Originally posted by SVT_AJ:
stock SVT injectors and fuel pump are suposed to handle 330hp n/a and 300hp forced induction.


19lb injectors with an FPR or FMU (that would be return style) can "technically" see that much power at the crank. However the fuel system pressure would be out the door and injector spray pattern so several degraded that random lean spots would be prevalent every where in the power curve. This is a very stupid way to try and regulate fuel.

19lb injectors in a returnless system can handle about 225-240 FWHP. Though with a bad tendency to lean out in the upper rpm levels.

A safe number for both systems is ~225-230FWHP. Making power above that level would really require running a larger injector to keep the duty cycle within sane levels and the injector spray pattern and longevity good.


Now the fuel pumps are reversed. The stock return style can support about 240-250FWHP while a stock returnless can support almost 300FWHP. However the returnless is hampered by a terrible lower pickup filter and has been known to cause random lean spots and early failure.

The best option for a returnless car is to run the variable rate returnless SVT Focus pump. (255 l/hr and only ~$85 ) Also DO NOT put the bottom pickup filter back on!

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.