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-that makes sense. it would pulse greater than 50% to make it rich once it goes open loop?
Yes, the default setting is above 50% in open loop.
-can you look at it 2 ways, either the O2 leans out the open loop mode, or the open loop mode richens it for high RPM or higher load demands.(?)
No, the O2 sensor is ignored and does nothing in open loop mode.
Open loop mixture is determined by the FV duty cycle and the basic mixture setting. When you set the idle duty cycle in closed loop, you are only really effecting the open loop mixture. Idle and cruise are corrected in closed loop. In closed loop, higher duty cycle mean a lean basic mixture.
-so for those that dont use the O2, the only thing making it run richer for hi load demands is the shape of the funnel, which may not be enough unless it is overly rich at idle. (?)
This is only true when the ECU and FV are not working properly.
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Paul
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