Quote:
Originally Posted by AOlson
One way to verify your theory is to either log fuel pressure if you have a sending unit, or just video your fuel pressure gauge while on the dyno. You'll see if your pump can't keep up.
Just as a data point, I too am running the 044 pump with the stock in-tank pump. With the 42lb injectors at 80% duty cycle, and fuel pressure running at 45psi idle - 65psi max RPM, I have not experienced any drop off on fuel pressure.
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(please excuse my drag race car comparison, but I think it is fairly relevant)
you can also use the Barry Grant 1 gallon fuel can test:
on his website, in the technical discussions, you will find the fuel can test. he describes the test as the time it takes for your pump to fill a one gallon gas can. there are several time/fill targets listed on a chart, so there should be a way to compare to what you are trying to achieve here (preventing fuel starvation under hard acceleration).
ex: a 10 second 1/4 mile car needs to fill a 1 gallon can in 25 seconds.
this corresponds to approximately 600 hp to make a 3500lbs car run in the tens, necessitating a fuel rate of 300 lbs of fuel per hour.
this is a cheap test to perform without getting into some really expensive equipment, and the results should show if your fuel delivery system is up to the task.
with this in mind, you can eliminate the in-tank pump, use AN #10 line from the tank to filter to BG "King Sumo" pump, then AN #10 line to the regulator and then even just AN #8 line for return to tank. from the regulator you could use the standard lines to the injector rails/lines.
If this set up will faithfully feed a 1500hp Pro Stock engine, with all of the G-forces involved in zero to over 200mph in less than 7 seconds, there's plenty enough to feed a 600hp 928 motor......
It's not all about pressure, it's about volume as well.
here's the link for you to reference:
http://www.barrygrant.com/bgfuel/default.aspx?page=81
--Russ