ltft vs. afr error
01-05-2009, 09:52 PM
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ltft vs. afr error i am new to tuning and am trying to tune my trans am with a tc76 front mount. im running 2 bar speed density.
i was wondering if anyone could tell me why my afr error and my long term fuel histograms read diffrent? i understand they are not the same thing, however afr error will read lean with like +5 or 6 in a cell and the and the long term fuel will read like -10 in the same cell, to the best of my understanding these should at least be both positive or negitive right? i must be missing something, can someone set me straight?
thanks
i was wondering if anyone could tell me why my afr error and my long term fuel histograms read diffrent? i understand they are not the same thing, however afr error will read lean with like +5 or 6 in a cell and the and the long term fuel will read like -10 in the same cell, to the best of my understanding these should at least be both positive or negitive right? i must be missing something, can someone set me straight?
thanks
01-06-2009, 09:40 AM
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Fuel trim is the -response- to error, should be equal
and opposite. But of course trims are roll-ups of
recent and older history and never agree in-the-
moment. Also trims are collected across wide "bins"
of RPM, MAP range adding to any pointwise mismatch.
If you ran steady-state long enough they ought to
agree fairly well, once history is paved over.
and opposite. But of course trims are roll-ups of
recent and older history and never agree in-the-
moment. Also trims are collected across wide "bins"
of RPM, MAP range adding to any pointwise mismatch.
If you ran steady-state long enough they ought to
agree fairly well, once history is paved over.