A '747 for ignition only

[rr]

Well, it works, so far so good. I have an entire '747 system, sanes 
TBI under the hood.  Only thing with the TBI is that I plugged a 
TPS into the connector and it's laying on the intake manifold.

Disabled the O2 & TPS error codes, setup the spark map as though
it was a centrif distributor only, put the original carb on,
and fired it up. (Other misc changes in the PROM also).

No error codes, data stream looks good, I'm going for a test drive
as soon as I'm off the PC here...

This is also the first (FIRST!) firing of any efi system that I've
ever done! Yea, I'm a little excited, Yaaa-hoooo.

BobR.

P.S. As soon as I'm done playing with this, I'll get that high
pressure fuel system and the TBI on.


rr wrote:
> 
> Bruce Plecan wrote:
> >
> > -----Original Message-----
> > From: rr <RRauscher at nni.com>
> > To: diy_efi at esl.eng.ohio-state.edu <diy_efi at esl.eng.ohio-state.edu>
> > Date: Wednesday, March 24, 1999 11:55 AM
> > Subject: A '747 for ignition only
> >
> > >Bruce, I remember that you had mentioned this before. Whether a '747
> > >could be used for a computer ignition system only. As my install is
> > >right at the point of needing an EFI fuel system. And the carb system
> 
> As for needing just the EFI fuel system, I was actually meaning,
> the pump/filter/lines to the TBI. I have an entire '747 system from
> a truck currently installed in/on the engine/vehicle.
> 
> Only take a minute to pull the TBI and throw the carb back on.
> 
> > >is still in place, I think I'll try it out.
> > >Off the top of my head, the one thing that needs to be done, it to
> > >zero the error bit map for all the O2 stuff. Burn the prom with
> > >some spark tables, and try it.
> > >Anything else you can think of?
> >
> > On a CCC:
> > You'll need the right MAP,
> > TPS, Seems likely to be shareable.
> 
> TPS, hmmm, that I'll lose removing the TBI. Maybe it won't
> matter much, I should still get some PE due to the MAP.
> 
> >   ESC, and KS probably different.   You'd have to call Chev or Parts House
> > for accurate info., I'm not sure.
> > For the intial fire it up to see of it runs, I'd disable all the malfunction
> > flags.
> > Set the timing, and immediately try a chip with like you said 13-44-45
> > disabled, and closed loop/learn temps set to FF.
> 
> Yep, good idea's here.
> 
> > Depending on what you actually doing, you'll need the fuel pump signals
> > wired in.
> 
> Done.
> 
> >
> > None CCC:
> > gonna need a TPS, in addition to the above..
> > Bruce
> > >
> > >BobR.
> 
> I'm thinking that the main spark table is RPM vs MAP, it's
> the little things that might mess me up.
> 
> I'll let everyone know how this goes... Yea, I'm gonna
> try it. Why not! Gotta' learn somehow.
> 
> BobR.
> 
> Ya' sure Doc's not up for a ride under the hood with a
> timing light? LOL
> 
> --