I run an FD OPR without shimming the relief valve in the front cover and I see a steady 100psi cruising down the highway @ 4k. I'll see 130-140 psi on cold startup. I would like it to be a little lower. I'm in the category or higher revs and higher torque though so while I need the pressure, I have too much. Then again, I felt that the stock Cosmo OPR was a little on the low side.
Don't forget though, that I modded my oil pump so my pressure is higher than most because of that o-ring in the pump.
My pressure also gets so high that I constantly blow out the front cover o-ring. I've tried gasket, no gasket, proper o-ring, bigger o-ring. Doesn't matter what I do, first oil-change after removing the front cover, I always... ALWAYS find the o-ring in the filter, yet I still get those pressures. I also cleaned and bored all the passageways in the front cover so I'm sure my pressure is dependant on a few of the mods that I've done.
Next time the oilpan is down, I plan on swapping OPRs.
Next engine I build, I plan on making the oil pressure adjustable externally, and bypassing the front cover all together, the original front cover outlet will actually become the return dump.
One of the reasons that I believe the REW OPR is set so high is becuase they are feeding 2 turbo's and need a slightly higher pressure to get more volume.
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Originally Posted by RETed
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REALLY? 
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