[Blackbeem]

Hey guys new member just installed a brand new jb4 G5 ISO and I’m getting a weird surging issue at 2500-3000 rpms only on slightly aggressive acceleration. Almost as if my fuel is being cut off and on. If I’m really easy on the throttle or if I go WOT it’s fine. I’ve tried messing with menu 10 and 12 but no luck. I’ve posted a wot log from 3rd to 4th to see if u guys can tell if something is ****ed up. the only mod on the car is A BMS DCI. coils plugs and oil were just changes as well. I’m a complete noob when it comes to tuning and the N54. I also get overboost safeties sometimes and it’ll go into limp mode once in a while.

[fredcase]

Vanos

[Blackbeem]

Originally Posted by fredcase

Vanos

Could the vanos solenoids be acting up without throwing codes? I did have one over retard my timing before the jb4 was installed but I pulled them out and cleaned them and its been fine since

[Terry @ BMS]

Looks like WGs are tight. Maybe menu12 is set too high? Try lowering it to see if things smooth out.

[Blackbeem]

Originally Posted by Terry @ BMS

Looks like WGs are tight. Maybe menu12 is set too high? Try lowering it to see if things smooth out.

its set at 2800 right now but Ive had it all the way down to 2300 it still did it. Ill try it again tomorrow and see if it changes. Heres a log of the surge while I was on the freeway, you'll notice right around the 3000 rpm range my boost is fluctuating from 13 psi to 7 and back up again.

[fredcase]

Might be worth another quick cleaning and swapping of the vanos. Super fast and easy. If there is an improvement, your on the right track.

[dmdodd83]

I'm not trying to thread-jack right now, but I'll be very interested to hear what solves this, as I believe I'm having exactly the same issue. Just to confirm, it doesn't do it when the JB4 is OFF.

I downloaded my *.csv the other day and had a hard time reading/reviewing it, so made a draft excel sheet that'll chart some basic parameters (and I'll add more charts etc. to in the future).

See attached charts for both Blackbeem's and my JB4 data.
I tried to upload the *.xls files (including my calcs/charts), but they're over 1MB and the site won't allow it. Y'll can get them here if interested: for N54Tech Community - Google Drive

I've also uploaded screenshots of the User Settings from my JB4 app if that helps...?

What I don't understand is:
(1) If folks are having surging/pulsation issues with the JB4 and are having to change this 'Menu 12', why doesn't the JB4 automatically come pre-programmed to lower settings that don't cause these issues?
Or is it because perhaps we inadvertently changed the menu12 settings, or perhaps most cars this isn't an issue, just a few like mine and Blackbeem's?

(2) Any ideas what the root cause is requiring us to lower the Menu 12 Base Duty Cycle?

(3) Does the JB4 app have access to all the 'Steering Wheel Controls', and if not, why not? Can we ask the developer of the App to include them all into the app?

Thanks in advance and happy to be a new member and hopefully add intelligently and helpfully to the community

Dan
Bay Area.

[Blackbeem]

Mine does it while on map 0 as well but I have the jb4 G5 iso and from my understanding it still controls boost when on 0... the car had absolutely no issues before I installed the jb4 so it has to be an issue the jb4 itself or some settings. Haven’t tried removing the jb4 completely yet but I might have to cause it’s annoying af. I think maybe the jb4 and my ecm are both trying to control boost and it’s keeps surging cause one ecu is fighting the othe. Idk I’m at a loss tho

[K.Jameel]

Originally Posted by Blackbeem

its set at 2800 right now but Ive had it all the way down to 2300 it still did it. Ill try it again tomorrow and see if it changes. Heres a log of the surge while I was on the freeway, you'll notice right around the 3000 rpm range my boost is fluctuating from 13 psi to 7 and back up again.

Try down till 1000 or 500RPM

[Indo Rider]

Does menu 12 even accept values that low? I thought the range was 2000 to 3000...

[nefariousminion]

Originally Posted by Indo Rider

Does menu 12 even accept values that low? I thought the range was 2000 to 3000...

I just set to defaults yesterday, Menu 10 to 3000 and Menu 12 to 2800 (should be able to adjust down to 100). It helped a little, finally able to hit at least 8 lbs but i still have bad oscillations unless I WOT. OP do you have a bov? do you also hear the bov chirping on the oscillations? All conversations I've had suggest its wastegate control related i.e. leaking vacuum lines, bad boost solenoids, overboost or jb4 not adjusting wastegates properly.

Edit: OP see E Series N54 thread. Just did a search on that thread for surging, oscillation, etc.. lots of posts about this. GL!

