Cletus-Vette is 94 db at idle, 124 db at WOT

"cletus44 aka Clayton Seams" (cletus44) 08/07/2018 at 11:37 • Filed to: None

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Officially obnoxious. Got super nerdy and actually bought a decibel meter just to test this out. I always knew it was loud but 124 at WOT is just stupid. What does your car weigh in at? Anyone else ever tested theirs?

RamblinRover Luxury-Yacht > cletus44 aka Clayton Seams 08/07/2018 at 11:43

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Well, I haven’t, but I know there’s one here at work somewhere... Of course, that current information on janky stock single exhaust with leaks will be rendered irrelevant when I put on a dual exhaust with Porters.

cletus44 aka Clayton Seams > RamblinRover Luxury-Yacht 08/07/2018 at 11:46

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Porters?

crowmolly > cletus44 aka Clayton Seams 08/07/2018 at 11:47

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Eh, it’s good info to know due to noise ordinances and stuff. Some municipalities will pull you over and test your db level. I don’t think it’s really common but it does happen.

cletus44 aka Clayton Seams > crowmolly 08/07/2018 at 11:51

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Yeah that’s true. They implemented those rules in Calgary and it was mostly targeted at motorcycles. 

lone_liberal > cletus44 aka Clayton Seams 08/07/2018 at 11:52

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I’m not sure, the lack of any kind of crossover pipe probably brings it up a bit but I think my previous Camaro that had glasspacks wins in the obnoxious contest between the two. 

razorbeamteam > cletus44 aka Clayton Seams 08/07/2018 at 11:53

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I don’t know, but I know mine is LOUD. A few years back right before a winter road trip my resonanter rusted out and I had an independent muffler shop weld in a quick fix. I really should have asked what they had in mind before agreeing because they just slapped some glasspacks up there and sent it. My car screams over 3,000 RPM in the most annoying brappy way. Its an Audi 3.2 V6, so not the most particularly enjoyable engine note either. 

Phyrxes once again has a wagon! > cletus44 aka Clayton Seams 08/07/2018 at 11:53

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I always do this in my physics classes: check ambient values around school to show how much distance matters, then headphones, then if they behaved we will hit the parking lot for exhaust/car stereos.

If only EssExTee could be so grossly incandescent > cletus44 aka Clayton Seams 08/07/2018 at 11:54

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I think my accessory pulleys make more noise than my triple-silencered exhaust.

RamblinRover Luxury-Yacht > cletus44 aka Clayton Seams 08/07/2018 at 11:58

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It’s like if a glasspack was made by a soviet tank factory:

https://portermufflers.com/

Center coil spring instead of perforated tube, larger fiber chem resistant stainless packing, and a 16GA case, in either standard or stainless. Less tinny than a glasspack, quieter, and much longer lasting.

Urambo Tauro > cletus44 aka Clayton Seams 08/07/2018 at 12:00

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I still have the stock exhaust on my Mustang, and I don’t know how loud it is. But I came across this handy chart that lists dB and power comparisons between different brands and I’m saving it for later. Hopefully it’s not too outdated.

I like cars: Jim Spanfeller is one ugly motherfucker > cletus44 aka Clayton Seams 08/07/2018 at 12:01

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Aren’t sound dB usually measured at more than a foot away?

Also, when you averaged the numbers for each pipe, how did you do so? Decibels are a log scale, so you can’t just average them. If your measured values were x and y, you have to take 10^x + 10^y = z, then take log z to find the real average power.

TheD0k_2many toys 2little time > cletus44 aka Clayton Seams 08/07/2018 at 12:03

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Never checked but my RX7 is open headers under the car and my powerstroke is side exit with no mufflers at all

RamblinRover Luxury-Yacht > cletus44 aka Clayton Seams 08/07/2018 at 12:04

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Here’s what they sound like on a Galaxie with a 352 midblock.

Here’s with a 289 on a Falcon - so somewhere between this and that:

Die-Trying > cletus44 aka Clayton Seams 08/07/2018 at 12:05

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yeah, my truck had that....... the obnoxious. its cool at first. then you end up with neighbors somewhere up a main road that want to make a point of calling in noise complaints everytime you go for a drive. loud enough that you cant hear yourself yell inside the cab.

had small chamber heads, a HUGE cam in it, headers, and 3 inch exhaust with old glasspacks and tundowns about a foot behind the cab.

the neighbors complained that i rattled their windows as i drove past their house, a block away.

cletus44 aka Clayton Seams > RamblinRover Luxury-Yacht 08/07/2018 at 12:14

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Very cool! I like the sound

cletus44 aka Clayton Seams > Die-Trying 08/07/2018 at 12:16

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Is that the truck?  You could drive that thing by my house any do you like. 

cletus44 aka Clayton Seams > I like cars: Jim Spanfeller is one ugly motherfucker 08/07/2018 at 12:18

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Good points! We we’re trying to re-create the standard muffler noise test which is executed 12" from the ground and 12" from the tip. Measuring drive-by noise would happen farther away. And I guess we didn’t average it correctly either, I forgot it’s not a linear scale. 

cletus44 aka Clayton Seams > Urambo Tauro 08/07/2018 at 12:19

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Interesting how no muffler doesn’t always make the most power.

Die-Trying > cletus44 aka Clayton Seams 08/07/2018 at 12:29

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that was the truck...... gone but not forgotten......

she now awaits her rebuild.....

the sound out of the truck was simply amazing, eve ry once in a while it would crack one of the headers, usually next to a collector, and break off the exhaust. (stop pull over tie it up so it dont drag) it sounded like you were driving with a motorcycle in the cab with you.......

i’ll have to make a point to get it put back together a little sooner....

cletus44 aka Clayton Seams > Die-Trying 08/07/2018 at 12:31

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Yikes, that’s quite the impact! Must have sounded great. 

Die-Trying > cletus44 aka Clayton Seams 08/07/2018 at 12:40

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yeah, a kid pulled out in front of me at the last second, nowhere to go( you know how long it takes to stop an old truck) and i broadsided her car at approx 35 mph......

and the truck made such a glorious noise, truck 4 speed(compound 1st gear) and you could just wind it out about as far as you wanted to keep your foot in the gas. sounded amazing going up through the hills.....

parking lots are the best, chirping alarms, especially elevated parking garages. i used to go enter them JUST to drive to the top and set off as many alarms as i could, and then drive out.....such good times....... 

LOREM IPSUM > cletus44 aka Clayton Seams 08/07/2018 at 13:06

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I drove my e38 for a few days with open headers. Ridiculoud, especially when stopped at the light directly next to the Vancouver PD, under the Cambie street bridge. Might as well have been in a parkade, it reverberated so loudly. Didn’t matter how gently I tipped in, it ROARED.

Wife told me she wasn’t riding in it again until fixed, so back together it went, sans mufflers. Much more reasonable, but still let s em know.

BiTurbo228 - Dr Frankenstein of Spitfires > cletus44 aka Clayton Seams 08/07/2018 at 13:07

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124 is LOUD.

My loudest thing is the bike, but need to test it properly.

LOREM IPSUM > cletus44 aka Clayton Seams 08/07/2018 at 13:09

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Same in BC. Harley’s and sport compacts being the targets. V8's get a pass though, unless you’re going out of your way to make as much noise as possible.

I don't mind.