GIAC software released for 991.2 S
05-18-2017, 01:45 PM
#106
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Sorry, but this is incorrect.
While altitude does have some impact on turbo performance, properly implemented turbos are designed specifically to avoid performance loss at higher altitudes. Turbos were first invented to allow piston engine airplanes to fly at higher altitudes when NA engines simply could not draw in enough oxygen to produce adequate power.
Thus, NA cars will show far more variation in runs in Denver vs. Atlanta than will turbo cars.
While altitude does have some impact on turbo performance, properly implemented turbos are designed specifically to avoid performance loss at higher altitudes. Turbos were first invented to allow piston engine airplanes to fly at higher altitudes when NA engines simply could not draw in enough oxygen to produce adequate power.
Thus, NA cars will show far more variation in runs in Denver vs. Atlanta than will turbo cars.
05-18-2017, 09:51 PM
#108
Burning Brakes
The magazines, at least the better ones, perform a weather correction to minimize the variation in performance due to atmospheric conditions. The correction is never perfect, but it removes the majority of the variability.
05-18-2017, 11:30 PM
#109
Rennlist Member
Yes! I am loving my 991.2 in Colorado. It may sound like a vacuum, but that's the sound of sucking extra air into the engine.
Around here, the fun roads start at 8000 ft, and top out at 12,000 ft. Your NA motor might sound better, but you are down 24 to 36% on horsepower compared to stated (sea level) specs.
Around here, the fun roads start at 8000 ft, and top out at 12,000 ft. Your NA motor might sound better, but you are down 24 to 36% on horsepower compared to stated (sea level) specs.
05-21-2017, 11:05 AM
#110
That's how the kids are nowadays man. The 3.0T may be dropping off by 6000 RPM while the GT3 motor is just getting started, but it doesn't even matter because they've all already lost interest and gone off to look for Pokemons. It's all about instant gratification, PDK transmissions you don't have to take the time to learn, motors that produce torque right away without having to explore the power curve. Porsche understands this and builds a car perfect for the impatient generation.
05-21-2017, 11:59 AM
#111
Dude Chill out. The 991.2 GTS is simply terrific regardless of what kind of engine is back there. Get in a drive one - .2 is superior in every way although there is nothing not to love about the 991.1 - super machine too. Your remarks above are not necessary and seem a little bitter. Have you actually driven a .2?
05-21-2017, 07:51 PM
#112
Take your car to the track and try to match the magazine time and you will see what I mean. People are always quick to say my car runs this or does that because they read it on a magazine. Not real, take your car to the track and see what it runs. Yes you are correct we can't compare different track because weather and elevation make a big difference but it's the only war to truly know how fast or quick your car is.
05-21-2017, 08:52 PM
#113
No just going by what I dyno'd it at and the comparisons I've done with cars on the street.
I'll take it to the track once tuned. Unfortunately, there aren't any good tracks in SoCal. I'll have to make the trip to Famoso which is a hell of a drive.
I'll take it to the track once tuned. Unfortunately, there aren't any good tracks in SoCal. I'll have to make the trip to Famoso which is a hell of a drive.
05-21-2017, 08:54 PM
#114
Based on what? Having far less torque and area under the curve?
Every naturally aspirated 991.1 I've run I have crushed. I don't know what you are basing higher trap speed on. Less power and torque? That makes sense.
Every naturally aspirated 991.1 I've run I have crushed. I don't know what you are basing higher trap speed on. Less power and torque? That makes sense.
05-21-2017, 08:56 PM
#115
I'd expect much higher traps for close to 100 extra bhp - that was one of my data points for questioning the tune. Maybe it gets off the line slower with a computer struggling to manage the newfound power.... but once the car gets rolling - trap speed is a big indicator of power. 991.1 C2S can trap 120 and a little change...
He is picking up over half a second from magazine times which are not even comparable as they are using GPS and not timing equipment which averages the trap speed.
Clearly the torque gain down low is huge. GIAC's dyno graph for the C2 confirms this. Do you just enjoy pulling things out of thin air?
05-22-2017, 01:31 PM
#117
How the hell is 122+ slow? He's on the verge of 10's. I don't think you understand the torque curve. Did you bother looking at a graph?
He is picking up over half a second from magazine times which are not even comparable as they are using GPS and not timing equipment which averages the trap speed.
Clearly the torque gain down low is huge. GIAC's dyno graph for the C2 confirms this. Do you just enjoy pulling things out of thin air?
He is picking up over half a second from magazine times which are not even comparable as they are using GPS and not timing equipment which averages the trap speed.
Clearly the torque gain down low is huge. GIAC's dyno graph for the C2 confirms this. Do you just enjoy pulling things out of thin air?
05-22-2017, 02:04 PM
#118
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How the hell is 122+ slow? He's on the verge of 10's. I don't think you understand the torque curve. Did you bother looking at a graph?
He is picking up over half a second from magazine times which are not even comparable as they are using GPS and not timing equipment which averages the trap speed.
Clearly the torque gain down low is huge. GIAC's dyno graph for the C2 confirms this. Do you just enjoy pulling things out of thin air?
He is picking up over half a second from magazine times which are not even comparable as they are using GPS and not timing equipment which averages the trap speed.
Clearly the torque gain down low is huge. GIAC's dyno graph for the C2 confirms this. Do you just enjoy pulling things out of thin air?
05-22-2017, 05:06 PM
#119
your 21's are definitely holding you back. I'm pretty confident with stock 20's you will break into the 10's.
