youguessit

How much power with a 255lph pump can these injectors support naturally aspirated. I dont want to hear what other injectors you suggest.... just know how much power they can support.

FICINJECTORS

iTrader: (30)

the real number based on 80% DS is 360.. Remember, that injector is rated 28 at 58psi.. the injector is a 24lb bosch 3. So, if you use any of the sizing calculators make sure you know that yours are 24's since the calculators figure the injector size based on 43.5,,

youguessit

It was my understanding that gm put bigger injectors in the later ls1 cars i guess do to their lower duration.... I was told by a friend who worked for gm that they were 28.8. I know for a fact that bigger ones were put in the later ls1 cars. Just didnt know what size till my friend told me. So the injector would be larger with the walboro pump and wiring kit behind it....i was told by a tuner that the aftermarket pump and wiring kit with the better stock injectors would hold close to 500 flywheel.

squee

iTrader: (16)

There is so much wrong with that its not funny. You could have all the pump in the world with those injectors and there still only gonna support so much power, and like already stated, its somewhere around 360. 400 if you wanna push it and max them out. If a tuner told you they would support that much power, I wouldn't let them touch my car for damn sure, cause he obviously isn't to good. Also, they are 28.8lb injectors, at 4 bar. They are 24lbs at 3 bar. LT1 is 3 bar, LS1 is 4 bar. The only difference is the psi. Psi goes up, and so does what they'll flow. Get it? FICINJECTORS explained it, but I guess not clearly enough.

FICINJECTORS

iTrader: (30)

its a misconception on this subject. The aftermarket rates injectors at a 3 bar standard. But the manufacturer rates them at the rail pressure of the particular car. The injector in your ls1 is a Bosch 3 part number 0280155931. That is a 24lb injector rated at 3bar. The same injector sold in the Ford Motorsports 24 box. Just like the ls2 has a 34lb, but again rated at 58. The injector is actually a Bosch ev14 #0280158049 which is a 28.5lb injector. The size of the pump will not make an injector flow more. All the pump will do is handle the demand better. The rail is regulated at 58 psi, the injector opens and closes the same way. As long as you maintain 58 psi that particular injector will perform as rated. If you increase the pressure it will perform differently.

1998Chv37s

Im Making 440 rwhp with stock injectors

ElkySS

iTrader: (6)

^^^wut u guys say to that?

squee

iTrader: (16)

Seems like thats asking for problems. I'd change those out before #7 leans and frys.

DarkJuggalo

iTrader: (6)

he never said it couldnt be done.... he just said you would be maxing out the injector.

82cetuner

iTrader: (9)

You should not run a injector over 80 percent duty cycle. Remember Horsepower is made by the amount of fuel and air you can push in. If you have a much bigger intake and tb and heads and cam I would change out the injectors cause if your not leaning the engine out, you are surly maxing the injectors out. not only is it not good if you actually change the injectors you might find some free HP since you can now put put the right amount of fuel to the air. and for what they cost its a descent upgrade.

The question you are asking is you want to limit your build to what your injectors are capable of, when they are one of the easiest things to change and wont require a tune, your MAF will determine how much fuel goes in in accordince with the air thats going in.

Until you have enuf air and fuel going into the engine to start making the stock FP lose fuel pressure then there was no reason to change it.

a shop telling you a FP will make hp is the same concept of a ricer thinking a wing will make his car faster.

a GOOD rule of thumb, most STOCK parts on production cars will handle just that STOCK HP and components. Leave them stock if you want to and increase HP but its either being stubborn or your beliving what a shop taking our money is telling you.

you would of been better off upgrading the Fuel Injectors befor the FUEL Pump

69LT1Bird

iTrader: (1)

Listen to Jon from FIC. He does this for a living. Don't drink the Kool Aid when people jump in here and recommend 42lb Ford Green tops or whatever the injector of the day is.

Talk to a injector professional, give them your engine information accurately and honestly and they will set you up with an injector that will work for your engine and be easy to tune.

I will say 320 engine horsepower for the stock injector at 80% dutycycle.

youguessit

ok well i am right about gm upgrading the injectors on ls1 cars right?

koolaid_kid

iTrader: (21)

What the blazes is THAT supposed to mean!!!
There are calculators, such as in the sticky at the top of this section, that allow you to do the math for horsepower, injector size, and fuel pressure. For example, you can enter the data for an injector at 3 bar (43.5 psi) and then change the pressure to 4 bar (58 psi) and see how it makes the injector "bigger". They are all estimators, of course, but can be used as a rule of thumb.
YMMV.
It would also be good to study up on fuel injector duty cycle and exacly what it means.
And the Koolaid is just fine, thank you very much.

69LT1Bird

iTrader: (1)

Just because that is your name does not mean I was referencing YOU.

It means don't blindly follow others without knowing all of the facts, don't be a sheep. Cult leaders have had people drink "the kool aid" and they all died because they were naive.

I apologize to anyone in advance with sheep in their screen name.

I know plenty about injector duty cycle, injector flow, how to tune etc.

w3s1c0a5t

iTrader: (3)

Im about 145% sure he was kidding... hence the wink...

Also if you really think 320 is all stock injectors will do you are definitely drinking some kind of "kool aid".

69LT1Bird

iTrader: (1)

Should have read 320 RWHP, I like it with a shot of Absolute.

w3s1c0a5t

iTrader: (3)

I bet you do a double shot.

According to you the 1,344,566 cars with more than headers(let alone cam cars) need injectors.

69LT1Bird

iTrader: (1)

As long as you and the others are all good running your injectors to the max, knock yourself out. Me, I like to run at 80% duty cycle.
The ET/MPH in my sig are with 39lb @ 58psi injectors. I was at 80-85% duty cycle with those at WOT. I just put in a new cam and now I need to upgrade the injectors, I show 95-97% duty cycle. FIC is setting me up with 42 @ 3 bar which should be good for 48 @ 58psi.

If you are going to make changes that are going to increase horsepower you will need bigger injectors or you run the risk of taking out the ring lands when you lean out. If you aren't running a wide band you will never know.

koolaid_kid

iTrader: (21)

Exactly. Lighten up, 69LT1Bird. At least I don't have a sex act in my name.
And I agree about tracking the duty cycle and the importance of a wideband. Collecting and analyzing data is the name of the game when it comes to tuning. Engines are expensive, and a PITA to replace/rebuild.

69LT1Bird

iTrader: (1)

Sex act in my name? Nice and grown up, well I guess I am done trying to help the OP.