calculating acc finish rpm target.

when it comes to finding a rpm to finish your acc enrichment at, this be generally around 5,000rpm as i understand. does this point correlate to when you get max torque to get a exact target for your application? or is it just best to find out through observations of afr on throttle transition to see where it is no longer required.

What ECU are you running, and how is the accel enrichment calculated (what maps and settings are available) ?

The requirement for accel enrichment decreases with rpm but there isn't a single rpm that you can say is going to be effective in all engines. Test and see how your engine responds.