possible power from stock injectors - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Skids2212 · 03-26-2008, 12:08 AM

do the math

122ci x lets say max power at 6500 rpm x .9 Volumetric Effieciency x 2.36 pressure ratio/ 3456 = CFM motor will flow = 487.36 cfm

now take 487.36 cfm x .44298 / by 4 cyl = lb/hr injector size = 53.97 lb/hr x 10.5= 566.685cc i would get 740cc injectors to be safe.

if you wanted to run stock injectors

you would need to at least triple the fuel pressure and that would put you at about 130 psi have fun

/nerd

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03-26-2008, 12:08 AM	#6
Skids2212 Join Date: Nov 2006 Location: Tacoma, WA Age: 36 Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	do the math 122ci x lets say max power at 6500 rpm x .9 Volumetric Effieciency x 2.36 pressure ratio/ 3456 = CFM motor will flow = 487.36 cfm now take 487.36 cfm x .44298 / by 4 cyl = lb/hr injector size = 53.97 lb/hr x 10.5= 566.685cc i would get 740cc injectors to be safe. if you wanted to run stock injectors you would need to at least triple the fuel pressure and that would put you at about 130 psi have fun /nerd