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Bad airflow?
I cannot get my wot tuned right. Im running 10psi more base fuel pressure with the n/t fpr on my rc 550's. That turns them into 640's, which I have the maft set for. My fuel trims were around 100% untill today when they all went lean for some reason, around 127%. I just installed a new walbro 190 and it's rewired, and I have a new fuel filter. My logger shows my idc is around 90% at ~5500 rpm on. Narrowband o2 voltage is at .89 volts, and the logger maxes out the 1606 hz airflow at ~4900 rpm. I'm still on the 14b at 17 psi. It's still knocking 10 or so counts even with adding 5 clicks with the maft wot knob. Thought it was rich knock so I backed it off 4 clicks, and knock went nuts. Also zero boost leaks. I've changed 2 gm mas sensors just to be sure, and I'm still having this problem. This has to be a bad maft right?I don't want to spend 150 on an afc unless I have to. There's no way in hell I'm maxing out 640's at 17psi with an unported 14b. Timing is right on at 5* btdc too.
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