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The Terminator
Engine/Tuning
Fuel Pressure Question
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<blockquote data-quote="ShadowDrake" data-source="post: 15366098" data-attributes="member: 46982"><p>I know you didn't get any timely replies on this but:</p><p></p><p>Tune - 100% the tune. Start by adding some D for the fuel pump PID controller, it doesn't need much. If it still is missing target increase P a little too. You can help alleviate this as well by disabling DFSO or setting it to target AFR of 18-19 instead of 21 during DFSO so it'll still open the injectors a tiny bit to bleed out the pressure if it does overshoot during throttle closed (inevitable to some degree, fuel pump is mechanical and can not respond to changes as fast as you can move the throttle plate).</p><p></p><p>Additionally if your injector flow vs fuel pressure is set up right, your AFR will not drift even if the fuel pressure moves off its 40 psi target. The stock sensor can read from 0 to about 75-80 psi. If your pressure is actually going higher than this the injector vs flow compensation won't be effective, clearly.</p><p></p><p>If you're not tuning it yourself, get it to a tuner who won't feed you a line of BS that you need to buy X, Y, and Z or switch to return style. Your issues can be fixed in the tune alone.</p><p></p><p>Interesting about the FPDM wiring - mine has had a ghost drain for so long now I've just gotten used to it. I'll have to check my BAP installation and probably cut the notorious wire for the GEM and see if I can get it so the battery doesn't go dead in 2-3 days if it doesn't get driven.</p></blockquote><p></p>
[QUOTE="ShadowDrake, post: 15366098, member: 46982"] I know you didn't get any timely replies on this but: Tune - 100% the tune. Start by adding some D for the fuel pump PID controller, it doesn't need much. If it still is missing target increase P a little too. You can help alleviate this as well by disabling DFSO or setting it to target AFR of 18-19 instead of 21 during DFSO so it'll still open the injectors a tiny bit to bleed out the pressure if it does overshoot during throttle closed (inevitable to some degree, fuel pump is mechanical and can not respond to changes as fast as you can move the throttle plate). Additionally if your injector flow vs fuel pressure is set up right, your AFR will not drift even if the fuel pressure moves off its 40 psi target. The stock sensor can read from 0 to about 75-80 psi. If your pressure is actually going higher than this the injector vs flow compensation won't be effective, clearly. If you're not tuning it yourself, get it to a tuner who won't feed you a line of BS that you need to buy X, Y, and Z or switch to return style. Your issues can be fixed in the tune alone. Interesting about the FPDM wiring - mine has had a ghost drain for so long now I've just gotten used to it. I'll have to check my BAP installation and probably cut the notorious wire for the GEM and see if I can get it so the battery doesn't go dead in 2-3 days if it doesn't get driven. [/QUOTE]
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