injector duty cycles

[kleenair at ix.netcom.com]

tom cloud wrote:
> 
> >I noticed that my fuel injected 75 280Z has a fuel pressure regulator that
> >is controlled by manifold pressure.  I assume that this compensates for
> >presssure differential across the injectors.  Has anyone made a system that
> >uses an ECU controlled fuel pressure regulator to compensate for the wide
> >range from idle to WOT?  me
> 
> The Ford EFI also varies the injector pressure -- don't remember how.
> 
> Tom Cloud <cloud at peaches.ph.utexas.edu>

Every port injection system I remember from the big three have a vacuum 
operated fuel pressure regulator.  The exception may be some of the new 
Chrysler products with no fuel return line.

Best Regards, Mazda