DIY_EFI Digest V4 #680

[Gary Derian]

> So do the EGO sensors work at stoich because they were designed to work at
> this ratio, or is there something intrinsic about their operation and the
> conditions at stoich that causes this?

EGO sensors output when there is oxygen only on one side (rich) and have no
output when there is oxygen on both sides (lean)  This characteristic is
intrinsic.  A 3 way cat also works best right at this point.  Engine design
and tuning is optimized to make the cats work well.  Without cats, lean for
cruise and rich for power would be the way to go.

Gary Derian <gderian at oh.verio.com>