NefMoto > Technical > Tuning > Boost before fmic + k04 hybrid stage2
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Author Topic: Boost before fmic + k04 hybrid stage2  (Read 4860 times)
Dejw0089
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« Reply #15 on: July 17, 2025, 08:26:40 AM »
Thanks guys for any advice and I read and check how n75 work and now I know if i let boost presure goes straight to WG then it opens when spring cant hold WG closed anymore.

But i have weird behavior in high rpms and its totally make blow my mind. Have few logs and can give me a feedback why i have opposite behavior?
I have brand new pierburg N75 and still same things happen
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Dejw0089
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« Reply #16 on: July 17, 2025, 08:40:18 AM »
Quote from: Dejw0089 on July 17, 2025, 08:26:40 AM
Thanks guys for any advice and I read and check how n75 work and now I know if i let boost presure goes straight to WG then it opens when spring cant hold WG closed anymore.

But i have weird behavior in high rpms and its totally make blow my mind. Have few logs and can give me a feedback why i have opposite behavior?
I have brand new pierburg N75 and still same things happen.
Sorry something went wrong and no attachment add.
As you see if I have more WG %DC i have pressure lost on high rpms and 0DC.csv file have locked DC to 0 on high rpms but boost goes high and low and again high.
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aef
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« Reply #17 on: July 18, 2025, 12:31:50 AM »
Tell us something about your Intake System. Looks like something is collapsing.

You can reduce boost up top. 1,5bar at redline with a small k04 ?!
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Dejw0089
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« Reply #18 on: July 22, 2025, 11:16:09 PM »
Quote from: aef on July 18, 2025, 12:31:50 AM
Tell us something about your Intake System. Looks like something is collapsing.

You can reduce boost up top. 1,5bar at redline with a small k04 ?!
Intake system is build with 2.5" aluminium pipes connected with silicones.
TIP is silicone.
Now i make short connection on n75 line (bypas n75) and make linear boost from 3k to 7k i have 0.5bar and goes up to 1.2 bar (no oscilations)
So why with n75 pluged in with 0 DC have weird oscilations everytime on same rpms (6000) and when N75 have 85DC have 0.4 bar over 5k
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aef
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« Reply #19 on: July 23, 2025, 12:45:50 AM »
As i said there are three possibilities
your tip is collapsing and blocking the whole intale
or your wastegate is pushed open because of too much exhaust gas
or your system is leaky because engine is moving too much on high load

set CWMDAPP to 10 and KFLDRAPP to 0 on wot and log
then set it to 10% fixed duty and log
then set it to 20% fixed duty and log
....
set it to 95% and log...

this might help you to find the problem(s)
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