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StuOne19 StuOne19 is offline
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Car: E90 335i xDrive 6MT
Default No boost after JB4 install - 12-19-2021, 02:14 PM
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
Attached Files
File Type: csv 211218_1100.csv (16.3 KB, 90 views)
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Cannon @ BMS Cannon @ BMS is offline
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Default 12-20-2021, 12:20 PM
Make sure all connections are secured.

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Steve @ BMS/Fuel-It!'s Avatar
Steve @ BMS/Fuel-It! Steve @ BMS/Fuel-It! is offline
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Default 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?


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StuOne19 StuOne19 is offline
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Default 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?
Last edited by StuOne19; 12-22-2021 at 04:43 PM..
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Steve @ BMS/Fuel-It!'s Avatar
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Default 12-22-2021, 01:30 PM
Aw....bought your JB4 used?


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StuOne19 StuOne19 is offline
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Default 12-22-2021, 04:42 PM
Quote:
Originally Posted by Steve @ BMS/Fuel-It!
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?
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StuOne19 StuOne19 is offline
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Default 12-22-2021, 05:02 PM
Quote:
Originally Posted by StuOne19
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
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Default 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.


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StuOne19 StuOne19 is offline
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Default 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.
Last edited by StuOne19; 01-20-2022 at 01:57 PM..
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