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PrzeChuj PrzeChuj is offline
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Default 08-05-2017, 07:02 AM

Terry this may be a stupid question. But does adjusting FF and duty bias only change it for current map or are the changes happening across the whole map selection? If I'm running map 2 with bef and decided to throw in a higher ethanol mixture and run map seven would I have to fine tune it also? And if so when I go back to map 2 are my changes saved?


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Default 08-05-2017, 09:00 AM

Quote:
Originally Posted by PrzeChuj
Terry this may be a stupid question. But does adjusting FF and duty bias only change it for current map or are the changes happening across the whole map selection? If I'm running map 2 with bef and decided to throw in a higher ethanol mixture and run map seven would I have to fine tune it also? And if so when I go back to map 2 are my changes saved?
For twin turbo N54 firmware the dutybias settings are global for all maps. Once the curve is set properly it should scale properly across all plausible boost profiles.


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PrzeChuj PrzeChuj is offline
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Default 08-05-2017, 09:36 AM

That makes life alot easier once the curve is set. Love the bms product line and support you guys are unmatched in the tuning world. Would u recommend me setting my curve and then finishing my meth system and set it up after words or before ?


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Default 08-05-2017, 12:35 PM

I'd dial it in close to what you expect to run for a boost profile most of the time.


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zort zort is offline
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Default 08-05-2017, 03:55 PM

Quote:
Originally Posted by Terry @ BMS
For twin turbo N54 firmware the dutybias settings are global for all maps. Once the curve is set properly it should scale properly across all plausible boost profiles.
This is good info.
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orteeze orteeze is offline
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Default 09-13-2017, 01:56 PM

In regards to the N55 DB Tuning on a PS2, if I disabled FF and my boost target is fairly close, but there is still some separation between FF and PWM; do I continue raising FF? Wouldn't that throw me over target?


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Default 09-13-2017, 03:38 PM

It's a pneumatic system so you just want FF in the ballpark. The PID will drive boost to target as long as its ranged closely. Once done FF learning should be on to account seasonal changes and WG wear and tear.


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Default 09-15-2017, 11:27 AM

Quote:
Originally Posted by Terry @ BMS
It's a pneumatic system so you just want FF in the ballpark. The PID will drive boost to target as long as its ranged closely. Once done FF learning should be on to account seasonal changes and WG wear and tear.
What are the risks of leaving FF learning off? I've found that if I am tuning with strictly 2500-6500 pulls, FF will optimize to that, but then if I'm driving around and decide to do drop 2 gears and blast off from 4K, the FF then starts to learn down (due to overboosting), if I do that enough, it makes going back to tuning 2500-6500 slow because it needs to learn back up. It makes my car feel inconsistent due to my most recent driving style.

At the moment, I've turned FF learning off and have found a decent setting for 2500-6500 tuning. This setting also has minimal overboost (that I've seen) when blasting off from 4K. I'm less worried about the overboost as my current setup doesn't seem to be affected by it. That being said, I'm pretty neurotic about my logs and evaluate almost every one.

Are there other risks that I may not be thinking about? Any suggestions on other solutions to this issue?


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inevitab1e inevitab1e is offline
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Default 10-29-2017, 05:28 PM

What is the maximum DB value that can be entered by RPM? 50-100 range?


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Default 10-29-2017, 05:36 PM

0-100 range.


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Default 10-29-2017, 05:37 PM

Quote:
Originally Posted by tho
What are the risks of leaving FF learning off? I've found that if I am tuning with strictly 2500-6500 pulls, FF will optimize to that, but then if I'm driving around and decide to do drop 2 gears and blast off from 4K, the FF then starts to learn down (due to overboosting), if I do that enough, it makes going back to tuning 2500-6500 slow because it needs to learn back up. It makes my car feel inconsistent due to my most recent driving style.
The problem with leaving FF learning off is weather and barometric pressure changes can have larger differences than you'd think on required WGDC, so by locking it, you prevent the system from being able to slowly adapt. Think of the FF learning as a really flow I factor.


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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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(#112)
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Constantine Constantine is offline
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Default Help with FF & Duty Bias Tuning - 11-10-2017, 02:02 PM

Hi guys,

My N54 335i seems to be cutting power from time to time and the JB4 goes to map 4 with a too lean condition. Changed spark-plugs, coils, low fuel pressure sensor as well as one of the O2 sensors that was giving me trouble (bank2).

I am attaching a jb4 log. I would appreciate any knowledgeable forum member's help / comments on the following:

1. My boost is below target for while - turbos taking too long to spool?
2. My AFR and AFR2 go over 15 for a bit, and that's when the car cuts power.
3. E85 of 66? What does that mean? I am running pump gas, usually 94 octane without ethanol or 91 with 10% ethanol - that's all I can get in Vancouver, BC, our one E85 station closed down.
4. Does my WDGC dropp from 99 to 25 too early while boost is 4 psi below target? If so, how do I change that? Run map 6 with what kind of parameters?

PS. I have ******* ***, stock trubos with the dreaded wastegate rattle (unless I keep the Default Wastegate Position under 27).

I would appreciate any help.
Attached Files
File Type: csv JB4 log 2017-11-08 Map 2 Issues.csv (4.8 KB, 7 views)
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Default 11-10-2017, 02:04 PM

Not a WGDC tuning issue. Your fuel trims show you're dropping to open loop mode. Probably need to target less boost OR add in a back end flash map.


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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Constantine Constantine is offline
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Default 11-10-2017, 03:07 PM

Thanks Terry for the quick response!

I'll try to add a back end flash map - what would you recommend? I don't have easy access to e85, I can get 94 octane gas without ethanol or 91 with 10% ethanol. Which fuel and what back end flash map?

Also, what does a value of 66 for e85 in the log mean?
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Default 11-10-2017, 03:23 PM

Load the PUMP BEF.

The E85 reading means nothing unless you've configured the virtual flex fuel sensor or have a hard wire sensor installed.


Burger Motorsports
Home of the Worlds fastest N20s, N54s, N55s, S55s, N63s, and S63s!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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yellowfin yellowfin is offline
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Default 11-11-2017, 10:40 PM

Quote:
Originally Posted by tho
What are the risks of leaving FF learning off? I've found that if I am tuning with strictly 2500-6500 pulls, FF will optimize to that, but then if I'm driving around and decide to do drop 2 gears and blast off from 4K, the FF then starts to learn down (due to overboosting), if I do that enough, it makes going back to tuning 2500-6500 slow because it needs to learn back up. It makes my car feel inconsistent due to my most recent driving style.
I have a similar experience. On the track, FF learning would probably be great, but under DD conditions, different story. I spend so much time in traffic in the low-load 1000-3000 rpm range, during which FF leaning can go anywhere. Then every once in a while, when I get to punch it, FF may not be where it should be. So, I have fixed FF and rely on the 30% PID gain (which is probably mostly P, maybe little bit of D, but no I)

Are there any details available on FF learning (if it's not proprietary information)? Length of time integral? Min load for learning? Does it learn in spool mode? (Should not, because it's underboost by definition)


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Last edited by yellowfin; 11-11-2017 at 10:46 PM..
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