Transform help

[wstaab]

Need help with a transform. I have several laboratory grade non-linear (temp, egt, linear ride height) 0-5 volt inputs that worked fine in all previous version. Not suported in 3.xx! HPTuners tech support has been no help.
So trying to develope something close with no luck.
Oil temp sensor:
range
.522 volts dc = 60F
4.64 volts dc = 310f
tried volts/.016472 +60 and volts/.01642 +30
HpTuner log values are 30 to 50 degrees high compared to the actual guage.
Help!

[schpenxel]

Here's the math. Y = mx + b

Slope (m)
(310 - 60) / (4.64 - .522) --> 60.709 that's your slope (m)


Intercept (b)

y=mx+b

60 = 60.709 * .522 + b
b = 28.31

Put it all together:
y = 60.709 * x + 28.31

Test:
60.709 * 0.522 + 28.31 = 60
60.709 * 4.64 + 28.31 = 309.9

So, then you have to invert m to be in the right format for HPT

That will leave you with

y = x / 0.016472 + 28.31

So, looks like something else is going on then if you're already trying basically these formulas. Probably voltage offset issue or something like that

Instead of transforming the input, if you can get Voltage values at a few different temps then you can make a more accurate formula with that data vs. this one.

[wstaab]

This is the list from 2.24
STACK.jpg
This is the 3.xx channel cfg with the transform
2007Z06#10TRACK.Channels.xml
Log file
07 Z06 Log_NW102+_Katech-V6.6_VE5.1_LS9in_OL_TRACK_9-5-16.hpl