Thanks much for the pictures. I have the same color car by the way. I love it!

 

First time I've heard that PSE improves the torque curve...did this info come from porsche? If not, can anyone confirm this from another source?

 

Anyone have pic of hp/torque curve with and without PSE - preferably on a 3.8 engine

 

Porsche booklet setting forth differences between 997 and. 991 makes that claim. The improvement - if any - Is marginal. It's not a GTR. If you want a torque monster you've bought the wrong car. N

 

The main component of the PSE is the center muffler swap. If u don't install the button and valve actuator system to turn the pse on and off, then the valves on the pse stays naturally open, meaning you will have the original factory porsche pse in loud mode at all times. Without bothering to install the button this is definitely DIY doable and bonus if u can buy the pse center for cheap. Good luck and let us know how it goes!

 

For the pse to stay on all the time ie.loud mode, just disconnect and block the small air hoses going to the valves on the pse center muffler. This leaves the valves naturally open which bypasses some of the exhaust gas that were supposed to go to the side mufflers for direct exit out back to the Centre tailpipes thus creating a louder exhaust sound.

 

Who said anything about wanting a torque monster???

 

Well who doesn't want one?

 

wrong car for you then :-)

 

350 ponies are plenty for me.

 

Cracks me up, all the debates on how the Base and S are so terrible torque wise..

Then I compare the torque curves to older muscle cars I had when I was young.. Ford and Chevy small blocks that were in the 300HP range stock (actually my 69 351W ford was 290HP and 380 ftlbs torque.. These weren't big blocks but they had a lot of torque, and were more than enough to get us into trouble.. And when I look at the numbers there and compare to my S with 400HP and listen to the nonsense about how this engine is under performing..

To be fair, the torque and HP are applied at a higher RPM in a porsche engine.. It's just sort of the nature of less cylinders and lower displacement producing higher horsepower.. To do the same work gotta run at higher revs.. But somehow this undertorqued engine can get to sub 4 second 0-60, where my mustang couldn't..

I've just come to the conclusion that people don't really know how to compare a car with higher rev'ing engine to a lower reving V8 which produces it's HP and torque at lower RPMs. So they perceive it as less power and torque when it really isn't..

My old ford was never as smooth in a WOT 0-60 either, so I suspect the leads to a more subdued feeling..

Thing is when I was choosing S vs Base, I foolishly listened to "expert" people on the forums and ultimately picked the S because they worried me..

I'm pretty sure I would have been just fine with a base performance wise..

 

Think of hp as torque at high rpm. HP tells you nothing about toque at low rpm, and thus nothing about the feel of the car in normal driving. So when you compare old school school high displacement cars which had a lot of torque at low rpm, they may feel mor fun to drive in normal situation than smaller displacement modern cars that make less torque but are able to maintain that torque at higher rpm. And vice versa

 

A 991 Carrera is just about as fast around a track as a 997S and both go way faster that anyone needs to go on the street. Its just a bit more so in a 991S.

 

Amen. My Base was great from the beginning and as it approached 20k miles it seemed to get more powerful as if the engine was fully broken in.

Torque? 6.7 L Powerstroke. Need I say any more?

 

Can anyone confirm if the PSE, without vacuum, is it in valve closed (normal mode) or valve open (loud mode) ?

I am retrofitting PSE to my 991.1 base Carrera.