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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 > 2010 335i FBO JB4 Map 2 Running Lean



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      02-01-2019, 04:13 PM   #1
Salahda
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2010 335i FBO JB4 Map 2 Running Lean

Bought a bone stock 2010 335i 6MT a month ago with 56k miles(57k now) and put full bolt ons on it since then:

-VRSF Charge Pipe w/ Tial BOV
-VRSF 7" Intercooler
-VRSF Catless Downpipes
-BMS DCI
-JB4(Map 2 during these pulls)

I didn't have enough room on the road to rev it out all the way to redline in 3rd, so these pulls are only to about 5500 rpm, but they show the issue that I've been having. Occasionally JB4 is switching to map 4 on its own, which was what initially indicated to me that there was a problem(at first I figured I was overboosting and hitting the boost safety). I'm running a 14-15 AFR under WOT until about 4500 RPM, which is pretty scary to me. I'm assuming this is why I'm going into map 4 sometimes. I thought you are supposed to run 12-13 AFR's under WOT?

I also couldn't convert the JB4 CSV file to a file that this website will accept because I'm at work at the moment and don't have excel on this computer. I am getting a lean AFR on map 1 and map 5 as well.
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      02-01-2019, 07:33 PM   #2
Mike@N54Tuning.com
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Add the JB4 CSV log, photo doesn't show everything.

Mike
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      02-02-2019, 10:26 AM   #3
Salahda
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CSV Files

https://www.filehosting.org/file/det...27%20Map-2.csv

https://www.filehosting.org/file/det...53%20Map-2.csv
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      02-02-2019, 01:42 PM   #4
Mike@N54Tuning.com
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Sorry link isn't working. Post the CSV to the n54tech support forum, someone there can review it for you and offer advice.

Mike
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      02-02-2019, 02:17 PM   #5
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Jeez, alright. Thanks Mike.
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335i, fbo, jb4, lean, log, logs, map 2, map 4, n54


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