4.3L Vortec Fuel Injectors - S-10 Forum
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4.3L Vortec Fuel Injectors

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Old 02-28-2007, 06:09 PM   #1
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Post 4.3L Vortec Fuel Injectors

Hey there,
Does anyone know what the size is of the stock fuel injectors? and if I go to one/two/maybe even three sizes bigger would I have to reprogram my computer? also, would this increase power or do I risk causing damage, or flooding my engine? and lastly, do you guys know of a good company to get them from, prices, quality?
thanks
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Old 02-28-2007, 06:18 PM   #2
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Re: 4.3L Vortec Fuel Injectors

what year 4.3?
Old 02-28-2007, 08:45 PM   #3
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Re: 4.3L Vortec Fuel Injectors

2001
Old 02-28-2007, 09:30 PM   #4
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Re: 4.3L Vortec Fuel Injectors

There is no real easy way to upgrade the injectors for the 2001 year you would have to mod a eldebrock 2114 manifold for bousch(sp) style injectors, plus you realy dont need them unless you have some power to use them (ie. super or turbo charger).
In otherwords you probable dont need them.
Old 02-28-2007, 11:08 PM   #5
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Re: 4.3L Vortec Fuel Injectors

19lbs/hr at 43.5psi.

Fuel system pressure is 60psi though, so they act like 23.1lbs/hr

I run 32lb/hr injectors at 43.5 psi on the stock intake manifold, you have to push really really hard to get them through the aluminum.
Old 03-01-2007, 12:57 AM   #6
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Re: 4.3L Vortec Fuel Injectors

Quote:
Re: 4.3L Vortec Fuel Injectors

19lbs/hr at 43.5psi.

Fuel system pressure is 60psi though, so they act like 23.1lbs/hr

I run 32lb/hr injectors at 43.5 psi on the stock intake manifold, you have to push really really hard to get them through the aluminum.
alright so basically if I wanted to step up a size I would go to 20lbs/hr? and would it really make a difference or would I have to match it with a better fuel pump as well?
Old 03-01-2007, 12:59 AM   #7
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Re: 4.3L Vortec Fuel Injectors

Quote:
There is no real easy way to upgrade the injectors for the 2001 year you would have to mod a eldebrock 2114 manifold for bousch(sp) style injectors, plus you realy dont need them unless you have some power to use them (ie. super or turbo charger).
In otherwords you probable dont need them.
alright thanks, I guess i'll just have to do some research and see what I can do. I was thinking of a super charger when I save up the cash but I was looking for something a little more right now
Old 03-01-2007, 01:28 AM   #8
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Re: 4.3L Vortec Fuel Injectors

Quote: Originally Posted by jwykes

alright so basically if I wanted to step up a size I would go to 20lbs/hr? and would it really make a difference or would I have to match it with a better fuel pump as well?
20lbs/hr wouldn't be worth it. I would go a minimum of 30lbs/hr, and depending on what your hp goals are will dictate how large of injector you will need.

A larger fuel pump may not be needed. I run my fuel system at 43.5 psi now, so i can pump more fuel than at 60psi. If i find my injectors can't handle my fueling i can always raise the pressure.

Also, if you didn't notice in the above picture that is completely modified. There is a ton of work to get real injectors into a 4.3

Also, don't forget about tuning. I didn't gain or loose fuel economy with the injector change. Didn't gain any power either. When i throw my roots blower onto the manifold i will have enough fuel to support the air that i expect though. This is why you change injectors, to keep the air fuel ratio in line when go go beyond what the stock fuel injectors allow.
Old 03-01-2007, 01:31 AM   #9
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Re: 4.3L Vortec Fuel Injectors

oh ok, ya I noticed the pic had quite a bit in there
I guess i'm basically at the end of the cheap little things to add more power, like intakes exhausts, that kinda stuff.
I recently just did the bored throttle body and was thinking of a high flow air sensor but after that its time to get into cams, blowers, nos, that fun stuff.
thanks for the help though, i'll probly just leave the injectors alone until I need bigger ones
Old 03-01-2007, 11:47 AM   #10
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Re: 4.3L Vortec Fuel Injectors

the stock injectors are fine for you right now. you shouldnt have bothered with the bigger TB, and forget about the bigger MAF.

move the cam up to next priority... much bigger improvements than with TB/MAF combined...
either that, or install nitrous.
Old 03-02-2007, 01:13 AM   #11
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Re: 4.3L Vortec Fuel Injectors

now i've looked into NOS a little bit, but what I have never been sure of, is it a hard install or something i can do over a weekend? and correct me if i'm wrong but until I make an engine that can handle it, would I wanna stick with like 50-150 shot so I dont burn my engine out?
and as to the cam question, what would be a good cam to research, I know of lots of cams, I have just done more work on older 350's not the newer style engines, I would probly keep it to a roller but I'm just wondering what you guys have had a lot of luck with
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