The vacuum closes the valves (makes it quieter) AFAIK, mine barks on start up and quietens as soon as vacuum builds (997 though, I'd have thought 996 the same) _________________ 997 C4S Tip-S, 2007, Silver/Red Leather, PSE, Sports Chrono, Turbo wheels.
bakerboy4s Monza
Joined: 06 Jun 2015 Posts: 156 Location: Staffordshire
Posted: Mon Jun 19, 2017 9:43 pm Post subject:
Default is valves open, louder, switch pse off button illuminates and exhaust is quiet.
There is a reduction in exhaust note between about 2000 & 3000 rpm then it kicks in again, I understand it's to do with noise abatement in US.
PeterS Fuji
Joined: 01 Nov 2009 Posts: 9169 Location: Solihull
The vacuum closes the valves (makes it quieter) AFAIK, mine barks on start up and quietens as soon as vacuum builds (997 though, I'd have thought 996 the same)
No, the 996 is reverse.
(Don't ask me why, EU noise emissions I would imagine) _________________
All times are GMT - 12 Hours
Page 1 of 1
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You can attach files in this forum You can download files in this forum You cannot post calendar events in this forum
![Porsche 911 [991]](./images/models/998.png)
![Porsche 911 [997]](./images/models/Model-997.gif)
![Porsche 911 [GT]](./images/models/Model-GT.png)
![Porsche 911 [996]](./images/models/Model-996.gif)
![Porsche 911 [993]](./images/models/Model-993.gif)
![Porsche 911 [RS]](./images/models/Model-RS.gif)
![Porsche 911 [964]](./images/models/Model-964.gif)
![Porsche 911 [Early]](./images/models/Model-Early.gif)
