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-   -   No boost after JB4 install (https://www.jb4tech.com/forums/showthread.php?t=67220)

StuOne19 12-19-2021 02:14 PM

No boost after JB4 install
 
1 Attachment(s)
Hello, recently installed a JB4 on my N54 E90 335i xDrive. loved it on my N55 135. Did a WOT pull shortly after installing and got a CEL... no big deal, the ECU needs time to adjust, right? I drove ~25 miles and have had the same issue anytime I go WOT. Even under partial throttle, there doesn't seem to be any boost building. I had no issues prior to the JB4 install. I upgraded to the latest firmware and logged 2 runs -- CSV files are attached in the .zip. The first was map0 for a baseline, seems like no boost at all, second was map1 - no boost either. is it possible I disconnected something during install? I do not have the cowl reattached yet.

edit: only the 2nd log on map1 seemed to record the entire run

Cannon @ BMS 12-20-2021 12:20 PM

Make sure all connections are secured.

Steve @ BMS/Fuel-It! 12-20-2021 04:38 PM

Aws stated, double check connections. You are right, you have no boost and WGDC is maxed out. Maybe a couple came loose on CP or damaged CP?

StuOne19 12-21-2021 07:46 PM

Just unplugged and reconnected everything. I’ll try to log a few runs tomorrow
I do have the NLS relay kit wired to the serial port but not powered. I also noticed a black wire with a flat-bladed pin attached, does this need to be connected somewhere? https://imgur.com/a/eDTH9mW?

Steve @ BMS/Fuel-It! 12-22-2021 01:30 PM

Aw....bought your JB4 used?

StuOne19 12-22-2021 04:42 PM

Quote:

Originally Posted by Steve @ BMS/Fuel-It! (Post )
Aw....bought your JB4 used?

Ya, I did… sounds like that extra connection wasn’t OEM. I can reach out to the previous owner and see what he used it for… any ideas?

StuOne19 12-22-2021 05:02 PM

Quote:

Originally Posted by StuOne19 (Post )
Ya, I did… sounds like that extra connection wasn’t OEM. I can reach out to the previous owner and see what he used it for… any ideas?

Looks like it might be for the anti-lag? I have the chip but not installed

Steve @ BMS/Fuel-It! 12-23-2021 01:01 PM

That's always the fun part of buying used...previous owner modifications, settings, etc. and trying to get it back to its original state. :(

StuOne19 01-20-2022 01:37 PM

so I can't figure out why there would be an additional tap for this cable in the grey connector. pin #5, I believe. I'll just insert the tip back into the connector on the other side (it has an opening on pin 5) and re-install tonight.
https://i.imgur.com/75SXKphh.jpg


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