How Loud (in DB) is PSE on a 991.
01-10-2019, 07:39 PM
#1
How Loud (in DB) is PSE on a 991.
Interesting article:
https://www.sema.org/sema-enews/2019/02/fact-vs-fiction-explaining-californias-new-exhaust-noise-law?utm_source=ET&utm_medium=email&utm_content=182081&utm_campaign=eNews 3.5&fbclid=IwAR2_9y2P36tZlxrsy-WTDnuDWV-kql3xghvPrBbIovXPje7-AutTuWRdC3Y
Some clarity also on Kalifornia legislation.
How loud is PSE? GT3 has to be louder than 95 db, no?
https://www.sema.org/sema-enews/2019/02/fact-vs-fiction-explaining-californias-new-exhaust-noise-law?utm_source=ET&utm_medium=email&utm_content=182081&utm_campaign=eNews 3.5&fbclid=IwAR2_9y2P36tZlxrsy-WTDnuDWV-kql3xghvPrBbIovXPje7-AutTuWRdC3Y
Some clarity also on Kalifornia legislation.
How loud is PSE? GT3 has to be louder than 95 db, no?
01-10-2019, 07:48 PM
#2
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.
01-10-2019, 08:25 PM
#3
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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?
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?
01-10-2019, 10:31 PM
#4
Rennlist Member
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.
01-11-2019, 01:26 PM
#5
Advanced
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.
01-11-2019, 01:30 PM
#6
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.
01-11-2019, 01:35 PM
#7
Advanced
Yes, different for cars vs. bikes
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.
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.
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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01-11-2019, 01:41 PM
#8
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Originally Posted by garfunkle
How loud is PSE? GT3 has to be louder than 95 db, no?
01-11-2019, 03:45 PM
#9
There no way a stock Carrera T is blowing 105 dB.
01-17-2019, 12:33 PM
#11
Rennlist Member
For clarification, SPL is not energy, it is a dimensionless ratio of amplitudes, so 20 Log or every 6 db the amplitude doubles. Perceived loudness doubles every ~10 db. 4 db change in SPL is a 158% increase, while perceived loudness increases 32.5%.
