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Message: [QUOTE="TARM, post: 412522, member: 578"] You have that all wrong. These pumps flow a certain volume based of RPMS(revolutions) i.e fixed displacement. [I](Yes there is of course a limit but its much higher than anything we could ever use in these systems.)[/I] It is the restriction of flow that controls psi. This is effected by the IPR via ICP sensor reading vs called for psi and what the injectors are using based on their specs and performance. You take a stock pump and block off the IPR port and dead head the output ports and you will see pressures way over those. :shocked: HPOP pressure is taken from driver side oil rail port via the ICP sensor. It actually is a pressure transducer that reads the real not called for oil pressure and converts it to a specific voltage to send to the PCM. The PCM then sends a signal that controls the IPR valve to keep pressure at the "called for", by the PCM program, pressure. Scanners can only read the actual pressure from PCM as reported by the ICP sensor. The way we know how hard the pump is working to keep that pressure is by the duty cycle of the IPR valve again controlled by the PCM via the data it receives from the ICP sensor. We can assume if the IPR% is 60% or over that its really max'd based on the way the valve works. Now from that you still do not know what pressure the tune (PCM program) is calling from but we can reasonably deduce its likely over what the pump is putting out or if lucky right at whats being called for. If the duty cycle is 45% or lower we, with reasonable accuracy, can deduce that is likley what is being called for as the pump still has more capacity left if more was needed. [/QUOTE]

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