Opening Pressure & Injection Start: Understanding

Hi.

I believe it was donalexo who once installed 220-degree injectors in an engine that previously had 190-degree injectors. He reported that the injection timing shifted from the optimal center position to the later end of the adjustment range (I hope I'm remembering that correctly).

Does anyone have quantitative data (actual values, not just "early") on how worn-out nozzles that open prematurely affect the start of the injection process?

I'm actually wondering about the noticeably premature injection occurring at idle, while at the same time the earliest target values aren't being reached. I'd like to try to draw some conclusions from this (as to where it's coming from).

It also seems that the ASV (air-fuel mixture control valve) on my colleague's car adjusts the injection start much faster and more aggressively (which can be heard when starting the engine at idle) than the one on my 1Z.

Generally, my main goal here is to understand, rather than to create a direct exchange plan based on that understanding.

By default, my "1Z" is located exactly in the center.

m;