991.2 C2S Boost Pressure
04-11-2017, 07:23 PM
#1
Rennlist Member
Thread Starter
991.2 C2S Boost Pressure
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
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
Originally Posted by Car and Driver
We’re certain that the 420-hp Carrera S ($104,395) will break into the three-second range. Porsche claims zero-to-60-mph times for the Carrera S that are 0.2 second quicker than before in each configuration. The gap widens even more at higher speeds. In around-town blasts, the Carrera S is a missile. A two-millimeter-larger turbo impeller and tweaks to the engine-management software are the major differences between the Carrera and the Carrera S. To make the extra power, the S runs more boost: 16.0 psi to the Carrera’s 13.1. With so much in common, it’s not surprising that the S’s power is delivered with the same smooth linearity of the Carrera; there’s just a whole lot more of it. The tach needle swings even quicker as you pass 3000 rpm. The acceleration will flatten your hair against the headrest. Headrest head is now a thing. Bring a comb.
No one with a 991.2 looking at their boost gauge on the multi-function display?
04-12-2017, 04:54 PM
#4
Burning Brakes
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.
04-12-2017, 05:01 PM
#5
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.
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boxterjeff (05-06-2020)
04-12-2017, 05:09 PM
#6
Rennlist Member
Thread Starter
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.
04-12-2017, 05:21 PM
#7
Burning Brakes
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.
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.
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04-12-2017, 06:21 PM
#10
Rennlist Member
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.
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.
04-12-2017, 09:30 PM
#11
Burning Brakes
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.
04-12-2017, 09:47 PM
#12
Rennlist Member
Thread Starter
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.
04-12-2017, 09:53 PM
#13
Rennlist Member
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.
04-12-2017, 10:00 PM
#14
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.
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.
