with the fitting of the walbro 255 on the weekend my idle trims were still 0, so without a fuel pressure gauge I can assume its still fine. I only modified the in tank return pipe.
when I fitted a 450 to the gold ute idle trims went to town. but then again I ran bigger wires straight away, so you may be on the money with the lower voltage helping maintain idle pressure.
Im allways interested. hahahaha.
I recently found out one of my local workshops has a 4wd dyno now, so now im keen to put it on the rollers after some road tune action.