trying to learn lambda

[hrobb11507]

ok probably dumb question got everything set up to scan lambda for now I have commanded lambda at 1.0 across the board. I am beginning to try and tune ve and I think I can use the pre loaded lambda chart as long as my commanded stays at 1.0. what I am running into and would like to learn or figure out is the preloaded lambda chart will say .98 at idle and my commanded lambda I set up is reading 1.02. I know it is simple because its very close across the board if eq says 1.03 my lambda error will say .97 I know its simple and I don't like asking but any help is appreciated

[schpenxel]

Post your layout also

Also, I don't understand what you're asking.

Commanded lambda stays = 1 that entire log, which I don't necessarily think is a good thing unless you like being lean.

[hrobb11507]

here is my graph setup. I am no expert just tune on my own truck but everything I have read when ve tuning do I not want a commanded 1? I am commanding a 14.3 afr at 1 I had turned pe and dfco off because I had not figured out my commanded error so I didn't want those throwing off my numbers. I am no expert and please correct me if I am wrong but doing it the way I did I feel good about base ve I am lambda 1 or 14.2-14.4 across the board. I do want to figure out lambda error so I can make some scans and dial in my pe which seems to be real close now.
thanks for the help

[Codes]

For safety sake turn on your PE. You can setup a filter to filter that data.

For VE simply make a graph from your VE table X & Y axis. Log EQ Error Ratio under Maths --> Lambda & AFR, you could simply use your Lambda Error graph, just change the parameter to be logged and ensure X & Y axis for the graph are the same as your VE table. In that same graph setup a filter to filter out PE data, you can also take the filtering a lot further but you will need to read up on that.

[schpenxel]

here is my graph setup. I am no expert just tune on my own truck but everything I have read when ve tuning do I not want a commanded 1? I am commanding a 14.3 afr at 1 I had turned pe and dfco off because I had not figured out my commanded error so I didn't want those throwing off my numbers. I am no expert and please correct me if I am wrong but doing it the way I did I feel good about base ve I am lambda 1 or 14.2-14.4 across the board. I do want to figure out lambda error so I can make some scans and dial in my pe which seems to be real close now.
thanks for the help

No--the idea is to compare actual lambda from a WB vs. commanded lambda and correct accordingly. Making it just a flat 1 makes the math look easy, but HPTuners does the math for you so you're just running it too lean for nothing.

I added some stuff to your charts so that it has commanded lambda, wideband lambda and lambda error.

If you post your tune I can show you how to make a graph which is really what you need.

Test.Layout.xml