Ok i got my new cam, i am looking into getting heads right now and saving for the rotating assembly. My question is what size injectors will i need for the motor. I can buy a set of new 25# injectors for a 100 bucks or do i need to go bigger. also what brand is best of the money (im on a buget) i have heard bad things about accel when used with n2o.


here is what i am building

zz-9 cam
LT4 heads
hardcore racing 355 rotating assembly
4 bolt LT1 block
zex wet kit for a 125 shot

Also what stall speed do you think i will need?

thanks for any help you can give.

 

New fuel pump will be necissary.
Basing this that you will have the heads ported... as far as injectors id say 30#s minimum, 36# would be preferable. To keep the duty cycle under 80%.

 

Here's a calculator for you...

http://www.smokemup.com/auto_math/fuel_injector.php

 

My recommendation is 24# up to 375flywheelHP, 30# up to 450flywheel and 36# up to 550. There is no harm in going a little higher on flow rate capacity, as long as the correct info is programmed into the PCM. The Bosche pintle style injectors seem to work fine and be available at reasonable prices for "flow matched" sets. They are sold as SVO, FMS, Ford-Denso, etc.

Since you are using a wet nitrous system, it will have no affect on your injector sizing or choice.