Pokerhobo

Ordered!

RoadrunnerGTS

Unlikely. I'd expect all tuners (Softronic, ME, Cobb) to be around the same. Some just post more conservative charts

Call me a sceptic, but really doubt 60+ HP on a GTS. Happy to be proven wrong.

BGB Motorsports

Competition breeds improvement! It will make you a better driver BUT it is also my duty to keep the Unfair Advantages to a minimum!

The car is very good at handling additional increases in air flow. It can adapt nicely to revisions to the exhaust. If you start dumping filters though, while the flow will increase if you go so far as to trigger a CEL, then the map will revert to something with a fatter mixture.

I'm always skeptical about every single thing that's printed for the purposes of selling. I've been at this for two decades and remember a time when 7rwhp on a 987.1 was a big deal. I'm old school so if you give me 15rwhp from a tune on an NA car and almost 80rwhp on a tune for a turbo car OVER WHAT PORSCHE DOES and i'm stoked. This car woke up a lot from the tuning. I stropped paying attention though after the 20rwhp number cuz i saw all i needed to.

If i was doing the marketing offering i would absolutely choose the comparison to the model that Porsche restricted vs. the best run of the one that didn't for obvious reasons! I would go and find the poopiest spot on the curve for the stock car and then go and find the best part of the curve for the tuned GT4 with the most jam and that's the number i would use IF i didn't believe in underquoting every single thing i sell so i can impress not disappoint...

Awesome! I got it. We have a new additional sales associate by the name of Doug that is here to assist AJ!

Santa doesn't even have to put it in his sack when he comes down the chimney, Fedex or UPS handle that! Just bring it to his workshop to put it on the Dynojet!

RoadrunnerGTS

Fair enough and good response.

Cobb is +8% HP+ over Softronic and +10% HP over M-Engineering (Stg 1 93). That's a fair amount for those other tuners to be leaving on the table, so Cobb must have some magic. Great gains. Stage 2 in the mix ever?

85Gold

John at BGB is a tuner who is conservative and very track oriented. In my experience several cars worth his tunes will run for full 30 min sessions at Sebring in the summer and not pull power. I also like that he follows the NASA dyno protocol on all his tunes Dynojet SAE correction smoothing 5.

Peter

Avera

@BGB Motorsports

When you say ‘dumping filters,’ I am under the impression you are referring to cats/resonators from headers and OAPs?

In other words, with regard to exhaust modifications, stage 1 tune is not intended for anything more than swapping out the OEM rear box? Pretty typical that most stage 2 maps tend to be developed for ‘increased flow.’

I sense COBB is focused on not offering stage 2 mapping because they want keep everything emissions compliant. More than that, given the multitudes of aftermarket header/OAP/rear box replacement options, I think this is wise because it would be nearly impossible to produce a generic map that suits all the different ‘flows’ that could be produced. In other words, after stage 1, it seems every aftermarket tune should be individualized (e.g. pro-tunes). Better for both the tuners and consumers in the long run.

Avera

COBB Tuning

Peak HP is about 402 WHP and peak TQ is about 312 ft. lbs. at the wheels.

It's absolutely possible. When picking our charts, we try to go with what's the best representative example of a calibration. If I get an errant stock run that makes super low power, I don't keep it for consideration for marketing material. On this car, the most important thing was to perform all the marketing runs on the same day with a sufficient cooling setup in the dyno cell.

There's definitely some magic. We won't spoil everything but one thing that I do like to point out is that the primary difference between the GTS and the Spyder/GT4 was the throttle control. OEM calibration on the GTS commands it to close aggressively at high RPM to limit power whereas the Spyder/GT4 let it remain fully open. This accounted for ~90% of the power difference between the two. The power we got on top of that is a mixture of a lot of things.

We aren't likely to make an OTS Stage2 map due to emissions. But that doesn't mean we don't have other maps to look forward to!

- Andrew

Clark_Kent

Thanks for the explanations. Can you share why the dyno charts end at around 7,500 RPM well short of redline and fuel cut?

Avera

@COBB Tuning

In your testing, what did you find represented the weak link, or limiting factor?

For example, I had a 2018 Macan Turbo with a COBB stage 1 tune. As was quite commonly encountered and reported on the forums, the tune produced too much boost pressure for the stock diverter valves (weak link). Short of replacing the diverter valves, I could not get any pro-tune to overcome the issue.

By no means meant to disparage COBB or your tunes. You have a great reputation for producing great tunes. I am simply inquiring what OEM component(s) was a limiting factor in your GT4 stage 1 tune?

Avera

COBB Tuning

For our purposes during testing, we kept the runs short to avoid bouncing off the rev limiter too many times. I probably logged several hundred pulls in this car per month. Since we had already achieved peak power by 7500 RPM, we kept it on the conservative side to keep the car safe. Once we have the car back from emissions testing, I can definitely give it a few full sends for a full graph!

The biggest factor on these cars is heat. They're extremely prone to heat soak and the airflow into the side ducts isn't great, especially on a dyno. If you plan on live monitoring with an AP, I would definitely watch temps. We did some work to try and manage how the ECU responds to the heat but it's unavoidable. So cooling mods definitely help!

Avera

Thank you sir

Avera

c1pher

Yes I understand that but trying to understand how that compares to Porsche’s advertised 394hp/309tq figure.

FreshDriver

I think it may be more than 460HP@crank

COBB Tuning

Correct. Porsche typically publishes numbers at the crank. During engine development. They'll typically tune the engine outside the car as it gives them much better control over environmental factors and allows for much faster work.

TXshaggy

They list the percentage gained on their maps note page.

Seems like you could do some math and get close.

https://cobbtuning.atlassian.net/wik...ges/2718007297