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The fact is one or more of the following:
A) GIAC does more than 2 extra pounds of boost
B) the car doesn't make the extra power and its all marketing
C) Its a crap tune - and just marketing
Has to be one or a combination of those facts. Its not a 500hp car with another 2 pounds of boost.
Unless you have actual proof of any of the above statements, you might not want to be so emphatic as you are potentially slandering GIAC.
GIAC (or a dealer) has posted dyno plots that show significant HP and TQ increases. The ET reported here also does suggest a significant power increase.
There are numerous ways in which this power increase could happen without huge increases in peak boost pressure. First, there is the A/F ratio. More power comes from a leaner mixture (until it is too lean at which point bad things happen). More power comes from more aggressive spark timing. Many modern cars have built-in torque limiting at low to mid-range RPMs to provide a more linear power delivery. The GIAC tune could and likely does alter all of these parameters and more. All of these can increase power significantly without huge increases in peak boost.
Even on NA cars, a good tune can often provide increases of 15-30 HP or more over stock at various RPM ranges by altering some of the above parameters. Combine that with even a modest increase in boost, and 50+ HP is easy to achieve.
I am impressed with the reported results and I hope that GIAC and other tuners continue their efforts as competition will provide more benefits for us owners and will likely push down prices.
You still haven't figured out in those three years reaction time has nothing to do with the elapsed time?
Frankly, I'd like to see the slip as I don't believe you. I don't believe that someone who ran a time you claimed would not know how a dragstrip's timing equipment works. I also don't believe the numbers you claim either.
Well I didn't really run that time myself, my launch control did, I didn't do anything. You're right I don't know anything about drag racing I did it once for fun. I think it's silly.
I would say the car is very close to 991.2 “Turbo” model performance with slightly less power(525hp-ish) but a few hundred pounds weight advantage. I should also mention I have a PDK equipped car. Way to go GIAC!
No. Just no. I keep hearing this, and I've seen some dyno plots, but the numbers say otherwise.
I have multiple 10.8@134 runs, a 10.6@136 run and a pile of 11.1@132 runs on a test-n-tune track with crap prep where I get wheelspin on every attempt. My car is bone-stock right down to OEM tire pressures and all the tools + manuals in the car. 10mph+ higher trap speed in the 1/4 mile is not even close in terms of power production. Because of the Turbo's power, it really needs something a lot stickier than stock street tires to get its power down, E.T. on slicks for a TTS is 10.2-10.4 absolutely stock otherwise.
All of that said, 11.2@122 is a really fast car. I had a 480hp, 3350lb race car that wasn't that fast in the late 90s.
Last edited by Steve Cole; 03-22-2018 at 12:44 PM.
oh forgot to add...the difference between the light blue line (Carrera S) and the green line (Carrera GTS) is 30HP (at the crank) - I'm sure most are aware of this.
Just got my GTS tuned today and WOW. I'm so glad I did it. The car feels way quicker and is even more fun. I got a Eurocharged tune, and they claim 80hp/90lbft tq. It definitely feels like it. Totally transformed the car.
Just got my GTS tuned today and WOW. I'm so glad I did it. The car feels way quicker and is even more fun. I got a Eurocharged tune, and they claim 80hp/90lbft tq. It definitely feels like it. Totally transformed the car.
Did they dyno your car - before tune and after tune? Where are you making your gains?
Did they dyno your car - before tune and after tune? Where are you making your gains?
They could have dynoed it if I wanted, but I didn't bother since I was in a rush to get it done. Also, I know the guys and trust them, and I have several friends that have their tunes and they have all been happy.
I only got it back today, but first impressions are great! It feels like I have more power everywhere. It pulls really hard even in 4th gear (PDK), and it definitely feels more like a turbo car now compared to the artificial linearity in the stock Porsche tune. I don't mean that in a bad way at all, I love the way it feels now. It just builds power so much more aggressively through the whole rev range, with zero driveability issues at all.
I'm taking it for a spirited drive this weekend to really push the car hard for a couple of hundred miles. When I did the same route last weekend I was wanting more power (hence why I got the tune this week), so it'll be interesting to see how it feels now.
They could have dynoed it if I wanted, but I didn't bother since I was in a rush to get it done. Also, I know the guys and trust them, and I have several friends that have their tunes and they have all been happy.
I only got it back today, but first impressions are great! It feels like I have more power everywhere. It pulls really hard even in 4th gear (PDK), and it definitely feels more like a turbo car now compared to the artificial linearity in the stock Porsche tune. I don't mean that in a bad way at all, I love the way it feels now. It just builds power so much more aggressively through the whole rev range, with zero driveability issues at all.
I'm taking it for a spirited drive this weekend to really push the car hard for a couple of hundred miles. When I did the same route last weekend I was wanting more power (hence why I got the tune this week), so it'll be interesting to see how it feels now.
05-16-2017, 08:11 PM
