I hate to ask about an injector size but i just need to make sure of my size. I am building a supercharged 383 with near 15#s of boost. Im shooting for 650 up to 700hp flywheel. But im trying to get my injectors now. Do yall think low to mid 50lb injectors are needed? Im thinking around 52#lbs injector. Also what brand would yall suggest and last ? is can i have to big of an injector?

 

I would say somewhere around 60lb should do you good. I would call up racetronix, they have got your fuel needs covered. I would use a lucas, dephi, siemmens, etc.

 

I,VE been trying to get the same info from racetronic for the last 4or5 days with no reply,i don,t think they have a phone number.I was told there in Toronto Cananda.
Clary

 

I think 60# is good for 700RWHP boosted and around 900ish NA

Jay

 

That sound great! now i just have to find some 60# injectors w/out getting robbed

 

They are for sale all the time in the lsx parts section on www.ls1tech.com

 

Check the corral - You could make a living buying fuel parts over there and then selling them on GM boards. Injectors are almost always cheaper on the Ford boards... Don't know why.

 

I got mine on theturboforums.com basically brand new for $280. For seimens 60# but i think they flow like 65ish

Jay

 

Exotic Performance plus has the 60# siemes on for $419.00 us call Bob at 260-244-4808.
Racetronic got back to me last night an told me for the 60# to support 600to650 rwhp the fuel pressure would have to be set at about 58psi,i might go with the new 79lbs, there suppose to have good idle.
Hope this might help you out.

Clary

 

I am running 90ish% duty cycle with something like 60 psi up top, so what they told you sounds about right.

With this setup tuning idle and cruise is starting to get a little annoying, but def not a problem yet. Pulswidths below 2ms don't leave a lot of room for adjustment.

Of course many other factors go into it.

This is on 60# injectors