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This is bad, but prior to now it’s been what most tuners have been doing, and we can see the effect of setting Load Limit Minimum - Injection monitoring to a flat 200% thereby preventing the load limit from this system dropping below 200%. You can see in the log below from a test to deliberately overload the HPFP, the fuel pressure drops to just 5Mpa which is “less than ideal” as the ECU tries to maintain high fuel demand (lambda target made rich for this test) at relatively high load. We now would recommend not to do this.
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HPFP Volume and Efficiency
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