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Chosing injector size

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Old Sep 21, 2018 | 05:08 PM
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Default Chosing injector size
So I was on the phone with my tuner and the last of my things will be comming in the mail shortly, I have my fast 92, 92mm tb, 98mm lid, 1 7\8 long tubes 3in x pipe and this weekend will be putting in my cam, bolting on my heads and then needing a tune he told me to buy a set of LS3 fuel injectors that I see are 42lb injectors and in order to use them I have to buy some type of adapter to use them with the price of the injectors and thing I have to buy to make them work im looking at the same price of a new 48lb injectors now my question would be is 48lb injectors too big to use on my current setup? and if I do buy the 48's could he just turn down the duty cycle so I could keep them for use when I upgrade my motor further?
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Old Sep 21, 2018 | 05:19 PM
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I would run gtp injectors. You can get 8 of them for around $100. They are 36# that flow at around 40# at our fuel pressure. That is what I run with the setup in my sig.
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Old Sep 21, 2018 | 05:41 PM
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Who did you decide to go with for tuning if I may ask?
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Old Sep 24, 2018 | 03:06 PM
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yes he should be able to dumb down the injector.
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Old Sep 24, 2018 | 10:23 PM
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I run the GTPs too. They looks just like the stock ones but different color. I have some if you need them as well.
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Old Sep 25, 2018 | 03:10 PM
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Looks like im going to go a different route, talking with the tuner that I am having do that car I am going to make a switch to e85 and he has recommended 60lb injectors
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Old Sep 25, 2018 | 05:48 PM
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One thing to keep in mind is not to go to big. Generally the bigger u go the tougher to tune they can be. A 42 pound at 58 psi will be plenty for u
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Old Nov 7, 2018 | 02:12 AM
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Originally Posted by Floorman279
One thing to keep in mind is not to go to big. Generally the bigger u go the tougher to tune they can be. A 42 pound at 58 psi will be plenty for u

Even for e85?
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Old Nov 8, 2018 | 09:56 AM
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No e85 you will need to run a bigger injector. Listen to your tuner with using the 60lbs, sounds like he knows what hes talking about. If you need any let me know
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Old Nov 8, 2018 | 09:15 PM
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60lbs on a stock head stock cam car with E85????
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Old Nov 9, 2018 | 08:24 AM
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Originally Posted by Mike Morris
60lbs on a stock head stock cam car with E85????
I think he said he was putting in a cam this weekend at the top of this thread. Im not sure which cam though.
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Old Nov 9, 2018 | 11:16 AM
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Originally Posted by AUS Injection
I think he said he was putting in a cam this weekend at the top of this thread. Im not sure which cam though.
First post on the bottom says he's still deciding.
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Old Jan 10, 2019 | 09:54 PM
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Originally Posted by Mike Morris
60lbs on a stock head stock cam car with E85????
I'm looking at running flex fuel on a stock head/cam LS1. So, the 42#ers are GTG?
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Old Jan 12, 2019 | 08:09 AM
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I ran rejetted stockers (48ish) from FIC for a bunch of years and was super pleased with them.
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Old Jan 20, 2019 | 11:19 PM
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Originally Posted by bigsapper
I'm looking at running flex fuel on a stock head/cam LS1. So, the 42#ers are GTG?
Mine were a tad too small. Running 50lbers now.

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