[sportinsflying]

Originally Posted by nefariousminion

I just set to defaults yesterday, Menu 10 to 3000 and Menu 12 to 2800 (should be able to adjust down to 100). It helped a little, finally able to hit at least 8 lbs but i still have bad oscillations unless I WOT. OP do you have a bov? do you also hear the bov chirping on the oscillations? All conversations I've had suggest its wastegate control related i.e. leaking vacuum lines, bad boost solenoids, overboost or jb4 not adjusting wastegates properly.

Edit: OP see E Series N54 thread. Just did a search on that thread for surging, oscillation, etc.. lots of posts about this. GL!

Anyone know the settings for 3.5 bar TMAP and a 2.5 TMAP in JB4? - N54Tech.com - International Turbo Racing Discussion

check this post out. i am using the stock TMAP and had the same issues. changed the TMAP setting and it sorted itself out. not sure if that's the right fix, but it worked for me. Hope this helps.

[vt335iguy]

I am totally new to jb4 and have this same issue... A couple noob questions: 1. do user settings stay saved when car is turned off and 2. what is menu 12? (i have read a lot of mention of 10, 11, 12 but they are not labeled as such on user settings and the values spoken of here don't seem to correspond to how the menus are displayed.)

Thanks

[nefariousminion]

Originally Posted by vt335iguy

I am totally new to jb4 and have this same issue... A couple noob questions: 1. do user settings stay saved when car is turned off and 2. what is menu 12? (i have read a lot of mention of 10, 11, 12 but they are not labeled as such on user settings and the values spoken of here don't seem to correspond to how the menus are displayed.)

Thanks

I believe the settings are written to memory, so they dont reset when you turn the car off. The JB4 will adjust some settings over time, as long as you dont have learning disabled.

This page does not leave my phone's browser :
N54 Steering Wheel Controls - JB4Wiki

[dee_mm_cee]

I have this surging issue as well in maps 1 and 5. The car cuts boost fairly hard under moderately aggressive throttle. My cluster is km/h (Canada car) so I am having a hard time understanding getting to the menus. I have the mobile app but all the settings I see referenced are discussed in rpm values on the tach. I don’t trust my gauge is calibrated properly and can’t find clear step by step on how to do menu 5. I had a knowledgeable BMW specialist install the JB4 as well as FBO and 17T eBay hybrids. I am running the USA pump BEF. I have fresh vanos phasers and solenoids as well as injectors - all genuine BMW parts.

I could really use some help on base line settings to pull a log with values as they are presented in the app for menus 10, 11 & 12. I am super appreciative of any help given.

[Cannon @ BMS]

Originally Posted by dee_mm_cee

I have this surging issue as well in maps 1 and 5. The car cuts boost fairly hard under moderately aggressive throttle. My cluster is km/h (Canada car) so I am having a hard time understanding getting to the menus. I have the mobile app but all the settings I see referenced are discussed in rpm values on the tach. I don’t trust my gauge is calibrated properly and can’t find clear step by step on how to do menu 5. I had a knowledgeable BMW specialist install the JB4 as well as FBO and 17T eBay hybrids. I am running the USA pump BEF. I have fresh vanos phasers and solenoids as well as injectors - all genuine BMW parts.

I could really use some help on base line settings to pull a log with values as they are presented in the app for menus 10, 11 & 12. I am super appreciative of any help given.

Do you have the bluetooth connect kit? You will need to to record a log and upload it. Here's the link to it.
https://burgertuning.com/products/jb...5038e2ef&_ss=r

[Cannon @ BMS]

Originally Posted by dee_mm_cee

I have this surging issue as well in maps 1 and 5. The car cuts boost fairly hard under moderately aggressive throttle. My cluster is km/h (Canada car) so I am having a hard time understanding getting to the menus. I have the mobile app but all the settings I see referenced are discussed in rpm values on the tach. I don’t trust my gauge is calibrated properly and can’t find clear step by step on how to do menu 5. I had a knowledgeable BMW specialist install the JB4 as well as FBO and 17T eBay hybrids. I am running the USA pump BEF. I have fresh vanos phasers and solenoids as well as injectors - all genuine BMW parts.

I could really use some help on base line settings to pull a log with values as they are presented in the app for menus 10, 11 & 12. I am super appreciative of any help given.

Make sure to select menu 5/3 for metric config.

[dee_mm_cee]

Got my cluster figured out and smoothed out most of surging issues by setting menu 4 to BEF.

Thanks guys!