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motojunkie motojunkie is offline
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Join Date: Mar 2020
Car: 335i
Default Erradic throttle with JB4-throttle spikes - 11-19-2021, 01:44 PM

Hey guys, any help would be appreciated with this. Been dealing with it for a while. JB4 installed, mostly stock car only intake and blow off valve, stock exhaust. Running map 1 on JB4 with BEF on DME, selection 4 is set to 2 for BEF on JB4.

When I do WOT throttle, all seems pretty good. Under half/moderate acceleration there is a certain spot in the throttle where the car gets really jumpy and starts surging. I did a few runs logging and you can see a very visible spike in the throttle metric, it jumps to full while the pedal stays fairly flat. I verified I am on the latest JB4 firmware and same thing.

I will upload a log of 3rd gear full throttle and a 3rd gear half(ish) throttle.

I'm about to the point of just pulling the JB and reflashing to stock.

To note...I've seen similar issues that people have asked about...but I have never come across a solution that has worked for mine. Also it doesn't have this problem when the JB4 is physically removed. Anyone have any ideas?
Attached Files
File Type: csv 211119_1424-3rd-full.csv (12.3 KB, 31 views)
File Type: csv 211119_1423-3rd-half.csv (7.0 KB, 32 views)

Last edited by motojunkie; 11-22-2021 at 07:37 PM.. Reason: forgot to post files
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