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Opinions needed on injectors

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Old Jul 7, 2014 | 10:07 AM
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Default Opinions needed on injectors

I'm currently running a LQ4, 2 bar SD, Masterpower 76mm turbo and 60 pound injectors on stock LS1 rails.

I just switched cams from a LS6 to an Isky 218 with a 80mm GT45 Turbo. I want to go 3 bar now so that I can try between 18-20 psi. Do you guys think 80 pound injectors will be enough or will I need larger ones? Also will I need to change fuel rail? Thanks in advance!
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Old Jul 7, 2014 | 10:15 AM
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What fuel and how much power? I run 80s and did 888rwhp @ 95% duty on an auto car. Last build was 80s at 975rwhp @ 98% duty 6sp.

93pump/C12
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Old Jul 7, 2014 | 10:27 AM
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Originally Posted by ablakez28
What fuel and how much power? I run 80s and did 888rwhp @ 95% duty on an auto car. Last build was 80s at 975rwhp @ 98% duty 6sp.

93pump/C12
I'm also running pump gas but I've never dynod the car so I'm not sure of HP. How many pounds of boost did it take to make those numbers and what size is your engine? Also do you think the major differnece in the two results were as a result of the trannys?
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Old Jul 7, 2014 | 10:35 AM
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80s will be fine @18-20psi
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Old Jul 7, 2014 | 10:42 AM
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Originally Posted by ls1_chevelle
80s will be fine @18-20psi
Do you think they will keep up if I run the full 3 bar? In other words, if I'm gonna switch to 3 bar I would prefer to use the injectors that can cover the full range if I ever decide to push it or if my WG acts up on me at the higher boost levels.
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Old Jul 7, 2014 | 11:03 AM
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lets be realistic... is your engine capable of handling a maxxed out 3 bar? What does the rest of your fuel system consist of?
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Old Jul 7, 2014 | 11:17 AM
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Originally Posted by ls1_chevelle
lets be realistic... is your engine capable of handling a maxxed out 3 bar? What does the rest of your fuel system consist of?
Also would a GT45 maxed make that much power?
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Old Jul 7, 2014 | 11:22 AM
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Originally Posted by ls1_chevelle
lets be realistic... is your engine capable of handling a maxxed out 3 bar? What does the rest of your fuel system consist of?
Probably not I'm just trying to avoiding doing it twice if I don't have to. But to answer your question, I kept things very simple with two walbro 255s (Y together into a single -6 line) corvette return style fuel filter and stock LS1 rails. That's why I mentioned earlier the limits of the rails as well.
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Old Jul 7, 2014 | 11:28 AM
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Originally Posted by rockoosi1
Probably not I'm just trying to avoiding doing it twice if I don't have to. But to answer your question, I kept things very simple with two walbro 255s (Y together into a single -6 line) corvette return style fuel filter and stock LS1 rails. That's why I mentioned earlier the limits of the rails as well.
Then why go overkill on injectors if your fuel system is like it is, plus the turbo and the engine?

You will be more than capable of deleting engine parts with 80s. 350 bucks vs 600+ for injectors. Is that in your budget? Are new fuel rails and larger feed/return/filter in your budget?
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Old Jul 7, 2014 | 11:43 AM
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Originally Posted by ls1_chevelle
Then why go overkill on injectors if your fuel system is like it is, plus the turbo and the engine?

You will be more than capable of deleting engine parts with 80s. 350 bucks vs 600+ for injectors. Is that in your budget? Are new fuel rails and larger feed/return/filter in your budget?
Not trying to go overkill, these are just questions because I'm just now approaching the limits of my current setup. I figured it would be better to ask folks that have made the transition instead of guessing at it myself...but what do I know? But if I could use my current setup without redoing my entire fuel system that would be great if that's possible. I’m not implying that you don't know this information, but are you running a similar setup as mine or are you just guessing at it? Just trying to avoid cluttering up the thread with hypotheticals because like I said I've never taken it this far myself. I hope you understand what I'm saying.
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Old Jul 7, 2014 | 11:53 AM
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If you are worried then just buy bigger then 80s. I don't think you need them. Not sure what further info you are looking for? I don't think 2-255s will out run them nor do I think a GT45 maxed out will. I have been wrong before though.
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Old Jul 7, 2014 | 12:01 PM
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Originally Posted by ablakez28
If you are worried then just buy bigger then 80s. I don't think you need them. Not sure what further info you are looking for? I don't think 2-255s will out run them nor do I think a GT45 maxed out will. I have been wrong before though.
Cool! Thanks for the input!
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Old Jul 7, 2014 | 02:15 PM
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Originally Posted by ablakez28
If you are worried then just buy bigger then 80s. I don't think you need them. Not sure what further info you are looking for? I don't think 2-255s will out run them nor do I think a GT45 maxed out will. I have been wrong before though.
Pretty much what you and I have said the whole time lol.

80s will take you to the point of grenading a stock 6.0l(assuming stock as you never listed it as a built deal).

Like mentioned... if you are concerned that 80s are too small, buy bigger then, but understand your fuel system wont support them.

I've ran 60's to 700rwhp(plenty have made more on 60s than me), I've ran 80's to 900(Plenty have made more on 80s) and now Im running ID1300s on a basic stock crank, forged rod/piston combo... A1000 fuel pump, -10 feed -8 return. Not stock rails, Aeromotive filters...

Last edited by ls1_chevelle; Jul 7, 2014 at 03:14 PM.
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Old Jul 7, 2014 | 02:59 PM
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Originally Posted by ls1_chevelle
Pretty much what you and I have said the whole time lol.

80s will take you to the point of grenading a stock 6.0l(assuming stock as you never listed it as a built deal).

Like mentioned... if you are concerned that 80s are too small, buy bigger then, but understand your fuel system wont support them.

I've ran 60's to 700rwhp(plenty have made more on 60s than me), I've ran 80's to 900(Plenty have made more on 80s) and now Im running ID1300s are a basic stock crank, forged rod/piston combo... A1000 fuel pump, -10 feed -8 return. Not stock rails, Aeromotive filters...
I get what you both were saying now. I just didn't know if you guys were suggesting that the 80s would do it with the LS1 rails. As you know, there are a TON of guys who chime in on these post with all the advice in the world and you find out later that they've never even gotten their own cars started...lol. Thanks again for the input.
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Old Jul 7, 2014 | 03:51 PM
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60s might work out for you but I would run a return off the rail with a rrfpr instead of how you're set up now. 18 to 20 psi off that turbo on a 6.0 should do around 700 plus depending trans and tune. I was making 640 plus 18psi with a 4.8 threw a th400 with 80 lbs injectors and a walbro 400
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