holley 4d_ efi changes??

[Fran and Bud]

THERE IS ALWAYS MORE THAN ONE CORRECT ANSWER, BUT THE EARLY PJ SYSTEMS THAT
I HAVE SEEN HAVE A PRETTY BASIC THROTTLE BODY - FUEL REG, INJECTORS,
BUTTERFLY'S, AND A TPS.  THEY ALSO HAVE A BOSS FOR IAC BUT WERE NOT MACHINED
FOR IAC, HAVING A FAST IDLE SOLENOID/ADJ. SCREW AT THE LINKAGE INSTEAD. I
HAVE NOT SEEN THE CURRENT CONFIGURATION TO COMPARE.

HOWELL USES PJ THROTTLE BODIES (OR GM) IN CONJUNCTION WITH GM ELECTRONICS
INCLUDING THE IAC. MAGAZINE ARTICLES HAVE SHOWN PICTURES OF A HOWELL PJ TBI
MACHINED TO ALLOW THE USE OF THE GM IAC.  THE HOWELL INSTALLATIONS USE THE
FULL COMPLEMENT OF GM SENSORS AND ECU.  SHOULD YOU WANT TO USE GM
ELECTRONICS, INCLUDING IAC, WITH A PJ THROTTLE BODY THAT ISNT MACHINED FOR
IAC, THERE ARE SEVERAL SHOPS THAT SELL SPECIAL FITTINGS TO MOUNT AN IAC AND
WHICH CONNECT TO THE MANIFOLD WITH AN ORDINARY THREAD.  UNLESS YOU HAVE THE
EQUIPMENT TO MACHINE THE PROPER PORT YOURSELF, THE ADAPTER WILL COST A LOT
LESS THAN THE MACHINE TIME. 

HOWELL ALSO SELLS A COUPLE OF MANUALS (ONE FOR TBI'S AND ONE FOR TPI'S) THAT
I HAVE PURCHASED, AND FOUND TO BE VERY HELPFULL.  

DOES ANYONE OUT THERE KNOW THE ELECTRONIC DETAILS ABOUT THE PJ SYSTEMS -
2BBL AND 4BBL - ANALOG AND DIGITAL - WHAT IS COMPATABLE AND WHAT ISNT.  IT
MIGHT HELP IN PICKING UP USED PARTS AT SWAP MEETS ETC.AND MAY AVOID A
MELTDOWN FROM MIXING THE WRONG COMBINATIONS?
----------
>From: Ross Corrigan <zxv at istar.ca>
>To: "kv at us.ibm.com" <diy_efi at efi332.eng.ohio-state.edu>
>Subject: holley 4d_ efi changes??
>Date: Sat, Nov 21, 1998, 5:35 PM
>

>has the holley 4d_ system throttle body changed at all since its inception?
> Local fella has the 700cfm unit  FS w/ original analog AND a new digital
>controller that I'd love to mount on my fbody motor'68 327 shortblock w/
>64cc Al heads (a decent breathing setup I'll keep under 350hp)
>
>I know the digital unit is the newer holley controller for the 4d system
>but would the throttle body be as good as current throttle bodies or would
>it be an old/rudimentary introductory type??  (also don't know if this is
>the knob's digital controller or the interactive laplink/computer type) 
>
>He advertised last May when I had no cash and now I do and this is the
>system I've wanted for its lightweight and tuneability, he gets back home
>on Sun (just called from my May ad just to see and he just readvertised
>which I confirmed online) and I don't want to miss the boat on this if it's
>what I want.
>
>new ad just last week..."HOLLEY Pro-Jection 700 CFM 4V compl kit, will fit
>any sq bore manif"
>
>and old May ad
>
>" HOLLEY 700 CFM pro-jection, 465 PPH injectors, comes as a
>                  compl kit incl dig & analogue ECU 6"
>
>thanks to all in advance
>
>PS just read in hotrod dec/98 has one article w/ the 4di answering a few of
>my q's, the digital systems TPS is far more sensitive than the analog's
>TPS.....so even thought the guy w/ this system upgraded to the digital
>controller (yet to know if it's the knobby one or comp. laplink etc) it's
>not the 'same' as the full digital setup erggg, will see
>
>PSS I'm just new to this forum so if this is off base someone please let me
>know...  As well any sites w/ any info on the components Howell sells to
>work w/ this and improve it would be great (I've heard they have several
>ways to use GM components to greatly improve the reliability of the
>system).  I'll have to call them later...
>
>thanks in advance  
>
>Ross Corrigan  /  Vancouver, Canada 
>
> '80 327ZX   IZCC#255, Edmonton Z-car Club #44, British Columbia ZCR        
>Life's a journey, not a destination.. Enjoy the pitstops and maximize the
>straights
>
>mailto:zxv at istar.ca     *New ICQ # 11549358
>http://home.iSTAR.ca/~zxv/index.shtml
>http://207.212.212.139/~corrigan/gearheads/pics/wheels/sirbg.jpg