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.

 

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

 

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

 

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

 

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

 

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

 

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.

 

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