MTBSully

iTrader: (7)

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

riceburnerZ28

iTrader: (20)

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

StealthFormula

iTrader: (35)

I would say your about on the verge of needing 36's now and if it were me I would sell your 30's and pick up some 36's especially since your going with a larger cam in the near future.

Formula350

iTrader: (3)

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

MTBSully

iTrader: (7)

so your saying my red tops should support 500+hp? never heard anything like that before. I was thinking i should atleast upgrade to maybe some 36#ers

robsquikz28

iTrader: (246)

yeah....... 30's support up to 400 tops every body tell u that safer is better if your running that setup step up to 36 or even 42 depending on your funds and say you add
n20 later safer is better......

Formula350

iTrader: (3)

You're right, I used an incorrect BSFC .40 was used where .50 is more accurate for our cars.

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