Fuel Pump Sizing
Fuel Pump Sizing Hey guys i just had to verify that my thinking is correct when it comes to sizing a fuel pump. If anyone can chime in and let me know if i am on the right track or am completely off base i would appreciate it. My reply that i am pasting was in response to sizing a fuel pump on a maggied GTO.
BSFC being different on FI cars compared to N20 cars.
"True, but N2O cars are famous for putting a high demand on the fuel pump at the begining of the shot, at least with a wet kit. Boost comes on gradually rather then an instant shot of 100hp and tq making it easier for the fuel pump to maintain the desired pressure.
BSFC on boosted motors is usually agreed to be around .55-.65 lb/hp/hr.
BSFC on nitrous motors can be as high as .7 lb/hp/hr, it is usually accepted that nitrous motors are much harder on fuel systems then boosted motors, i was just stating that mine is working and hoping that it would help the OP in his search for getting a system that would work for his.
Doing the math - 484rwhp + 16%(accounting for drivetrain loss) = approx. 560bhp
560bhp*.6BSFC = 336lbs/hr
Gasoline weighs 6.2lbs/gal so...
336lbs/6.2lbs = 54.19gal/hr convert now to GPM
54.19/60 = .903 Gallons Per Minute - Your fuel pump needs to flow that much to support your power levels.
I think that most pumps are rated in liters/hr so to convert the 55 gal/hr to liters....
3.79 liters/gallon so.. 55*3.79 = 208.45
Hence the reason why most people on this forum go with the walboro 255 @ 255 liters/hr."
"On a nitrous motor making the same power:
560bhp*.7BSFC = 392lbs/hr
392/6.2 = 63.23
63.23/60 = 1.054 GPM
63.23*3.79 = 239.64 liters/hour to support the same hp but on a nitrous motor.
To the original poster, i would look for something that will flow in the area of 255 lph at our rated fuel pressure, which on GM vehicles is between 58-62 psi i believe. The boost a pump would be a good back up to make sure that the pump keeps up as demand is increased with increasing boost.
In other words, an LPE or Walboro 255 and a boost a pump and you should be more then set!"
I am being told that FI is harder on a fuel system, but have always gone with nitrus and its instant demand as being harder on a fuel system. Anyone wanna back me up wither way on this?
Thanks,
Anthony
BSFC being different on FI cars compared to N20 cars.
"True, but N2O cars are famous for putting a high demand on the fuel pump at the begining of the shot, at least with a wet kit. Boost comes on gradually rather then an instant shot of 100hp and tq making it easier for the fuel pump to maintain the desired pressure.
BSFC on boosted motors is usually agreed to be around .55-.65 lb/hp/hr.
BSFC on nitrous motors can be as high as .7 lb/hp/hr, it is usually accepted that nitrous motors are much harder on fuel systems then boosted motors, i was just stating that mine is working and hoping that it would help the OP in his search for getting a system that would work for his.
Doing the math - 484rwhp + 16%(accounting for drivetrain loss) = approx. 560bhp
560bhp*.6BSFC = 336lbs/hr
Gasoline weighs 6.2lbs/gal so...
336lbs/6.2lbs = 54.19gal/hr convert now to GPM
54.19/60 = .903 Gallons Per Minute - Your fuel pump needs to flow that much to support your power levels.
I think that most pumps are rated in liters/hr so to convert the 55 gal/hr to liters....
3.79 liters/gallon so.. 55*3.79 = 208.45
Hence the reason why most people on this forum go with the walboro 255 @ 255 liters/hr."
"On a nitrous motor making the same power:
560bhp*.7BSFC = 392lbs/hr
392/6.2 = 63.23
63.23/60 = 1.054 GPM
63.23*3.79 = 239.64 liters/hour to support the same hp but on a nitrous motor.
To the original poster, i would look for something that will flow in the area of 255 lph at our rated fuel pressure, which on GM vehicles is between 58-62 psi i believe. The boost a pump would be a good back up to make sure that the pump keeps up as demand is increased with increasing boost.
In other words, an LPE or Walboro 255 and a boost a pump and you should be more then set!"
I am being told that FI is harder on a fuel system, but have always gone with nitrus and its instant demand as being harder on a fuel system. Anyone wanna back me up wither way on this?
Thanks,
Anthony
From what I learned is that nitrous loves to dip the fuel pressure when it first hit's which causes a lean spot unless you run dual pumps. The best system is the standalone fuel system.Adjustability just for N2O and you can run C-16 in it for some extra insurance.
