[DeTomaso] Any DC motor controller guys out there?

[Ken Green]

Dave,
   
      Regarding failures, a system designed to need two pumps at peak HP has twice the failure modes, so I'm  not sure that's any better than one pump and a controller..  
   
      I originally thought I had the right pump and nozzles because it was a "800 HP" pump.  Then I took the fine print seriously, which said "up to 800 HP".  but that was normally aspirated with something like 43 pounds in the fuel rails.  So I did the math, and observed that at 12 pounds boost to pump against and a base pressure of 60 PSI I was planning with the nozzles I had, my 800 HP pump, pumping against 72 PSI, was maybe a 500 HP pump.  The big error I might have made really got my attention as thoughts of lean mixture at max RPM and power melting pistons floated across my thoughts.  Then I finally understood why a 1500 HP pump with normally aspirated carbs was only a 800 HP pump with a supercharged EFI motor.
   
      I bought an Aeromotive Eliminator pump and Pro Series regulator and bigger injectors, and it all looked cool, but I fell into a killer deal on an Aeromotive Pro Series pump which leads to the present dilemma.  I have however gotten the story from the Aeromotive tech line late today that the fuel pump controller made for use with the Eliminator or Pro Series is indeed a pulse width modulation (thank you JG) device and may make it all fine.  I'll go through the math again with reasonable worst case assumptions and see if I really need the bigger pump, but it was such a good deal that I can unload it any time.
   
     As far as pump reliability, just about everyone seems to use the Aeromotive pumps with their high HP EFI systems, often with their name on it.  I'm sure the Bosch pump is high quality and reliable, but I'd be really careful about using in on a turbocharged engine with much boost and base pressure.  It may not be an 800 HP pump under those conditions.
   
  Ken
   
  

Dave Doddek <pantera at pobox.com> wrote:
  My first idea would be to get another pump that can connect to 12v
directly. Any EFI system of the older style anyway, will use a bypass
regulator to return excess fuel to the tank. You can run as big a pump as
you want as long as the lines and regulator can handle it. I would not
want a pump that needed a controller. That is just extra electonics to
fail. If you have to, run dual parallel pumps to get the needed flow. I
use a single Bosch pump and it supports 800 hp. If you need more, then you
can run two of these. And since the Bosch is an OEM pump and not some
custom billit, it would be more reliable, cheaper, and can buy one at any
auto parts store. Or better yet, modify your gas tank with a larger
opening on the top and run two internal 255 lph pumps from a mustang.
These are dirt cheap and dead reliable.

Dave "I like reliable" D

At 02:05 PM 10/9/2007 -0700, you wrote:
>I bought a mondo electric fuel pump and would like to run an open loop
control using my ECU. I'll still have a fuel pressure regulator, so I just
need to have more gas pumped than I need. I asked Aeromotive, and all they
would say was that if you drop the voltage below 12 volts, the current will
rise and cook the wires and the motor. They do make a solid state
controller, but it's pretty much a black box.
> 
> I assume there are ways to provide power to the motor to control it to
some extent because Aeromotive makes the controllers for their larger pumps. 
> 
> This particular pump can not (according to Aeromotive) be continiously
operated at full power.
> 
> Any suggestions?
> 
> thanks,
> 
> Ken
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