snakeeater

Unfortunately you can't run a boost reference line to the FPR since it's now in the fuel tank. So the fuel pressure regulator (insulated from boost reference signal due to its location) cannot give more fuel pressure under boost. That means that the pressure differential across the injector's nozzle (between fuel rail and intake manifold) is dropping 1psi forevery 1psi boost rises.

At some point in the diminishing fuel pressure (relative to manifold absolute or MAP pressure) the spray pattern on the injector will fall apart. The injector requires a certain amount of DP (45 psi) across the nozzle in order to create a fine mist. If the DP gets too low, large drops of fuel go to combustion chamber and slow down combustion rate. So even with upgrade to high flow fuel pump and/or larger injectors, the lack of adjustment in the FPR to rise with boost pressure will limit operation.

2QYK4U

Thanks for the outstanding explanation. When I have the system converted to a return fuel system, some sort of line will be ran from the aftermarket fuel rail to somewhere in the tank. Do you know where in the tank that line would be connnected to?

Boofster

You'll have to run a vacuum line to the FPR as well no? Unless you just relocate it to the usual spot on the front rail which sounds easier. But running a fuel line all the way to the back sounds like a lot of work.

I wish I had went to SEMA to see how the Greddy turbo car was setup in this respect.

2QYK4U

The stock FPR will be removed from the fuel tank and an aftermarket FPR will be used and placed somewhere in the engine bay.

Boofster

Right but the fuel return line that will come off your new FPR up front will need to be routed all the way under the car and back to the tank no? Maybe the an earlier model fuel line would work hmm...

2QYK4U

That is the line I was referring to a few posts back. I was asking where in the fuel tank that line will need to go. Go idea on the PY fuel line possibility.

OGPackin

InlinePro will be coming out with their own fuel rail soon....

2QYK4U

Here is a fuel diagram for the MY05:



Here is a fuel diagram for the MY06:



As you can see a whole lot has changed. I don't think we could simply swap the fuel lines (#19 for MY05 and #17 for MY06).

Boofster

From looking at that, it seems you want to add line #28 and just T into B-3-1. I'm going to go read my Helms when I get home. It would probably be easier to run a ss line.

2QYK4U

Did you get a chance to look at the manual?