Originally Posted by mechatricity
That hesitation sounds related to CL/OL transition, you might have him double check the delay values.
I'm sure Mikey has that under control. tip in is a possibility, but I have a hard time believing he would be too far off on tip-in either. Both of those would show clearly in a log via the AFR.
BPV leak would potentially cause the timing wierdness. It's really tough to pin down, since you can make boost and the leak goes back to the intake, so it doesn't really show in AFR either, it just makes the turbo work harder and since we don't have IATs in the manifold, you're a little blind to it. Wouldn't cause hesitation though unless it was a constant small leak... which a BPV leak usually is not.