Wierd application, hypothetical question.

[Shirley, Mark R]

Hope you guys can help.  This is gonna sound wierd, but here goes.

I have a small 4cylinder diesel engine (not VW) that I am going to
turbocharge.
The engine was never available turbocharged, so there's no way to use the
stock
fuel pump for boost enrichment.  As anybody who's familiar with diesels
knows,
there's a fuel screw on the side of the pump that pushes on a cam inside the
pump for enrichment.
I wanted to try and use a coil and plunger arrangment to push on this cam,
only when
under boost.  So what I am thinking is a 12V, PWM output based on a
MAP/boost sensor
input, and maybe Air temp.  How simple would such a circuit be?  I am not an
EE, but a ME, with a little EE experience.  Programming is not a problem.
Designing circuits, that's a
different story.

So MAP / IAT  --->  processor or circuit  ---->  single PWM output (could be
high amperage,)
	
(depends on the force 
	
(needed to overcome pump
	
(internal spring press.)

If there was an easy way to do such a system, would it be easily tunable?
Pots on a breadboard, or laptop?  A lookup table seemed the simplest to tune
to me, but perhaps
not to build.

Any help is appreciated.
Thanks!
Mark
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