ipp pressures

[zx_volcane]

Interesting.

Pump I've just destroyed had the solenoid, pump I've replaced it with just has a cap. Thought there was a difference in how the ipp was responding to throttle, but put it down to one being knackered.

Well it moves ipp vs spring+roller load.....roller load increases with injection load basically...if you try to imagine the more fuel its putting in,the harder the plunger is to rotate as its pushing on the camplate, meaning more ipp is needed to overcome it.

Makes sense, but still presume spring/shims are set up with this in mind and give correct advance under load?

Think what I'm trying to get at is this, you do a gov mod so you can fuel up at higher revs, then you extend the range of dynamic advance to take advantage of it, now I'm wondering if I need a higher ipp to trigger that advance at higher rpm or wherever stock set up will just continue to work beyond what it was originally set up for.

Bumping the ipp in my eyes is likely to just shift the starting point of where the advance piston begins and ultimately result in less range - or if its not a linear response, then it alters the curve and maybe you get more advance in quicker.