Thread: Lesson learned: oil pressure vs flow

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I'm working from two beliefs based on what I think I read in your post. One is that the pressure drop occurs on the gauge that's connected to the engine rather than the remote filter mount (trying to keep up with what's first and what's second). Second, though not mentioned, is that when you drop rpm below 4500 again the pressure reading returns to the 45-50 from the 30-35.

Dropping oil pressure would imply a reduction of flow restriction, rather than blockage. Blockage usually increases pressure (as long as sensor is "behind" the blockage). The flow restriction change can result from a couple situations. One is that restrictions are increased in size (or removed depending on your point of view), such as a bypass valve opening. Or, the supply of oil is reduced thus reducing the amount of "backing up" of the oil stream. If you've got a high volume pump and the pan volume and/or rate of drain back of the oil isn't fast enough you could be starving the pump. If your oil viscosity is too high for the operating temps, that could contribut to it not draining back fast enough. Given that you have up to 50# below 4500, assuming at operating temp not "cold", you may be too viscous on your oil. Especially so when I look at the numbers on the dyno.

With the remote system on the in-car installation, you've lengthened the supply path of the oil compared to the on-dyno configuration.