1.8 TBI and the 7747

[Shannen Durphey]

Bruce Plecan wrote:
> 
> The 747 uses two injector drivers, and they fire alternately on every
> ignition pulse.  The applications for 4 cyl TBI I recall are all single
> head TBI's, so what do you do with the other injector line?.  Just
> leave things dangleing isn't how I see to get it right.  I haven't seen
> an oem application for a 4 cyl 747, and have no idea about what
> table/sswitches/settings would be needed to change to run it that

Old days, same ecm was used in 83 F body 5.0 as in 83 X body with
2.5.  Only one injector connector.  I agree with starting from a
working calibration that's close, rather than trying to modify one
that isn't.  4 cyl 747 conversion probably better for someone who
enjoys tuning as much as driving.

Shannen

> way.
>   The early S-10s used a 1227165 as a 4 cyl TBI, and with it's
> single final drive, and it use being correct for what he was doing
> looked like it would be a more likely doable arrangement..
>   If you look at 808 they used it as a 4 cyl TPI, but with that there is
> enough info., that that might be workable, as a TBI.
>   There are all kinds of options but inho some seem more likely to
> succeed.
>   Personnally I'd probably wind up trying them all, but, I would start with
> the easiest.
> Cheers
> Bruce
> 
> >ok, but for a small 4 cyl, why would I want a 747 vs a 165 ?? I woudln't
> >know which tables to modify etc. just curious, I'm just about ready to go
> >out and find a 165 ecu.
> >Ted Stowe
>  To: diy_efi at efi332.eng.ohio-state.edu
> >> Subject: Re: 1.8 TBI and the 7747
> >> I hate to blow it for the rest of us that know but in a 747 and others
> >> just
> >> get a calpak from a 4 cyl(ex. S-10) and plug it in to a 747.....its just
> a
> >> resistor network that gets the processor to understand the ticks while
> >> cranking that it's a 4 cyl......then make sure you change the cyl select
> >> in
> >> the lookup tables so the "timing" is correct......blah blah and then some
> >> -Carl Summers
> >> In a message dated 1/23/99 8:45:25 PM Pacific Standard Time,
> >> nacelp at bright.net
> >> writes:
> >> << Subj: Re: 1.8 TBI and the 7747
> >>  Sender: owner-diy_efi at efi332.eng.ohio-state.edu
> >>  Reply-to: diy_efi at efi332.eng.ohio-state.edu
> >>  To: diy_efi at efi332.eng.ohio-state.edu
> >>  I knew, you knew that, well maybe a couple other guys,do
> >>  Bruce
> >  >>  Oh, and what 4 cyl application used a 747?.
> >>  >>  Bruce
> >>  >None..
> >>  >Mike V