5th injector

[David A. Cooley]

>
> Since there is no way to adjust the fuel flow of my second cold start
valve
> other than when the fuel pressure increases (despite that it's still not
> spraying enough fuel at 7 pounds of boost), I have been thinking of
> replacing it with an actual fuel injector from the same system.
>
> Then controlling the pulse rate using a 555 timer IC and a potentiomter.
> Then I can control the pulse rate from the dash.
>
> I think 555 is right, it's been awhile since my college days.
>
> The injectors used in the Bosch L-jetronic system should operate at 4
> volts. I think. I don't know of any voltage regulators that would step
down
> the voltage to 4 volts. I suppose I could use a regulator that steps the
> voltage down to 5 volts and install a resistor to bring it down an extra
volt.

Why would the injector be run at 4 volts?  I've only seen BOSCH and other
injectors that were made for 12 volts.  The ECM usually just grounds one
side to turn it on and the other side goes to 12 volts when the key is on.

Best bet is have it pulse at a specific rate, but adjust the Pulse width as
boost increases.