SSClone

iTrader: (24)

Building my LT with Trick Flow heads, CC306 cam, and all the usual bolt-ons. Trying to figure out what injector to go with. Don't want to starve the engine of fuel and dont want to have it to rich. I have an adjustable fuel pressure reg. and a 255 intank pump. Shooting for 400rwhp or as close as I can get. Only want to spend the money once. Someone told me that I don't want to use more than 80% of the injector cycle or something like that. Which injector would be the best?

Derrick

The Big Show

iTrader: (2)

You shouldn't need much more than a 28lb or 30lb injector for your needs...

seawolf06

iTrader: (8)

FWHP x .07 = #/HR

500 x .07 = 35 #/HR

C_Rules

iTrader: (7)

dont put them bad boys on until you tune for them. im not even close to 500 and i got some 42lbs. i put them on just to see but the ar was running shitty which was expected. so i put the stockers back. i throw in the 42lbers when i get the tune.

only reason i went with such bing injectors is because you just never know what you're going to do next and why buy injectors twice. plus they werent even all that expensive compared to the smaller sizes. just a few bux more. i'll be fine with those bad boys as soon as i get this new tune.

96capricemgr

iTrader: (1)

I am running 32lbs LS1 injectors on my car at the approptiate 58-60psi and they are 87-90% DC. With the goal to stay below 80% you need to go bigger.
I would second the 42lbs SVO recommendation leaves you room to grow.

seawolf06

iTrader: (8)

42# SVO isn't going to be 42# in the LT1 since they're rated for different fuel pressures. Get the injectors from Racetronix, trust me. I think Siemens is making them now.

96capricemgr

iTrader: (1)

Going from the 42lbs at the SVOs 39psi rating to the LT1s 43.5lbs rating raises them to 44.4lbs.
This is likely a part of why people get away with the 30lbs. SVOs on strokers as they are 31.7 or bigger if your pressutre is over 43.5lbs. They will serve most strokers but will be WAY over 80% DC on a healthy one.

One thing being forgotten here is ask your tuner what he likes, the tuner often has to adjust more than just the size rating of the injectors in the pcm and you will do yourself no favors using something he is unfamiliar with or that he does not like for some reason.
That said I pretty much would trust anything Racetronix sells, they are a standup company out to offer very good products.

The Big Show

iTrader: (2)

LOL...yep, it's all bs.

GIZMO

iTrader: (8)

I am also going to add that running an injector at much less than an 80% duty cycle (WOT) is giving up HP. I feel that running the right size injector is as important as running the right valve spring. Leaving "room to grow" is not a good idea. That is, if you want to get the most out of your combination. Injectors are cheap enough and easy to sell when you upgrade.

Good Luck,

Daren

96capricemgr

iTrader: (1)

Can you elaborate? First I have heard that going big can cost HP. Given the way in which you have choosen to go about making power forces you to find the subtle details like this so I am all ears.

DroppedM6Z

iTrader: (5)

Forged 355 11.1:1comp, LE2 heads, gm847, stock injectors....ED WRIGHT TUNE. Runs amazing

96capricemgr

iTrader: (1)

What fuel pressure?

DroppedM6Z

iTrader: (5)

i think it's 58 and WOT and 4? at idle. Stock Reg to. Dyno numbers are coming but i'm just on a bench tune for now. When tax money come in dyno and dyno tune from him= money well spent. No need for that big of an injector on stock cubes. maybe once you get to a 383 or 396+

Ed is the best out there and when i asked what should i do about injectors he said....."Stock works prefect"

GIZMO

iTrader: (8)

I run a 24lb SVO injector in my stocker. I have tried the 30lb SVO's (And other brands) and have always found that, once I have my A/F ratio where I want it, I lose performance over the 24's. I have found that the 24's work best at 50 psi (in my application). I have tried the 30's at different pressures without success (always working at the same A/F ratio). I am no expert on fuel injectors, but I feel that the 24's work better (for me) because they atomize the fuel better. Throttle response is much crisper and the car works much better on the bottom end. I am not going to post my fuel map, but I will tell you that I am at nowhere near 100% duty cycle.

Daren

streetwarrior96

I have the Accel's 30lbs( I know they suck) but I have 0 problems with them

96capricemgr

iTrader: (1)

Either 58psi or stock regulator, both does not make sense. In theory the stock regulator is 41-47psi.

If you are pushing stock injectors to 58psi then they are acting almost 28lbs.

In GIZMO's case of 24lbs SVOs run at 50psi that is 27.2lbs.

I will say that my car is a little safely rich being a truely street car, heavy and with a fair amount of compression on stock pistons I feel a whole lot better leaving a couple HP on the table than leaning it out to the max. A set of forged pistons or a race car I can control fuel quality better on and I would do things a little different.

DroppedM6Z

iTrader: (5)

i'm prob wrong on those number but i know I'm using stock injecters and stock reg.If the stock reg it 47 why do i show 47 @ idle?

Whatever its at they are both stock, and Ed insures me they are what i need to use.