new $EE tuning thing!

[fbody_Brian]

if you're talking leaning it out at cruising speed or running AFRs different than 14.7:1 at anything but WOT, o2 spoofing and such is irrelevant, you'll need to run open loop. your narrowbands won't do anything. unless someone hacks it in, $EE doesn't really have the capability to run open loop just in certain zones of operation.

yep, comparing the wideband to the narrow band I came to realize quickly that the narrow band at anything other than stoich is worthless. I have a fairly lean cruise right now, but I'm running open loop full time. I have one narrow band still hooked up and I compare it sometimes to the wideband, but the computer doesn't use it.

i run full time open loop myself and i've deleted my narrowbands and their wiring. closed loop is fine for emissions and self healing, but open loop is certainly more versatile, unless you think engines have optimal performance running stoich outside of wot, which isn't really true.

It is my understanding that the whole reason that stoich is what it is and the reason the computer adjusts the way it does, bouncing between rich and lean around stoich is to keep the cats happy and working and make them last, not to make the engine happy. I have no cats so I don't see the point. My car runs great in open loop.

[steveo]

It is my understanding that the whole reason that stoich is what it is and the reason the computer adjusts the way it does, bouncing between rich and lean around stoich is to keep the cats happy and working and make them last, not to make the engine happy.

it's more than that, it's trying to guarantee reasonable emissions in general. an engine burning at stoich has fairly clean emissions, and the o2 sensors allow the system to be self-healing to a point (if there's a vacuum leak or something, the o2s can still force it to burn cleanly)

if emissions are a concern, keep it closed loop is a good idea