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Old 01-28-2006, 03:38 PM   #126
Rizzo314
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Quote:
Originally Posted by tegnwrx
I'm not sure if it was stated but were all those readings of C-weighting?
Also does anyone happen to know what the standard is for measuring noise levels as far as limits for causing ear damage etc... do they measure in A-weighting or C-weighting?

Because the db levels of these exhausts is mostly due to Very low frequency levels...possibly lower then the average human ear can detect. switching to A weighting drops the DB's of my greddy by almost 20db.
Yea, but this also puts them all into proportion. Even if they were all off by 100db, they would ALL be off by 100db. They are all relative.
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Old 01-28-2006, 06:08 PM   #127
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I was just curious because i know OSHA states prolonged exposure to levels above 85 can cause hearing damage. I believe those values are for DBA (A-weighted)

I'm running the greddy evo1 and was taking measurements inside the car...cruising at 65mph i got readings of about 77 A-weighted and mid 90's C-weighted.....20db's is alot that's why i was just curious what the standard was for measuring nuisance noise levels in regard to determing harmful effects on hearing.

Specifically I was trying to determine whether the cabin noise was too loud for my newborn 77db I feel is ok (my g35x is 69db at 65mph), but that mid 90's c weighted is what I'm concerned about. Either way I'll be taking the baby in the g35 until she gets alittle older.

Last edited by tegnwrx; 01-28-2006 at 06:21 PM.
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Old 01-28-2006, 06:09 PM   #128
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You would have to PM Unabomber to find out the exact settings of his dB meter.

Rizzo, Unabomber will be back in Indy in March, will your new setup be ready to be tested?
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Old 01-28-2006, 06:27 PM   #129
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Originally Posted by dbrier
Rizzo, Unabomber will be back in Indy in March, will your new setup be ready to be tested?
If you loan me some cash.
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Old 01-29-2006, 06:30 AM   #130
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Get some cash buddy! Talked to the wife and I'm still a go for Indy on the 12th.

As to the schedule technobabble.... I have no clue. I have used the same testing methodology from day one and use my tests as a relative comparison only. In fact, I don't even think my meter does schedules, but I'm not sure. While I could set up the "perfect" test, it would be WAY too hard to do. Were talking using a $300 calibrated meter and a specific test site. With my $50 meter and any parking lot, it allows for the easiest and fastest testing.
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Old 01-29-2006, 09:33 AM   #131
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If things go as planned, I'll have a resonated Whisper (Whisper type R ) by the time you get here.
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Old 01-29-2006, 09:53 AM   #132
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Quote:
Originally Posted by Unabomber
Get some cash buddy! Talked to the wife and I'm still a go for Indy on the 12th.
It won't be done by then.

I'm going to run a GPMoto equal length header with up-pipe, with a custom down pipe, and a straight 3" catback dumping out of the bottom of the stock muffler. My guess is it will be about as loud as my old setup, but look stock.
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Old 02-06-2006, 04:07 PM   #133
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Default New WorxTuning Components Exhaust Db Levels

Unabomber- Since you aren't around to test for us, we went out and bought a nice digital db meter to test our new systems. The old design is gone as it was too loud for most as you saw when you were out in California.
So our objective was Full 3" with little to no restriction while maintaining reasonable sound levels. We went from a round canister to our new heavily packed oval canister design which proved to be very successful at dampening the rumbly boxer exhaust pulses. So what did we come up with?

Cat-Back only on 2002 WRX - 95 db at idle 102 db at 3k rpm
Full 3" catless Turbo-Back 2004 STi - 97 db at idle 105 db at 3k rpm

The cat-back can be found here: WorxTuning Components Cat-Back

For the Turbo-Back, we used our Catless Divorsed Wastegate Downpipe combined with the Cat-Back
We thought this would be the best combination of products to test as it gives a good range of sound output.

Mike
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Old 02-06-2006, 05:38 PM   #134
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Rich is going to make sure I have the new Whisper Type R by the time you get here.
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Old 04-01-2006, 11:24 AM   #135
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Thanks to Dale of MWIC fame, we now have results on the new Mad Daddy Whisper exhaust. I'm underway right now and cannot update my spreadsheet.

