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Calibration impulses per liter should be set to 169 not 159. Hope this helps, Other ideas to increase flow would be to reduce or eliminate 90's [use45's if possible], consider adding a second d5 in a dual top if flow is still to low for your liking. This would also give you redundancy if one pump fails.
From what I was told in other forums as well I should expect close to or even over 1GPM!That seems like a pretty low flow number. I haven't hooked any D5's to a flow sensor though, I'm using a MCP35x.
I have all 7/16" ID tubing, guessing 4-5 foot
2xUT60 480mm rads in pedestal (hence the amount of tubing)
cpu block
2xgpu blocks
6x 45's & 3x90"s & 1x5 way "snake" (all rotaries except the drain line)
169 calibration setting for the high flow sensor
my max flow is around 1.2-1.3 gpm.
Just based on past experience with D5's I would think you would get more than 0.4gpm. But that is only a guess. Can you beg, borrow or steal another D5 and stick in the loop and see what 2xD5's does?
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