Charley Hoyt

Will a stock LS3 C6 with dual mode exhaust meet the 90 db sound limit at Laguna Seca?

Thanks,
Charley

63Corvette

Charlie I think only wheelchairs, soapbox racers, and prams meet the 90db limit. 90db is really quiet

AU N EGL

if 90dbs is the limit, do the locals stop ppl from blowing horns ?

TNTC4VETTE

Wow, I thought AMP's 96db ruling was bad.

moose.b3

When I went to Laugna Seca 3 months ago, I wired the baffles closed. I have the modded mufflers and knew it was too loud with 98db. I know they have different limits with different events,but with H.O.D. the limit was 92 db. It did seem that a few cars were louder than 92 db and nobody was black flagged.

btlgrd

AMP's noise limit is 98db.

jcosta79

Not to stray off topic, but were you trying to search for a different webpage when you typed the title for this thread?

Crepitus

How its measured has a lot to do with it. If its 6' from the end of the pipe they wont be able to mow the grass. If its behind pit wall....

Crepitus

How its measured has a lot to do with it. If its 6' from the end of the pipe they wont be able to mow the grass. If its behind pit wall.... The local short track here was built in 1948 Now we have a housing development near buy and a budget for noise litigation. There lawn mowers and air conditioners cause about 5X the noise in their neighborhood. Exhaust pipe termination has a big effect on perceived noise. If you can swap a cat back on for track day use that dumps with turn downs near the rear diff it should help a lot. For stop n go traffic, maby not.

ed Sorry bout the dup post

Charley Hoyt

Oops, my I pad self corrects some words....I guess it didn't like Lauguna and corrected it, and I didn't notice.

Screamin Z

Only a tesla would pass the sound limit.

dbratten

You should be fine although you may need to keep the baffles closed. On some days, due to weather, sounds will register higher. But typically, a stock C6 Z06 will pass.

Sound is measured in the hut to the right side of the track between turns 5 & 6 -- an uphill climb. You can see it on most videos. Short shifting or letting off the gas will allow most street cars to pass. Others have created an LS exhaust that directs the sound down and to the left to be able to remain at full throttle.

Have fun out there.

Bedouin

Charley, you'll be just fine. I drove L-S twice in the last couple months; '12 GS w/ stock LS3, 6spd & NPP with the exh flaps wide open the entire time & had no noise violations whatsoever.

There was an LS2 with Z06 headers & really loud BB Fusions & he just backed off the gas after T5 & I don't think they gave him any violations either. Have fun!

TNTC4VETTE

Sorry about the 2db shortchange. My car fails anything below 100 anyhow. Most of us have to lift at Roebling, and it's 103.

Charley Hoyt

Thanks for all of the help.