749 inna 730

[Walter Sherwin]

>The answer is in the archives,
>and if you haven't bought a 730 why not just use a 749?.
>Bruce
>
>
>>I dunno!  Why not?
>>I'm just scared to try something that nobody has talked about (use a 749
>>on a v-8 w/o a turbo).
>>Supposedly there is a cylinder select function, as is shown in the
>>promgrammer.  But it won't let me change it to and 8!
>>Andy
>>--- Ludis Langens <ludis at cruzers.com> wrote:
>>> andy quaas wrote:
>>> > p.s. i'm leaning on the MAP 7730 (possibly with a
>>> 749 EPROM).
>>> Why not a '749 PROM running in a ... '749?
>>> Ludis Langens                               ludis
>>> (at) cruzers (dot) com
>>> Mac, Fiero, & engine controller goodies:
>>> http://www.cruzers.com/~ludis/




Never played with a 749, so please excuse me if this is common knowledge to
the list.   I can comprehend changing the cylinder select, setting the
1bar/2bar MAP flag, finding and changing the injector constants, and
reworking the spark/fuel tables to match a V8 application.  This is all fine
and dandy as long as the CPU is in control of things.  What
if..............one day the system drops into "limp home mode" (redundant
fuel & spark).   Limp home will be terribly screwed up on a V8 will it not?
Is this feature moded through the MEMCAL, like other boxes?   Can a person
somehow either   1) calibrate the backup fuel/spark/reference pulse
functions to suit, or     2) defeat the entire feature so that it NEVER
kicks in (ie: no backup to the CPU)?   Option #2 sounds most attractive.
Has anyone fiddled with this?


Walt.