[FSJ-List] Output of distributer's magnetic pickup

[Raymond C Drouillard]

I'm sending this to the list because someone else might be interested in
this info.

The advantage of the Howell system is that they use a standard GM
computer, so you can get a replacement at your local parts store or
junkyard.  Both seem to use standard sensors and stuff like that. 
According to an article I read, the Howell and Holley systems use the
same throttle body.

The main advantage to the Holley systems is that you can program them
yourself.

If you are planning on installing the fuel injection system on to your
engine and plan on leaving it alone, the Howell system will work fine. 
You tell them what you have, and what modifications you have made, and
they burn a PROM for you.  If you make any changes (new manifold, bumpier
cam, headers, or whatever), you tell them what you did and they burn you
a new PROM - for a price ($100.00, I believe).  What they do is to
calculate the (theoretically) what your fuel map should be, and burn the
PROM based on that.  I understand that it is pretty accurate.

With the Holley system, you have lots of room for tweaking.  Also, if you
buy something off-the-wall, like a Wieland manifold or custom headers,
you can program it to suit.  If you port the heads, you can change the
program on the Holley, but you would have to describe what you did for
the Howell system.  You program it by making changes and looking at how
the performance changes, rather than calculating some theoretical map.

You can program any of the systems with five controls (low jet, idle
trim, main jet, hith-rpm jet, accel pump, and choke).  This will allow
you to set up your engine for economy, performance, or anywhere in
between.  If you go with Holley Pro-Jection 4Di, you control the fuel
tables directly.  This allows you to set the cruise part of the map for
economy, and set the wide-open-throttle portion for performance.  Also,
you can control spark advance - if you hook it up right.  I'll give you
more details on that when I finish that part.

Ray Drouillard



On Sat, 25 Apr 1998 23:33:25 -0400 Gregory_Tellone at sandata.com writes:
>
>Hey Ray,
>
>I'm going to buy the TBI fuel injection on Monday..for my 89 Gw.. I'm
>looking at one made by Howell
>http://www.howell-efi.com/tbikits.html and I'm looking at two by 
>Holley
>http://www.holley.com/HiOctn/ProdLine/FuelInj/Comp/504-23.html         
>or
>http://www.holley.com/HiOctn/ProdLine/FuelInj/Comp/504-22.html
>
>Which one you think is better for street/4wd use.. or if you know of a
>better one..
>Both of these will fit on an Edlebrock performer 4bbl manifold.
>
>Thanks!
>
>
>
>
>To:   Gregory Tellone/Sandata
>cc:
>Subject:  Re: [FSJ-List] Output of distributer's magnetic pickup
>
>
>
>
>
>On Tue, 14 Apr 1998 11:17:03 -0400 Gregory_Tellone at sandata.com writes:
>>
>>Hey Ray,
>>
>>Wanted to know if you put the 4Di in yet.. and how you like it.. I 
>saw a
>>good write up on it in Peterson's 4wd.. How much did you get the 
>setup
>for?
>>You had to get a new manifold also.. right? what did you get for 
>that?
>>
>>Thanks!
>
>I have had the 4Di system installed for quite some time.  I had the
>engine rebuilt last September and ran it with the stock carb (and an
>adapter plate that my brother turned out for me on the NC machine) 
>'till
>January.  When I had it rebuilt, I had them bump up the compression 
>and
>install an RV cam.  I also supplied them with an Edelbrock Performer
>manifold.
>
>I put the 4Di system in January, but couldn't get it to talk to the
>computer.  I found that it cruises just fine without being programmed,
>however.  The O2 sensor corrects the mixture after a few tenths of a
>second.
>
>I think I paid about $1300 for the system from Summit Racing.  Of 
>course,
>there are other exterraneous expenses, such as the installation of the 
>O2
>sensor boss.  Also, the laptop I bought was around $400.00.
>
>I kept up a running commentary on the new FSJ list as I was tuning the
>system (fsj at digest.net).  I sent a summary to the other FSJ list
>(fsj-list at unix.off-road.com), and Doc put it in the tech section of 
>one
>of the FSJ lists.
>
>I cross-posted the question to three different lists.  Which list are 
>you
>subscribed to?  Do you need more info about where to read about the
>installation and tuning of the system?  Eventually, I am going to send
>all of the text and some pictures that I took to John Meister so that 
>he
>can format them into an HTML file and put them on his web site.
>
>By the way, my Jeep is still "work in progress".  So far, I have:
>AMC 360
>Holley Pro-Jection 4Di
>Edelbrock Performer manifold
>RV cam
>3" exhaust system
>Engine Guard pre-luber
>30X9.5 mud/snow tires
>
>Ray Drouillard
>
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>
>
>
>

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