[Diy_efi] WB O2 system

[Barry Tisdale]

At 09:46 PM 6/18/02 -0700, you wrote:
>On Fri, 14 Jun 2002 14:02:10 -0400, Barry Tisdale
><btisdale at cybersol.com> wrote:
>
> >AFR meter = FJO WB.
>
>OK, fine start.
............................................


Sheesh, more than I ever wanted to know......  Like I said, my prime focus 
here was getting a flat AFR curve over varying RPMs & loads.  Just threw 
the H2O/alky injection tidbit into the pot because I'd happened to record 
it - I haven't a clue as to what the numbers meant.

Ok, here's my latest brainstorm (looking for another project to fill my 
otherwise empty life...):  anybody looked into using the WB output to help 
maintain engine AFRs in, say, a 749 ECM?

Using the F31M table, "Base Pulse Inverse Air Temp vs. ADMAP" - scaled 
table to affect the VE as manifold temp changes - leans on heating, richens 
on cooling.  ECM impresses a roughly 5v signal on the MAT thermistor - 
resistance varies inversely as temp, i.e., lo resistance = hi temp, 
etc.  MAT sensor in the range 450-25k ohms.  Scaling this table 
appropriately, impress the voltage output, suitably conditioned, from the 
WB onto this in lieu of the MAT sensor - with suitable math & electrical 
engineering, should be able to get the engine to maintain a more or less 
fixed AFR - say, 12.5:1, sort of a poor man's FAST box.

Is this an old hat deal?  What think you all?

Thanks - Barry



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