im running a holley 12-903 fuel pump. It is a GM universal unit that i used to run in my Grand Nationals. I happened to find out it is a walbro 255, non high pressure unit. The graph that comes with the pump shows that at 80 psi, it will flow 30 gph at 12 volts. At 13.5 volts, pumps flow quite a bit more.
At 90 psi, it flows zero!
At 60psi it flows about 50 gph.
30 gph is 30 times 6 pounds per gallon of gasoline equals 180 pounds of fuel, which at .5 bsfc is 360 hp. somewhat less on a turbo motor with .6 bsfc.
50 gph is around 600 hp.
0 gph at 90 is zero hp.
Just thought i would pass that on, to be carefull to find out what your pump flows at the higher pressures.
When i found this out, i put bigger injectors in so I could run lower fuel pressures.
At 90 psi, it flows zero!
At 60psi it flows about 50 gph.
30 gph is 30 times 6 pounds per gallon of gasoline equals 180 pounds of fuel, which at .5 bsfc is 360 hp. somewhat less on a turbo motor with .6 bsfc.
50 gph is around 600 hp.
0 gph at 90 is zero hp.
Just thought i would pass that on, to be carefull to find out what your pump flows at the higher pressures.
When i found this out, i put bigger injectors in so I could run lower fuel pressures.
