Histograms

[TXBLOWNTBSS]

Does anyone have a config setup with histograms to read AFR error? Possibly GMVE vs afr error? trying to dial in my VVE on a E38 with a 231-239 112 LSA cam. My LM1 reads in my table and chart display (in the table display it only reads on the bottom where I had to add the EIO input. I tried adding it to the main area of the table display and it wont pop up under user defined. Surely im looking past something. AFR error is there but not the AFR. Attached below is my config. any pointers would be greatly appreciated.

[schpenxel]

Can't tell much of anything with that config file. Custom PID's don't get saved in that file.

Yes, everyone on this forum pretty much has an AFR or lambda error PID setup.

It's not very complicated. Create a user defined PID that is whatever your wideband input is [aux.something] divided by commanded lambda or AFR (depends on which unit your wideband is logging in. If you want is to read in a unit similar to fuel trims, then use something like ((([AUX.20121]/[USER.9004]])))*100-100 where aux.20121 is my wideband, user.9004 is commanded lambda

That's it.

Make sure whatever commanded lambda or AFR PID you just used is in the table display, and there you go. AFR/lambda error PID is now usable.

Post a screenshot of the screen where you're filling in the formula for the user defined PID

[justhereforinfo]

"It's not very complicated", once someone has shown you how to do it..... I've been through all the help files, searched this entire site, and ls1tech.com for the past three days and I'm still chasing my tail. Slowly picking up bits and pieces though.

My wideband is coming in on AUX.20121. So I open histogram settings, choose #7 (VE-AFR ERROR), click on PID, then Custom User Defined, select #4 (undefined), add Commanded AFR??!

Damn it would be nice if I could see a screen shot of your formula and where it is entered.

[justhereforinfo]

and my "Commanded EQ Ratio" is PID.68. So I would use [AUX.20121]/[PID.68]*100-100? I dont know what *100-100 represents. And where would I input this equation?

[justhereforinfo]

Actually, I should be using Air Fuel Ratio Commanded Hi Res, which is PID.6001

I can see the error % of around 3% populating in the #7 histo window, but its only in one box. There is only one row/column, so that isnt helpful. lol. hmm

now i have this string in my custom user defined parameter [AUX.20121]/[PID.6001] , but still no good.

[Crawler]

This is for a 2015 Silverado, so you will need to adjust for your needs. Do you have your labels filled out for your X and Y axis'?

[schpenxel]

Actually, I should be using Air Fuel Ratio Commanded Hi Res, which is PID.6001

I can see the error % of around 3% populating in the #7 histo window, but its only in one box. There is only one row/column, so that isnt helpful. lol. hmm

now i have this string in my custom user defined parameter [AUX.20121]/[PID.6001] , but still no good.

Define "no good". What is it doing? What values is it showing?

Start with the wideband reading (in AFR) divided by commanded AFR. That will give you a correction factor. 1.1 for example would mean you're 10% lean (multiply that cell of MAF or VE table by 1.1 to correct it)

0.8 would mean 20% rich, so MAF/VE cell would need to be decreased by 20% (current value x 0.8)

The value in doing *100-100 is to make these wideband AFR values show up like fuel trims are typically shown.

With that formula then if you get, say +10%, then it's 10% lean and you need to increase the VE/MAF table on that cell by 10%

-20% would be 20% rich, need to decrease VE/MAF cell by 20%.

Post screenshots of what you've got and what you're getting. It really is simple after you get it once.