[Diy_efi] Fuel Pump speed controller

[Greg Hermann]

At 12:40 AM 8/4/02, Scott F. Williams wrote:
>Please educate me as to why you'd want to control the speed/output of the
>fuel pump. Isn't the fuel pressure regulator the proper way to control the
>pressure to the fuel rail, etc? I'm obviously missing something here...
>--
>Scott F. Williams

If he's talking about a non-return fuel system, would be one reason, but
that is really a dumb design for performance use.

A better reason is that two controls over a variable will give a MUCH
tighter, more accurate control over the controlled variable--in this case
fuel rail pressure.

Kind of like the way heavy trucks use a thermostat AND (sometimes) radiator
shutters AND (occasionally) a variable pitch cooling fan to control coolant
temp.

Greg




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