Hey guys,

So I am enjoying my new 17 C2S 7MT, but I couldn't help notice I am only seeing 12PSI max on the boost gauge and I read on the internet that the 2S should be getting ~16PSI. I tried both sport mode / regular mode - yet neither will seem to get it over 12PSI. Obviously 4PSI of boost pressure would account for a lot of power so this is important. I read the owners manual cover to cover and could not find ANYTHING about how much boost pressure this car should be running. Any help or feedback from other owners is welcome.

According to Car and Driver.. see below...

Carrera 13.1 PSI
Carrera S 16.0 PSI

 

No one with a 991.2 looking at their boost gauge on the multi-function display?

 

Mine I think no higher than 13 ? But it's a base.

 

With the sport chrono there is the little button in the middle of the mode selector dial on the steering wheel which is supposed to give max boost, so one of these days I will push it and see what the boost is. Have done it in the past but am watching where I am, very quickly, going.

 

I have a base 991.2 cab and the only time I was able to see max boost pressure of 13 PSI was at the track under full throttle acceleration.... conditions that are rarely achievable on public roads.

 

Hmm.. it would really upset me if 16PSI is only accessible with sport chrono option (I do not have this option) ... I will wait till my first break-in service to really do some digging at the dealer but before I do that I wanted to see what the forum thinks.

 

I have a base 991.2 and it achieves the promised 13 psi in the mid-range. I think the boost tails off at higher revs.

I would recommend that you find a reasonably empty and straight road, put it in third gear at around 2000 rpm, floor the throttle and keep it on the floor up to the redline (roughly 28-105 mph).

I suspect that you will see your 16 psi in the 3000-5000 rpm range.

 

^ this exactly... the challenge is finding an empty road to try this on...

 

No problem in Colorado. You can always go out to an interstate around 3:00 AM. That should even work in Los Angeles.

 

The sport response button is only available with pdk. He has a 7MT. I agree this is the difference in boost from the claimed numbers in the article that he is observing though. Sport response button adds boost. Need pdk + SC for that.

 

Not so. My base 991.2 is also a manual without sport chrono and I see the rated 13 psi boost.

He should be seeing 16 psi without sport chrono. After all he has a S rated at 420 hp. You don't have to have sport chrono to see all of your rated power.

 

I spent some more time with the car at WOT... 2nd gear I have seen 15 PSI at WOT at ~5500+ RPM , same with 3rd. So I guess everything might be working as it should... that said, every other turbo car I have had boosts to max pressure as soon as you roll on the throttle - maybe this car is different with all thew new technology.

 

I don't think you are correct on this point. (this is true on the .1 in which SC provides additional throttle mapping and ECU changes) But on the .2, the PDK with SC provides the sport response button. This absolutely provides additional power. Isn't this accomplished by additional boost as I have read in the auto rags? How else are they developing more power for 20 secs.


I am open to being corrected on this point.

 

They aren't developing more power for 20 seconds.
If you were in all less aggressive settings, the sport response button just maxes the available settings. It's possible that sport + shifts quicker, but as far as POWER......no difference between Sport chrono and NON sport chrono.

As far as performance, sport chrono doesn't do as much as you think. But Porsche doesn't exactly tell you that. They want to sell you a $2600 stop watch/clock with a fancy circular dial with a button coming out of the wheel. Looks cool though.

 

What kind of gas are you using? I wouldn't be surprised if California drivers were getting less than the rated boost due to the junky 91 octane here.