how big of fuel injectors?

[cyrez187]

i am doing the 420a engine with turbo running about 18 lb of boost. just woundering of how big fuel injectors i should be going with? does 550cc sound good?

 

[DSMPowerTSi]

550's will be almost maxed out on a big turbo with 18psi. I would suggest getting larger so that your ecu doesnt pull timing for high injector duty cycle.

 

[sqhopeful]

depends on what turbo.....but you prob will need something a little larger than 550's

 

[cyrez187]

its gonnna be a star stage 2 kit
so what around 650cc?

 

[G_S_X]

depends on what turbo.....but you prob will need something a little larger than 550's

Depends totally on the turbo, if you want a t25, then 450s should be ok , but if you want a 18g or something, 650s?

 

[cyrez187]

its a Star Turbonetic t3/t4B Turbo sooo how big u think?

 

[95GSXBLUR]

650cc are fine... if you don't go over 18

if you wanna boost more, or are thinking about boosting more..

750s.

 

[cyrez187]

well how much hp would i be pushin at around 18 boost?
and 750 that high?

 

[95GSXBLUR]

it depents on your supporting mods.. i'm not very familiar with the 420 motor.. but a guess should be around 300 wheel horsepower... just make sure you have sometime of datalogging or tunable ECU so you can control the injectors..