O2 sensor idea

[Ord Millar]

This is probably an often asked question, but here we go:

If I have an efi system using and air mass meter, and I can build myself a
table of injected volume / pulse width (by flow bench or other means), then
isn't it possible to calculate A/F pretty closely?  It might not be
instantaneous, but over the span of a half dozen or so intake events
wouldn't the average come out pretty close?


-----Original Message-----
From: CEIJR at aol.com <CEIJR at aol.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, April 20, 1999 2:29 PM
Subject: Re: O2 sensor idea


>Another $.02
>Assuming that changes in pulse duration result in linear changes in fuel
>delivery are OK for rough initial setup. As noted in prior posts, all sorts
>of other variables come into play. Unfortunately, in addition to VE
>differences, etc., the fuel flow is not exactly tied to pulse width, due to
>the variation in percentage of time spent opening and closing. So, it is a
>rough estimate for initial setup, but not good enough for tuning.
>
> Charlie Iliff
>
>