I was wondering if anyone else might know a little more on this subject.
I'm working on a pretty neat spread sheet to convert ford data into GM data. It does so by best fitting the pressure and voltage modifiers to breakpoint, offset, hi and low slope into 1st, 2nd, or 3rd order polynomials with best r^2.
The whole sheet is pretty dynamic. Nothing comes from the square root of the pressure difference or a linear interpolation or extrapolation (unless it fits a 1st order equation best)
I'll be frank, where I'm at now looks pretty good.. but it differs from published sheets that do the same thing. I'm at a point where i don't know if I'm doing a better job, they are doing a better job, or maybe we are both off!
I'm going off these assumptions.. am I right or wrong?
The GM definition of offset is where the dynamic injector flow rate (meaning changing with pressure/voltage) intercepts the x axis
The Ford definition of offset is the point at which the low slope line intercepts the X axis which can be found by finding the dynamic breakpoints, the dynamic low slope, finding the low slope equation for a line and setting Y = 0.
I've drawn a simple graph in paint to illustrate my assumptions.