dynoiasi Posted February 2, 2021 Report Share Posted February 2, 2021 Hello, I'm sorry if the answer is already written in the help file or discussed on the forums before, but somehow I have not yet stumbled across the information. What happens when the input goes out of specified table bounds? Does the calculated output stay on the last prescribed value or is the output value calculated by extrapolating the gradient between the last 2 points? If we look at the example 2D table below, suppose the RPM goes to 400 which is outside the specified values in the table. What will the calculated enrichment output be in this case? 80 or 70? I would suppose the output will be 80 by extrapolation but I just want to make sure. Thank you! 100RPM 200RPM 300RPM enrichment whatever 50 60 70 Best regards, Florin Quote Link to comment Share on other sites More sharing options...
Vaughan Posted February 2, 2021 Report Share Posted February 2, 2021 if a value goes outside of a table the table output is the value in the cell on that edge (e.g. if you go off the right hand end it will update as you move up and down to the appropriate cell on the right hand end of the table. Another example would be if you go off the bottom right corner (off of both axes) it will take the bottom right most cell. Tables do not extrapolate outside of their bounds. In your example the output would be 70 for any engine speed greater than or equal to 300rpm. Linear calibrations do extrapolate linearly outside of their two specified points. Quote Link to comment Share on other sites More sharing options...
dynoiasi Posted February 3, 2021 Author Report Share Posted February 3, 2021 Thank you for the clarification! I'm really glad I asked this question because I somehow assumed that the output trend will continue by extrapolation because this seemed like the safer thing to do in the fuel table. On the other hand, it might not be so safe in the ignition table where you would increase timing towards higher rpm's if the table was "smaller" then the RPM... I guess I'll have to add another line to catch the boost cut value inside the table if the fuel does not extrapolate Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 3, 2021 Report Share Posted February 3, 2021 The injector PW will still be multiplied by MAP outside of the fuel table. So if you double the boost you will get double the fuel, even if the fuel table value doesnt change. Quote Link to comment Share on other sites More sharing options...
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