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miksebik miksebik is offline
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Default Boost reaching target fast but under target between 3000 and 4000rpm - 03-15-2019, 01:19 AM

Hi,
I had my car in a service. The front turbo was adjusted as the flap did not close properly. Now it seems OK, the boost builds very fast. But then I found that at map2, I stay under (1-2PSI) under target, between 3000 and 4000rpm.
I guess duty bias tunning will solve this?

flash: PUMP flash
map: 2

btw I know the log is not clean as I had problems with traction etc.. This is about the slight underboost in 3000-4000rpm range.

Thanks,
Mike
Attached Files
File Type: csv 2019-03-14 21_15_18_Map-2.csv (25.6 KB, 13 views)
File Type: csv 2019-03-14 21_15_46_Map-2.csv (18.8 KB, 13 views)


E92 335i N54, Hexon RR500, JB4, DCI, MMP inlets, ER chargepipe, Turbosmart Kompact Dual Port BOV, ATM IC, Wagner downp*pes, MPerformance exhaust, oil cooler, trebila flash (via MHD Flasher), E60, M Performance 370mm brakes, styling 313 wheels, M Performance suspension, Fuelit Stage2, MFactory LSD, MFactory SMWF
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miksebik miksebik is offline
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Default 03-15-2019, 01:41 AM

I noticed that ecu_psi differs from boost by 2PSI.. while the boost is 17, the ecu_psi is still around 15. That might be the clue?


E92 335i N54, Hexon RR500, JB4, DCI, MMP inlets, ER chargepipe, Turbosmart Kompact Dual Port BOV, ATM IC, Wagner downp*pes, MPerformance exhaust, oil cooler, trebila flash (via MHD Flasher), E60, M Performance 370mm brakes, styling 313 wheels, M Performance suspension, Fuelit Stage2, MFactory LSD, MFactory SMWF
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Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Default 03-15-2019, 10:52 PM

Quote:
Originally Posted by miksebik
I noticed that ecu_psi differs from boost by 2PSI.. while the boost is 17, the ecu_psi is still around 15. That might be the clue?
Raise your DB by 5 from 3k To 4K

Take 2-3 adaptation pulls & relog



http://www.fuel-it.biz/

e92 AT 335xi 2.0
Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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miksebik miksebik is offline
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Default 03-16-2019, 03:30 AM

Dave, I set FUD to 64 and decided to adjust duty bias in all rpms. Does it make sense? I think I am OK in the range up to 5000. Now I am under target above 5000rpm, I have to increase the duty bias there too.
Is it normal that I had to set DB=80 in certain rpms?
Attached Files
File Type: csv 2019-03-15 19_01_08_Map-2.csv (19.9 KB, 15 views)


E92 335i N54, Hexon RR500, JB4, DCI, MMP inlets, ER chargepipe, Turbosmart Kompact Dual Port BOV, ATM IC, Wagner downp*pes, MPerformance exhaust, oil cooler, trebila flash (via MHD Flasher), E60, M Performance 370mm brakes, styling 313 wheels, M Performance suspension, Fuelit Stage2, MFactory LSD, MFactory SMWF
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Default 03-17-2019, 07:57 AM

Quote:
Originally Posted by miksebik
Dave, I set FUD to 64 and decided to adjust duty bias in all rpms. Does it make sense? I think I am OK in the range up to 5000. Now I am under target above 5000rpm, I have to increase the duty bias there too.
Is it normal that I had to set DB=80 in certain rpms?
Where did you come up with those duty bias #s? Hah

You can manipulate the car however you wish. Generally I like to keep my duty bias adjustments small & close to one another to avoid a jagged boost curve.

Remember stock turbos arenít going to hold a ton of boost at redline and if they do you are working them hard & out of efficiency.



http://www.fuel-it.biz/

e92 AT 335xi 2.0
Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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miksebik miksebik is offline
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Default 03-17-2019, 02:27 PM

Well, I am raising the duty bias on my own in order to reach the target. OK, I will try to put them closer together but honestly, the car does not feel weird. Shrug.
With numbers around 70-80 the boost will likely reach the target. My turbos are not OEM, it is Hexon RR500 with slightly bigger wheels than OEM. It is weird that earlier, there was no need to tune the duty bias..


E92 335i N54, Hexon RR500, JB4, DCI, MMP inlets, ER chargepipe, Turbosmart Kompact Dual Port BOV, ATM IC, Wagner downp*pes, MPerformance exhaust, oil cooler, trebila flash (via MHD Flasher), E60, M Performance 370mm brakes, styling 313 wheels, M Performance suspension, Fuelit Stage2, MFactory LSD, MFactory SMWF
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Default 03-17-2019, 10:52 PM

Quote:
Originally Posted by miksebik
Well, I am raising the duty bias on my own in order to reach the target. OK, I will try to put them closer together but honestly, the car does not feel weird. Shrug.
With numbers around 70-80 the boost will likely reach the target. My turbos are not OEM, it is Hexon RR500 with slightly bigger wheels than OEM. It is weird that earlier, there was no need to tune the duty bias...
As stated prior- you can alter your DB settings however you wish, your car, you can tune it, raise the boost, lower the boost, go into the flash and alter tables- whatever you desire- we WONT stop you. What we will do however is give insight & suggestions based on seeing countless different setup over the years.

It seems like you got it under control, so I will bow out, best of luck & be safe



http://www.fuel-it.biz/

e92 AT 335xi 2.0
Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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