Scanner AFR Graph 2 cells not populating average while live, but visible after saved

[Garry W]

Please can you help. Attached is log. My AFR Error graph has blank cells in MAP 60-65 RPM 1200 for average when live logging. It does show last and count in these cells. After saving the file the cells are populated. There are plenty counts in those cells. This is a graph using user defined math parameters. Why would just these two cells remain blank (average) in live logging yet be populate in saved log? Scanner Version 5.0.4. with no update found.

afr test 02052024 log 1.hplafr graph avg visible in saved file.jpgafr graph count always visible.jpg

[blindsquirrel]

What in the world would you need the live data for that wouldn't be better served by using the data from those cells in the recorded log viewed in playback?

[LilSick]

the purpose of logging is to be able to go back in time and observe data after making a pass

good data is paramount

air fuel ratio is not good data

convert your set up to lambda and stop nit picking what scanner is doing while you are going down the track

if the data is available to be analyzed after making a pass - mission accomplished - the data was logged : )

[Garry W]

Blindsquirrel, I do use the recorded view for adapting my VE table. The point of the question is not what to use but why the live display is blank in those cells. It is nice to see the live view as well for quick live look at how close it is, especially sitting idling. Who really wants live data cells blank?

[Garry W]

LilSick, perhaps the graph and parameter title is missleading, the AFR Error math parameter I use is corrected for Alcohol composition (Stoich Ratio) and for commanded AFR, so effectively it is lambda error. I did this because I wasn't sure about the available "EQ Ratio Error (Math)". I can probably log both and use the latter if it's the same outcome?

[LilSick]

the AFR Error math parameter I use is corrected for Alcohol composition (Stoich Ratio)

pump gas stoich can vary even if the fuel contains no alcohol

race gas stoich varies too

c10 - 14.3
c16 - 14.7
c25 - 15.1

if you always run a certain blend of vp race gas you can use afr as the stoich is consistent from batch to batch

you just need to set the controller up for what you use

if you are running pump gas who knows what you are getting so it is better to use lambda

[Garry W]

Thanks for the response LilSick. "...pump gas stoich can vary even if the fuel contains no alcohol..." is new to me. So, as I understand it, Lambda is calculated from (AFR Actual)/(AFR Stoich). So, based on your comment, how do I know the AFR Stoich of the fuel I am using? Am I not supposed to use the composition table and my vehicles alcohol sensor? By the way, my vehicle is equipped with an Alcohol Sensor, so I read actual composition and use the composition table for stoic AFR.

But, back to my original question, which is vcm scanner is showing blanks for "average" for cells in live view but not showing blanks in saved offline view? Why? Not a deal breaker, just shouldn't do that I don't recall it doing that in the past (been using it for >5 years). Is it a new bug?

[LilSick]

saying the stoich of gasoline is 14.7:1 is like saying the barometric pressure at sea level is 29.92"

its just an average

ethanol has a lot simpler molecule and is almost always exactly 9.0

good luck with your gauges and warning lights and AFR