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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > N55 Not reaching boost target on MHD Stage 1



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      06-18-2022, 01:27 PM   #1
Zawislak
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N55 Not reaching boost target on MHD Stage 1

n55 e92 xdrive
xhp 3 mhd stage 1
everything stock, only charge pipe changed for aluminium one.
I have a problem with the boost target. I see from my logs that I am not hitting the boost target and the difference between actual boos and target is like 0,2/0,4 bar so like 3/4 psi.
The car drives perfectly fine and i do not feel any lag.
Today I changed all the gaskets/orings in turbo pipes and in throttle body (valve). I also cleaned the sensors and the pipes. After the change the curves look maybe a little bit smoother but the gap is still big... I know that some gap i acceptable but not such a big one. Anyone have any clue what can I do next ? As I checked all the pipes and changed gaskets for the new ones I doubt for the boost leak.
Log 3d gear before change:
https://datazap.me/u/zawislak/3rd-ge...=0&data=3-4-12
2 logs after the change
https://datazap.me/u/zawislak/3rd-ge...r-orings?log=1...
Update:
I did the log o 3d gear with stage 0 map (stock power) and boost control is perfectly fine..
https://datazap.me/u/zawislak/3d-gear-stock-map?log=0...
Basically now i realised that I reach more boost on stage 0 than on stage 1

Last edited by Zawislak; 06-18-2022 at 01:36 PM..
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      06-20-2022, 12:42 PM   #2
anjuna
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WGDC too low
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