What system is easiest to learn and program.

I have no experience with neither of them.

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GTA -89:Free flow muffler,dual 3" HF cats, Edelbrock headers, Vette heads, 1.52 RR 7/16, ZZ-9 cam, Big Mouth, AS&M LTR, !plenum, 52 TB, MSD 6AL, TPIS level V prom, Superior shift-kit and all the minor mods, a Canfield headed 383 in the works!! ready May 2001...
http://www.itv.se/tacs/members_cars/m279/m279.html (Swedish Trans Am Club)

 

Easiest or best?.
Big difference.

Running really large Peak and Hold injectors, then you need DFI, anything less your wasting your money.

Oh, and try gettting a replacement, when on the road. For $40, I carry a spare ecm.

 

There's an old saying: "6 of one. 1/2 dozen of the other". It's all a matter of who you ask. Most on this board will say PROM burning because this is the PROM burning board. You just have to decide how you want to spend your money.

 

Oh really?. guess you haven't been following many threads.

This has been hashed over a million times, and there are times when it matters. As in you CAN'T run 8 Peak and Hold Injectors off of a stock ecm. Please read up on the subject matter before giving advise.

Getting to be like reading Popular Hot Rodding around here at times.

No flaming meant, just the pursuit of the truth.

 

Given the tools available today (Bin Editors, Flash Proms and cheap Eprom Programmers), and the expertise on this board, modifying your eprom couldn't be any easier (other than have someone else do it for you...which this board is not about).

Now tuning the eprom (or DFI) to your setup is a different story. Though there are fair amount of tools that can aid you in tuning many parts of the eprom, it still involves a lot of testing. Grumpy just did a post called "The Real Basics" that is somewhere down on the first page, along with Tim's (Traxion's) P730 post on "Part Throttle Tuning" (and a few other similar posts) that greatly assist you in learing how to tune the eprom to your engine. That is where the real work is. It sounds overwhelming, but it really isn't.

As for "programming", it really is more "modifying of parameters". Very few people I know actually modify the actual machine code (either by direct "bit twiddling" or by disassembling the machine code into Motorolla Assembly Langauage source code.

There is actually very little need to ever do that, unless you wish to make the ecm to use a different set of "tests" or operate differently than GM originally designed it. For most guys, modifying the parameters to make things operate at a different temperature, speed, load, etc is more than enough to handle most tuning needs.

 

Grumpy,

PLEASE explain to me how the Edelbrock TBI-to-MPFI conversion with the 7747 ECU drives 8 individual injectors?!?! Are they special low-impedance injectors or something??? What gives???

 

The are / were marelli injectors, and actually a rather special case in so far as a high impedance injector go, cause they operate rather well at short pulse widths.

Electrically 8, 16 ohm resistors work out to be about the same as 2, 1.2 ohm resistors.

You in theory and given some time get a TPI close using a 747 ala same as they did.

If you look at the edlebrock prom image they did so some accleration enrichment stuff that makes sense, ie less, and I think they were a couple other interesting tweaks, but been along time since I was studying them.

FWIW, If you're going port just use the 730. It's a great ecm, and lots of folks have had extremely good results.

If TBI then the 747.

 

I actually am using the 7747 now with my existing TBI setup so I'd like to use it for any MPFI, if possible. I have an Eelbrock ProFlo on the floor with the bigger Mag/marelli injectors (they look "bigger"/taller than the MPFI conversion injectors Eelbrock uses, that is...). Could I buy the Edelbrock harness and use my 7747 ECU to run the injectors on that manifold (big single plane) and use a 670cfm TBI with no pod/injectors as the air control/IAC/TPS device???


[This message has been edited by FastBroker (edited May 25, 2001).]

 

Grumpy: Why so grumpy? You'll take notice that my post was two minutes after yours, so I was typing when you were posting. My comment had nothing to do with your post. I'll just leave now, it seems the experts are handling it. :shrug:

 

Your message was the same.
Inaccurate.
That's what makes me Grumpy.
If you had read more about the subject matter then you would know there are specific times when one has an advantage over the other. As a moderator, I woud expect you to at least try and set some min standard for accurate and timey info.. Well since since you've decided to leave, Bye....