dual 450 cfm TBI for 383 ci SBC

[don.broadus at exeloncorp.com]

  I suggested  to use a 100 ohm or so resistor. If you use a 1.2 ohm this
will simulate 1 injector. The driver FETS for the other injectors will
follow the on/off times off the 747.  This will fire additional injectors
without digging into the 747 circuit. If your worried about not having peak
/hold on the added injectors then you need to redesign the 747 driver, and
then you wont need this adapter 
in this form.

> -----Original Message-----
> From:	rr [SMTP:RRauscher at nni.com]
> Sent:	Monday, January 29, 2001 3:20 PM
> To:	gmecm at diy-efi.org
> Subject:	Re: dual 450 cfm TBI for 383 ci SBC
> 
> 
> It's not that easy. Remember that these are peak-n-hold injectors. . .
> 
> BobR.
> 
> 
> don.broadus at exeloncorp.com wrote:
> 
> > They would have to be P channel MOS fets since the 747 drivers go to
> ground.
> > put a 100 ohm or so load resistor on the the 747 output and the other
> end to
> > +12 VDC. the P Channel MOSFET turns on when the 747 driver goes to
> ground.
> > since P Channel FETS are hard to come by in high currents , It might be
> > easier to use a inverter with a pull up and a N- Channel FET.
> >
> > Don
> >
> > > -----Original Message-----
> > > From: Bruce Plecan [SMTP:nacelp at bright.net]
> > > Sent: Monday, January 29, 2001 10:53 AM
> > > To:   gmecm at diy-efi.org
> > > Subject:      Re: dual 450 cfm TBI for 383 ci SBC
> > >
> > >
> > > Stay tuned,
> > > I got a new box here to try with some Honkin Power Mosfets in it.
> Done
> > > externally would be a min parts deal, just a good heatsink needed.
> This
> > > is
> > > not intended as a daily driver deal, just a kludge to get the job
> done,
> > > and
> > > for off road purposes......
> > > It should last with 6 TBI style injectors.
> > > Just need some TBI injectors to risk.
> > > My first, *bad deal* has left me with a TBI injector shortage.
> > > If some one has 6 or so junk TBI injectors that they don't need (but
> > > function electrically), that would help.  They and the box will run
> till
> > > failure so they will be probably totally trashed....
> > > Bruce
> > >
> > > > -> Other than building a driver box to control the 4 injectors, what
> > > > -> kinks can people forsee?
> > >
> > > >  Can't you just use the output from the 747 to trigger a couple of
> > > > Honkin' Big Transistors(tm)?  Or do you need to add extra stuff?
> > >
> > >
> --------------------------------------------------------------------------
> 
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