BMW 3-Series (E90 E92) Forum - View Single Post

TheGoodTheBadTheUgly · 11-02-2019, 05:37 PM

Hey guys, I have been tracing some high IATs and overboost for quite a while.

Usually MHD Stage 2+ targets about 18 Psi of boost, but for some reason my car overboosts to crazy numbers. I had to buy the N20 TMAP just to get better data. I've hit 28 Psi with the sensor and I am pretty sure I did more than this before having the sensor and knowing...

I decided not to push the car anymore until I've got another used but working boost solenoid from another 335. Installed it yesterday and I did a log today but with same results as before. Overboosting and active wastegate cycles.

I don't know what do to or where to look at anymore. Here is the log:

https://datazap.me/u/thegoodthebadth...og=0&data=4-20

Could it could be the vacuum line? I wouldn't suppose it because then I would constantly have a boost problem I think. Could the wastegate's simple mechanics be failing?

Also, can the Diverter Valve be at the base of this behaviour. In my mind a bad diverter valve would cause underboost, am I wrong?

11-02-2019, 05:37 PM	#1
TheGoodTheBadTheUgly Captain 257 Rep 674 Posts Drives: 2011 E90 335i xDrive Join Date: Feb 2018 Location: Gatineau iTrader: (0)	MHD Stage 2+ 27+ Psi overboost Hey guys, I have been tracing some high IATs and overboost for quite a while. Usually MHD Stage 2+ targets about 18 Psi of boost, but for some reason my car overboosts to crazy numbers. I had to buy the N20 TMAP just to get better data. I've hit 28 Psi with the sensor and I am pretty sure I did more than this before having the sensor and knowing... I decided not to push the car anymore until I've got another used but working boost solenoid from another 335. Installed it yesterday and I did a log today but with same results as before. Overboosting and active wastegate cycles. I don't know what do to or where to look at anymore. Here is the log: https://datazap.me/u/thegoodthebadth...og=0&data=4-20 Could it could be the vacuum line? I wouldn't suppose it because then I would constantly have a boost problem I think. Could the wastegate's simple mechanics be failing? Also, can the Diverter Valve be at the base of this behaviour. In my mind a bad diverter valve would cause underboost, am I wrong? __________________ TOTALED \| 2011 E90 335i xDrive - BMS Cold Air Intake - ETS Charge Pipe - ETS 7" FMIC - MHD Stage 2+ - GFB DV+ - PE Mod - VRSF Catless Downpipe - xDelete - xHP Stage 3 2015 E84 X1 35i M-Sport Last edited by TheGoodTheBadTheUgly; 11-02-2019 at 05:48 PM..
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