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Wideband Lambda

By nelmo
May 14, 2018 in Engine

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Wheely good builder!

alanrichey

Posted May 17, 2018

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Posted May 17, 2018

Might be different, as the Superspec uses a narrow-band sensor, but I regularly see +/- 10% fuel corrections on mine.

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Wheely good builder!

brumster

Posted May 17, 2018

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Posted May 17, 2018 (edited)

I would think since a narrowband is so limited in what it can tell the ECU, the ECU has to make pretty wild jumps either side of stoichiometric to "test the water" and figure out how much it needs to adjust by... it's a bit of a guessing game for the ECU, I believe, with narrowbands (fine for steady-state basic emmissions adjustment though)...

Edited May 17, 2018 by brumster

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Wheely good builder!

alanrichey

Posted May 17, 2018

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Posted May 17, 2018

Yes, it is very crude, a real bang-bang system. Here is a plot of fuel trim adjustment on a recent trip (engine was stopped in the middle)

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