off subject

[Don.F.Broadus at ucm.com]

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 >>
>