Fuel System Requirements For Near 700 Flywheel Bhp?

[Chris Wilson]

I know some of you chaps see a lot of engine set ups, good and bad. I have built an all steel Nissan RB26 twin turbo Skyline race engine that could make 700 flywheel BHP on decent fuel. I am now at the stage of making the fuel system for it. It wont be running ethanol or methanol, just pump or "normal" race petrol. I am considering using a big Walbro in tank lift pump feeding a stainless swirl pot via -8 hose and a big -8 unioned filter. Twin Bosch 044 Motorsport pumps then suck from this pot via -10 lines and blow through two big -8 unioned filters, to a -8 T piece. A single -8 braided hose feeds one end of the fuel rail, and a -6 goes to the FPR and the from the FPR back to the swirl pot. The swirl pot has a top overflow return to the main tank in -6 hose and fittings. Should the -8 single main line to the rail be adequate? Everything else sound OK, I will be powering the two 044 pumps from the rear mounted battery with hefty cable and a 70 amp relay. Thanks.

[shanef]

Sounds pretty much on the spot but i'd change a few things to be like this:

-6 line from in tank pump to swirl pot

-8 lines from swirl pot to 044's

-8 lines out of 044's tee'd into a single -8 line that runs up the front and either tee's into two -6 lines feeding each end of rail, or keep the -8 going to one end of the rail

-6 line from end of rail (or centre of rail, depends if u want twin rail feeds) to FPR

-6 line from FPR back into swirl pot

i'd look at using a bosch intank instead of the walbro