Hey guys. Ive searched through all the threads on this but every formula I try seems to be a little off so I thought I would ask everyone.

What formula do you use to log your wideband. I have it wired into the ecu. And am currently using a .3xxxx or .03xxx (cant remember off hand)timesx +9.7 formula. And its close but doesnt seem accurate enough.

Any thoughts woulf be great!

 

It won't be the same, but this is the formula I use and gets me within .1 of my serial logged afr: 0.03913*x+9.57

 

Can others post their formulas as well? I'm in the same boat with an AEM wideband failsafe and trying to get closer to the number on the display. I'm at just about sea level.

 

You can use a basic equation to solve this. Look at what the guage is showing at the same time log just the raw "x" value.

The formula you then need becomes the following:

x * (raw value of x) + 9.7 = <value gauge is showing>

Meaning that the scaling you need is simply:

x = (<value gauges is showing> - 9.7)/(raw value of x)

Once you have x enter it in the xml and log it for a bit on a drive around the area and see how accurate it is.

 

I am using .039137*x+10 on my car and 2 others. All have good grounding and have been wired into the ECU.