Wideband and AFR Commanded issue in vcm scanner 3.2

[STR8BALLN]

How do I setup my scanner to read the correct AFR error if I doubled stoich for using the larger ID1000's injectors?

It has been presented to me that my AFR commanded will be off as well my AFX afr will be off. What can I do or how do I do it?

Would I need to transform the mpvi.1 ngk-afx and change those numbers???????

[STR8BALLN]

I just read some one said to set up a custom pid for (custom PID "True Commanded AFR" - Commanded AFR * .5) Not sure how to set this up in 3.2 channels? Since thay are called channels now vs pids.

Or should I set up a custom channel for: AFR commanded *.50= AFR commanded.

Then have the AFR error reference the custom channel?

[mowton]

Set up 2 math parameters-user defined.

1. Commanded AFR -- Air Fuel Commanded/2
2. AFR error -- 100*(WB rreading-(AF commanded/2)/(AF Commanded/2)

Attached are the two...add to charts and use error for graph.

Ed M

[STR8BALLN]

Ok Mowton, I am posting this up to see if I set it up correctly.

I went into the new variable wizard and selected afr commanded. Then input the math function.

math1.JPG

Is this correct?

[STR8BALLN]

I found the user defined math parameter tables.

AFR1.JPG

Now is this the proper way to set it up?

[DSteck]

Use lambda. Set stoich in your tune and forget about the concept of AFR.

[STR8BALLN]

Use lambda. Set stoich in your tune and forget about the concept of AFR.

I ended up setting up both Lambda and AFR. I just wanted to see how to set it up in AFR as well. Lambda was pretty straight forward as it had the predefined Eq ratio math already done. Thanks again.

[schpenxel]

You can set the widebandup as lambda then just change the units on the PID for your wideband to read AFR based on stoich of 14.7. Much much easier than trying to hack in a math parameter. You can do this anywhere... channels, graphs, charts, gauges.. it shows up just like any other unit (psi, kpa, etc.)

[STR8BALLN]

You can set the widebandup as lambda then just change the units on the PID for your wideband to read AFR based on stoich of 14.7. Much much easier than trying to hack in a math parameter. You can do this anywhere... channels, graphs, charts, gauges.. it shows up just like any other unit (psi, kpa, etc.)

Like this?

[07GTS]

i loop the WB input to 2 inputs so i use one for Lambda and other for AFR but honestly i pretty much only look at the Lambda now days

[schpenxel]

Like this?

Yes sir!

i loop the WB input to 2 inputs so i use one for Lambda and other for AFR but honestly i pretty much only look at the Lambda now days

You can right click on the channel for lambda and change it to AFR if you want.. not much reason to run it to 2 inputs anymore (at least, IMO). Can also set the units to AFR in graphs/gauges/charts if you want.. so you can get it all from lambda but not the other way around

[07GTS]

does it work with transforms still..? so i can just log lambda as i am but just use a maths to see AFR in the chart if u wanted to...

[schpenxel]

You don't need to do anything other than change the unit like is shown in the picture above. Use the same parameter you'd use if you wanted the chart to display lambda, then just change the unit to AFR 14.7 stoich and that's literally it. Super nice. Picture above shows what to change pretty well.

[07GTS]

ok yep that looks pretty easy, would be good if they can add a E85 stoich so it 9.7 instead of or as well as the 100% ethanol 9.0 i might msg support for a request

[schpenxel]

Yeah, that'd be nice.. I think they were trying not to make the list 100 options long so just stuck with some common ones, though I'd argue E85 is as common or more common than pure ethanol..

[DSteck]

Or just use lambda and move on with a much simpler life...

AFR is a really, really, really dumb thing to hold on to, honestly. Set it for what you're working with and forget about it.

[schpenxel]

Yeah, really no reason to use anything else. Takes a small amount of time to get used to it if you're stuck on AFR but isn't bad.

[07GTS]

i only do use Lambda but since going flex fuel i was wondering how close the stoich table is so when i get a EQ of 1.0 and my fuel is spot on but then i change ethanol % the EQ stays at 1.0 and if the fueling goes out ill need AFR to see what the stoich table is outputting so i can adjust that so my lambda 1.0 stays good at 0% to 85% ethanol, ive never used flex so i was wanting to visually see what it was on compared to any error when it changes, or is the stoich table pretty spot on for flex and shouldnt need touching..?

[DSteck]

You shouldn't adjust the stoich table. You'll get slight inconsistencies as ethanol content changes. If you do what you're saying you should do, you're going to chase your tail forever. Trust me.

[schpenxel]

Agreed. Use the factory stoich AFR table that runs from 14.7 to 9.whatever and leave it alone. Honestly it's been amazingly consistent for me, the only weird times have been during transition because I haven't bothered to setup the transition/delay volumes up any better