Hey folks! I'm looking for help troubleshooting P0299 underboost code, starting at 4000 RPM at stage 1 tuning.

[SirJack]

I keep getting about 0.2-0.25 bar underboost starting at 4000 rpm in 3rd gear and I cannot figure out exactly why. I'd like some advice on what the cause is. I hope it's just a flow issue from the intake, but I don't know anyone who can help me test it. I'm hoping someone has the time and is willing to help me out with this. I'm located in The Netherlands. I've posted a table with my boost measurements, maybe someone recognizes the issue in this from experience and can help me out that way.

RPM	Boost demand​	Boost actual​	Average shortage​
3800–4000 rpm	2,421 bar​	2,408 bar​	0,013 bar​
4000–4500 rpm	2,543 bar​	2,533 bar​	0,009 bar​
4500–5000 rpm	2,542 bar​	2,300 bar​	0,242 bar​
5000–5500 rpm	2,543 bar​	2,303 bar​	0,240 bar​
5500–6000 rpm	2,520 bar​	2,329 bar​	0,191 bar​
6000–6500 rpm	2,510 bar​	2,353 bar​	0,157 bar​

Thanks for taking the time reading about my issue.

 

[Syphon]

Hi and welcome, head on over to your model forum for some advice, I'm sure someone will be able to help.

Thanks for joining!

Cheers,

Scott