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Sw4y1313 Sw4y1313 is offline
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Default VTT GCs 3rd gear boost issues - 06-25-2017, 10:57 AM

Good morning,

I don't usually ask for help with logs on this thing, but after flashing the newest firmware, 3rd gear boost target is almost completely ignored. Last night while I was doing some brake-boost runs, 3rd gear boost target looks to be almost completely ignored. Even if I rolled into 3rd gear it does the same thing. 4th gear no issues.

JB4 is on latest 32_8 firmware. That is honestly the only thing changed since I've had this running with Port Meth Injection (aside from my old FSB failing and injecting meth at idle).

Any ideas?
Attached Files
File Type: csv brakeboost1.csv (11.9 KB, 99 views)
File Type: csv brakeboost2.csv (12.3 KB, 107 views)
File Type: csv 2017-06-25 01_47_49 (jb4).csv (15.8 KB, 100 views)
File Type: csv map7 3rd gear brakeboost.csv (11.3 KB, 102 views)
File Type: csv map7 3rd gear.csv (11.8 KB, 111 views)


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Steve @ BMS/Fuel-It!'s Avatar
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Default 06-26-2017, 12:12 AM

I don't see it being ignored.

Pulling some timing.

Overboosting a little up top, but you can lower DB's. In addition, I'd put PID gain back to 25.



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Sw4y1313 Sw4y1313 is offline
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Default 06-26-2017, 09:00 AM

In 3Rd my boost just continues to climb past my target. That's why I say it looks like it's ignoring it. I had my db settings perfect up until I flashed new firmware. Now this starts to happen. I know timing is crap because It can handle 21psi on my current fuel, not 25+ like it was seeing.
Why would duty bias be all jacked up after firmware upgrade? I had that dialed in perfect before. And in 4th gear it holds boost fine too.


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N54QC N54QC is offline
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Default 06-26-2017, 02:33 PM

Quote:
Originally Posted by Sw4y1313
In 3Rd my boost just continues to climb past my target. That's why I say it looks like it's ignoring it. I had my db settings perfect up until I flashed new firmware. Now this starts to happen. I know timing is crap because It can handle 21psi on my current fuel, not 25+ like it was seeing.
Why would duty bias be all jacked up after firmware upgrade? I had that dialed in perfect before. And in 4th gear it holds boost fine too.
Weird part is I was experiencing the same thing after the update. I can't view your log from my work computer to see what it's doing but mine seemed to be off on the third gear pull and back on in 4th even though DB's were dialed in. Haven't pulled logs lately, it's just strange that you mentioned this as I was experiencing a similar thing after my update.


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Default 06-26-2017, 05:30 PM

May have been some changes in the new firmware that affect it, dial DB's in and you should be good.



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Default 06-26-2017, 05:34 PM

If boost is going over target then adjust dutybias in that range as needed. Simple stuff.

Any time you are tuning larger turbos you should disable the built in RPM FF gain so you can manually dial in duty bias. Note the default settings: http://www.n54tech.com/forums/showthread.php?t=33200


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nuttifriendivan nuttifriendivan is offline
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Default 06-26-2017, 09:30 PM

Quote:
Originally Posted by Terry @ BMS
If boost is going over target then adjust dutybias in that range as needed. Simple stuff.

Any time you are tuning larger turbos you should disable the built in RPM FF gain so you can manually dial in duty bias. Note the default settings: http://www.n54tech.com/forums/showthread.php?t=33200
I feel like we're ignoring the fact that even though 3rd gear is way off.. 4th gear is hitting target just fine.


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Sw4y1313 Sw4y1313 is offline
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Default 06-26-2017, 09:42 PM

Quote:
Originally Posted by Terry @ BMS
If boost is going over target then adjust dutybias in that range as needed. Simple stuff.

Any time you are tuning larger turbos you should disable the built in RPM FF gain so you can manually dial in duty bias. Note the default settings: http://www.n54tech.com/forums/showthread.php?t=33200
I did this when i first installed the turbos, its how i dialed in the duty bias in the first place. I also just did this on Todd H's(prelude) car this past weekend on his new RB Next Gens and his car did the exact same thing after dialing in duty bias and then unlocking FF again. His boost in upper rpms skyrocketed like crazy.

And as said above, 4th gear has no problems. I can post more 4th gear single gear logs and its dead on target. Go to 3rd gear, completely off.


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Default 06-27-2017, 12:29 AM

Are you saying that you enabled FF gain after you dialed in DB's? If so, you are suppose to keep the bit disabled, even after dialing in DB's.


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Default 06-27-2017, 01:49 PM

Quote:
Originally Posted by N54QC
Are you saying that you enabled FF gain after you dialed in DB's? If so, you are suppose to keep the bit disabled, even after dialing in DB's.
You sure? I don't recall Terry putting that information out


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Default 06-27-2017, 01:56 PM

I was in the car and reading the logs when this happened. Seemed like it was solely related to brake boosting. I highly doubt it's duty bias related as it was perfect before these brake boost runs.


