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romnation romnation is offline
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Default Looks like I might be overboosting? Shift lag (Automatic) What do I need to adjust? - 11-28-2017, 09:47 AM

Currently running map 5, car is completely stock. 09 135i. Looks like I'm hitting 15.3 PSI near the shift from 2nd to 3rd gear, which is over max target boost level of 13.8. The car seems to lag a bit and is jerky during this shift, like there is a slight delay. What do I need to adjust? All my jb4 settings are currently stock as well. I'm new to the jb4, so I could use some advice. I haven't noticed this at any other point besides during this particular gear shift. When I did this same gear shift run yesterday, it was even worse, but I was unable to log that one.

i have attached my .CSV log to this post.
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File Type: csv jb4.csv (36.6 KB, 19 views)

Last edited by romnation; 11-28-2017 at 09:53 AM..
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Default 11-28-2017, 08:19 PM

Poor log...please do a 3rd gear log from 2k to redline so the Jb4 can adapt.

Did you buy this JB4 used?



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romnation romnation is offline
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Default 11-29-2017, 07:43 PM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
Poor log...please do a 3rd gear log from 2k to redline so the Jb4 can adapt.

Did you buy this JB4 used?
No, JB4 was purchased brand new. I won't have the car for awhile as I'll be out of town. I'll try to get another log in a week or so once I get a chance.
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Default 11-29-2017, 09:58 PM

Sounds good.

Sometimes people buy used JB4's and there are various settings that have been changed.



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romnation romnation is offline
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Default 12-25-2017, 11:25 PM

I've finally had time to do a log. I did not notice any weirdness when doing the third gear pull with the transmission in manual mode, but here is the log. It is the 12-23 log.



I'm also having another separate issue now. When accelerating lightly at highway speeds between about 65-85mph, the car seems to hesitate and lurch forward and backward. If I add more throttle the problem goes away. No issues with WOT either. The issue seems to be getting worse and it actually triggered these 3 codes, although I can not get the car to trigger them again after clearing.

2D2E - Angle of throttle valve - intake pipe underpressure, correlation
30FE - Boost over target

When I cleared the CEL, jb4 set itself to Map 0, and the problem remains in Map 0. I did a log of the lurching (It is the the 12-25 log).
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File Type: csv 2017-12-23 14_29_58.csv (68.7 KB, 10 views)
File Type: csv 2017-12-25 22_39_50.csv (73.1 KB, 12 views)
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Default 12-27-2017, 01:59 PM

Odd...the JB4 does not normally kick you to map 0, map 4 is the safety map that it generally kicks you to.

If the issue is still present on map 0, that would typically indicate a hardware issue.

Have you verified the settings for menus 11 and 12 with the steering wheel controls? If menu 11 is set to 0, try setting it to 1500.



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romnation romnation is offline
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Default 12-28-2017, 02:50 AM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
Odd...the JB4 does not normally kick you to map 0, map 4 is the safety map that it generally kicks you to.

If the issue is still present on map 0, that would typically indicate a hardware issue.

Have you verified the settings for menus 11 and 12 with the steering wheel controls? If menu 11 is set to 0, try setting it to 1500.

Menu11 was set to 0. I set it to 1500 and it seems to have gotten slightly better, but it it still pretty prevalent. Menu12 is set to 2700 currently. Happens on both map 5 and map 0.

I also just found out that battery is dying on this car. What luck I have! (yellow battery icon came up on the dash). This wouldn't somehow be related to the problem would it?

I've uploaded a video of the surging here. I'm holding the throttle perfectly steady. If you turn your sound up very loud and listen carefully, you can hear the engine hesitate and the rpms drop a bit.

https://www.youtube.com/watch?v=4cGPhrmCsuI

Do you still suspect this is a hardware issue Steve, or should we try something else? Also when you say hardware issue, do you mean the jb4 itself, or an issue somewhere else with the car?
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Default 12-28-2017, 10:48 PM

Try bumping menu 11 up more to see if it smooths out more.

A bad battery can cause a variety of issues as these cars are heavily dependent on the electrical system.



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romnation romnation is offline
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Default 12-30-2017, 02:17 AM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
Try bumping menu 11 up more to see if it smooths out more.

A bad battery can cause a variety of issues as these cars are heavily dependent on the electrical system.
Got a new battery installed in the car and tried bumping up menu11 some more. Tried 2k, 3k, 4k... no change unfortunately. Still having the same issue.

Last edited by romnation; 12-30-2017 at 03:36 AM..
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Default 01-02-2018, 07:14 PM

Sounds like you are trying to compensate for a hardware issue.



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romnation romnation is offline
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Default 01-10-2018, 10:16 PM

Stupid question, but do the menu11 and menu12 adjustments do anything if you're running map 0?
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Default 01-11-2018, 09:43 AM

No they do not.


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Default 01-11-2018, 10:56 AM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
Sounds like you are trying to compensate for a hardware issue.

Steve, I took the car to an independent BMW specialist shop today and they couldn't find much, but are recommending giving replacing the boost pressure sensor a shot.

Is it worth playing with the menu12 and menu10 settings before throwing parts at the car? We've only really messed with menu11 so far.

Also LessIsMore, I just spoke with Jon over at BMS and he said those settings DO have an effect in Map 0 on this car.
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Default 01-11-2018, 11:02 AM

No harm in adjusting menus 11 and 12. don't usually see a boost sensor fail...boost solenoids though, that is a different story.



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Default 01-14-2018, 11:56 AM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
No harm in adjusting menus 11 and 12. don't usually see a boost sensor fail...boost solenoids though, that is a different story.
Steve, it looks like adjusting menu12 to 2400RPM solved 99% of my problems. Will I have any negative effects from running it this low? Should I run a new log to make sure I'm not underboosting? Also, should the "Reset adaptions" function be used if I performed a firmware upgrade on the unit?

Last edited by romnation; 01-14-2018 at 06:07 PM..
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Default 01-14-2018, 10:31 PM

Nice...yes, upload a new log for us to review.

No need to reset adaptions for a firmware update.



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