[Diy_efi] Donegan ECU

[Mike]

Safety would be a huge issue, fuel return is safer and
works well - other than a trim on the fuel pressure regulator
why mess with it ?

Mike


At 07:54 AM 1/11/07, you wrote:
>--- John Gross <jogross3 at hotmail.com> wrote:
>
>> If your PWM idea is designed around saving the pump
>> over time to make it last longer, what you can do
>> if you so choose is to use the mechanical regulator
>> to help you set your operating fuel pressure.  At
>> different load conditions, you can adjust the PWM
>> control on the fuel pump and back the pump down
>> until your pressure starts to drop. 
>
>It strikes me that there is a great way of combining
>all these ideas in a vehicle that does not require use
>of leg-room for a passenger (i.e., a dedicated race
>vehicle).
>
>If you were to use a low-pressure, high-flow pump
>inside the main fuel tank that fed a large surge tank
>in the passenger footwell, perhaps 4-5 L or so, and a
>higher-flow pump feeding a very short line to the fuel
>rail, this one PWM controlled via the ECU.  This would
>make for an especially rapid feedback loop, and would
>keep the majority of the fuel in the main tank in the
>rear.  The fuel in the "surge tank" could be
>constantly cycled by the low-pressure pump in the
>tank, and as an added extra, you could quickly rule
>out failuers caused by running out of fuel or the
>low-pressure pump or lines failing, merely by
>observing the level of the "surge" tank from the
>driver's seat.
>
>Just a thought, but one that might make such a system
>much more viable in a practical sense, especially in
>terms of the ECU making changes to fuel volume
>delivery quickly enough to prevent the need for
>special compensations in "accelerator pump shot" calculations.
>
>| Kawasaki Zephyr 615 (Daphne)       Kawasaki Zephyr 550 (Velma)|
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>|   didn't matter what race or class the victims belonged to.   |
>|  They were all given the same miracle drug, which was coffee. |
>|   The catastrophe in this case, of course, was that the sun   |
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>
>
> 
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Regards from


Mike
Perth, Western Australia
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