MRLS 90dB sound limit: will pass?
#16
EvoM Guru
iTrader: (1)
The ground absorbs some of the sound. When the sound waves reflect off the ground, they reflect with a percentage of their original energy. Thus reducing sound..
#19
I'm trying to get my car quiet enough to run Sonoma and Laguna Seca. A very unscientific test (dB meter at side of road) shows I'm right around 93dB at full tilt, in 3rd gear.
While researching options, I came across a sprial-flow bullet muffler from Moroso that the GASS guys use to run at Sonoma. I'm also looking at two mufflers that have an offset inlet and centered outlet. Both are physically larger than my current straight-through Magnaflow using a L x W x H method. 617-681" vs the 616" of my Magnaflow.
I also have a 4" 90-degree bend to clamp onto the muffler for Laguna Seca, but if I can NOT use it, that would be greeeeat. Plus that wouldn't solve my problem at Sonoma.
I'm okay with loosing some power, running less boost, etc as long as I can pass without having to lift, worry, blah blah.
So, has anyone had success with any of these items?
While researching options, I came across a sprial-flow bullet muffler from Moroso that the GASS guys use to run at Sonoma. I'm also looking at two mufflers that have an offset inlet and centered outlet. Both are physically larger than my current straight-through Magnaflow using a L x W x H method. 617-681" vs the 616" of my Magnaflow.
I also have a 4" 90-degree bend to clamp onto the muffler for Laguna Seca, but if I can NOT use it, that would be greeeeat. Plus that wouldn't solve my problem at Sonoma.
I'm okay with loosing some power, running less boost, etc as long as I can pass without having to lift, worry, blah blah.
So, has anyone had success with any of these items?
#20
Evolving Member
I'm trying to get my car quiet enough to run Sonoma and Laguna Seca. A very unscientific test (dB meter at side of road) shows I'm right around 93dB at full tilt, in 3rd gear.
While researching options, I came across a sprial-flow bullet muffler from Moroso that the GASS guys use to run at Sonoma. I'm also looking at two mufflers that have an offset inlet and centered outlet. Both are physically larger than my current straight-through Magnaflow using a L x W x H method. 617-681" vs the 616" of my Magnaflow.
I also have a 4" 90-degree bend to clamp onto the muffler for Laguna Seca, but if I can NOT use it, that would be greeeeat. Plus that wouldn't solve my problem at Sonoma.
I'm okay with loosing some power, running less boost, etc as long as I can pass without having to lift, worry, blah blah.
So, has anyone had success with any of these items?
While researching options, I came across a sprial-flow bullet muffler from Moroso that the GASS guys use to run at Sonoma. I'm also looking at two mufflers that have an offset inlet and centered outlet. Both are physically larger than my current straight-through Magnaflow using a L x W x H method. 617-681" vs the 616" of my Magnaflow.
I also have a 4" 90-degree bend to clamp onto the muffler for Laguna Seca, but if I can NOT use it, that would be greeeeat. Plus that wouldn't solve my problem at Sonoma.
I'm okay with loosing some power, running less boost, etc as long as I can pass without having to lift, worry, blah blah.
So, has anyone had success with any of these items?
#22
EvoM Guru
iTrader: (1)
Originally Posted by Balrok
Damn neighbors. If you don't want noise don't move into a neighborhood by a track. If you don't want 5 kinds of cancer, don't move next to a xyz plant.
Also, 90dB is ridiculous. You literally couldn't take a lot of factory stock cars to that track day.
#27
EvoM Guru
iTrader: (1)
IIRC Sonoma is pretty hardcore and does have a guy with a sound meter going to random points on track.
Kaj,at what distance are you at 93dB? If that's at 10ft, it'll be much lower at 50ft.
Kaj,at what distance are you at 93dB? If that's at 10ft, it'll be much lower at 50ft.
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Bensant3 (Mar 1, 2020)
#28
I believe I googled the distance of the meter from the track at LS and placed the meter that distance from the side of the road. I then went by at WOT in 3rd gear. Definitely not a scientifically sound method, especially seeing that the mic at LS is actually aimed up the track, right at our exhaust.
Fun bit of trivia: ambient noise at the track with NO vehicles is already 53dB Also, in 2008, it was confirmed they had a roaming meter to catch people that would while passing the booth.
Sonoma seems to be 96dB, so I think I'll be okay there.
#29
Evolving Member
That's the exact one I was running. Never been flagged at Laguna, although I haven't run at Sonoma with that exhaust. Running a Tanabe Medallion now, much quieter.
#30
Evolving Member
How close are these guys getting to the track? The db level falls off pretty rapidly with distance, sound may only be a big issue with large straight-through exhaust systems.