i got 310cc injectors for my ls motor, but whats the point in getting them?
is it so the duty cycle on the injectors won't be so high as they would when using stock injectors?

 

yes

 

thanks...just wanted to make sure i had it right.

 

so i guess your going turbo, if you are I would advise bigger.....well it all depends on your fuel managment.

 

i've been turbocharged for like 2 months or so already. i just finally got bigger injectors so i can turn up the boost some

 

310 are probably good for safe low 200's without taxing fuel pressure or injectors themself..

 

can you elaborate more on that? i want to push about 10 psi for now.

 

when you need more fuel you have two options:

1) raise fuel pressure
2) use larger injectors

1 is hard on the injectors and is difficult to tun precisely. 2 is easier on injectors because you use the stock fuel pressure. you also have more control over fueling because the idea is use bigger injectors then subtract fuel via the computer or hack.

 

so will putting in the bigger injectors raise or lower the fuel pressure? will i need an adj fpr?

 

the fpr controls the pressure, but larger injectors can cause a pressure drop if the pump cannot deliver the volume required, also the rail, too.

 

i have the stock fpr, aem fuel rail and a walbro intank 255lph fuel pump.

will i need an adj fpr? with stock injectors right now and the fuel pump, my fuel pressure is a little high at idle. i was hoping the 310cc injectors would drop the fuel pressure some.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93hb &raquo;</TD></TR><TR><TD CLASS="quote">i have the stock fpr, aem fuel rail and a walbro intank 255lph fuel pump.

will i need an adj fpr? with stock injectors right now and the fuel pump, my fuel pressure is a little high at idle. i was hoping the 310cc injectors would drop the fuel pressure some. </TD></TR></TABLE>

What else do you have for fuel management? fmu?????
the larger injectors won't drop the fuel alone.

 

unfortunately for now i have a vortec fmu.

 

well you should be able to lower the fmu ratio from a 12:1 down to a 6:1 or 8:1...
vortec recomends 6:1.
I'm also runing 310cc injectors and a fmu (but a little different set-up)

 

my fmu is a 10:1

how many lbs of boost are you running? i want to run 10lbs...max

 

Get an inline fuel pump, Get an inline Fuel pump, Get an inline fuel pump........

 

I wouldn't recomend 10psi with that set-up. 8psi maybe...
I'm runing .65 bar but i'm also only runing a 4:1 fmu so my fuel pressure never exceeds 85psi.....

 

i am running 8psi right now with no problems at all.

 

what size injectors would you use running 12 psi on a gsr motor??

 

psi on a motor doesn't determine what size of injectors you need. For examples, 12 psi on one motor will yield 360hp and other only 300hp. Injectors are determined by a targeted hp. Just get a hondata and 720cc injectors. 720cc will give you 450hp. More than enough for your street car.