hey mark, i am putting together a system for a turbo motor, i'm looking for 700-800hp out of it running a single t76gts.
i'm wrapping up the fuel system now, can you tell me what kind of pressure to run? i sumped the tank by welding bulkheads into the bottom, a -10 for the feed and -6 for the return.
i run -10 to the prefilter, then the pump and then -10 all the way to the front to the second filter. i'm using a 3/8 4 port aeromotive regulator, one comes from the filter into the reg and two split out to each fuel rail which has -8an fittings and matching line. then a -6 goes back to the tank.

i haven't decided on an injector size yet, i expect to run around 20#'s of boost to acheive my goal. i am using an a1000 pump and all areomotive filters and regulator. aeroquip fittings and braided lines.

is the -10 braided line correct for that pump then?! i know to mount it low, can it be at mid tank level or does it need to be below the tank?

so how should i rate my injectors and what kind of pressures will the a1000 handle?

thanks,
mike

 

A 72 lb LowZ injector would deffinitely handle the fuel delivery requirememts, but requires a peak and hold driver circuit such as the accel variable injector controller for an OE ecu. You would probably want to upgrade to an aftermarket controller though for a boosted application so you can adjust fuel delivery vs. boost. Your fuel pressure will be dependant on what injector you go with, the amount of control your ecu provides and the airflow capacity of the engine after it all comes together. I don't have a magic formula for you to determine fuel pressure ahead of time. The A1000 as noted will supply over 500 # hr @ 60 psi and 13.5 volts. That is enough fuel for 900 hp at a BCFC of .55 . It will supply over 450# at 70 psi. Enough for over 800 hp. The 72 lb injector is good for about 900 hp at its rated 43.5 psi at an 85% duty cycle.
The 72lb injector may give you a fat idle though Without going to 16 staged injectors, its a price you may have to pay.
The regulator is boost referenced so it maintains a constant pressure differential across the injector. So even though manifold and fuel pressure is rising, injector flow rate will remain relatively unchanged. The fuel delivery of any fuel pump will decrease with pressure, so it is important to know what the ultimate fuel pressure will be (under boost) to determine if enough volume is available.
Injector pressure flow rate change formula:

newFlow= (sqrt(newPress/oldPress))*oldFlow