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How Loud (in DB) is PSE on a 991.

Old 01-10-2019, 08:39 PM
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garfunkle
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Default How Loud (in DB) is PSE on a 991.

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Old 01-10-2019, 08:48 PM
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You have NOTHING to worry about with a fully stock vehicle. If CA has an issue with a stock exhaust, they need to do something about it, not you. Besides, you can just put it in quiet mode and it wouldn't be over that. As far as a stock GT3, it's not that loud, but don't know what's its dB rating. Remember it depends where you measure it. Most GT3 owners I know removed the center muffler to make it louder but not overly so. They sound like a 981 Cayman S with PSE (or a GTS) with that mod IMO, so they're actually tamer stock, which was surprising to me.
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Old 01-10-2019, 09:25 PM
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Bob Z.
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Originally Posted by garfunkle View Post
Interesting article:
https://www.sema.org/sema-enews/2019...e7-AutTuWRdC3Y

Some clarity also on Kalifornia legislation.

How loud is PSE? GT3 has to be louder than 95 db, no?
If it matters it is 50 state legal in regards to noise restrictions.
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Old 01-10-2019, 11:31 PM
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In my T the stock pse overrun (burbles) is 105 dB in sport mode. Akrapovic is 109 (so more than twice the amount of sound energy but ~30% increase in perceived loudness). Sport + is 105. I doubt the 991.1 is quieter. Would have to see it to believe it.
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Old 01-11-2019, 02:26 PM
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Keep in mind that the measurement of 95 dBA is at 1/2 meter from the exhaust tip and at a 45 degree angle to the flow of the exhaust. There are several other requirements for the test such as height off the ground, no sound absorbing materials in the area, etc.
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Old 01-11-2019, 02:30 PM
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Originally Posted by DvD5 View Post
Keep in mind that the measurement of 95 dBA is at 1/2 meter from the exhaust tip and at a 45 degree angle to the flow of the exhaust. There are several other requirements for the test such as height off the ground, no sound absorbing materials in the area, etc.
The last time I read the moto test for CA, it was 50 feet at 3,000 rpm. Is it different for cars?

Either way, those sound tests are not typically done at WFO, so I'm sure PSE would not be engaged at the test rpm. If it was, the car would not have been California compliant for sale in CA.
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Old 01-11-2019, 02:35 PM
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Originally Posted by Archimedes View Post
The last time I read the moto test for CA, it was 50 feet at 3,000 rpm. Is it different for cars?

Either way, those sound tests are not typically done at WFO, so I'm sure PSE would not be engaged at the test rpm. If it was, the car would not have been California compliant for sale in CA.
Yes, the test procedure is different for cars and bikes. The Harley lobby must be strong :-)

It's not clear to me that PSE will fail the test. Anyone have the numbers? I'm curious since I don't have PSE and I'm considering x pipes (keeping the stock cats).
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Old 01-11-2019, 02:41 PM
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LexVan
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Originally Posted by garfunkle

How loud is PSE? GT3 has to be louder than 95 db, no?
GT3s pass the 95 db restriction at race tracks all around America.
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Old 01-11-2019, 04:45 PM
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Originally Posted by Rennolazine View Post
In my T the stock pse overrun (burbles) is 105 dB in sport mode. Akrapovic is 109 (so more than twice the amount of sound energy but ~30% increase in perceived loudness). Sport + is 105. I doubt the 991.1 is quieter. Would have to see it to believe it.
There no way a stock Carrera T is blowing 105 dB.
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Old 01-12-2019, 11:43 AM
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Laguna Seca sound requirement was 92 dB when I ran last year. My 991.2 CS with PSE passed, my friends 991.1 GT3 got a black flag every time.
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