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Message: [QUOTE="CurtisF, post: 162384, member: 829"] The short story: the longer the injector is open, the more oil volume is required. Bit longer explanation: If an injector is empty in "X" amount of time, then there's no reason to hold it open longer than that specific amount of time. If you do, then oil pressure will drop, because the volume needed to keep it open that extra amount of time increases. However, it's quite common to find higher HP tuning that holds injectors open for a VERY long time. In that case, it's typically an indication of tuning, not the pump, that is the issue. Then you may or may not need an HPOP. Get the injectors first, then see how your pump is holding up. If anything, it will save you money in the short term until your actual oil needs arise. What you're describing here is the internal workings of the injector, not the HPOP. The HPOP system, whether stock or modified, is a fixed displacement system. It's always going to provide the same oil volume for each revolution of the pump. Speed of the injectors don't matter to that system as long as the volume required by the injectors does not exceed the volume the pump can supply. Adding more volume (via modified HPOP setups) simply increases the available oil volume to those injectors. [/QUOTE]

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