How much boost will 42 lb injectors hold
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GarrettM (05-06-2022)
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10-23-2011, 11:21 PM
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You should not be asking how much boost as in PSI. You should be asking how much horsepower they will safely support.
If you have a small turbo making 10psi, it will not be moving as much air as a larger turbo also making 10psi. So saying 10psi means nothing without knowing the rest of the setup.
If you have a small turbo making 10psi, it will not be moving as much air as a larger turbo also making 10psi. So saying 10psi means nothing without knowing the rest of the setup.
10-24-2011, 06:47 AM
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You should not be asking how much boost as in PSI. You should be asking how much horsepower they will safely support.
If you have a small turbo making 10psi, it will not be moving as much air as a larger turbo also making 10psi. So saying 10psi means nothing without knowing the rest of the setup.
If you have a small turbo making 10psi, it will not be moving as much air as a larger turbo also making 10psi. So saying 10psi means nothing without knowing the rest of the setup.
10-25-2011, 06:41 AM
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tried an injector calculator? might be called something else, but enter your Hp figure (or expected Hp figure), n/a or fi,e tc and as the charts show, follow what they say and they will give you an idea of what you need, or as a general rule for boosted lsx applications iv seen 60/65 lbs injectors as a safe bet with what should leave you some room to move later on.
10-25-2011, 11:31 PM
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the problem lies in the fact that i'm betting you didn't think about this either...
the more boost you run the less actual pressure the fuel injectors are outputting to the motor for injecting fuel. Hope I said that right..here is example: for instance fuel pressure is 58psi , you are running 10psi of boost. SO, actually, your fuel injectors are operating at 48psi under full boost and you better pray to god that they can flow enough at that pressure to provide you with fuel.
This is why people have Fuel Pressure regulators. Another reason to do so is to use a LARGE injector on a smaller application, so the injector scales back with MAP (Manifold pressure) or forward.
42# injectors will make you around 500 rwhp ~67 LB/min of air roughly at 11.5:1 AFR on a turbo application.
what are you looking for here? why are you asking this question? what are your goals?
the more boost you run the less actual pressure the fuel injectors are outputting to the motor for injecting fuel. Hope I said that right..here is example: for instance fuel pressure is 58psi , you are running 10psi of boost. SO, actually, your fuel injectors are operating at 48psi under full boost and you better pray to god that they can flow enough at that pressure to provide you with fuel.
This is why people have Fuel Pressure regulators. Another reason to do so is to use a LARGE injector on a smaller application, so the injector scales back with MAP (Manifold pressure) or forward.
42# injectors will make you around 500 rwhp ~67 LB/min of air roughly at 11.5:1 AFR on a turbo application.
what are you looking for here? why are you asking this question? what are your goals?
10-26-2011, 02:42 AM
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10-26-2011, 08:19 PM
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Really I’m trying to figure out what options are out there, I’ve started the build and was intending to fallow the sts kit offered, which I think runs 3 to 4 psi, or around there on stock injectors and fuel set-up and puts out around 400 hp at the wheels, now I’m thinking of maybe raising the bar, would like to see around 450hp and most cars from what I’ve seen run around 8 -10 psi, my question is would 42 lb injectors be ok to use(that and what psi), not sure on fuel pumps yet earthier. From what everyone is saying there’s a lot more factors, going to go back and read more.lol
10-26-2011, 10:23 PM
#20
if your goin for 400-450hp
aeromotive makes a nice 340 in tank pump I would use
and your 42's will work, but always better to go larger (60's) this way your not running those 42's at 95-100%
a "good tune" w/a more than suffecient fuel system is always a must when going FI.
aeromotive makes a nice 340 in tank pump I would use
and your 42's will work, but always better to go larger (60's) this way your not running those 42's at 95-100%
a "good tune" w/a more than suffecient fuel system is always a must when going FI.
