X-Mozilla-Keys:                                                                                 
Brian D. Cain wrote:

Paul and everyone else, can I ask you guys a question?

On our Rx7 list I'm on, we often talk about fuel modifications
and air/fuel ratios, etc.  Most people that I talk with use an
air to fuel ratio meter that's basically made around a store
bought single-wire or 2 or 3-wire O2 sensor; you know, the
cheap $25 jobbers you can snag at Autozone on a good day,
for measuring their after-the-fact air to fuel ratios on their
turbo 13B's.

I just realized something about this.  Even though
I don't quite trust these things to save my life (would you
trust hundreds of horsepower and the life of your engine to
a $25 O2 sensor?), is it *really* and truly accurate to measure
intake charge mixture ratios based off of the oxygen content
in the exhaust stream?  As far as I can tell, there's no way to
measure them on the intake side which would make the most
sense.  That gauge that I use, by the way, is literally nothing
more than a gross "hey there's a fuel delivery problem"
measurement as well as a pretty lightshow for the cockpit.

This is puzzling me.

B

 
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