Quote:
Originally Posted by pete c
good point about the O2 sensors going nuts and making it run very rich.
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None of this would be possible without a fully programmable ECU checked by a wideband O2 sensor. It's a very (and I mean VERY) simple matter of tuning the engine to run stoichiometric, then to run on the stored fuel map during Economy mode (effectively ignoring the O2 sensor).
Lean burn would be almost as easy. Tell the ECU to center and "learn" at 18 or 19:1 AFR on a secondary fuel map, and tune spark to compensate. Map switching is possible based on throttle position, load, or RPM, whichever your preference.