Quote:
Originally posted by keakua
if you really want to find out what you need here's some math to help you out...
first estimate horsepower: 300 your shooting for?
next (BSFC) brake specific fuel consumption: .45 is lean, .55 rich (use .5 as an average)
then duty cycle of each injector. keep in mind that they are rated at 100% duty cycle (DC) in regards to output, but greater than 80% (.80) will kill the life of the injector.
NC (# cylinders): 8
here it is: [(HP x BSFC)/NC]/DC= injector size
[(300 x .5)/8]/ .80
=23.44 lbs-hr or 24# injectors.
thats assuming you have the pump and regulator to max out the injectors. cranking up PSI can only spit out as much fuel as the injector can flow. i maxed out my 24# injectors at 392 hp on the dyno before putting a hole in a piston. up to that point 24s are a safe bet. especially since jumping to the next size is about 200$ more expensive then the 24s. stock injectors will get you safely to about 250 hp. i learned my lesson the hard way, you dont want to max out your fuel supply unless your fiance doesnt mind not getting an engagement ring cause you spent the money fixing your motor.
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I have a question since 30 pound injectors are the next size up,where is this ad that says 30 pound injectors cost 400 dollars? The most I have seen 30 pound injectors is $299.
Fancy math is cool and all that,but at least get the price of the injectors right.