TMO

I am trying to determine what this table is and how to use it. I have not touched this table thus far as I understand that it is enabled using an option flag. I could not determine which option flag is used to enable this table, so I want to determine if it is being used (the flag is probably obvious). And then understand when it should be used and if I should use it. I did a search but did not find anything. If it out there I apologize for the post. For what it is worth, I am grateful for all the comments from the super tuners. I find it unecessary to post because of the great information.

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RBob

That table along with another are used whenever the ECM is in open loop. Once in closed loop the stoich AFR value is used.

The ECM uses the commanded AFR as part of the injector pulse width (PW) calculation. The lower the commanded AFR, the larger the PW.

When in open loop the ECM uses the above mentioned table along with a CTS compensation table to create the commanded AFR.

RBob.

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TMO

So the reference in the documentation that says this is enabled via the option word flags is not applicable. That is this table is always used when in open loop? As I said, I have not worked with this table thus far and I am trying to tune my AE. There are numerous posts on that and it appears to be somewhat trial and error. If indeed this table is always used I need to learn how it is used relative to the other paramters. I reduced the AE pulse and it is helping with the 0 to 2000 rpm range, where I have not a bog, just pokey performance. I learned the VE tables using a WB prior to this adjustment and did not see the bathtub shape that would suggest too much AE. Again, most of this is posted and I can review those posts. I have not run accross any posts regarding this table, but I will search again. For now, I simply need confirmation that this table is indeed used at all times in OL and is not enabled/diabled with an option word. That is, it needs to be taken into account and AE tuning is not limited to adjusting pulse widths.

RBob

The AFR table(s) are only used in open loop. However, open loop on a stock tune doesn't last long. Ii will go into closed loop as soon as the engine warms up and the O2 sensor heats up.

The option flags you are referring to force open loop. So when they are used the ECM will go to open loop for that state. And then always use the AFR table when in in open loop.

Note that the AFR table names are preceded by "Open Loop - ". And in the documentation the word "also" is used when mentioning the available open loop modes.

RBob.

TMO

Thanks for your answer and patience. The obvious answer is why I try not to waste folks time. Again, thanks.