COBB Tuning

Same boost level as we use in the OTS tune. Just more power due to the larger turbocharger.

-Mitch

Rennolazine

Have you tested vehicles with the 7speed manual transmission?

LavaGTS

Why aren't you guys sharing actual numbers/data instead of these generic vague replies?

On other platforms and forums there's almost an infinite amount of numbers and data shared but in the Porsche world everything is hush hush.

3DMetal

They posted the dyno graph, and the boost pressure it ran at.

its 480 wtq, and 600 whp. If you went to the 560 wtq, and held to redline ( where the GTS peaks and falls from ) these turbochargers have much more potential in them with this platform.

Valvefloat991

Perhaps I missed it or couldn't read it. What was that boost pressure?

groundhog

Cobb - straight and simple request - please post the AFR and boost profiles for these runs . This has been requested several times by forum members. If you can't provide these numbers please provide an explanation as to why you can't.

I would also suggest you verify your numbers on a quality dynometer e.g. Maha, which are known for their accuracy and reproducibility. I am sure there are several groups in Germany that would help you with this and ensure appropriate corrections are made - an area that has been problematical for Porsche turbo charged sports cars when assessing real gains and accurate baselines.

I have no doubt you have made good gains - however, the peak gain numbers you are quoting for the base, S and GTS are very optimistic. From your perspective, and I'm sure you are aware of this, there are more than a few forum members that are involved in, and have historically been involved, all sorts of race programs and as such are well informed. From my perspective I can't assess the quality of your offering without basic information such as AFR and boost profiles.

COBB Tuning

I have tuned on Maha's before and saying that it is the end all be all of dyno's is simply biased. Ask any dyno shop owner, their dyno is the best. I will say I all dynos are different and they all have pluses and minuses.

As for lambda and boost numbers we are not hiding anything, that is why the AP has datalogging you can see the values for yourself. Regardless we target around 21psi for the Carreras and .82 lambda. In the 991.2/718 they are a lot more torque based in terms of boost control so really the boost target number is more influenced by the torque control system, so saying how much boost a car is running is more influenced by the torque control strategy and an change based on many factors and variables-- intake temp, coolant temp altitude etc.

In the 991.2 there are some other fun things that happen in that need to be taken into account when tuning as it is something new in Porsche control systems. If not done in tuning it could result in cars having running issues over time. The other problem is without being able to do custom logging you don't even know it is happening as it is a stored variable that is getting set over time and it has a huge effect on the ignition timing, boost and engine health.

I hope this helps some. If you have questions please keep them coming.

-Mitch

85Gold

COBB Tuning

Here is a snap shot of a 991.2 Turbo that I grabbed quick. Dont want you guys going all conspiracy theory on us

We have lots of data. If you want a tech write up of the ecu and what we change we are happy to do so. We are very clear and are always happy to share data so just let us know.

Thanks guys!

-Mitch

n8kruger

Mitch
With there be any use to keeping our accessport equipment when moving from .1 to .2 Or would we need new hardware?

arter

could you show the same graph for a 991.2 carrera GTS?

COBB Tuning

Ask and you shall receive. GTS Targa 4 bone stock with a flash on 91 octane.

arter

So max boost about 22.4 psi on 91 octane for a GTS. okay, I can live with that.

My graph psi boost vs estimated crank hp (prior to seeing your data).

groundhog

The GTS without tune runs up to 22PSI on 93AKI. Although the modal value above 4000RPM is 18PSI - which is the number released by Porsche. Typically the boost in my GTS tapers from 6000/6500 rpm to 7500. In effect it looks like the tune would shift the modal value by 1 to 2 PSI in real world track driving so a real gain of around 50 to 60 HP at the crank (achieved by eating into the taper and with a modest increase in boost). So around 430 at the wheels.

No one said they are the be all and end all - however, they have a very strong reputation for accuracy and reproducibility - both of which are good to know and good to have. Some of us like meaningful numbers .

The good news for most is, with a tune they can skip the 992.1 series - perhaps someone got one up on Porsche for a change

PS . I am 100% sure that I read a technical article that stated the pistons in the base model were different to those in the S and GTS - this may have some implications for robustness.

arter

So using your MAHA derived loss factor ( 370/450) 430 RW turns into 523 HP at the crank.