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I also understand psi but apparently most things make more sense in kpa oil pressure being one of a few exceptions so im trying to learn ahahahah, I have no idea of the relief spring pressure tbh I thought 110 which is the absolute peak it hits was about right, I was thinking of removing the relief and making sure it is in good condition, I would just replace it but couldn't find a replacement for an n1 pump too easily but I could just be blind. -
It certainly does make sense that there is just no oil to pick up, but I can go 3 or 4 gears of WOT and have no oil pressure issues too (I have no logs of this unfortunately) and I have a fair amount of oiling mods to try and help only thing I'm missing is a rear head drain which is potentially the most helpful.
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speaking of the relief spring and noting this is one of those stupid times where I understand imperial (psi) but the graph is in metric (kpa), it looks like the oil pressure is a little low at full noise too, isn't the relief spring 120psi/830kpa? -
No. All these dirty old Datsuns are shitboxes. Including the GTR. -
Yeah well I was thinking...there is nothing that happens when you get off the throttle that should cause low oil pressure, its not like clearances suddenly change or and the relief spring would close and in any case the sensor is on the feed side....so more likely there was no oil available to pick up which means all the basic oil control stuff to: 1. keep oil out of the head (restrictors) 2. get it back out of the head when it gets there (external breathers/oil return, drilling out the block and head oil returns) 3. have more oil in the sump to pick up - larger capacity sump 4. have more oil near the pick up - baffles
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