data log help. Concerned about boost

[makoskey]

I have a 2011 Z4 35IS Stage 2+ . Catted Hi flow DPs and FlexFuel(Stock Feul Pump). Using E40 mix right now. Wondering why my target boost and actual are not the same?

Any help would be greatly appreciated! Pull was in third and there was a few times where it felt like it lost traction.

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[carabuser]

Just looks like a boost leak. Could also be that one boost solenoid is bad or there is a vacuum leak in the piping to them.

 

[makoskey]

Just looks like a boost leak. Could also be that one boost solenoid is bad or there is a vacuum leak in the piping to them.

I have been all over my intake, swapped out the boost solenoids and still have the same issue. Commanded says 18PSI but max I ever see is 14-15. Running stage 2+ mhd with Motiv ethanol. 2011 z4 35is.
No Check engine and it runs great.

I was ready to give up until I saw this thread here:

E89 Z4 INOAS boost ceiling with MHD Question

Hey guys, I am new here, looks like allot of valuable info is to be had in these forums. I have a question that I have asked on other forums a while back, However I have never had an answer and I am hoping that the Z4 people out there on this forum can answer. I know the E89 Z4 although N54...

www.spoolstreet.com

It is spot on with the issue I am having. I saw you have done a lot of tuning so if you are interested PM me if you can fix this! I dont post on here much so cant PM you directly yet.

 

[carabuser]

That thread is nonsense. You most likely have a boost leak, you need to check the charge pipework not the intake.

 

[makoskey]

Ok didn’t even think of the charge pipe. I will work on it here in a few weeks and let you know.
Thanks for the help!