[Gmecm] Re: '7747: Back to tuning after 4-year hiatus

[davesnothereman at netscape.net]

Something I obtained a few years ago.  From 258 Jeep with Howell 7747 fuel only conversion.  Cal is 454 base for 4.3 TB and injectors with non-stock cam, intake, and exhaust.  This auto trans jeep would powerbrake and spin 32's with no trouble after cal was developed on the dyno.  Currently on incoming as jeep024.bin until made accessible by Steve.  Maybe it works for ya, maybe not.

Zaphod

Andrew Gibson <andrewsharyn at yahoo.com> wrote:

>I would reccomend using a bin from a Late 80's 4.3L TBI. The egr is vacuum controlled, the engine displacement and volumetric efficiency will be very close to yours, as well as the timing tables. I asked clifford performance about using that setup on my chev 4.1L (250cid) and they said the conversion runs great without modifying anything in the prom code or fuel tables.
>   
>  Good luck!
>   
>  By the way I'm running a 7748 1bbl tbi on my bone stock chev 250 6cyl. Took some creative thought in the fuel tables but it runs really well. Still too runs rich at WOT but who can afford to run the gas pedal that hard these days? When I get everything figured out I'll upload a bin file and a txt file with all the details and instructions for the conversion.
>
>        
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