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Kolbe Kolbe is offline
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Posts: 38
Join Date: Mar 2017
Car: BMW F10 M5
Default Please evaluate: Duty bias - S63TU with JB4+BCM with BM3 Stage 2, 91 octane BEF - 10-05-2018, 08:46 PM

I have done about 7 runs on Map2 for FF to adapt. Last log is attached. FF has crept up towards PWM in the lower rpm range but not in the higher rpm range where boost is not hitting target. PWM is around 63%.
I then changed the duty bias from 50,50,50,50,50 to 50,55,60,65,65 in the range 5000 to 7000rpm. Log is attached. PWM now goes up to 86% at peak rpm but boost remains roughly the same as before at high rpm. Should I try something else (PID?, FF?) to bring up the boost at high rpm or are the stock turbos just not able to hold their boost at high rpm (I'm at 5000ft and using 91octane)?
Attached Files
File Type: csv 2018-10-04 09_31_20 map2 .csv (15.1 KB, 94 views)
File Type: csv 2018-10-04 13_42_55 map2 duty bias mod M2.csv (11.4 KB, 90 views)
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