Fuel Pump=Horsepower
12-02-2008, 09:11 PM
#1
Racer
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Fuel Pump=Horsepower
Does anyone have any acurate info on how much horsepower can be
had out of a mid to late 80's fuel pump? And which one is the best
to step up to?
had out of a mid to late 80's fuel pump? And which one is the best
to step up to?
12-02-2008, 10:11 PM
#3
Safety Car
So long as there's nothing wrong with your current fuel pump, there's no HP to be had. If your engine can only use a certain amount of fuel, there's no use in being able to flow more than that...
12-02-2008, 10:15 PM
#4
Le Mans Master
The fuel pump will not create HP. It could limit (lean out the fuel delivery) if the pump is too small for the application. The stock pump on a 1985 can support up to about 400 HP.
12-02-2008, 10:43 PM
#5
Le Mans Master
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Fuel pumps are rated as to how much fuel they will flow @ X psi which equates to supporting a certain maximum HP in relation to the available fuel.
The Aeromotive ,#11109 inline pump is good for 500Hp ;
Flows 325 lbs. per hour @ 13.5 Volts and 45 PSI.
The Aeromotive 11101 is good for 1300Hp ;
Flows 700 lbs/hr @ 45 PSI and 13.5V.
If you check the flow v Volts chart there is a big flow drop as voltage drops
http://www.tunertools.com/prodimages...hart_large.jpg
which is why people use aftermarket kits to supply 12V power direct to pump
The Aeromotive ,#11109 inline pump is good for 500Hp ;
Flows 325 lbs. per hour @ 13.5 Volts and 45 PSI.
The Aeromotive 11101 is good for 1300Hp ;
Flows 700 lbs/hr @ 45 PSI and 13.5V.
If you check the flow v Volts chart there is a big flow drop as voltage drops
http://www.tunertools.com/prodimages...hart_large.jpg
which is why people use aftermarket kits to supply 12V power direct to pump
12-04-2008, 12:41 AM
#8
Racer
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Your fuel pressure doesn't have to fall off. Even at the proper pressure, at a certain point
a pump is only going to supply enough fuel for x amount of h.p. I'm just wanting to know
how much h.p. is that for a stock pump?
a pump is only going to supply enough fuel for x amount of h.p. I'm just wanting to know
how much h.p. is that for a stock pump?
12-04-2008, 07:12 AM
#9
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Hmm. If you're going to use the fuel pump to power something up just with the gasoline flow, you can calculate the hp it produces like this. first measure the current draw, it could be something like 5A. So with 14 volts that means 70 watts. Lets say it's not that efficient so roughly it could output 40w in kinetic energy.
One watt is 0.00134 horsepower so we are talking like 0,05 horsepower here. So it's for small applications only. Hope this helps.
One watt is 0.00134 horsepower so we are talking like 0,05 horsepower here. So it's for small applications only. Hope this helps.
Last edited by Mr X; 12-04-2008 at 07:14 AM.
12-04-2008, 07:33 AM
#10
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The only time I had my car on a dyno, the stock pump was not enough. I had a FP guage in my hand and as the RPM climbed the pressure dropped off. Wideband got lean readings. This was at about 275 rwhp I think. Its been a few years.
12-04-2008, 08:12 AM
#11
Safety Car
I agree, my stock fuel pump started dropping below 42PSI at 275 RWHP or around 340 engine HP.
12-04-2008, 08:35 PM
#12
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Some pump ratings are here (when in NEW condition):
http://www.gnttype.org/techarea/fuelsystem/pmprate.html
Some relative HP/gph estimates are here:
http://www.gnttype.org/techarea/misc/lubrant.html
Some pressure drop vs line size info is here:
http://www.gnttype.org/techarea/fuel...nearticle.html
http://www.gnttype.org/techarea/fuelsystem/pmprate.html
Some relative HP/gph estimates are here:
http://www.gnttype.org/techarea/misc/lubrant.html
Some pressure drop vs line size info is here:
http://www.gnttype.org/techarea/fuel...nearticle.html
12-04-2008, 09:04 PM
#13
Max G’s
Fuel Pump HP
Fuel pumps are rated as to how much fuel they will flow @ X psi which equates to supporting a certain maximum HP in relation to the available fuel.
The Aeromotive ,#11109 inline pump is good for 500Hp ;
Flows 325 lbs. per hour @ 13.5 Volts and 45 PSI.
The Aeromotive 11101 is good for 1300Hp ;
Flows 700 lbs/hr @ 45 PSI and 13.5V.
If you check the flow v Volts chart there is a big flow drop as voltage drops
http://www.tunertools.com/prodimages...hart_large.jpg
which is why people use aftermarket kits to supply 12V power direct to pump
The Aeromotive ,#11109 inline pump is good for 500Hp ;
Flows 325 lbs. per hour @ 13.5 Volts and 45 PSI.
The Aeromotive 11101 is good for 1300Hp ;
Flows 700 lbs/hr @ 45 PSI and 13.5V.
If you check the flow v Volts chart there is a big flow drop as voltage drops
http://www.tunertools.com/prodimages...hart_large.jpg
which is why people use aftermarket kits to supply 12V power direct to pump
Here is the answer to your question.
12-05-2008, 09:40 AM
#15
Melting Slicks
The first thing that happens when supplied volume does not meet demand is a drop in pressure.
12-05-2008, 05:13 PM
#16
Race Director
My fuel pump was testing sat IAC FSM and during highway driving; but during data logging the injectors were maxing out on the duty cycle. My tuner suggested I get a fuel pressure reading on the top of third (4l60e) and sure enough fuel pressure was dropping lower than GM stock(fuel pressure read OK in first and second).
I stepped up to a wahlbro kit from racetronix my fuel pressure is fine even with my foot on the firewall.
http://www.racetronix.com/RX-C44-FPKG-2.html
Last edited by aboatguy; 12-05-2008 at 05:24 PM.
12-05-2008, 05:43 PM
#17
Safety Car
good luck !
12-08-2008, 11:30 PM
#19
Racer
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Today enough of the snow has melted and the streets dry enough. With the gauge hooked
up and pressure set a 50 psi with hose disco'd and at 46 with it back on, I went for a spin.
Second gear wot it dropped like a rock to 35-36 psi. I'll change the filter since it's easy and cheap to do, but I think it's pump time.
up and pressure set a 50 psi with hose disco'd and at 46 with it back on, I went for a spin.
Second gear wot it dropped like a rock to 35-36 psi. I'll change the filter since it's easy and cheap to do, but I think it's pump time.
12-09-2008, 07:08 AM
#20
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Today enough of the snow has melted and the streets dry enough. With the gauge hooked
up and pressure set a 50 psi with hose disco'd and at 46 with it back on, I went for a spin.
Second gear wot it dropped like a rock to 35-36 psi. I'll change the filter since it's easy and cheap to do, but I think it's pump time.
up and pressure set a 50 psi with hose disco'd and at 46 with it back on, I went for a spin.
Second gear wot it dropped like a rock to 35-36 psi. I'll change the filter since it's easy and cheap to do, but I think it's pump time.
Yes, its pump time. On my 87 the Walbro was a direct replacement. Plug and play.
