Sport & Sport+ have different boost
#46
Porsche is not delivering vehicles that don’t meet the published power specs in Normal mode. (Maybe this IS the next DieselGate, but I’m not betting on it.)
Boost as displayed on your MFD is not a direct measure of horsepower or torque. (Yes, the Service Adviser is not completely wrong.)
OF COURSE Sport, Sport+ and “Sport Response” modes are going to affect ‘displayed’ boost (along with a bunch of other drivetrain parameters.) Otherwise there could be no discernible difference between modes.
The question is if these ‘non-normal’ modes have some measurable non-trivial impact on peak torque or horse power.
If you want real data, then go get real data with an inertial dyno.
Glancing at you boost gauge is not data.
It’s like you looked out a window for 1/100th of a second, determined it was dark, and came to the conclusion that the sun had been destroyed.
It’s also not data unless you also record: engine and oil temperature, ambient temperature, humidity, barometric pressure, altitude above sea level, throttle position, and rpm (and probably several others that I’m forgetting about right now.)
Boost as displayed on your MFD is not a direct measure of horsepower or torque. (Yes, the Service Adviser is not completely wrong.)
OF COURSE Sport, Sport+ and “Sport Response” modes are going to affect ‘displayed’ boost (along with a bunch of other drivetrain parameters.) Otherwise there could be no discernible difference between modes.
The question is if these ‘non-normal’ modes have some measurable non-trivial impact on peak torque or horse power.
If you want real data, then go get real data with an inertial dyno.
Glancing at you boost gauge is not data.
It’s like you looked out a window for 1/100th of a second, determined it was dark, and came to the conclusion that the sun had been destroyed.
It’s also not data unless you also record: engine and oil temperature, ambient temperature, humidity, barometric pressure, altitude above sea level, throttle position, and rpm (and probably several others that I’m forgetting about right now.)
#47
So when Porsche claims 370 hp, that must mean for the base car with no options correct? So how much HP is my car really making in each mode?
Since hp is a peak measurement at a specific rpm, more boost across the rpm range will have no effect on the peak unless the increased boost is also present at the peak horsepower rpm. If boost drops to normal before this ‘peak rpm’ there’s no change in peak hp. (Capital-T Turbos have done this for years.)
Of course, there’s more horse power. Just not at the peak. So, it’s not ‘advertised.’
I’ve been wondering since the .2 intro with “Sport Response” mode why Porsche isn’t marketing “overboost” like they do in the Capital-T Turbos.
#48
Glancing at you boost gauge is not data.
It’s like you looked out a window for 1/100th of a second, determined it was dark, and came to the conclusion that the sun had been destroyed.
It’s also not data unless you also record: engine and oil temperature, ambient temperature, humidity, barometric pressure, altitude above sea level, throttle position, and rpm (and probably several others that I’m forgetting about right now.)
It’s like you looked out a window for 1/100th of a second, determined it was dark, and came to the conclusion that the sun had been destroyed.
It’s also not data unless you also record: engine and oil temperature, ambient temperature, humidity, barometric pressure, altitude above sea level, throttle position, and rpm (and probably several others that I’m forgetting about right now.)
I also agree that Porsche must be linking the 370 HP figure in the base engine in its base form of only normal/sport + mode. Therefore, there can only be two possible conclusions from my perspective:
1. The boost guage is not accurate or;
2. Cars with the SC package are making more HP than cars without this option.
I don't see any other conclusion.
#50
I’m away from home so can’t access my car to try it but if you bring up torque on the instrument cluster multifunction display, does it change the shape of the curve when you move from one mode to another?
#51
And to worf928's comments above from my observation, I observed the peak boost at about the same rpm in each run (around 6000 rpm).
So either we are making more HP in sport + mode or the boost gauge is not accurate.
#53
So either we are making more HP in sport + mode or the boost gauge is not accurate.
You agree that more boost provides more HP and Torque right?
Last edited by Ed911.2; 01-03-2018 at 01:27 PM.
#54
#55
Somewhere, probably working from home, Porsche Leipzig trainee Hans Schumann is working on Internet Marketing Module III: Forums, and calling out to his wife, Brun honey, more beer! The Rennderkind are at it again!
#56
Keep in mind the peak boost level is not going to be the same in all environments. Lately with overboost active my car (991.2 TT) has been peaking at 15 psi. In the hot parts of summer I saw 19 psi. What I mean here is the peak number doesn’t matter, the delta does. My assumption is the car is adjusting boost to always make rated power.
With a quick check on the freeway I verified my car makes more boost in S/S+ than in normal mode, sport and sport plus produce the same indicated boost level, and in a separate test the button matched S+. That matches my expectations and Porsche’s marketing literature about the car and the overboost feature.
For my car S+ is the only mode that activates the antilag so in idle cruising in S+ I will still have some boost pressure. S and S+ maintain boost through shifts, but the antilag feature is reserved for S+ mode - so I would conclude Porsche wants to keep something special reserved for S+.
Where in the RPM range is the boost increased? Is it effectively a torque increase in S+ mode with the same peak power? In my car peak boost is far down from redline. Peak power is around redline so the additional boost at moderate (3-4K) RPM levels increases peak torque and helps acceleration through the gears if you shift short but it has no impact on the rated/peak power since that is near the top of the RPM range and the turbocharger has run somewhat out of breath by that point.
With a quick check on the freeway I verified my car makes more boost in S/S+ than in normal mode, sport and sport plus produce the same indicated boost level, and in a separate test the button matched S+. That matches my expectations and Porsche’s marketing literature about the car and the overboost feature.
For my car S+ is the only mode that activates the antilag so in idle cruising in S+ I will still have some boost pressure. S and S+ maintain boost through shifts, but the antilag feature is reserved for S+ mode - so I would conclude Porsche wants to keep something special reserved for S+.
Where in the RPM range is the boost increased? Is it effectively a torque increase in S+ mode with the same peak power? In my car peak boost is far down from redline. Peak power is around redline so the additional boost at moderate (3-4K) RPM levels increases peak torque and helps acceleration through the gears if you shift short but it has no impact on the rated/peak power since that is near the top of the RPM range and the turbocharger has run somewhat out of breath by that point.
#57
#58
See this post for other insight on peak boost: https://rennlist.com/forums/991/9849...-pressure.html
There are owners reporting seeing the advertised peak boost without the sport chrono option on base c2.
I do not have the sport chrono option on my car and I'm only seeing 10 psi at peak and falling to 7-8 psi. I'm asking my dealership to confirm this next time I bring in my car.
There are owners reporting seeing the advertised peak boost without the sport chrono option on base c2.
I do not have the sport chrono option on my car and I'm only seeing 10 psi at peak and falling to 7-8 psi. I'm asking my dealership to confirm this next time I bring in my car.
#59
See this post for other insight on peak boost: https://rennlist.com/forums/991/9849...-pressure.html
There are owners reporting seeing the advertised peak boost without the sport chrono option on base c2.
I do not have the sport chrono option on my car and I'm only seeing 10 psi at peak and falling to 7-8 psi. I'm asking my dealership to confirm this next time I bring in my car.
There are owners reporting seeing the advertised peak boost without the sport chrono option on base c2.
I do not have the sport chrono option on my car and I'm only seeing 10 psi at peak and falling to 7-8 psi. I'm asking my dealership to confirm this next time I bring in my car.
Your 10 psi in your sport mode exactly matches mine. I can't get any higher (at least under the environmental conditions this morning) But I got up to 14 psi in sport + in the same car and same environment.
Maybe we have uncovered the secret power-kit for the base model. Sport Chrono in sport + mode. lol.