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Author Topic: Closed loop lambdacontrol go static at high rpm WOT  (Read 3071 times)
curamrdan
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« on: February 19, 2019, 11:55:35 AM »

Hello, what causing this. Lambda control goes static(not off) at certain RPM point(6000rpm) at wot. Enclosing two developing logs, one si low boost(0.8bar+creep) and second is high boost (1.7bar). Car is bigturbo 1.8t with mafless hack. Or is it due actual lambda is close enought target?
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woj
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« Reply #1 on: February 19, 2019, 02:11:25 PM »

So how would you say lambda control "going off" should manifest itself in your logs?
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curamrdan
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« Reply #2 on: February 19, 2019, 04:24:37 PM »

So how would you say lambda control "going off" should manifest itself in your logs?

You can see, lambdacontrol trace freezes since 6000rpm. In first example it freze at 0, in second freezes at +8%.

I dont know if its just loose of precision in logging or some issue, factory settings.
« Last Edit: February 19, 2019, 04:26:24 PM by curamrdan » Logged
nyet
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« Reply #3 on: February 19, 2019, 11:07:51 PM »

Who did your mafless hack? How was it done? Is it possible that problems are causing lambda control to turn off?

Without know specifically how the mafless hack was implemented, it will be impossible to debug any fueling problems you see.
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spacey3
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« Reply #4 on: February 20, 2019, 02:18:20 AM »

What lambda are you requesting? Can't quite see from screenshots... Post your logs and file (if not commercial).
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prj
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« Reply #5 on: February 20, 2019, 03:21:10 AM »

Lambda control gets frozen when BTS is active to prevent engine meltdown by faulty sensor.
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curamrdan
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« Reply #6 on: February 20, 2019, 03:30:30 AM »

Ah, yes, i just check when spacey3 ask about AFR request. Confirming, that it happends on BTS activation. Thank you guys.
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nyet
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« Reply #7 on: February 20, 2019, 08:58:19 AM »

Lambda control gets frozen when BTS is active to prevent engine meltdown by faulty sensor.

Thanks.
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
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Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
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