TravisMcGill2000

iTrader: (2)

What size injectors do yall guys think i need. New motor is a 355 with le trickflows ported ibtake, 236/244 cam, and will b spinning to 7k. I currently got 30lb svos. Should i go 36 or 42s. Thanks

RamAir95TA

iTrader: (2)

42#s will allow you some room to grow. I run 42#s in my motor with a similarly-sized cam.

lt1slowz28

go bigger if you can.. allows room for growth later

42#'s will be fine

moehorsepower

iTrader: (3)

^^ What he says..

flyinZ

iTrader: (15)

Same here, 42#'s.

GIZMO

iTrader: (8)

The 30´s are the biggest that you should run (N/A). 24´s would probably be faster if you crank the fuel pressure up a little. The idea that you ¨grow¨into injectors is dumb. Any motor requires X amount of fuel. Upgrade the injectors when you build more motor (a lot more motor N/A).

flyinZ

iTrader: (15)

If he is still going to run nitrous, Id still stick with the 42#'s.

TravisMcGill2000

iTrader: (2)

Plan on sprayin 200+

05HD

What, dry?

defaultexistence

iTrader: (11)

42# and twin pumps

BOLO

iTrader: (40)

Very interesting point there. So, will the 30#'s still be good for a 383 motor N/A?

TravisMcGill2000

iTrader: (2)

No will b wet with 1gallon with c16. Sorry should have said that earlier. So if im sprayin a wet shot can i stick with the 30s gizmo?

bowtienut

iTrader: (1)

Only one person in this thread up to to now has given you the right advice. GIZMO has it right.
I make 425 SAE with 30 lb SVO's, stock fuel pressure, plenty of headroom. It has nothing to do with how high you spin it.
If your 200 shot will be a wet kit, the 30 lb injectors you already have are what you should stay with.

bowtienut

iTrader: (1)

Yes, we're making over 500 rwhp NA over here with 30 lb SVO's.

BIGCAT7274

What's the duty cycle on what you have?

95mysticta

iTrader: (4)

Im running Accel 30lbs with my setup at 88% duty and mine aint no 425rwhp beast.

05HD

I'm having a hard time with this in my head. Can you explain how smaller injectors make the car faster? Only thing I can come up with is something was missing in the tune for the bigger ones.

draggin97s10

iTrader: (2)

yes because the spray pattern is better with the properly sized injector. Check through gizmos threads when the switched to a smaller injector and pick up a tenth or two

05HD

If that is the case, our stock injectors and SVO 30s are both ancient designs. A bigger, newer injector would atomize better even at 1/2 the pulse width plus have a much better chance of getting all of the fuel in while the intake valve is open.

SS RRR

iTrader: (2)

One rule of thumb suggestion for minimum injector size is to multiply projected flywheel HP X .07.