Changing output of WB O2 setup (Autronic)

[Jurgen Hartwig]

Hi all, I could use any advice anyone can lend.

I bought an Autronic SMC engine management system.  It has the Autotune
feature (adjusts AFR based on input from WB controller).  The Autronic
requires 0-1V input.  There is only one solution, according to Autronic, and
that is their own Autronic controller (at cost over $1000US).  They say the
M&W controller is not a good match to the Autronic (AFR not stable).

FJO Inc, has what appears to be a very nice unit.  It is $636, with sensor
and display.  However, according to their engineer, their unit would not
work with my Autronic.  He tells me that 0-1 V and 4-5V on the analog output
is reserved for communications with their own ECU, and the AFR is shown from
1-4 V.

Now my question is this:  How can I filter, alter, or create a new signal to
reflect the ratio?  The FJO unit has serial output.  Is there any way I can
generate a voltage from the computer suitable for the ECU to read?  I mean,
the laptop will know the AFR.  Is it possible, without a lot of work, to
create a voltage on the 0-1V scale to be sent to my Autronic?

I have a feeling I need to just bite the bullet and pay the $1000, but if I
can save money, I will surely go for it.

Thanks
jay

PS> If any other Autronic owners have dealt with this, please let me know.



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