User defined input voltage resolution?

[burners]

I have this posted in the EIO section but nobody is responding.

I'm trying to setup a NGK WB that has a Holley controller. I have the voltage/AFR table from Holley and I put that into the "list" table in the configure user defined EIO window for my PID. The problem is that the table (and controller) needs a voltage resolution of 2 decimal places and it is non linear. Here is what I input:

0.73,10.000
1.13,11.000
1.34,11.500
1.53,12.000
1.73,12.500
1.88,13.000
2.06,13.500
2.29,14.250
2.35,14.500
2.42,14.750
2.45,15.00
2.54,15.500
2.57,16.000
2.72,17.000
2.82,18.000

Once I save it and then look at the table again HPT has changed it to a linear step table that looks like this:

0.7,10.000
0.8,10.250
0.9,10.500
1.0,10.750
1.1,11.000
1.2,11.250
1.3,11.500
1.4,11.750
1.5,12.000
1.6,12.250
1.7,12.500
1.8,13.000
1.9,13.250
2.0,13.500
2.1,13.875
2.2,14.250
2.3,14.500
2.4,15.000
2.5,16.000
2.6,16.500
2.7,17.000
2.8,18.000

So it completely messes with the output. Any idea on how to change the voltage resolution? Or do I need to go about this a different way?

[5_Liter_Eater]

How does it completely mess with the output? The curves look the same to me. You just lost some resolution and it doesn't look like much. You could plot the graph in Excel and use the voltage #'s that fall into one decimal place, just interpolate the AFR where the voltages end in one decimal place.

[burners]

The graph doesn't do a good job of displaying what is going on but the table certainly does. Here, I have put them side-by-side to show what is going on. It skews the entire table so that it reads inaccurately.
Holley------------- HPT
2.06,13.500 - 2.0,13.500
2.29,14.250 - 2.1,13.875
2.35,14.500 - 2.2,14.250
2.42,14.750 - 2.3,14.500
2.45,15.000 - 2.4,15.000
2.54,15.500 - 2.5,16.000
2.57,16.000 - 2.6,16.500

Notice that at 2.42 volts it should read 14.75 AFR but instead it reads something over 15 (about .25-.3 afr off) and by the time we are at 2.57 volts it will read about .4-.5 afr off. Not to mention that the difference between the Holley table between 15.5 afr and 16 afr is .03 volts yet HPT sets it at .05. The Holley table is non-linear and HPT turns it into a linear table.

[Bill@HPTuners]

The software automatically rounds them off, however if you want it to be accurate to the tenth you should be able to load the list to excel & then interpolate them to the tenth so you have an even more accurate table.

[burners]

Thanks for the response, Bill. Last night I started doing just what you suggested. The only problem I've encountered is the resolution in the area that I need gets a bit imprecise.
2.42,14.750
2.45,15.000
2.54,15.500
2.57,16.000
Notice that from 2.4 volts to 2.6 it jumps 2 AFR. The part that worries me is that the scale changes. Holley has the division of 2.42 to 2.45 volts (that is one scale) and then 2.45 to 2.54 volts is a different scale yet that spans just two data points from 2.4 to 2.5 (and one slope angle). It will be an approximation at best and it is right in the AFR needed the most.

[Bill@HPTuners]

Our software is intended for a 0-5v output not 0-3v which you will obviously loose resolution on just because of the lack of range.