Hello all I'm in the process of having a turbo engine built only I probably won't have everything I need to turbo it until later this year so initially I'll be running the engine n/a and I wanted to know what size injectors you guys would recommend while it's normally aspirated?
Here's the combo:
Block: bored .020 and plate honed, 2.3 oil pump and oil passage mods, custom main girdle, ARP head & main studs, aling bored & honed mains.
Crank: New factory nodular crank, knife edged, deburred, oil holes chamfered, shot peened, nitrided and balanced LGO balancer.
Rods: Eagle 4340 forged H beams upgraded with L19 285,000 psi capscrews, resized and pin fit balanced.
Pistons: Wiesco forged 9.5:1 (with 086 head & .074 Cometic hg) with valve reliefs, Hellfire top, Total Seal 2nd, Standard Oil rings thick walled DSM wristpins.
Oiling System: New 2.3 oil pump &drive gear, 2.3 HO windage tray, custom modded oil pan 1.5 extra qt capacity with -10 oil return fitting ( for turbo).
Head: 086 HO head fully ported & polished, Stainless valves, Berrilluim exhaust seats, HO springs & seats, titanium retainers.
Cams: New W41 cams and 35mm Sealed Power lifters, 2.3 HO double roller timing set intake cam modded for cps and ps hex.
Intake: Extrude Honed and modded for 75mm LS1 tb.
Exhaust: 321 stainless equal length turbo header by Atomic with custom made T4 flanged downpipe t ( to connect to the rest of the exhaust until I install the turbo), 3" mandrel bent cat back with 3" Dyno max bullet in place of the cat and Magnaflow 3" muffler.
Fuel: Billet fuel rail, Aeromotive afpr, Walbro HO intake pump ( LT1 kit ), possible 440cc RC injectors?
Tuning: HPT Pro
2000 Z24 5spd header & catback for now.
http://www.rbracing-rsr.com/fuelinjectors.htm
right at the bottom is a good calc, it uses "lb/hour" not "cc" for injector size but you will get the point. Injector size is directly related to the amount of horsepower you want to run, and the fuel pressure you want to run.
I run 650cc (60ish lb.) and at 280whp I use 80% duty cycle at 71psi on a boosted application. If running NA you would use a little less fuel (leaner) but it should be noted that you don't really want to run over 80-85% if possible.
I use stock FPR no FMU or AFPR, just HPTuners, and it idles fine, has 100% driveability. I have heard of 750cc idling, starting, driving, perfect at stock fuel pressure.
Quote:
The RC Injectors you have chosen are 43 Lbs/Hr (rated @ 43.5 psi) are now rated at 50.50 Lbs/Hour at a new fuel pressure of 60 PSI, giving you a potential of 323.20 horsepower at a duty cycle of 80% and a bsfc of .5.
At a BSFC of .45 the potential is 355.52 horsepower.
just a sample of a result from that website using 40lb injectors.
HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED
Thanks guys normally aspirated and with only 9.5:1 cr I would expect between 230hp - 265hp at the flywheel so 440cc look like they may be borderline however I don't want too much fuel as it would wash out the rings before the enging is broken in. I will be using the Aeromotive afpr and I'd like to get the RC 440 or 550 cc injectors.
2000 Z24 5spd header & catback for now.
you can easily tune down the amount of fuel by changing 1 number in hptuners, check the tuning forum.
HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED
