Jack:
We (my Automotive Electronics Consulting firm) just built such a device for a
client. We used a NGK UEGO sensor and interface, and then built a display
that would read out the A/F ratio from about 8.0 to 22.0 or so, with a fast,
real-time response. It ended up costing several thousand dollars, but was
still less than buying one of the commercial units. We have considered
producing a low priced commercial unit (around $2,000), but haven't decided
if there's really a market for it or not.
Commercial units are available from Bosch and another company (on the road
today and don't have my files with me on this subject...I'll look it up when
I get back). These units are priced in the $5K price range +/- and readout
A/F ratio, and other data.
A true A/F meter, which responds quickly is a useful tool in doing engine
development and analyzing problems in individual cylinders.
Myles H. Kitchen
1965 Lotus Cortina Mk1 #128
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