Driver Boards

[Matt S Bower]

I would have thought that this would be a concern even with sefi because
of wot having injector on times over lapping heavily with the other
cylinders.  It would be interesting to read the outcome of that
discussion.  Intersesting info Gar...

Thanks


Garfield Willis wrote:

> Yous guys contemplating using DR's driver boards on your OEM TPI or
> TBI setups, ought to make sure to check with DR as to whether these
> are going to work for you if you drive all (or even half) of those INJ
> drivers all at once on his board, ala batch or bank mode.
> 
> This issue was raised on EFI332, but I doubt if it made it to the
> GMECM list; DR's particular design makes use of a shortcut in sharing
> multiple Cherry drivers on ONE "load resistor" (if you're familiar
> with the Cherry Driver circuit, that's the 300ohm 2W big R, normally
> assigned one per driver); hence, there was some concern about too much
> VR drop across these resistors if many/multiple drivers were to be
> turned on at once. Since the common usage on EFI332 is SEFI I guess it
> was assumed this would be OK, but since it's usually batch or bank on
> GMECM, this might be something to get cleared up before you launch.
> 
> I haven't looked at the design since it was first reported, so I dunno
> if any of this has changed; just thot I should interject a caveat
> since the application is a tad different. If this old/stale/dated
> news, I beg pardon.
> 
> Gar
> 
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