Dual TBI units - How To Handle Twin IAC's?

[cranford at texas.net]

Walt...

Can ya give more details on the external P&H driver box?  That's exactly what I 
remember reading about a little while back in another thread, but couldn't find 
again!  This idea is really starting to come together with ya'lls help!  Thanks 
for all the input so far and keep it comin' please!

Stephen

> 
> Perfect timing for this discussion thread..........
> 
> Just days ago I ordered a brand new 454SS TBI unit from GM (17112570 aka
> 17091047),  to feed the second of two screw-chargers that will live together
> atop my 454.    I'll be converting both TBI units for 30psig fuel pressure
> operation (17113079 regulator),  in order to feed the peak airflow
> requirements, and I intend to control both TBI's simultaneously via the
> stock 16147060/BAMY PCM  together with an external  2-to-4  4/1 amp P&H
> current driver box.
> 
> At this point everything regarding the project has been planned out in great
> detail,  EXCEPT for the twin IAC issue.  I am still in the midst of "head
> scratching" as to what I will do about this.  I could cheat, and just drive
> one IAC via the PCM, but,  I would prefer to drive both IAC's via the PCM
> for mixture and pressure balance reasons.  Here's what I am
> wondering............
> 
> 1) Can I physically drive two IAC's from the single PCM IAC driver?
> 2) If so, should I wire the two IAC's in parallel?
> 3) For a first blush at the cal, can I simply cut the commanded IAC steps in
> half?  Just looking for a starting point.
> 4) Any other thoughts or recommendations?
> 
> 
> Thanks a bunch;
> Walt.
> 
>