How does sound symposer behave?
Race Car
Joined: Jun 2012
Posts: 3,628
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From: Maryland USA
Assuming you are asking about a 991.1, and you are referring to the changeover valve that controls what Porsche calls the "symposer" that allows more air intake sound from the engine into the cockpit, I believe that when you select Sport or Sport + mode the vacuum opens the valve. The intake sound is not simulated. There are engine and motor sound simulator systems providing tailored sounds in ICE and EV cars, but the "symposer" is not one.
Last edited by chuckbdc; May 20, 2023 at 09:55 AM.
Thread Starter
Burning Brakes
Joined: Nov 2019
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From: NoVA
Yes the "symposer" is what I meant. I edited my post to reflect that. I was meaning to ask what conditions cause it to be opened/closed? Does it depend on engine speed and load to variably open/close, or it just open when you select sport/+ modes?
Thread Starter
Burning Brakes
Joined: Nov 2019
Posts: 1,062
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From: NoVA
Burning Brakes
Joined: Dec 2021
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Apologies, Im confusing 991 and 981. For 991.1 Porsche says:
"Sound symposers
In addition to the new exhaust systems, two sound symposers provide for a particularly emotional sound in the passenger compartment. They transfer the load-dependent pressure differences upstream of the throttle valve to a diaphragm causing this to vibrate and transmit the engine sound directly into the passenger compartment. In normal mode, one sound symposer opens above an engine speed of 1,800 rpm.
In SPORT or SPORT PLUS mode, the second sound symposer is additionally activated at all engine speeds. During deceleration, the first sound symposer is always closed and the second is closed between 3,500 and 1,800 rpm."
"Sound symposers
In addition to the new exhaust systems, two sound symposers provide for a particularly emotional sound in the passenger compartment. They transfer the load-dependent pressure differences upstream of the throttle valve to a diaphragm causing this to vibrate and transmit the engine sound directly into the passenger compartment. In normal mode, one sound symposer opens above an engine speed of 1,800 rpm.
In SPORT or SPORT PLUS mode, the second sound symposer is additionally activated at all engine speeds. During deceleration, the first sound symposer is always closed and the second is closed between 3,500 and 1,800 rpm."
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Joined: Jul 2003
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Just takes a few minutes
I have not gotten around to it yet. With sport plus off the car is pretty quite.
https://www.google.com/url?sa=t&sour...cqvdNABdyJR3Vq
https://www.google.com/url?sa=t&sour...cqvdNABdyJR3Vq
Burning Brakes
Joined: Dec 2021
Posts: 904
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I have not gotten around to it yet. With sport plus off the car is pretty quite.
https://www.google.com/url?sa=t&sour...cqvdNABdyJR3Vq
https://www.google.com/url?sa=t&sour...cqvdNABdyJR3Vq
Drifting
Joined: Aug 2017
Posts: 2,572
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Sound Symposor delete thread
Found the thread on how to delete. It will show you a lot about what it actually is.
Found the thread on how to delete. It will show you a lot about what it actually is.
Rennlist Member
Joined: May 2023
Posts: 160
Likes: 31
From: Central TX
Is the 991.1 the same?
I always deleted the sound tubes from other cars I had, and was wondering if Porsche did the same thing.
Sorry, did a search and found what I was looking for!
I always deleted the sound tubes from other cars I had, and was wondering if Porsche did the same thing.
Sorry, did a search and found what I was looking for!
Last edited by The Roon; Aug 6, 2023 at 08:56 PM.