'07 E90 MT Sports Package l FBO l RB Next Gen Plus l JB4 G5 with DPT E85 BEF l N20 MAP Sensor l MMP Inlets l RB Outlets l Custom Exhaust l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450 l Direct Port Meth Injection

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Default 06-27-2017, 05:46 PM

Quote:
Originally Posted by prelude2perfect
You sure? I don't recall Terry putting that information out
Yes, I have asked the question before because I was unsure at the time after installing my hybrids. Leave FF disabled even after dialing in DB's.


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Default 06-28-2017, 08:09 PM

Quote:
Originally Posted by N54QC
Yes, I have asked the question before because I was unsure at the time after installing my hybrids. Leave FF disabled even after dialing in DB's.
That contradicts what Terry says on post # 86 here: http://www.n54tech.com/forums/showth...t=29893&page=4


'07 E90 MT Sports Package l FBO l RB Next Gen Plus l JB4 G5 with DPT E85 BEF l N20 MAP Sensor l MMP Inlets l RB Outlets l Custom Exhaust l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450 l Direct Port Meth Injection

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Default 06-29-2017, 12:58 PM

Quote:
Originally Posted by prelude2perfect
That contradicts what Terry says on post # 86 here: http://www.n54tech.com/forums/showth...t=29893&page=4
I'd like to confirmation on this as well
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Default 06-29-2017, 01:12 PM

After finishing up duty bias wastegate adaption should be enabled again, unless there is some good reason you don't want to enable it.


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Default 06-29-2017, 01:32 PM

Quote:
Originally Posted by Terry @ BMS
After finishing up duty bias wastegate adaption should be enabled again, unless there is some good reason you don't want to enable it.
Well I apologize to those I may have told wrong, but are we talking FF rpm gain or wastegate adaptation?


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Sw4y1313 Sw4y1313 is offline
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Default 06-29-2017, 02:44 PM

So I have been doing duty bias tuning properly. And in my logs, it shows regardless of if I'm brake boosting or just rolling into the throttle, in 3rd gear, the JB4 is not holding target boost in the upper rpms. When target is 21psi, its hitting my boost failsafe of 27psi. But in 4th gear, it holds it perfectly.
My setup didn't change at all. I'm just not using meth currently because I can't get the new FSB to work.


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Default 06-29-2017, 09:47 PM

Quote:
Originally Posted by Sw4y1313
So I have been doing duty bias tuning properly. And in my logs, it shows regardless of if I'm brake boosting or just rolling into the throttle, in 3rd gear, the JB4 is not holding target boost in the upper rpms. When target is 21psi, its hitting my boost failsafe of 27psi. But in 4th gear, it holds it perfectly.
My setup didn't change at all. I'm just not using meth currently because I can't get the new FSB to work.
So it's happening without brake boosting now too huh? Very strange. I guess just adjust duty bias and see if it helps. Just strange because it was running great before that. When I drove it that one day it felt perfect


'07 E90 MT Sports Package l FBO l RB Next Gen Plus l JB4 G5 with DPT E85 BEF l N20 MAP Sensor l MMP Inlets l RB Outlets l Custom Exhaust l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450 l Direct Port Meth Injection

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Default 06-29-2017, 10:49 PM

Quote:
Originally Posted by prelude2perfect
So it's happening without brake boosting now too huh? Very strange. I guess just adjust duty bias and see if it helps. Just strange because it was running great before that. When I drove it that one day it felt perfect
That's what is frustrating me so much about this. I will mess with it this weekend.


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Default 07-01-2017, 02:02 AM

I reflashed back to previous firmware, made no changes to duty bias and here is the result. This was the first 3rd gear pull in map7 after changing firmware. Aside from having to massage duty bias again, she holds target, unlike on the newest firmware.
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File Type: csv 2017-07-01 00_44_45 (jb4).csv (10.3 KB, 95 views)


2008 E92 AW 335xi 6MT: VTT GC Turbos w/ Inlets n Outlet + JB4 + Custom BEF + BMS CP + BMS Meth kit & TwistedTuning DP Meth Plate + 6 Aquamist .4mm Nozzles & 350cc 7th nozzle.
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Default 07-01-2017, 12:41 PM

Quote:
Originally Posted by Sw4y1313
I reflashed back to previous firmware, made no changes to duty bias and here is the result. This was the first 3rd gear pull in map7 after changing firmware. Aside from having to massage duty bias again, she holds target, unlike on the newest firmware.
Very strange because I don't think Terry made any changes to this stuff on the recent firmware updates. I'd tag him, but don't remember how


'07 E90 MT Sports Package l FBO l RB Next Gen Plus l JB4 G5 with DPT E85 BEF l N20 MAP Sensor l MMP Inlets l RB Outlets l Custom Exhaust l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450 l Direct Port Meth Injection

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