I have read that Alpha N is used for naturally aspirated engines with low vacuum signals (less than 10 in). I have also read that throttle body choice is more critical with Alpha N. I would like to hear from those that have tuned high perf NA motors- do you prefer Alpha N or Speed Density for this type of application? What about sensitivity to throttle body size in Alpha N mode- have you seen this in your experience?
My engine runs less than 10 in of vacuum and while running the fuel table on my MS1, it idles in the upper left hand quadrant of the table. I can see that that is really going to restrict tuning points as I have eliminated about half of them. Is there any way to change the Y axis such that I am working in a smaller range of pressure on the Y axis or is Alpha N my best choice? This is a street driven BBC with a long duration cam.
My engine runs less than 10 in of vacuum and while running the fuel table on my MS1, it idles in the upper left hand quadrant of the table. I can see that that is really going to restrict tuning points as I have eliminated about half of them. Is there any way to change the Y axis such that I am working in a smaller range of pressure on the Y axis or is Alpha N my best choice? This is a street driven BBC with a long duration cam.
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