Injector Impedence Q

[John Hess]

The signal you want to send the injectors is a voltage level.  The 
power handling capabilities of the driver will determine how many of 
the injectors you can drive in parallel (As the power handling 
capacity goes down, the voltage delivered will go down for a 
commensurate current drain).  Many injection systems now on the market 
drive 4 injectors in parallel (note that series connection will drop 
the voltage across the injectors).  The impedance of this connection 
is not all that important.  Consider it a "fan out" problem rather 
than an impedance matching problem.


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From:  DemonTSi at aol.com[SMTP:DemonTSi at aol.com]
Sent:  Thursday, February 13, 1997 3:10 PM
To:  diy_efi at coulomb.eng.ohio-state.edu
Subject:  Re: Injector Impedence Q

In a message dated 97-02-13 12:18:32 EST, you write:

<<   Well- not really. If you connect 2 parallel legs, each leg with 2 
series

   injectors you'll have a total impedance similar to a single 
injector. But
the
   voltage across each injector will only be half of the total supply
voltage, ie
   you'll be running them at only 6 volts each, which is to say that 
the
current
   available to each one will be only about half what they were 
designed to
   operate with; not good... >>

Oh yeah..I forgot to mention that I was talking to Tim Drury about 
that
problem also. I wondered about the possiblity of stepping up the 
voltage
somehow...perhaps with a sort of amplifier...?
I was thinking about the whole set up like an audio system...where you 
take
the signal from the ECU that tells the original inj when and how long 
to
fire..and then basically "amplify" that signal by four so that each of 
the
four new inj will get the exact same signal os the original one.

Van