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carlospineda93 carlospineda93 is offline
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Join Date: Jul 2017
Car: 2011 BMW 335i
Default N55 JB4 MHD E85 not hitting target boost. - 11-14-2017, 11:49 AM

So I currently have a 2011 335i with a JB4, Intercooler, Intake, DPP, and stage 2 LPFP while also running the MHD back end flash and running E85 about 60% mix. My current problem is that my target boost is not being met. I top out at 11psi. I have attached a log. Does anyone see anything that not normal?
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File Type: csv 2017-11-14 11_53_00.csv (17.3 KB, 9 views)
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Suckadeez Suckadeez is offline
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Posts: 59
Join Date: Dec 2016
Car: 2011 335xi
Default 11-14-2017, 04:10 PM

Seems like once you floor it boost hits target but then quickly drops down and matches the ecu psi instead of target. Also your not running meth but it seems to be reading meth flow at 100 even before you go wot. Doesn't look like a boost leak my guess is wiring. When did you install the jb4? Did you try a map 2 or 6 log May be in a lower gear.

2011 335xi e92
deep sea blue metallic
Mods: ps2; cobb fmic; vrsf ⬇️pipe; phoenix racing cp; injen cai; pure inlet; fuel it stage 2 lpfp w/ sensor; jb4 w/mhd e85 bef; meth 90/10 do3 and do7 nozzles. n20 tmap. Alpina flash. Pi install coming soon
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
Posts: 22,505
Join Date: Jan 2008
Default 11-14-2017, 04:13 PM

FF reset to 0. change to 100. If it keeps resetting at 0, email us for a replacement 2580 chip to fix the issue.

There is also a FUD bit you can set to lock it at 100 if needed. It's in the firmware notes.
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