I've had to convert maps between 2.5bar and 3 bar every so often.

I spent some time getting the car pretty good at 2.5bar and just dreaded throwing it all away and going 3bar.

I did a crude "visual" correction but that was pretty far off.

So I used linear interpolation and extrapolation to get a good start at 3bar map for my car.

It seems to be pretty close.

The transition is wrong of course (negative slope) which I highlighted.

I'll give it a try but I was wondering if anyone tried this.

Also - if there is a math guy out that and wants a fun project a polynomial interpolation would be cool

I don't want to try to do this in excel ><