fore triple pump pressure drop and recovery

random84 said:

What PSI does your Hobbs trigger at?

The FPCM acts independently of the ECM tune for the most part, even though you're only using it as essentially a relay to trigger your 2nd pump. The FPCM is pulse-width modulated so although I am not familiar with using it in the fashion you are, I'd make sure I'm not getting variable voltage on my trigger wire - pumps will run even when they're not PWM compatible, but won't reach full flow and die early.

My second suggestion is to look at making sure you are hitting "high flow" early enough (ie lower the fuel flow limit to trigger it earlier) to make sure the FPCM isn't trying to modulate or cut out the pump based on it's confused expectation of what your flow and fuel pressure should be doing.

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NVscout said:

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07GTS said:

there are some settings that need to be done so u use the pressure sensor but also the fpcm isnt trying to correct anything based off it, are u manifold referenced fuel pressure now ? i dont think just setting those on the fuel tab work as u still need to set some other stuff, in the injector data set the rail pressure to min 150kpa and max 600kpa, in the fuel control module tab set the ''fuel pump'' open loop DC to all zero and min DC to all zero, set max desired pressure to all 600kpa, leave the rest stock see if that helps

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07GTS said:

because fuel pressure drops at that point it seems like something is still in play to control it, with an aftermarket pump setup with its own reg it really shouldnt be able too, just looking more at your log there is still the ecu/fpcm trying to adjust the fuel pressure as it jumps way too much so try the settings i mentioned they should allow the sensor to read but not make adjustments to it, u should be able to watch fuel pressure and boost and if ur base is 58psi (KOEO) then as boost increases each psi should add to the 58psi as its delta so ur at 20psi u shouldnt see fuel pressure over 78psi which yours goes well over that and moves around which a mechanical reg referenced to manifold shouldn't do unless manifold pressure is moving also,

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07GTS said:

u look to be some what scaled for the injectors also ? so there could be some other settings need changing if not done already also, was the injector data setup for the manifold referenced reg ? if thats not changed then u can be chasing your tail with the regulator and ecu doing the delta for the injectors where u only want the mechanical reg doing the delta now

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