Injector Calculator

[Red4Coupe]

Thought you guys might be able to make use of this. Making EDUCATED guesses is the name of the game...Hope this helps out.

INJECTOR CALCULATOR

I calc'd my build out last night.

I can't recall the % drivetrain loss there is for whp on FWD so I went with 15%

480bhp(~408whp)
BSFC = .65 (Turbocharged Motor)
Duty Cycle = .65
PSI @ Rail = 55psig (which I think we can do just fine since we sit @ like 40 I think)

Injector Size = 1122cc (so a 1000 - 1100cc might work for the build if not bigger)

INPUTS? Anyone?

Tim

[ProjectSW1]

thanks for the link, i'm going to post that fucker in the Tech Articles

[Red4Coupe]

See I AM good for something =)

[funkymonkey]

sooo, 1100cc for me. ian (qwksl2) here i come!!!

[saturnspeed_12]

thats half the part. now you need to figure out the rest of the fuel system.

if it was me, i would increase pressure a bit more and increase the duty cycle to 70-75%

[Red4Coupe]

I shot another set of numbers as such:

480bhp~408whp
BSFC = .65
DC = .70
Pressure = 60 PSIG
right around 994 or 1000cc injectors

Also shot this:

425bhp = 361.2whp
BSFC = .65
DC = .70
Pressure = 80psig
765cc Injectors

I'm not sure what a safe pressure is on the ECOtec fuel rail so I didn't go apeshit on the pressure. Oh yeah, also thought back on that comment about considering the rest of the fuel system. I'm going with a Walbro 255L/hour pump and an FPR from Aeromotive as well as some SS braided lines for the fuel movement, most likely going to convert it to a return style as well. So I have thought about the rest of it...just so happens that I posted this before I confided in you about the rest of the fuel system. [img]{SMILIES_PATH}/icon_razz.gif[/img]

Tim

[saturnspeed_12]

cool. but i just looked in my gm performance guide book, and dont see anything about the fuel rail, which im sure can take like 60+psi. but i also noticed their fuel injector suggestions for certain power ranges, and for 400-600 they say to use 4 70lbs (like 735cc) injectors, tuning of course is the key to making certain injectors work.

[Red4Coupe]

Hrmmm.../ponder