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mattgc13 mattgc13 is offline
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Default Boost Over Safety Help Please - 09-11-2021, 11:19 PM

I have been dealing with this issue for awhile, and have tried a bunch of JB4 settings. Any suggestions are welcome I have run out of ideas. As you can see on these logs (it combined two logs taken within 10 minutes), my boost spikes very high during the beginning of a WOT pull. It feels like it is bucking when it cuts my boost off, usually it kicks me down to map 4, a few times it has even thrown me into limp mode. In between these runs I cleared my codes, which also are a mystery to me. Today I unplugged all connections on my JB4, except fuel rail because it's a pain in the ass, and cleaned them all to ensure that wasn't an issue. The airmass too low code can be ignored I believe that was from me starting the car with my intake off earlier today, chasing down a whining noise in that area under the intake, near the fuel pump but it seems like the alternator to me. None of these attached codes have thrown a check engine light, idk if this has to do with the BEF? Previously it was suggested to me to check my wastegate arm to see if it was physically hitting my dp coupling, and I have confirmed that is not the case. The codes coming up are pretty random seeming, and don't really stay consistent, not sure if they are related at all. When driving car normally it is completely fine.

I am running ******* dp, step colder plugs, 91 octane and JB4 + BEF on a 2011 6MT 335i e90. I have messed with ethanol mixes (e54 in arizona ), did not help my situation lol.
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File Type: csv P5_M1_R2_210911_2136.csv (24.2 KB, 10 views)
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mattgc13 mattgc13 is offline
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Default 09-11-2021, 11:22 PM

Quote:
Originally Posted by mattgc13
I have been dealing with this issue for awhile, and have tried a bunch of JB4 settings. Any suggestions are welcome I have run out of ideas. As you can see on these logs (it combined two logs taken within 10 minutes), my boost spikes very high during the beginning of a WOT pull. It feels like it is bucking when it cuts my boost off, usually it kicks me down to map 4, a few times it has even thrown me into limp mode. In between these runs I cleared my codes, which also are a mystery to me. Today I unplugged all connections on my JB4, except fuel rail because it's a pain in the ass, and cleaned them all to ensure that wasn't an issue. The airmass too low code can be ignored I believe that was from me starting the car with my intake off earlier today, chasing down a whining noise in that area under the intake, near the fuel pump but it seems like the alternator to me. None of these attached codes have thrown a check engine light, idk if this has to do with the BEF? Previously it was suggested to me to check my wastegate arm to see if it was physically hitting my dp coupling, and I have confirmed that is not the case. The codes coming up are pretty random seeming, and don't really stay consistent, not sure if they are related at all. When driving car normally it is completely fine.

I am running ******* dp, step colder plugs, 91 octane and JB4 + BEF on a 2011 6MT 335i e90. I have messed with ethanol mixes (e54 in arizona ), did not help my situation lol.
Also want to include, during my second pull I let off because it was cutting boost so bad it did not feel very healthy. Also scanned codes after run 2 and nothing came up, but it did kick me to map 4 after the second run.
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Terry @ BMS's Avatar
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Default 09-12-2021, 08:36 PM

A few things going on here.

For starters lets see a photo of the JB4 control board inside its enclosure.


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Default 09-13-2021, 08:15 PM

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Originally Posted by Terry @ BMS
A few things going on here.

For starters lets see a photo of the JB4 control board inside its enclosure.
I bought this used, silly of me to assume the diode was cut but I guess I may have neglected looking into that, do I need to do that? The solder on the outer black one looks not very intact...
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Default 09-14-2021, 11:25 AM

Diode is supposed to be cut for E series if you have soldered it back together, that might be the issue.


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Default 09-14-2021, 11:28 AM

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Originally Posted by Payam @ BMS
Diode is supposed to be cut for E series if you have soldered it back together, that might be the issue.
I did not mess with anything on the board since I got it. I couldnt really find any examples of the E9x n55 boards with a diode cut, should I cut that far left black diode completely out?
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Default 09-14-2021, 01:04 PM

Yes, cut the diode, then relog.


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Default 09-14-2021, 02:28 PM

Quote:
Originally Posted by Terry @ BMS
Yes, cut the diode, then relog.
Ok I will complete that later today. Just to confirm, this is the correct diode that needs to be cut?
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Default 09-14-2021, 09:02 PM

Alright, figured it out by looking at the F series n55 boards, literally couldnt find anywhere else with a specified picture of that diode being cut for the e series n55, but I figured it was the same. I cut the diode, and reflashed the iso for good measure. Im not sure if it is placebo effect, but it did seem smoother, however it still bucked a few times and kicked me into map 4 on my final run. Attached are a couple runs that I did the one with the time 20:38:38 was a full pull that kicked me into map 4, and was still severely overboosting.
Attached Files
File Type: csv P5_M1_R1_210914_203838.csv (12.7 KB, 8 views)
File Type: csv P5_M1_R1_210914_202905.csv (18.5 KB, 11 views)
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Default 09-17-2021, 05:55 PM

Quote:
Originally Posted by Terry @ BMS
Yes, cut the diode, then relog.
Any thoughts on the above logs Terry? Thank you
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Default 09-20-2021, 09:06 PM

Still over boosting, photo of cut diode?

Unplug blue solenoid connection leaving solenoid disconnected and do another map1 log to confirm boost is stuck at 3psi.


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Default Yesterday, 11:03 AM

Quote:
Originally Posted by Terry @ BMS
Still over boosting, photo of cut diode?

Unplug blue solenoid connection leaving solenoid disconnected and do another map1 log to confirm boost is stuck at 3psi.
This is the cut diode, I will log with boost solenoid unplugged tonight. Thank you so much for your help.
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Default Yesterday, 07:10 PM

Next will be inspecting your wastegate operation and make sure it's not stuck or hitting anything.



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