Hey guys,

I'm almost completely dialed in. I have a small surge under light acceleration. After much reading, searching, and data logs. I'm almost certain I need to tighten up my proportional gain.

I can't find a thread where this is discussed using $6E. People constantly talk about the Prop gain vs airflow table which I do not have. Any suggestions on which of these tables I need to adjust?

Thanks!

 

When tuning proportional gains I use the NB O2 signal and the INT for input. With the INT, see if it is oscillating. A rapid rise and fall is from too much prop gain or duration. This is where the INT is chasing the gains to correct the over/under fueling.

While a slow rise and fall is from not enough prop gain or duration. In this case the ECM is using the INT to create cross counts.

As for which table to use, I don't particularly like the gain/duration versus O2 error. Too easy to cause over/under shoots as the O2 is going to go to those extremes. But in your case need to use it for the gains as there isn't any other gain tables.

The RPM vs duration is similar to an airflow table as the RPM increases so will the airflow.

RBob.

 

Thank you for your reply. As usual, your a huge help again. How would I go about adjusting that Proportional Step Duration Vs. Error table. Maybe start by reducing each cell by 5%?

 

If the gains are a little too high, then reducing it in small steps is best. It is easy to over or under shoot the gains when they are close to being correct.

RBob.