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I gave those #'s to Christian straight out of the 93 Ford Mustang Cobra cal for 24lB injectors. 0.49 was too much for my car (RICH), but 0.39 worked well.
I have my injector constant set at 29.75# .. and it seems to be right on with the BLM's. Every once in a while i'll get a 132 or a 122 or so. Other than that, the injector constant has worked very well.
If I'm not having problems with AFR, should I just leave it alone?