Moving from 1227747 What is the best TBI ECM to use?
I have been playing with the 1227747 on my Flathead Ford for a month or so now, and am becoming very familiar with it and the tables and scalars and such, but I have been told it is quite crude compared to some of the newer ones. I am leaving the 7747 on the Flathead as I am too far into it to change now, and I like the simplicity of it.
I am contemplating installing a TBI system on my '68 Firebird this year which has the Pontiac 350 in it, 4 speed T10 and 3.42 posi and would like to start searching the local wreckers for a good ECM system to use.
I would like to hear what the best, or next best ECM would be to use today, the next gen as it were. Would there be a huge learning curve for the new ECM or are the tables and such still familiar? I like the 747, and it certainly would do the job, I just thought if I am starting from scratch, maybe I should try something newer.
thanks!
TBI for the traditional Pontiac
As others had said, the 16197427 is a great choice for TBI applications, and can be found in
many 94-5 TBI trucks. I had planned to go this route on the 455 in my 70 Bonneville for a
long time, but ended up jumping right to a Gen 3 PCM instead - more on that later.
If you find a truck with a 16197427, my advice would be to pull everything - TBI, harness,
sensors, PCM, provided the price at your local u-pull-it is reasonable. Around here that
stuff is going for almost nothing.
The other piece of the puzzle that makes this a bolt-in affair on a traditional Pontiac including
the 350 in your 68 Firebird is a 7-wire HEI distributor from an '81 Pontiac, p/n 1103453. They
come off 265 and 301 powered Firebirds, Bonnevilles, Grand Prixs, etc.... With that distributor,
and the TBI to carb adapter of your choice, you can inject your Pontiac 350 with all stock GM
parts.
I've since evolved the EFI setup on my 455 through a bunch of stages. It ran a modified
1103452 distributor for quite a few years, and now has a 24x crank trigger and individual
LS coils, but it took me a few years of iterating and experimenting to get there.