95dB at idle and 101dB at 3000 RPM

This puts the Whisper squarely into the quiet exhaust catagory and an option for those seeking quiet exausts.
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Old 04-01-2006, 11:47 AM   #136
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Quote:
Originally Posted by Unabomber
This puts the Whisper squarely into the quiet exhaust catagory and an option for those seeking quiet exausts.
And why would someone want to do that?

Oh, and my record holding RSR Exmag GT2 is for sale. I will even autograph it.
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Old 04-11-2006, 02:22 PM   #137
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I tried to get a louder reading than you Rizzo.
We tested a Stock WRX with only a Vishnu uppipe. Tested 6" from the downpipe with NO exhaust on the car, took the meter under the car.
107 at idle
112 at 3000 rpm
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Old 04-11-2006, 05:43 PM   #138
Rizzo314
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Quote:
Originally Posted by dbrier
I tried to get a louder reading than you Rizzo.
We tested a Stock WRX with only a Vishnu uppipe. Tested 6" from the downpipe with NO exhaust on the car, took the meter under the car.
107 at idle
112 at 3000 rpm
Weeeeee!!!!
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Old 04-11-2006, 07:59 PM   #139
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Quote:
Originally Posted by Unabomber
Throw a brother a bone here Jon! You are the .pdf/regulation Guru, hook a brother up if you know/can find the real info!

From my limited research, I would need a sound level meter complying with ANS S1.4-1971 (mine isn't and the real things run ~$300) and would have to comply with SAEJ1169 Testing Procedures:


And the Engine RPM must be held steady at 75% of rated peak horsepower RPM. Given the latter figure is 6,000 RPM for the US spec WRX/STI, the test speed is 4,500 RPM for these vehicles.

This is all too much of a pain for me to think of doing, so sorry California Scooby owners.
Damnit, I was just going to post this from APS!!!
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Old 05-14-2006, 07:37 PM   #140
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looking for quite full exhaust for 2000 legacy. i have no cats and borla headers, somthing duel tip, with resinators would probly be best cuz it is insane loud right now. went to 50's car show and sounded just like the 8cyl monsters running headers. need somthin thats mellow no rasp wanna be able to put the windows down and drive.
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Old 05-14-2006, 07:43 PM   #141
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dosnt even have to be that quite just not raspy or louder then it has to be for good flow new muffler might be better is stromung chambered?

usin this muffler now just got it mth ago probly sell it.
http://www.magnaflow.com/02product/s...ne=main&id=757
maybe that muffler is to much but then again people tie coffe cans on as mufflers any suggestions let me know searched high and low read all unibombers work just not much i can find for sale 2.25 that matches up with legacy well nothing that matchs up with legacy so will rs2.5 hangers all be in same spots stromung stuff looked good but no resonators for the $ sould have them and without cats kinda need them.

Last edited by Dweller; 05-14-2006 at 07:48 PM.
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Old 05-14-2006, 07:51 PM   #142
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How is the exhaust measured as I just got a dB tester
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Old 05-14-2006, 07:52 PM   #143
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read first page there is a pic and everthing
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Old 05-14-2006, 08:17 PM   #144
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I don't measure like the diagram though. I measure 6" from the tip as my meter isn't certified to do the high tech California testing and you have to have a specific facility to do so.
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Old 05-15-2006, 11:11 AM   #145
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Quote:
Originally Posted by Dweller
looking for quite full exhaust for 2000 legacy. i have no cats and borla headers, somthing duel tip, with resinators would probly be best cuz it is insane loud right now. went to 50's car show and sounded just like the 8cyl monsters running headers. need somthin thats mellow no rasp wanna be able to put the windows down and drive.
dweller,
I am running a borla header and no cats. the borla twin tip exhuast has a resonator and it is not raspy, just a nice mellow rumble. take a listen: http://media.putfile.com/borlaheader...ahushvf34_0001


Jim
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Old 05-15-2006, 02:09 PM   #146
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thanks i need a 2.25 exhaust though. think ur talking about the hush which has no N/A app
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Old 06-04-2006, 12:49 PM   #147
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I can't find the link to the exhuast sound clip and exhaust pictures installed. Can anyone post or pm me the links. Thanks
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Old 08-06-2006, 08:12 AM   #148
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is the site down? I can't access the files...
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Old 08-06-2006, 10:14 AM   #149
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Works fine for me, maybe it was a fluke with my server, give it another shot.
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Old 08-06-2006, 01:45 PM   #150
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cool... works now.. thanks.
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