Custom AFR Error Math for histogram

[ProFire]

I am trying to write the math for afr error on a double stoich tune to set up a ve afr error histogram

Does it look right see photo

100x(AFR-command*.5)/(command*.5)

So first would be the afr command x 50% or .5 because command is double. next afr - your newly halved command. Then x 100 and Divided by halved command to get percentage.

[ProFire]

Here is the photo and file

20180612_202242.jpg
50% AFR ERROR.MathParameter.xml

[ProFire]

Should I post this in miscellaneous ?

[realcanuk]

I use the math parameter as it is in HPT and it works fine, but tuning in lambda.

[mowton]

Here are the two pieces of math needed if you are tuning in AFR..... Update your Chart, Graph and any filters using commanded AFR as required...

Another good reason to tune in Lambda

Ed M

[ProFire]

Here are the two pieces of math needed if you are tuning in AFR..... Update your Chart, Graph and any filters using commanded AFR as required...

Another good reason to tune in Lambda

Ed M

Thanks

[ProFire]

I use the math parameter as it is in HPT and it works fine, but tuning in lambda.

I do normally too but the pcm has a hard injector limit of 63 lbs and I have to do the double stoich method to get the new injectors to work. So when I am logging and read 14.7 afr or 1.0 lambda the commanded is 29.4 or 2.0. This makes the histogram read incorrectly.

[Lakegoat]

Did you half IFR and IVT Terms? Mine is double stoich and I have no trouble using Lambda. Using AFR would be a different story.

[ProFire]

Did you half IFR and IVT Terms? Mine is double stoich and I have no trouble using Lambda. Using AFR would be a different story.

Yes

[ProFire]

Did you half IFR and IVT Terms? Mine is double stoich and I have no trouble using Lambda. Using AFR would be a different story.

I should use lambda since i have a flex fuel sensor.

[07GTS]

I do normally too but the pcm has a hard injector limit of 63 lbs and I have to do the double stoich method to get the new injectors to work. So when I am logging and read 14.7 afr or 1.0 lambda the commanded is 29.4 or 2.0. This makes the histogram read incorrectly.

Lambda never changes if u double stoich the 29.4 is still lambda 1.0 thats why it works in all fuels, then just use eqratio v lambda for your error

[ProFire]

Lambda never changes if u double stoich the 29.4 is still lambda 1.0 thats why it works in all fuels, then just use eqratio v lambda for your error

Thanks I will try it out