

Good luck with that!

Nope, just regular stock cats.

Leguna usually has track days were the limit is in the 80s, but at 92 I'm hoping I'll pass.

Shamu · 04-02-2013, 04:01 PM

All you guys without stock are going to be close to limit or over on a 90 day. 92 days will work typically with some sort of resonated muffler system. Just depends on weather conditions and sound monitoring booth staff.

I bolted my stock muffler on my car with long tube headers and passed 92 db day.

bigdog1250 · 04-02-2013, 06:25 PM

Has anyone on here with F.I. not passed? And if so, what was the limit that day (or better yet what did they measure you at?).

05-17-2012, 12:14 AM	#1 (permalink)
scruffydog A True Z Fanatic Join Date: Jan 2009 Location: Nor Cal Posts: 1,113 Drives: with his eyes close Rep Power: 717	Laguna Seca Sound Barrier Requirement Concern I am planning on going to a HDPE track day at Laguna Seca on July. They have a regulation of 90 dB. I currently have a Stillen Dual Exhaust paired with Berk High flow cat. I sold my stock exhaust. Does anyone know if I will pass that regulation? I don't have a sound meter. Any help? Thanks!

05-17-2012, 01:04 AM	#3 (permalink)
WWJD Enthusiast Member Join Date: Jun 2010 Location: SoCal Posts: 396 Drives: PW 370Z Rep Power: 14	Only stock exhaust would pass, barely... __________________ My Journal #1 My Journal #2 Build by The R's Tuning, Irvine Laguna Seca 1:43.073 (stock power)/ Buttonwillow 13CW 1:59.532 (full exhaust)

05-17-2012, 06:01 PM	#6 (permalink)
axio Enthusiast Member Join Date: Jan 2009 Location: SF Bay Area, CA Posts: 271 Drives: '09 370Z Rep Power: 16	You'll be fine. I have the Stillen CBE and Berk HFCs as well and there wasn't any problem. __________________ GTM Stg II SC w/ Aquamist methanol injection, GTM oil cooler, Berk HFC, Stillen CBE, BC ER coilovers, Hotchkis sways, TWM short shifter, Clutch spring mod, CarboTech XP8s

05-17-2012, 07:38 PM	#7 (permalink)
2004YZFR1 Enthusiast Member Join Date: Apr 2010 Location: Las Vegas Nevada Posts: 308 Drives: 09 370Z yellow,auto Rep Power: 14	Just short shift past the sound shack and pin it everywhere else. osbornsm likes this. __________________ K & N Filters \| HPS silicone air intakes\| Fast Intentions CBE with 18" resonators \|

05-17-2012, 10:38 PM	#8 (permalink)
Shamu A True Z Fanatic Join Date: Jan 2011 Location: Nor Cal Posts: 1,059 Drives: 370Z Racecar Rep Power: 19	Yeah you should be fine. As you head towards t6 lift as you go by sound shack if you have issues. My Nismo with berk cats and Nismo exhaust had no issue at all. Way below 90 db. If you can fashion a couple of bent stove pipes on tips and face them away from sound shack that might help if you on the edge. Tone of Z however seems to work better than other cars. __________________ Grant

05-17-2012, 07:46 AM	#5 (permalink)
jr1 Base Member Join Date: Aug 2010 Location: East Bay Posts: 123 Drives: 09 370z BS 6s Rep Power: 14	You'll be fine, that set up when I had it was usually around 87 db, on a wet day.

05-18-2012, 11:10 AM	#9 (permalink)
scruffydog A True Z Fanatic Join Date: Jan 2009 Location: Nor Cal Posts: 1,113 Drives: with his eyes close Rep Power: 717	thanks a lot guys...my friend tracks with his 350Z that has straight pipe & Greddy Exhaust and has no problem. I don't know how that compares to the Stillen. I thought Stillen was one of the quieter ones already. But of course I think the Nismo one is a little quieter as it's still OEM factory stuff. My friend also suggests to build a 90° elbow pipe which can point away from the sound station. HAHA, i might look into that. I thought the stock one runs around 84 dB. I contacted Stillen and they replied that it conforms with CA sound laws & any exhaust will be louder than 90 dB with a High Flow Cats.

04-01-2013, 09:52 AM	#11 (permalink)
bigdog1250 Track Member Join Date: Nov 2008 Location: San Francisco Posts: 846 Drives: 991.2 GT3 Rep Power: 17	Leguna Seca is having a 92 DB day on May 19th. Do you think F.I. non-res will make the cut??? __________________ 350z / 40th 370z / C6 Z06 / BMW M4 / V10 R8 / C7 Grand Spot / 997.1 GT3 / S2K / Camaro ZL1 / 718 GTS / 991.2 GT3

04-02-2013, 04:01 PM	#14 (permalink)
Shamu A True Z Fanatic Join Date: Jan 2011 Location: Nor Cal Posts: 1,059 Drives: 370Z Racecar Rep Power: 19	All you guys without stock are going to be close to limit or over on a 90 day. 92 days will work typically with some sort of resonated muffler system. Just depends on weather conditions and sound monitoring booth staff. I bolted my stock muffler on my car with long tube headers and passed 92 db day. __________________ Grant

04-02-2013, 06:25 PM	#15 (permalink)
bigdog1250 Track Member Join Date: Nov 2008 Location: San Francisco Posts: 846 Drives: 991.2 GT3 Rep Power: 17	Has anyone on here with F.I. not passed? And if so, what was the limit that day (or better yet what did they measure you at?). __________________ 350z / 40th 370z / C6 Z06 / BMW M4 / V10 R8 / C7 Grand Spot / 997.1 GT3 / S2K / Camaro ZL1 / 718 GTS / 991.2 GT3

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