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SVT Shelby GT500
Id1000 and BAP or Return Style Fuel System for 11 shelby
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<blockquote data-quote="69b302" data-source="post: 14873853" data-attributes="member: 52691"><p>The issue with big returnless fuel systems, is what happens on shifts. Fuel demand goes from very high, to very low, and then back to high, all very quickly(assuming you can shift). I upgraded to return after data logging some 1/4 mile runs. I did have enough fuel(Fuel duty cycle low 90s) when WOT, but on shifts the fuel pressure would spike and then drop when getting back on the throttle. My Fuel pump duty cycle would spike to 100% and pressure drop across the injectors got as low as 18 psi. This only lasted a brief instant, but I calculated it was a couple firing cycles before fuel pressure recovered. You can do some tuning tricks to help, but the real solution is return. I have a lot invested in my motor, so once I reviewed the logs, I converted to return. You could no-lift shift or go auto trans and the issue I mention goes away.</p></blockquote><p></p>
[QUOTE="69b302, post: 14873853, member: 52691"] The issue with big returnless fuel systems, is what happens on shifts. Fuel demand goes from very high, to very low, and then back to high, all very quickly(assuming you can shift). I upgraded to return after data logging some 1/4 mile runs. I did have enough fuel(Fuel duty cycle low 90s) when WOT, but on shifts the fuel pressure would spike and then drop when getting back on the throttle. My Fuel pump duty cycle would spike to 100% and pressure drop across the injectors got as low as 18 psi. This only lasted a brief instant, but I calculated it was a couple firing cycles before fuel pressure recovered. You can do some tuning tricks to help, but the real solution is return. I have a lot invested in my motor, so once I reviewed the logs, I converted to return. You could no-lift shift or go auto trans and the issue I mention goes away. [/QUOTE]
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SVT Shelby GT500
Id1000 and BAP or Return Style Fuel System for 11 shelby
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