Fuel pump amperage draw?

Adger Smith · 10-27-2011, 01:57 PM

Art,
What you might need is a step up in your electrical system.
There are a few systems available. I would give Pat Collins a call @ http://www.techwestracing.com/
704-995-4286
I got a well known Comp team hooked up with him and he helped their program. I can tell you first hand that his Max Power system made more power on a dyno I am associated with than just a good 12 volt battery with a charger attached. That was with a MSD 7 system and the appropriate coil. Listen to him when he talks about coils.

Also, I agree with Jim about the correct sizing of the fuel system. The bigger is better way is similar to what I call the "Shotgun Way" Throw enough lead at anything and you will eventually hit it. You need big enough, but too big has some problems like air in the system and heat soak. Plus a few other issues.

Ed Wright · 10-27-2011, 02:50 PM

The voltage compensation table is to correct injector pulse width, but that has much more effect at lower RPM, not so much at higher RPM. Adjust that table at one RPM and you won't see the same A/F change at all RPM. More low, less up high. The correct way to address it is upgrading the electrical system to stabalize the voltage. EFI cars, IMHO, should have 2 16 volt batteries or an alternator if 12 volts. Low voltage will certainly lean an EFI car because the injectors open slower. I had two 12 volt batteries with an alternator in mine, everything was fine until it suddenly began to kick alternator belts off. I could kiss about .05 worth of ET goodbye when it did that.

Mike Pearson · 10-27-2011, 04:26 PM

Why not run a separate battery just for the engine controls?

10-27-2011, 01:57 PM	#1
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Fuel pump amperage draw? Art, What you might need is a step up in your electrical system. There are a few systems available. I would give Pat Collins a call @ http://www.techwestracing.com/ 704-995-4286 I got a well known Comp team hooked up with him and he helped their program. I can tell you first hand that his Max Power system made more power on a dyno I am associated with than just a good 12 volt battery with a charger attached. That was with a MSD 7 system and the appropriate coil. Listen to him when he talks about coils. Also, I agree with Jim about the correct sizing of the fuel system. The bigger is better way is similar to what I call the "Shotgun Way" Throw enough lead at anything and you will eventually hit it. You need big enough, but too big has some problems like air in the system and heat soak. Plus a few other issues. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 10-27-2011 at 02:07 PM. Reason: sp & addition

10-27-2011, 02:50 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Fuel pump amperage draw? The voltage compensation table is to correct injector pulse width, but that has much more effect at lower RPM, not so much at higher RPM. Adjust that table at one RPM and you won't see the same A/F change at all RPM. More low, less up high. The correct way to address it is upgrading the electrical system to stabalize the voltage. EFI cars, IMHO, should have 2 16 volt batteries or an alternator if 12 volts. Low voltage will certainly lean an EFI car because the injectors open slower. I had two 12 volt batteries with an alternator in mine, everything was fine until it suddenly began to kick alternator belts off. I could kiss about .05 worth of ET goodbye when it did that. __________________ Ed Wright 4156 SS/JA

10-27-2011, 04:26 PM	#3
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,460 Likes: 620 Liked 1,946 Times in 587 Posts	Re: Fuel pump amperage draw? Why not run a separate battery just for the engine controls? __________________ Mike Pearson 2485 SS