ECM Selection

[andy quaas]

So what kinda changes are needed to make the 749 code work in the 730? 
IS this a major problem?

Andy

--- Bruce Plecan <nacelp at bright.net> wrote:
> Before thinking about which one you need, might stop,
> to think though what
> your doing.
> 
> In general.
> There is lots of info. on the following:
> 1227148
> 1227165
> 1227730
> 1227747
> 1227749
> 1227808
> 
> The 148,  6cyl  SEFI  MAF  DIS  Turbo  (jury out
> about NA tables lining up)
> 165/808   4-6-8 cyl  MAF/MAP  Dist/DIS
> 730  4-6-8 cyl MAP/MAF Dist DIS
> 747  6-8 cyl MAP Dist
> 749  4-6 cyl MAP Dist  Turbo
> 
>  On the 148, I haven't seen or heard of anyone using
> that other than on a Bk
> v-6
>    pretty much as is.  C-3
> The 165 as the ARAP v-8 has info. floating about, in
> the 808 version there
> are
>   supposedly 2-3 bar MAP versions in Oz.  P4/C-3 
> (808 C-3 ALDL)
> The 730 as AHNT v-8 MAP has info floating around. 
> P-4
> The 749 as v-6 turbo has a fully documented editor
> available for $15.  P-4
> The 747 is a C-3 that has some info floating around.
> 
> There are some tools for using the 148, and getting
> some data from the ecm
> or
> from inside the ecm.
> C-3 using diacom, are lacking in info, available from
> the ALDL
> P-4 using diacom, give you a pretty good handle on
> what the ecm is thinking.
> 
> MAF or MAP just infer how much air the engine is
> using, both get converted
> to grams/second, so the "direct reading advantage" is
> mute, IMHO
> MAFs are more expensive than MAPs.
> MAFs suffer from reversion, and delays in foil/wire
> changing temps, slight
> but there.
> MAPs have to have the filtering closer to right.
> GM makes it decision based on millions of cars and
> federal mandates, so
> using their example for selection is fine, if your
> going to build a couple
> million cars.
> 
> The 730 (256K prom) has 2x the room for PID.
> The 747 allows for an open loop idle.
> No one has cross trained an ecm from DIS to Dist
> without external hardware
> The 749 can do Peak+Hold for four injectors, in oem
> form.
> You can run 749 code (with appropriate changes) in a
> 730, but lose wastegate
> control..
> What ever you do you will be right..  If you think it
> won't work it won't.
> If you make an uninformed decision, your results will
> suffer.
> Beleive dam little of what anyone tells ya, getting
> the knack for doing ecms
> right takes alot of work.  Key word is right.
> 
> All you have to have is a DVM, a timer, a notebook, a
> ecm+car, and
> promburning/erasing equipment.  An emulator/editor is
> nice but not a have to
> have.
> Simplicity is the key to design.
> Being resourceful can save $$$$..
> To make a better informed decision you ought to read
> the entire archives 2
> or more times, IMHO
> Bruce
> 
> 
> 

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