Since I've upgraded IC with FIMC AIRTEC I'm noticing decreasing LTFT (it's now -5,7% when it was 0% to +3,0% all the time before). It means that the fuel to air mixture is slightly too rich and ECU tries to compensate it. Is it normal?
If I measured it right O2 lambda sensor voltage is at higher levels on higher revs - on partial load (not on full boost). At idle it's fluctuating ok.
My guess is that AIRTEC IC can be in fact more restrictive than stock IC, so the air flow is more restricted = richer AF mixture = minus LTFT as an ECU answer for rich condition reading.
If not - what else could caused that minus LTFT? My car has 30 kkm on the clock and Oil Catch Can installed (to prevent valve carbon build up). K&N air filter is clean and spark plugs are new.
If I measured it right O2 lambda sensor voltage is at higher levels on higher revs - on partial load (not on full boost). At idle it's fluctuating ok.
My guess is that AIRTEC IC can be in fact more restrictive than stock IC, so the air flow is more restricted = richer AF mixture = minus LTFT as an ECU answer for rich condition reading.
If not - what else could caused that minus LTFT? My car has 30 kkm on the clock and Oil Catch Can installed (to prevent valve carbon build up). K&N air filter is clean and spark plugs are new.
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