hello, , I was thinking of possably using 80 or 90 lb injectors in my crossfire injection.--- Do you think thats def to big ???? or may work. ---Im a 355 eng,-- eldebrock tubular headers,--- 3 inch exaust,, No cat conv,,---ported intake,,- 2 inch t/bodys.-- Pro Topline, Pro lightning cast heads,, - P.S. i USE tuner pro to tune with the prominator .

 

check this out:

http://www.users.bigpond.net.au/ben_...ctorsizing.xls

I would consider about 25-30 lbs might be max on injector FP. Maybe others ran them higher. your duty cycle in log will determine if you need higher FP or larger injectors. I would keep cranking up your current ones and see how it responds B4 investing the $$$.

 

read this
http://www.megamanual.com/v22manual/minj.htm

 

The only reason to run 80-90lb injectors is if you are going to be above 350hp. You can increase your fuel pressure (assuming you have a nice pump, regulator spring, etc) to make your current injectors flow at a higher rate to support your hp. An example... 65lb injector flowing at 29psi will handle 370hp. 90lb injectors flowing at 16psi will handle about 365hp. So, it all depends on what you want to do.

What are the injector ratings on the crossfire systems? I know the front and rear injectors are different.

If you need gasket/o-ring kits for your crossfire or IAC Valves, throttle position sensors let me know.