Another strange injector question

[Scott Lundahl <scott@lumenetics.com>]

I'm still looking at using the stock Rover (Lucas/Bosch) manifold, fuel 
rail, TPS, temp sensor, and, possibly, injectors with a '747 ECU.  I think 
it can be done and for the TR world would be a very nice setup.

When I asked before there was a lot of discussion regarding saturation vs 
P&H injectors.  I'm trying to determine which type the Rover unit 
uses.  Electrically they have a resistance of 2.8 ohms and are wired with a 
6 ohm current limiting "ballast" resistor in series with each one.  Each 
injector has its own drive transistor (notorious for failure in these 
systems).   To me this looks it might be set up to use P&H injectors in a 
saturation mode.  The Lucas/Bosch ECU is a very primitive analog unit that 
uses a vane type air flow meter.  Lucas specs the normal pulse width range 
to be 1.5 ms to 10 ms.  The stock system operates as a dual bank with each 
bank firing once per crank revolution (this amounts to a fuel pulse every 
other ignition event).  Cold fuel enrichment is via a 9th injector operated 
like a central port setup.  My attempt will be to have the injectors fire 
every ignition event a la '747 if they are indeed the fast P&H type.  With 
a little tweaking of BPW and async timing this should work and will 
effectively almost double the fuel delivery capacity of the injectors.

Any comments?

Also, is it true that on the '747 V8 TBI the injectors fire alternately on 
every ignition event except in async mode?

Thanks,

Scott

PS - thanks to all who have responded to my other strange injector questions.



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