Originally Posted by GretchenGotGrowl
We've seen two things happen with the rail pressure. The first is just like all the others that the tuner has seen...at middle RPMs the fuel pressure drops too low. The second scenario happens when he tries to compenstate for that...we see the overall flow drop to low at the higher RPMs.
Ok well that settles it then. You're running out of volume on the high pressure pump. They can be modified, check out what the 2.0FSI guys were doing with them.
However I think it's better to run the port fuel on top of it for many many reasons, namely improved upgrade path, and reliability. Even if it complicates things a bit.