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CC Advertisers
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07-12-2010, 08:22 PM
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CC Member
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Join Date: May 2004
Location: centralia,
IL
Cobra Make, Engine: B&B cobra (sold), Hurricane HMS1002 (sold), Kirkham 289 FIA, (sold) RCR GT 40(sold) SPF GT40 2122(sold) Hurricane HMS2002, (sold) RCR SLC (sold) GTR on the way!
Posts: 1,288
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Not Ranked
What is a good DB sound level?
How loud is the typical cobra pipe? What about open pipes? Is 5 db's a noticeable difference?
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High Maintenance Racing Team
Run & Gun 2003 - 2013 
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07-12-2010, 10:23 PM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
Every 3 db is double the volume or if 3 db less then half the volume.
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07-13-2010, 05:12 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
I like about 15 db's 
__________________
Sunshine, Asphalt and no stop signs...Perfect
"Let's roll"
"Be part of Something Good
......Leave Something Good Behind!"
from CD "Long Road Out of Eden"
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07-13-2010, 06:14 AM
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CC Member
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Join Date: Dec 2001
Location: Castalia,
Oh
Cobra Make, Engine: EM cobra, 450 inch sbc running a best ET of 9.14..so far..ALL MOTOR...approx 800 horse.............ERA with 482 FE..All Aluminum Engine
Posts: 1,395
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Not Ranked
Quote:
Far spread is still the
theory of psycho-acoustic pioneer Stanley Smith Stevens, indicating that the doubling or halving the
sensation of loudness corresponds to a level difference of 10 dB
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That being said, my car at 30 feet at idle, was measured at 104 DB
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Jack
XSSIVE .....
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07-13-2010, 06:51 AM
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CC Member
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Join Date: Mar 2000
Location: Fairfield, NJ, USA,
NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
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Not Ranked
What???????????????????????????
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Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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07-13-2010, 07:30 AM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine: # 757 ERA 427 SC , 482 Al. big block
Posts: 896
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Not Ranked
I believe db levels are measured on a logarithmic scale ... which means things aren`t linear . Therefore as , as Greg , said , a small db change means a fairly significant in sound level .
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07-13-2010, 07:34 AM
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CC Member
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Join Date: May 2007
Location: Goshen,
ny
Cobra Make, Engine: Gary Edwards Racing 460
Posts: 444
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Not Ranked
Quote:
Originally Posted by Roscoe
What???????????????????????????
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Huh? You will have to say it in my right ear please.
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Its not the will to win that matters....Everyone has that. Its the will to prepare to win that matters.
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07-13-2010, 08:52 AM
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CC Member
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Join Date: May 2008
Location: Sacramento,Ca.,
Ca.
Cobra Make, Engine: Midstates (2001)
Posts: 1,724
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Not Ranked
when i was drag raceing they measured the db level at 50 feet.....
if you where over 96db at the start line at wide open throttle....
no raceing for you.....to loud and you went on the trailer....
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07-13-2010, 10:39 AM
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CC Member
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Join Date: Sep 2009
Location: Ft. Worth,
TX
Cobra Make, Engine: LSC427, 427DartSHP
Posts: 154
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Not Ranked
Yep, for example, going from 96db to 104dB makes that 104dB pressure level 12 times higher/louder than the 96dB pressure level.
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Sometimes things really do go as planned.
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07-13-2010, 11:49 AM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
I just kept raising the decibel level till my wife stopped trying to talk over them.
Just right now!
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Jim
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07-13-2010, 12:50 PM
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CC Member
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Join Date: Jul 2005
Location: Tulsa,
ok
Cobra Make, Engine: Lonestar, 427 Center Oiler
Posts: 352
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Not Ranked
You're getting old Dean. You don't want to choke your engine do you?
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07-13-2010, 02:04 PM
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Senior Club Cobra Member
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Join Date: Jul 2001
Location: Carrollton,
TX
Cobra Make, Engine: JBL now SOLD
Posts: 1,735
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Not Ranked
I cut off the standard mufflers and put on the Classic Chambered. Less restriction and less noise.....until you really hit it.
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6th generation Texan....
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07-13-2010, 02:35 PM
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Senior Club Cobra Member
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Join Date: Jun 2007
Location: Covington,
wa
Cobra Make, Engine: Superformance # 532, 466 BB, 560HP
Posts: 3,027
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Not Ranked
When your ears bleed,  go back to the prior setup. 
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John Hall
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07-13-2010, 05:56 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
80 db and you need, by law, hearing protection.
I think a lot of states require a car to be 80 db or less.
In the gun world, I hear that a 2 db reduction in sound, you heard half as much noise.
Dwight
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''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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07-13-2010, 08:43 PM
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CC Member
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Join Date: Dec 2006
Posts: 415
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Not Ranked
Jet engine = about 135+ db
AC/DC concert from 10th row = about 110 db
Cobra with straight pipes = ?
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07-13-2010, 08:54 PM
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CC Member
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Join Date: May 2004
Location: centralia,
IL
Cobra Make, Engine: B&B cobra (sold), Hurricane HMS1002 (sold), Kirkham 289 FIA, (sold) RCR GT 40(sold) SPF GT40 2122(sold) Hurricane HMS2002, (sold) RCR SLC (sold) GTR on the way!
Posts: 1,288
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Not Ranked
Here is the story behind the question. I didn't communicate clearly with the fabricator at Hurricane and as a favor to me he was willing to cut out the standard baffle and weld in the Classic Chamber system before it was all ceramic coated. He was half right. I have a beautiful set of ceramic coated side pipes with a 3.5 inch straight tube through the muffler. Yeah, thats right, wide a$$ open! I know it will be loud but how loud? It is only about 10.7 to 1 compression but still, wide open?
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High Maintenance Racing Team
Run & Gun 2003 - 2013
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07-14-2010, 06:31 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
I had Howe racing mufflers on my Cobra....which were basically straight through, big ID mufflers. They were 98dB mufflers. You couldn't talk to the passenger easily while cruising.
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07-14-2010, 06:48 AM
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CC Member
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Join Date: Dec 2001
Location: Castalia,
Oh
Cobra Make, Engine: EM cobra, 450 inch sbc running a best ET of 9.14..so far..ALL MOTOR...approx 800 horse.............ERA with 482 FE..All Aluminum Engine
Posts: 1,395
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Not Ranked
Quote:
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You couldn't talk to the passenger easily while cruising.
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That means you weren't going fast enough, the sound was still beside you, GO FASTER, put the sound behind you.
__________________
Jack
XSSIVE .....
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07-14-2010, 08:52 AM
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Senior Club Cobra Member
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Join Date: Jul 2001
Location: Carrollton,
TX
Cobra Make, Engine: JBL now SOLD
Posts: 1,735
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Not Ranked
Dean, it will basically be the same as the Howe muffler I would guess. Very loud. I had them on my CR and folks would put their hands over their ears when I passed them.
Best example is John Ross. You can hear him coming for miles...and you can hear him leaving for days!
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6th generation Texan....
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