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The Terminator
How-To
Return style wiring HOW TO allowing OE type fuel pump actuation
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<blockquote data-quote="laddanator" data-source="post: 15361717" data-attributes="member: 105114"><p>Weirdest thing. When I did my 04 Cobra swap into my 96 Cobra last year, I wired the relay as described on the first post. Pump primed key on, then shut off. I'm using the stock 96 fuel lines, as this car is return style. I drove the car this way for 4 months, no issues fuel wise. I decided to build a brand new motor, using a Cobra Engineering M122 kit, so I was not able to use my modified stock 96 Cobra fuel rails as I had before on the 04 setup. I ended up using my 04 Cobra rails with NO FRPS. I'm using a Division X fitting where the FRPS went, to feed a bypass regulator after the rails. I changed NO wiring to the relay, and using the same computer that was tuned for the swap last year. The car will start up, and run fine, but when I come to a stop, the car will shut off. This was driving myself, and my tuner crazy! Just for kicks, we wired pin 3 to chassis ground, and as expected, pump runs all the time with key on. Here is the kicker, this also solved the problem of the car shutting off at a stop. </p><p></p><p>I'm not understanding why the car ran for the months, no stall issue, but now it stalls, and no wiring has changed? The only thing that has changed from the last build to this build, is the 04 Cobra rails, and bypass regulator.</p><p></p><p>I'm not exactly sure my tuner setup the return tune as you have here </p><p></p><p>Returnless fuel pump --> Fuel pump voltage table - set all cells to max, usually 15</p><p>Returnless fuel pump - scalar</p><p>- fuel pump gain integral term - 0</p><p>- fuel pump gain derivative term 0</p><p>- fuel pump gain proportional term 0</p><p>Returnless fuel pump - desired pressure drop across injectors - (set to 4 PSI below base pressure set of fuel pressure regulator).</p><p>System switches --> scalar --> fuel pump type - 0</p><p></p><p>But regardless, the setup worked fine for months last year.</p></blockquote><p></p>
[QUOTE="laddanator, post: 15361717, member: 105114"] Weirdest thing. When I did my 04 Cobra swap into my 96 Cobra last year, I wired the relay as described on the first post. Pump primed key on, then shut off. I'm using the stock 96 fuel lines, as this car is return style. I drove the car this way for 4 months, no issues fuel wise. I decided to build a brand new motor, using a Cobra Engineering M122 kit, so I was not able to use my modified stock 96 Cobra fuel rails as I had before on the 04 setup. I ended up using my 04 Cobra rails with NO FRPS. I'm using a Division X fitting where the FRPS went, to feed a bypass regulator after the rails. I changed NO wiring to the relay, and using the same computer that was tuned for the swap last year. The car will start up, and run fine, but when I come to a stop, the car will shut off. This was driving myself, and my tuner crazy! Just for kicks, we wired pin 3 to chassis ground, and as expected, pump runs all the time with key on. Here is the kicker, this also solved the problem of the car shutting off at a stop. I'm not understanding why the car ran for the months, no stall issue, but now it stalls, and no wiring has changed? The only thing that has changed from the last build to this build, is the 04 Cobra rails, and bypass regulator. I'm not exactly sure my tuner setup the return tune as you have here Returnless fuel pump --> Fuel pump voltage table - set all cells to max, usually 15 Returnless fuel pump - scalar - fuel pump gain integral term - 0 - fuel pump gain derivative term 0 - fuel pump gain proportional term 0 Returnless fuel pump - desired pressure drop across injectors - (set to 4 PSI below base pressure set of fuel pressure regulator). System switches --> scalar --> fuel pump type - 0 But regardless, the setup worked fine for months last year. [/QUOTE]
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How-To
Return style wiring HOW TO allowing OE type fuel pump actuation
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