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The Terminator
Terminator Talk
Return Fuel Stumble
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<blockquote data-quote="SecondhandSnake" data-source="post: 16412133" data-attributes="member: 116684"><p>Got the car out for the first time this year after switching to a return fuel system over the winter. It cruises around great, but when you step on it, as soon as the turbos start to spool it flat out falls on its face. I'm not talking breaks up or goes lean, it completely misses until you let out. Seeing as it ran beautifully with the returnless setup, I can only assume the issue is fuel system related. Has anyone ran into anything like this when they switched? I haven't got a chance to datalog it but I'd be curious for things to keep an eye out for.</p><p></p><p>Previous returnless fuel system steup: Cobra tank, dual GT pumps, dual FPDM, wiring upgrade, stock fuel lines.</p><p></p><p>New return setup: Sumped GT tank, Fuelab 41402 pump, -10 supply, -8 return, Fuelab regulator @40psid verified by mechanical gauge and readout, Fore rails, deadhead return system.</p><p></p><p>My first gut feelings are that I'm not getting enough flow from the pump due to mechanical issues or insufficient power. The pump is being run at 50% duty cycle, and according to the calibration sheet it came with, I should have more than enough at that. At 65 psi (40psid base pressure, +15psi boost, +10psi restriction) it should flow 90 GPH/9.45 lb/min, which at 10:1 AFR should be enough for nearly 900hp. It also only draws 11A at 65psi, which should be even less than the old GT pumps. Everything about this should be absurdly overkill.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 16412133, member: 116684"] Got the car out for the first time this year after switching to a return fuel system over the winter. It cruises around great, but when you step on it, as soon as the turbos start to spool it flat out falls on its face. I'm not talking breaks up or goes lean, it completely misses until you let out. Seeing as it ran beautifully with the returnless setup, I can only assume the issue is fuel system related. Has anyone ran into anything like this when they switched? I haven't got a chance to datalog it but I'd be curious for things to keep an eye out for. Previous returnless fuel system steup: Cobra tank, dual GT pumps, dual FPDM, wiring upgrade, stock fuel lines. New return setup: Sumped GT tank, Fuelab 41402 pump, -10 supply, -8 return, Fuelab regulator @40psid verified by mechanical gauge and readout, Fore rails, deadhead return system. My first gut feelings are that I'm not getting enough flow from the pump due to mechanical issues or insufficient power. The pump is being run at 50% duty cycle, and according to the calibration sheet it came with, I should have more than enough at that. At 65 psi (40psid base pressure, +15psi boost, +10psi restriction) it should flow 90 GPH/9.45 lb/min, which at 10:1 AFR should be enough for nearly 900hp. It also only draws 11A at 65psi, which should be even less than the old GT pumps. Everything about this should be absurdly overkill. [/QUOTE]
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