[Diy_efi] Confused! Lost!

[bcroe at juno.com]

26 Feb 2003 Adam Wade <espresso_doppio at yahoo.com> writes:
> --- bcroe at juno.com wrote:
> 
> > It looks like peak and hold to me; 13 ohms doesn't
> > rule that out.
> 
> Hm.  I am clearly misinformed, then.  I thought that
> the difference in impedance was what dictated the type
> of injector (voltage-limiting or current-limiting). 
> So you can build p&h drivers that work with
> high-impedance injectors?  What would be the advantage
> over building one with a low-impedance injector? 
> Frankly, wouldn't you need to build a rater unusual
> injector driver to get it to operate that way?

I'm guessing the motorcycle just uses a smaller, higher 
impedance peak and hold.  The driver has to be built 
around what injector will do.  

> > Or maybe they are just operating a saturated inj
> > with peak and hold circuitry; kind of loses the
> > simplified driver advantage.  
> 
> The impression I got (which could be all wrong) was
> that using p&h drivers on sat injectors left you with
> nothing more than a sat driving signal with a lot of
> component overhead (and thus, cool components).

That's about right.  Maybe they are saving power.  Bruce Roe

> Maybe I should be looking at some driver circuits so I
> better understand the difference.  I peered through
> the archives rather quickly, but don't think I saw anything...

> Adam Wade

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