Fly Posted February 27, 2014 Share Posted February 27, 2014 Evening all. I've had myself reading most of the day, on different sites about tuning. Anyway I've been looking into the different ways of how you develop a tune on your ecu by way of speed density (map sensor input for the laymen) or alpha n (TPS vs engine speed). I started looking over my emanage software and trying to build my understanding of the various maps, what they do, what options etc. I was looking over the injector maps and the drop down menus, you can select TPS,airflow pressure, greddy pressure sensor, relative pressure and absolute. So from what I was reading today and my limited understanding can someone confirm the scale and graph I am looking at here is effectively alpha n. Image below. The only benefits I see of using one over the other are when a small throttle change creates a huge air volume change that would cause the map sensor a head ache, such as itbs, so setting a duty cycle value against small throttle positions enables you to rough out a map without the map sensor? Another thing I've just thought of is the greddy pressure sensor selection shows volts against engine speed, how do you convert this to a known pressure ? Thanks again Quote Link to comment Share on other sites More sharing options...
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