Hey all. I just got the Accessport installed on my 991.2 C2. It is an amazing power bump!! My only question for the group is simple. Does your factory boost gauge stop at 15psi? I've tested in all of the different drive modes and no matter which I select, the boost gauge stops at 15psi. The Cobb ECU map notes say that 18psi is the boost target, tapering off by 2psi towards redline.

My only thought to test further is to plug the accessport in and use the boost gauge built into it to compare.

 

Use the accessport to monitor as the gauge is only showing what the ECU thinks is happening.

 

Factory guage will only show 15 or 17 if GTS. Cobb will show full boost. But will have to subtract the atmospheric pressure of around 14.7

 

thanks so much.

 

The GTS will register up to 19, at least on my 2019 GTS.

 

Thanks for correcting me! 👍

 

You can alternatively rescale the factory boost gauge from the base 1 bar to 2 bar via PIWIS III if you have it available. I did it to my base C4: