High-impedance injector off a low-impedance driver?

[Geddes, Brian J]

Okay, after a little research and lots of good advice from Bruce of the
Megasquirt site, I've figured out that I can't run the two injector types in
parallel.  

An EE friend of mine had the following idea:  what if I got an opamp, set it
to a gain of 1 (I think that makes it a voltage follower?), and wired the
inputs of the opamp in parallel with my low-impedance injector?  I could
then use the opamp's output to drive the high impedance injector.  It seems
like that should effectively recreate the ECU's injector driver signal for
my additional high-impedance injector, but have it draw it's current
directly from the battery/alternator.  

I'm no EE though.  Any problems with a system like this?  And where would I
buy an opamp?  

Thanks,
- Brian 

> -----Original Message-----
> From: Geddes, Brian J [mailto:brian.j.geddes at intel.com]
> Sent: Wednesday, March 06, 2002 10:25 AM
> To: DIY EFI Mailing List (E-mail)
> Subject: High-impedance injector off a low-impedance driver?
> 
> 
> All - 
> 
> Hello!  I'm new to this list - I just stumbled across it 
> yesterday while
> doing some research on fuel injectors.  As a newbie, of 
> course, I have a
> question.  :)
> 
> Is it possible to run a high-impedance (saturated) fuel injector off a
> low-impedance (peak-and-hold) driver?  I have high-impedance 
> injectors in my
> car (a '94 turbo mitsubishi), and would like to run a additional
> high-impedance injector in parallel with one of my stock low-impedance
> injectors.  What I've seen so far in my research makes me think it's
> possible, but I'm not quite sure enough yet to try it.  Has 
> anyone done
> something like this?  Would I need to stick a resistor in before the
> high-impedance injector?  
> 
> Thanks,
> - Brian Geddes
> 
> 
> 
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