Exhaust Decibel!?!?! - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 04-17-2007, 01:13 PM Thread Starter
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Exhaust Decibel!?!?!

Well I guess this is the most fitting place!

I helped my buddy install some nice subs in his car this weekend and I used our walmarts decibel meter to determine the decebile output of his new speakers, his brothers speaker, his brothers exhaust and my exhaust.

The new speakers (2 12" SPL's in custom fiberclass box) without tuning either of the 4000w amps hit 127.x dc. Mark later tuned Kyle's single 15" SPL up from 126.x to 131.x! We then measured Kyle's dodge Ram (318 aka 5.2 v8) at idle was around 90 dc and when revved maxed out at 117.x.
Now the good part! At idle, my trucks exhaust measured 117.x, and when revved with no load hit 128.x. The funny part is that from over 25 feet away while driving by I hit 115.x dc! Can you imagine what it would be if it was measured closer?

Point here is that my truck is as loud or louder then their bass!* LOL


*I bet there are MANY similar setups out there louder, but for in the driveway walmart decible reader style I was happy LOL.

2001 F250
11.62 @ 115.79
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post #2 of 5 Old 04-17-2007, 01:18 PM
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Originally Posted by Maintain View Post
Well I guess this is the most fitting place!

I helped my buddy install some nice subs in his car this weekend and I used our walmarts decibel meter to determine the decebile output of his new speakers, his brothers speaker, his brothers exhaust and my exhaust.

The new speakers (2 12" SPL's in custom fiberclass box) without tuning either of the 4000w amps hit 127.x dc. Mark later tuned Kyle's single 15" SPL up from 126.x to 131.x! We then measured Kyle's dodge Ram (318 aka 5.2 v8) at idle was around 90 dc and when revved maxed out at 117.x.
Now the good part! At idle, my trucks exhaust measured 117.x, and when revved with no load hit 128.x. The funny part is that from over 25 feet away while driving by I hit 115.x dc! Can you imagine what it would be if it was measured closer?

Point here is that my truck is as loud or louder then their bass!* LOL


*I bet there are MANY similar setups out there louder, but for in the driveway walmart decible reader style I was happy LOL.
u couldnt even race your truck in cali...at least on the dirt track....maximum decibal rating is 94....at 30 feet
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post #3 of 5 Old 04-17-2007, 01:31 PM
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haha that's stupid, love how nj doesn't have those rules!! i wonder what my truck would read with just the stacks/intake w/ stock downpipe and cat... and then what it'll be with the cat gutted and new downpipe!! and then once i start REALLY doin stuff!!! omg i can't wait!! haha
by the way what exhaust do you have?

1997 ford f350 crew cab extended bed powerstroke diesel

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post #4 of 5 Old 04-17-2007, 01:55 PM
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how accuate do you really think that db meter is? they arnt very accurate at all...

2007 Ford f250 rclb
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post #5 of 5 Old 04-17-2007, 01:56 PM
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That is sweet main! Makes me want to know how loud my ford is compared to my chevy gasser! it has true duals gutted cats and an X-pipe. 2.75" from the headers back. I wonder! i think my PSD would be a lil bit louder. 4" straight turned out in front of the rear tire.

2001 F-250 X-Cab 4X4, Edge EVO, DIY Tymar, Map Fooler, FPR Shimmed, 4" exhaust into 7" GR Bullhauler stacks, 3.5" fabtech lift,35x12.50 procomps, 18" DEJ cannon wheels, Custom built RobTrans, HD U-joints, Trip A-pillar Guages, 2 12" rockford subs 1500watt rockford amp and Eclipse head unit, More to come!
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