A little bit of physics:
At a given engine speed and a given size of pump gears, the pump is trying to put out a fixed total amount of flow.
If you shim or change the pump spring to higher pressure and leave the viscosity alone, you'll get more flow to the engine and less over the relief valve.
If you leave the pump spring alone and switch to a higher viscosity oil, the higher pressure is because of higher resistance to flow thru the engine and you will have less flow to the engine and more flow dumping over the relief.
A few years ago, we were talking to the chief scientist at Valvoline and he mentioned that he was custom blending oil for some of the NHRA Pro Stock teams. I asked what viscosity it was and his response..."If I had to put a number to it, probably 0W-5."
Draw your own conclusions.
Eric
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