Just what topic says...for my fully built lsvtec motor. I'm really strapped for cash too with all these mods I'm doing...I'm planning on keeping my stock fuel rail because an aftermarket one (AEM) cost over $100, and just add an aftermarket fuel pump. Any comments?


[Modified by EF_LSVtec, 1:34 PM 10/7/2002]

 

walbor intank fuel pump.
rc injectors
no need wat so ever for a fuel rail

my friend has been running his 13;1 cr ls/vtec on a stock ls fuel pump and gsr injectors..motor still runs storng but id suggest the fuel pump and rc injectors to him also...

 

true. no need for fuel rail until 250 hp at least.

intank fuel pump--go nuts. do what you want. walbro 255's are what the kids are into these days.

brake horsepower X brake specific fuel consumption
________________________________________ = injector size (flow rate)
number of injectorsX .8

the scaler .8 adjusts the calculated injector size to produce the fuel necessary for peak power at 80% of the duty cycle. an accurate BHP figure is critical for proper injector sizing, but not all dynamometers have fuel flow instrumentation, so BSFC is often estimated at approximately .5 pounds/ BHP-hour for normally aspirated engines.
for example, look at an engine with a known BSFC or .49 making 300 horsepower. applying the formula:
300(hp) X .49
_____________====45.9 pound per hour injector flow rate.
4(# of injectors) X .8

you can also calculate the maximum horsepower a given injector size can feed by plugging a known injector size into the formula using either the measured or estimated BSFC.

flow rate x number of injectors x .8
___________________________===hp
BSFC
information taken from the high performance honda builders handbook, by joe pettitt. copyright 1996