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How does the pop and crackle of PSE work?

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Old 03-18-2016, 07:54 PM
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CSK 911 C4S
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Default How does the pop and crackle of PSE work?
I did a search and did not come up with any answers and the function of the exhaust intrigues me.

Econ mode w/PSE ON - fuller exhaust note w/o pop and crackle
Sport and Sport + w/ PSE ON fuller exhaust note with all the pop can crackle you can handle

So what makes the pop and crackle happen?

Fuel dump?

Exhaust valve remap allowing then to stay open longer?
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Old 03-18-2016, 07:57 PM
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DerekS
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I'm interested in knowing this too. I have a highly uneducated guess that the crackle is performed by a spinning part somewhere in the exhaust system.
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Old 03-18-2016, 08:02 PM
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No spinning part. That I know.
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Old 03-18-2016, 08:02 PM
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Fuel dump. If you google "porsche over run" you will find a few threads on it.
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Old 03-18-2016, 08:04 PM
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Old 03-18-2016, 08:57 PM
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Originally Posted by STG991
love it!
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Old 03-18-2016, 09:01 PM
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Yes, over fueling.
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Old 03-18-2016, 09:25 PM
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Originally Posted by STG991
Ha-ha!
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Old 03-18-2016, 09:39 PM
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Fuel dump? So PSE affects fuel economy?
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Old 03-18-2016, 10:12 PM
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Originally Posted by STG991
Lets hope we never hear anything snap..... but pop and crackle are always welcome.
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Old 03-18-2016, 10:16 PM
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I can never get enough of that lovely sound !!! And who really cares if it affects gas mileage. I could give a crap if the car only got 8 MPG
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Old 03-18-2016, 10:23 PM
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Originally Posted by Parnelli
I can never get enough of that lovely sound !!! And who really cares if it affects gas mileage. I could give a crap if the car only got 8 MPG
Ditto! My recent cars included and E90 M3, and E70 X5M, so this car is an upgrade in the fuel economy department. I need my crackle, and pop!
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Old 03-18-2016, 10:46 PM
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Originally Posted by DerekS
Fuel dump? So PSE affects fuel economy?
Non-PSE do it too.
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Old 03-18-2016, 10:52 PM
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Originally Posted by gbree
Non-PSE do it too.
So with that the snap and crackle is part of the sport and sport + programming I take it?
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Old 03-18-2016, 10:53 PM
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Originally Posted by gbree
Non-PSE do it too.
Yeah my non pse does it like crazy. I love the sound but seems a bit inefficient to me.
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