sinful7

iTrader: (1)

Whats the horse power limits of these injectors using the stock fuel rails on a ls1, given its a boosted motor, stock fp is at 58psi, and has a 1:1 rising rate regulator? I am hoping these will support 650whp given proper fuel pump. can anyone give me a good idea? I know they are 42pound injectors but thats on fords, we use more fuel pressure so arnt they more like 48 pounders? excuse my ignorance.

FICINJECTORS

iTrader: (30)

not going to work.. you need 60 at 3bar injectors. Call me I will take the 42's in on trade against new 60's

n20kid

iTrader: (6)

Get the 60's, u will need them! and they will leave u a little room too..

sinful7

iTrader: (1)

what are the limits of the 42's then? just out of couriousity. and as soon as I up the boost, I will pm you and get some 60's

camz28arro

iTrader: (12)

42# injectors should be able to support 575-600rwhp so you'll need bigger ones for that power.

sinful7

iTrader: (1)

ahh well thats not too bad really. as soon as I get everything ready ill run some #60's when i eclipse the 550whp mark

TWS

iTrader: (63)

Depends on your setup. On my Procharged, stock motored '02 Z28 the 42# green tops hit 100% duty cycle at 5300 RPM when I pullied up for 10 psi of boost. It only put down 542 RWHP due to running out of injector. I have installed Siemens Deka 60# injectors and am upgrading the fuel pump to match. Going back to the dyno soon, but am sure the Siemens injectors have given me the room I needed.

boosted LT1

iTrader: (3)

Here is a calculator for size of injector versus fuel pressure

http://www.csgnetwork.com/fiflowcalc.html

My experience the 42's won't get you beyond 500 but as stated each system seems different