As odd as it sounds, it would be nice to see this thread in the HYBRIDS section too. ALOT of smart and helpful guys there.

 

 

 

I run a Whipple on my ly6 . 65 lbs injectors. I run a single walbro 450 with a return style fuel system. I wouldn't skimp on the fuel system if I were you. Boost is addicting and that ly6 can take 10-12lbs all day long. Run a single 450 and add a return line. Put the regulator after the rails on return side. This way the injectors get the full volume of fuel.

 

"It’s orginally a flex fuel so I’ve read a couple places where the flex fuel pump should be enough for runnig 8psi boost or below. Is this true?"
Without knowing the actual flowrate vs. pressure it's not easy to determine if it's even in the ballpark. What many do is run the pump on the new engine and hope for the best. What a few do is monitor fuel pressure and see if the pump can keep up with engine demand. Perhaps somewhere out there the same pump that is in your truck has been flow tested and a graph is available.

"Is the stock flex fuel FPCM something that can be used to properly supply fuel to my blower? As of now I don’t know If I need to keep the stock returnless fuel system and dead head the LSA fuel rail with a aeromotive fuel pressure regulator before it."
That would be a double pressure regulation system, something that should be avoided. The OEM FSCM is an electronic pressure regulation system. Adding another pressure regulator, a deadhead Aeromotive mechanical part, is not only redundant but will likely cause problems. When two pressure regulators are in the same system and have the same operating pressure, which one wins? Also, the FSCM is pressure sensor based, so if the fuel pressure is changed via the mechanical regulator, the FSCM may be trying to increase pressure but cannot due to the mechanical regulator.

"If the stock FPCM won’t do the job then I’ve heard of people over on the G8 forums using the VaporWorx PWMs."
The VaporWorx PWM will not increase pump output. A pump with insufficient capacity can supplemented by adding a voltage booster or putting in a bigger pump. Installing a larger pump into modern fuel modules is usually not an easy task. The VaporWorx controller can accept up to 22v of input voltage.

"Other options are using a boost a pump on my stock fuel pump."
To a point. Many OE FSCM's get pretty unhappy over 16.5volts and will start to throw MIL codes.

 

Another thing to think of is the front drive as an ly6 is a vvt motor and uses truck spacing . You would have to do a vvt delete.