We are running 1240 rwhp with stock fuel line (but with a return line) and stock LS9 fuel rails.
At the fuel pressures most EFI systems operate at, the couple psi drop across the rails make very little difference in injector size. In addition if you have a mechanical regulator in the engine compartment (or an electronic control feedback system with the pressure sensor in the engine compartment) the pressure drop just makes the fuel pump work a little harder since you need slightly higher pressure at the pump to achieve the desired pressure at the regulator.
Most of the sizing requirements people use for figuring out line sizes are based on low pressure systems and the fuel carrying capacity is much higher at current system pressures and the percentage pressure drop is much lower.
As a point of reference, take a look at your injector orifice sizes - add up the 8 injector orifice cross sections and then compare that to your fuel line size (and all 8 injectors aren't firing at once).
Quote:
Originally Posted by klatterblast
looks good but to get 1300 hp out of it seems that you will have to redo the entire system w/1/2" fuel line.
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