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afratioitem [2009/03/06 08:03]
twdorris
afratioitem [2009/03/06 08:03]
twdorris
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 ====== Estimated A/F ratio (AFRatioEst) ====== ====== Estimated A/F ratio (AFRatioEst) ======
  
-**NOTE:** This page is a little dated since the release of ECMLink (V3).  Much of this information is still accurate, of course, but the specifics of what you enter into the screens is different because this page assumes a V2 application.+**NOTE:** This page is a little dated since the release of ECMLink (V3).  Much of this information is still accurate, of course, but the specifics of what you enter into the screens is different because this page assumes a V2 application.  A better reference for the V3 application can be found in the AFRatioEst section of [[ecmlink101initialchecks|this page]].
  
 The A/F Ratio display item (AFRatioEst) causes more confusion than any other. ​ But it's really very simple. ​ It's basically taking __mass__ airflow data reported from the datalog and dividing it by __mass__ fuel flow data to arrive at an estimated A/F ratio. ​ To calculate __mass__ fuel flow, the display item uses injector pulsewidth data from the datalog and the true (more on this below) flowrate of your injectors along with the specific gravity of the fuel you're running. The A/F Ratio display item (AFRatioEst) causes more confusion than any other. ​ But it's really very simple. ​ It's basically taking __mass__ airflow data reported from the datalog and dividing it by __mass__ fuel flow data to arrive at an estimated A/F ratio. ​ To calculate __mass__ fuel flow, the display item uses injector pulsewidth data from the datalog and the true (more on this below) flowrate of your injectors along with the specific gravity of the fuel you're running.
afratioitem.txt ยท Last modified: 2009/09/10 05:16 by twdorris