Injectors
#1
Injectors
Right now i have 30# SVO's (red tops) in my 383 in sig. I also have a 255lph pump, and a Holley adjustable FPR (still needs to be installed). The question is, for my current setup, are these injectors large enough? Over the winter i am considering doing a larger cam (575/575 somewhere around there). I would probably need to upgrade to atleast 36lb injectors then right? Opinions? Thanks guys
#2
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it all depends on the hp numbers ur trying to reach. 30# injectors support somewhere around 385 hp then the 255lph pump should add a little more
Last edited by riceburnerZ28; 10-26-2008 at 01:25 PM.
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From a calculator (Flywheel HP I presume):
Power: 400 horespower
Number of injectors: 8
BSFC: 0.40
Duty cycle: 0.80
This combination will require 262 cc/min injector (25.0 lbs/hour)
and your 30# (31.5# @ 43psi):
Injector size: 330 cc/min injectors(31.4 lbs/hour)
Number of injectors: 8
BSFC: 0.40
Duty cycle: 0.80
This combination will supply fuel for 502 horsepower
Now, take into account you have a AFPR, you'll be able to push the injectors higher. Don't know what your pump is capable of for pressure, and not sure if this is too high and not recommended BUT:
Old fuel pressure: 43
New fuel pressure: 60
At your new pressure, your 30 injectors will flow 35
Power: 400 horespower
Number of injectors: 8
BSFC: 0.40
Duty cycle: 0.80
This combination will require 262 cc/min injector (25.0 lbs/hour)
and your 30# (31.5# @ 43psi):
Injector size: 330 cc/min injectors(31.4 lbs/hour)
Number of injectors: 8
BSFC: 0.40
Duty cycle: 0.80
This combination will supply fuel for 502 horsepower
Now, take into account you have a AFPR, you'll be able to push the injectors higher. Don't know what your pump is capable of for pressure, and not sure if this is too high and not recommended BUT:
Old fuel pressure: 43
New fuel pressure: 60
At your new pressure, your 30 injectors will flow 35
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24# = 317hp (Which I was thinking 325 should be about what it shows up as)
31.5# (30# SVO) = 402hp
37.5# (36# SVO) = 481hp