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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Added dci and lost boost. Logs inside.



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      07-17-2015, 10:25 AM   #1
tmaghack
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Added dci and lost boost. Logs inside.

Can anyone take a look at my logs and tell me what they think?*
I installed bms dci today and looks like I lost some boost. Any suggestions?

First log is stock mhd stage 1 91
http://www.datazap.me/u/tmaghack/sta...og=0&data=4-20

Second is mhd stage 1 91 with dci
http://www.datazap.me/u/tmaghack/mhd...data=4-6-15-20
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      07-17-2015, 10:35 AM   #2
csu87
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your max boost went from 13.9 to 13.7.

You are fine.
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      07-17-2015, 11:02 AM   #3
tmaghack
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Ok I was just concerned with the boost fall off of two psi between the two logs.
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      07-17-2015, 01:01 PM   #4
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Quote:
Originally Posted by csu87 View Post
your max boost went from 13.9 to 13.7.

You are fine.
+1

Quote:
Originally Posted by tmaghack View Post
Ok I was just concerned with the boost fall off of two psi between the two logs.

you did not lose 2 psi.
You lost .2 psi which is irrelevant and within the margin of error
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      07-17-2015, 01:22 PM   #5
tmaghack
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I guess I was just concerned between the difference in boost at 5500 rpm. Sounds like I'm good. Thanks for the help guys.
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      07-17-2015, 01:47 PM   #6
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No, things don't look right. After 5k rpm, you seem to have lost about 1 psi until near redline where you lose 2 full psi. Peak boost is about the same in the midrange, but you've lost some at the top of the rev range.
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      07-17-2015, 02:13 PM   #7
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I figured he let of the throttle the way the boost curve is.

Appears to be a boost leak in each logs is my guess.
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      07-17-2015, 02:24 PM   #8
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Guess I have some searching to do then.
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      07-17-2015, 04:09 PM   #9
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Could it have anything to do with my low pressure fuel sensor being shot?
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