I have an 05 GTO with a 402 twin turbo. I'm trying to get the car up and running and of course the stock tune won't run, too rich since the injector is over twice the size. So I found this chart from someone here:
http://www.allmod.net/hpt/injectors.xls
Plugged in my 75# @ 43.5 psi with the GTO's 58 psi fp and transferred the grams/sec numbers into the stock tune. It seemed worse, definitely won't idle.
I now have been told by Ken that GM doesn't allow over 63.5# injectors in their code, so is there something else to tweak to get it right? Also, the engine is a 402, so I'm sure the displacement needs to be changed, I'll need to find that.
Jody