GM ECU 1227730/47: basic questions

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John Zarli wrote:
> 
> sfg wrote:
> >
> > John Zarli wrote:
> > >
> > > sfg wrote:
> > > >
> > > > I am using the 1227730 ECU and have a few basic questions:
> > > > 1. since it is so common, where might I find the disassembled code?
> > > >    (I'm using the EPROM 16139544 '87 K5 Blazer: manual trans, TBI)
> > > > 2. Is the memcal a fuse-link type ROM?
> > > > 3. Which application parameters are contained in the memcal?
> > > > 4. I have noticed ref to a "P" suffix on the p/n. Meaning?
> > > > 5. Is its driver circuitry capable of operating with the combined
> > > >    load of 8 injectors wired in parallel?
> > > > 6. Will it run a ZZ4 GM engine (24502609) (with the 10185071 camshaft)?
> > > > I know this is a lot of info, but since this ECU is so popular, answers
> > > > may benefit many people on this list. TIA   Steve
> > > Steve, stay tuned....I should know #6, whether a TBI system can support
> > > a ZZ3 (10185071) camshaft within a few weeks. roller rockers are going
> > > in now. Almost done.  Note that the alum heads on a complete zz3/zz4
> > > engine are the old style bolt pattern....I've heard different opinions
> > > regarding enlarging the bolt holes on newer manifolds to fit those
> > > heads.
> > John, what are you using for injection? TBI or port? Enquiring minds
> > need to know. Also, my GM service parts list (shows all the components
> > in a matrix for the ZZZ, ZZ1,2,3,&4) lists an intake manifold
> > (10185063) as "dual bolt pattern" with EGR and applies to ZZ3 and
> > ZZ4 only. I'll stay tuned....    steve
> Steve, visit the GMGOODWRENCH website & you can download the GM
> Performance parts catalog (free). It has a wealth of info. The ZZ4 is a
> great deal, but as it applies to newer engines...the dual bolt pattern
> is referring to the carb mounting. The intake manifold has an egr
> passage but the heads do not (go figure?) Also the head to intake bolts
> are old style, middle bolts on new manifolds are at a different angle.
> You end up buying the carb manifold, the tooo long water pump & the
> vacuum type distributor.  My approach was to convert an 88 350TBI truck
> motor to hydraulic rollers...very easy...no machining. disadvantage is
> that (my) truck heads, although they have the same 1.94/1.5 valves, have
> a swirl port design, not the performance design of Corvette style heads.
> My logic is that the ZZ4 engine can be used as part of a GM approved
> pollution legal package for older Camaros using an ECM controlled
> quadrajet carb. I figure the TBI system should be at least as smart as
> the carb system it replaced....at least I sure hope so (vbg).
Hi John,
What is URL for GM website? The earlier ZZZ appears to have a different
aluminum
head (same cc) as the ZZ1-4. I have had a ZZZ offered to me, thus need
to compare
details. Wonder if these ZZZ heads (10185087) have EGR and which bolt
pattern?
I thought an '88 engine would be hyd-roller from the factory? No?? Will
you
use a throttle body on your engine? I favor that route- performance is
sufficient
for my truck and I like the simpler plumbing. Holly will sell their TB
by itself
w/o the electronics which opens up inlet manifold options. But how to
cal the
GM ECU to the Holley? Howell (FI company selling adapted GM ECUs) sells
everything
to do it, but I'm DIY *and* a cheapskate. Will call Howel today...maybe
they'll
sell chips only...my hunch is no.  Steve  PS I had the Qjet you mention
on my '85
CA-spec K5 Blazer. E4MD I think. It had bowl-level control, mixture
control solenoid
and a TPS. Worst of all worlds IMHO.