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MarkMeyers MarkMeyers is offline
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Default Jerky WOT pulls Map1 - 430i B48 - 02-11-2018, 03:18 PM

Hi,
looking for advice on my 2018 BMW 430i, B48 Engine. No mods except JB4. Use Ultimate 102 octane (RON) fuel.

I run Map1 on the JB4 with Firmware 8 and all setting to default. WOT pulls are not smooth and I can hear the wastegate rattle (working) during that time. Even in Map1 my fuel trim seems to reach nearly 50 around 2000 rpms. Logs with Map1 attached.

In Map4 (and Map0 of course) the car pulls normal without any issues, smooth as it should be.
I have EWG wires and FF wires installed as well, if it is useful for troubleshooting.

Any help would be greatly appreciated.
Attached Files
File Type: csv 2018-02-11 18_35_50.csv.csv (9.9 KB, 35 views)
File Type: csv 2018-02-11 19_06_27.csv.csv (11.0 KB, 23 views)
File Type: csv 2018-02-11 19_11_58.csv.csv (4.7 KB, 19 views)
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 02-11-2018, 05:26 PM

Log seems smooth to me. I don't see anything we could do to improve it.
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MarkMeyers MarkMeyers is offline
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Default 02-12-2018, 04:49 AM

Thanks Terry!

Is there any way to get rid of the dip in RPMs around 2000 - 2200 RPMs? There is also the throttle closing a little bit and I can feel a short lag while accelerating.
Is it something that might go away over time by adaption of the JB4 and/or the DME?
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MarkMeyers MarkMeyers is offline
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Default 02-13-2018, 10:41 AM

Ok, switched to Map3 now and adjusted duty bias and PID gain.
Pulls at full and partial throttle are much smoother now.

Can you review the new logs to make sure I did not screw up anything?
Attached Files
File Type: csv 2018-02-13 17_39_59 (v8).csv (7.1 KB, 30 views)
File Type: csv 2018-02-13 17_42_12 (v8).csv (7.1 KB, 22 views)
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Default 02-13-2018, 12:55 PM

Typical B58 and is running pretty lean but otherwise looks normal.



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