Quote:
Originally Posted by KoolBRZ
Remember, it is far far better to make it leaned out in Closed loop, so it applies richer trims in Open loop. You can make up the fuel needed to accelerate with added Tip-in, and if you really need to accelerate, you'll be in Open loop anyway. I'm beginning to think that the entire closed loop should be Stoich. I'm going to try this out today. I left the temp comp tables alone, I still think they are necessary.
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Depends on what you are trading for. If it is FE then yes stoich or slightly lean will give you that but doing so you need to add some spark to bring combustion back to where it was set by the OEM.
Going slightly rich (very slightly) in the order of 0.95 lambda will give excellent drive feel but ofcourse at cost of FE.
OEMs tune the FAR to get best catalytic conv efficiency. So the FAR can vary from lean to rich depending on speed/load and this is engine specific so I cant tell you how it works for FA20.
Going CL too long can dip into Scavenging region and it can confuse the O2 sensors causing engine to run rich to compensate for it.