Originally Posted by HDDP
I must say, they have a HUGE flow difference from the NA engine and now I have to figure out how the SC engine is regulating the flow, whether by pulse width or pressure regulator.
If you check the HP per injector rating the stock is barely able to do 215 hp, but 50 lb on 6 injectors is good for over 400 hp!
I take it you mean is the SRT fuel pressure adjusted to accommodate the boost pressure? If those flow figures are right I would be looking for a fuel pressure regulator with a manifold "vacuum" pickup. I would say the fuel pressure at idle / no boost has to be much lower than 55 psi or it wouldn't be possible to make the injector duration short enough to have control of low fuel inputs, opening times of 1 ms don't work well.
Reducing fuel pressure with a high manifold vacuum also leaves some headroom to increase the pressure as the boost comes it - without needing a new pump and further increasing an already high fuel pressure.
If I had time I would put a scope on an injector - problem is I have hardly seen the Crossfire in two weeks because work is so busy.