Quote:
Originally Posted by Joshinator99
Hi Ted,
As an HVAC Engineer I can comfortably say ALL pumps are subject to the laws of physics. So as I mentioned, as you attempt to raise pressure through the HPFP, you’ll reach a point where volume cannot keep up when you reach the physical limits of the pump. I have extensive experience with the LPE V2.0 pump in this regard. Attempting to increase volume through a fixed orifice will result in increased pressure, so that is what’s happening with the injectors. Again, great for a band aid on smaller injectors. But the pump itself, as you continue to request more pressure, will reach a point where the volume through the pump will not keep up and you’ll see the correlating rail pressure drop like a rock, likely due to cavitation within the positive displacement pump. Most people will not see this as the injectors are typically not big enough to max out the LPE’s output (with a bigger cam fuel lobe). Add +52 or +65 injectors and you reach the pumps pressure vs volume limitations pretty readily.
Josh
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I agree, I never said anything about trying to increase pressure when past PD displacement.
Your statement of higher pressure means less volume, then showing the electric pump chart, is incorrect in this case which I pointed out.
PD pump volume = pressure and Pressure = volume.
We log solenoid opening time, which controls the volume entering the piston chamber which in turn controls pressure and available volume.
Ted.