Sport & Sport+ have different boost
#16
I assume/d it's simply a "Temporary Sport Plus" so when I had a 718 S for a while, I just flipped the **** to S+ when I needed the boost (instead of using the push "boost" button). But then I heard that the button actually provides a MORE aggressive mapping than Sport+? Not sure if it was just marketing verbiage, but I'm curious of the same thing.
#17
On the TT I know overboost is disabled in normal mode. The color of the boost indication goes orange when overboost is active. Now I’m curious to try S, S+, and the button all at once...
If you want a rough estimate of the power due to additional boost, with 420 bhp at 16 psi, taking atmospheric pressure at 14.5 psi gives a total pressure of 14.5+16=30.5psi. 420hp/30.5psi gives 13.8bhp per psi. Using that estimate, 2 psi means about 28bhp.
If you want a rough estimate of the power due to additional boost, with 420 bhp at 16 psi, taking atmospheric pressure at 14.5 psi gives a total pressure of 14.5+16=30.5psi. 420hp/30.5psi gives 13.8bhp per psi. Using that estimate, 2 psi means about 28bhp.
#18
On the TT I know overboost is disabled in normal mode. The color of the boost indication goes orange when overboost is active. Now I’m curious to try S, S+, and the button all at once...
If you want a rough estimate of the power due to additional boost, with 420 bhp at 16 psi, taking atmospheric pressure at 14.5 psi gives a total pressure of 14.5+16=30.5psi. 420hp/30.5psi gives 13.8bhp per psi. Using that estimate, 2 psi means about 28bhp.
If you want a rough estimate of the power due to additional boost, with 420 bhp at 16 psi, taking atmospheric pressure at 14.5 psi gives a total pressure of 14.5+16=30.5psi. 420hp/30.5psi gives 13.8bhp per psi. Using that estimate, 2 psi means about 28bhp.
#19
Of course you are assuming a linear relationship between boost and HP. Maybe there is.
#21
on the contrary, if you don't have Sport Chrono, you wouldn't have all these different Sport modes, and while your throttle mapping etc will always remain same, I would assume you would also always have access to the full HP available for the particular 991.2 911 you own. but thats my guess. if you buy a 420 HP Carrera S, Sport Chrono or no, you should have 420 HP available. I think Sport Chrono is the one actually missing out on HP on some of its modes.
#23
#24
I’m glad to see I’m not the only crazy one experiencing this. FYI My experience is in order to consistently get max boost in each mode is to do launch control. I suggest everyone go out and try for yourselves.
Seeing this has me really considering an aftermarket ECU upgrade after my warranty ends. Clearly these cars are tuned down. A smart shop can probably max out the existing boost levels accross the rev range to gain significant power without even stressing the motor with just max boost increase. Someone should ask Nick to check how the boost increase changes accross the rev range on the GIAC ECU upgrade he tested.
Seeing this has me really considering an aftermarket ECU upgrade after my warranty ends. Clearly these cars are tuned down. A smart shop can probably max out the existing boost levels accross the rev range to gain significant power without even stressing the motor with just max boost increase. Someone should ask Nick to check how the boost increase changes accross the rev range on the GIAC ECU upgrade he tested.
https://rennlist.com/forums/991/1033...the-motor.html
#25
I really am curious how you guys do your real time testing. The only way to make sure what maximum boost the car is making in the different driving modes, is to put some load on it for a decent amount of time. Typically the lower gears are to short to do that. So that means you will have to be in a higher gear like third/fourth gear and above. What kind of speeds are you doing by then? Anyone tested this on the autobahn?
#26
A few months ago you posted a thread asking how to "de-tune" your GTS, now you're complaining that it might be de-tuned?
https://rennlist.com/forums/991/1033...the-motor.html
https://rennlist.com/forums/991/1033...the-motor.html
this is two completely different issues. if you buy a 200K+ car and don't even know exactly what power you are pushing i think that is an issue.
You don't mind that your car has different HP levels at different modes without you knowing the full details??
#27
I really am curious how you guys do your real time testing. The only way to make sure what maximum boost the car is making in the different driving modes, is to put some load on it for a decent amount of time. Typically the lower gears are to short to do that. So that means you will have to be in a higher gear like third/fourth gear and above. What kind of speeds are you doing by then? Anyone tested this on the autobahn?
but from my experience so far, it was hard for me to get to full 18 psi from just flooring the car even on Sport + mode, going through the ranges of 2nd 3rd 4th on the freeway floored. I could only get consistent 18 psi if i did launch control.
#28
Delivery date for my car is not until February/March. And I still have to run it in.
After that I will be more then happy to try some autobahn runs in the higher gears, because I think that will give more reliable data on boost levels.
Although I am still not buying into the detuned scenario.
After that I will be more then happy to try some autobahn runs in the higher gears, because I think that will give more reliable data on boost levels.
Although I am still not buying into the detuned scenario.
#29
Delivery date for my car is not until February/March. And I still have to run it in.
After that I will be more then happy to try some autobahn runs in the higher gears, because I think that will give more reliable data on boost levels.
Although I am still not buying into the detuned scenario.
After that I will be more then happy to try some autobahn runs in the higher gears, because I think that will give more reliable data on boost levels.
Although I am still not buying into the detuned scenario.
#30
Boostgate.
How do you think Porsche produces an engine with an absolutely-flat torque curve from 1,XXX rpm to 5,XXX rpm?
By managing the boost level across the rpm range. A “purely mechanical” engine of any sort never, ever, ever has a flat curve.
There’s no fraud or deception here. Porsche didn’t sell you a torque curve or a constant boost level. They sold you a peak torque and a peak (flywheel) horse power number. You’re all hitting, at least, those numbers.
How do you think Porsche produces an engine with an absolutely-flat torque curve from 1,XXX rpm to 5,XXX rpm?
By managing the boost level across the rpm range. A “purely mechanical” engine of any sort never, ever, ever has a flat curve.
There’s no fraud or deception here. Porsche didn’t sell you a torque curve or a constant boost level. They sold you a peak torque and a peak (flywheel) horse power number. You’re all hitting, at least, those numbers.