off subject

[Mike Swayze]

do you perchance have numbers on the
driver I.C.'s--I always thought they
used transistors like an audio circuit
or motor driver.
thanks 
Mike S


Don.F.Broadus at ucm.com wrote:
> 
> Yes  the older 2 BBL projection is analog. Holley uses two RC4200 analog
> multipliers to achieve a speed density system. The inputs to the projection
> are Tach/ Coolant temp/ Throttle position sensor.   The driver I.C.'s in the
> projection are a 5 lead type made by Motorola and I haven't been able to
> find out how much power they can drive.  The power I.C. current capability
> makes a difference
> even in an analog system.
> 
> > -----Original Message-----
> > From: mswayze at truswood.com [SMTP:mswayze at truswood.com]
> > Sent: Thursday, December 16, 1999 2:16 PM
> > To:   gmecm at efi332.eng.ohio-state.edu
> > Subject:      Re: off subject
> >
> > Isn't the Projection unit analog? would
> > this make any difference in the
> > injectors?
> > Mike S
> >
> > Don.F.Broadus at ucm.com wrote:
> > >
> > > Is this the 2 BBL. TBI pro jection ?  GM TBI injectors are around 1.2
> > ohms
> > > Holley should be close to this.  If the port injectors you are going to
> > use
> > > are around  12- 16 ohms  drive 4 injectors from one output and 4
> > injectors
> > > from the  other output. GM does the a similar  thing with a  165 ECM on
> > the
> > > 86 Camaro TPI. The injectors are  batch fired ( all 8 injectors
> > connected in
> > > parallel) The same ECM 165 is used on S-10 4 cyl trucks with a 1 BBL TBI
> > .
> > > The 165 ECM has only 1 injector driver and can sink current into as low
> > as
> > > 1.2 ohms. So the ECM sees a 1.2 ohm load with 8  16 ohm injectors  in
> > > parallel or a single 1.2 ohm injector.
> > >
> > > Don
> > >
> > > > -----Original Message-----
> > > > From: mswayze at truswood.com [SMTP:mswayze at truswood.com]
> > > > Sent: Thursday, December 16, 1999 12:39 PM
> > > > To:   GMECM_DIY_EFI
> > > > Subject:      off subject
> > > >
> > > > there is a Holley Pro jection computer
> > > > on E-bay. I wonder if it would fire
> > > > eight injectors?
> > > > byE
> > > > Mike S << File: Card for Mikeswayze >> << File: Card for Mikeswayze >>
> >
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