im turboing my s4 n/a...??? i thought i read somewhere that the voltage will be ok under idle and heavy load.is the rewire needed? not sure about voltage statement, someone please help...

 

I am not overly sure that the existing pump can supply enough fuel for a boosted application. Now thats not a proven statement, but that N/A pump is pretty weak.

 

Don't be cheap and buy a new fuel pump.

 

na fuel pump and injectors are probably good for up to about 200 hp at the flywheel or 180hp at the wheels, after that your car will be running lean and with a turbo setup you will definitely be running more than 180whp.

unless youre running only like 4-6 psi and thats it and the engine is completely stock it will be around 180whp, even then youll still needa fuel controller so it doesnt run like crap, not to mention a turbo with only 180whp isnt very much considering my n/a should be close to that with and exhaust and fuel controller

i would say get bigger injectors, at least 550ccs all around or 550cc primary 650cc secondaries or whatever

there is alot more stuff that you need other than a fuel setup believe me i looked into it and the price for a reliable setup is very expensive

 

well considering im running a fd fuel pump, 550 primaries, 720 secondaries, and a safcII and wideband i think i should way more than enough fuel for 8-10 lbs. of boost, prob. woulda helped if i threw that in there huh....

 

its not that expenxive with a little patience and good finds on the forum

 

I would say, definintely do the rewire. Your fuel setup sounds pretty solid to me.

 

The S4 NA doesn't have the relay/resistor for the 2-speed pump system that other FC's have, so the rewire is very easy. Use 12GA wire to feed the pump directly from the battery via a fuse and relay, and switch the relay using the original fuel pump wires.

 

What turbo do you plan to run? Stock s4 turbo?

 

This is fine. I ran basically the same setup (with 550CC secondaries) and didn't rewire the pump.

 

yeppers!!! soon to be ported to hell for boost creep!!!well considering the choices i had by the help im really not that concerned about the rewire, maybe thatll be another day when i get new carpet....thanks for the great info though, this page will be saved...

 

Good luck with your project.