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I'm just going to sum up what I have been told. The LT direct injection motors have 2 fuel pump systems, first is the electric in the trunk and second is a mechanical that is driven off the cam. I have been told that if you take a stock LT1 and upgrade the mechanical pump and injectors to the LT4 system it will make about 100 more horsepower without changing the electrical pump in the tank. I have also seen first hand on my car that leaving the mechanical pump stock and adding a bigger electrical pump in the tank will give about 100 horsepower. Supposedly if you change both the mechanical and electrical then you finally will get to the power limitations of the turbo/supercharger.... Give or take, I still do not think anyone has over about 1200 with an LT motor because that is all the fuel you can get in there with the current technology.
That makes perfect sense and was what I was looking for. Thanks.
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