I'm wondering what you guys are holding for rail pressure. Seems like I remember my truck holding better rail pressure than it does now. I was at the dyno yesterday, and it couldn't hold rail pressure anywhere near what I know it has held previously. I was just curious what you guys are seeing. I was out testing a little today and saw around 25.5k psi with a 3000 uS pulse time. Does that sound okay? Does fuel temp negatively affect rail pressure? I ask because my truck was completely heat soaked yesterday.
Also, on my truck and a friends truck, once engine RPMs hit 3000 RPM rail pressure starts to plummet. While on the dyno yesterday, I was running a 3100 uS pulse that was holding a steady 24k psi until 3000 RPM where it started to steadily drop. By 3500 RPM it was down at 21k. My friend was holding 26k on a 2600 uS pulse (no lift pump). The same thing happened on his truck. It started to drop pressure at 3000 RPM and by 3500 it was a 21k. Both trucks are LBZs (well, mine's actually an 06 LLY but same difference). Anyone have any insight on this?
Also, on my truck and a friends truck, once engine RPMs hit 3000 RPM rail pressure starts to plummet. While on the dyno yesterday, I was running a 3100 uS pulse that was holding a steady 24k psi until 3000 RPM where it started to steadily drop. By 3500 RPM it was down at 21k. My friend was holding 26k on a 2600 uS pulse (no lift pump). The same thing happened on his truck. It started to drop pressure at 3000 RPM and by 3500 it was a 21k. Both trucks are LBZs (well, mine's actually an 06 LLY but same difference). Anyone have any insight on this?
