[Gmecm] Aftermarket ECM (was Acquiring ECM schematic_

[charles at taildragger.info]

You can really get a 7747 ECM (e.g.) at Autozone?  I tried on their web
site but couldn't find anything.  That's good to know if true.

Unfortunately, my ECM is modified to take EEPROMs, but I suppose I could
burn an old UV PROM for emergencies.

> Hi there!
>
> charles at taildragger.info wrote:
>> Seems like there'd be a market for new ECM's that connect to all the
>> factory wiring, but use modern electronics.  Plus maybe do things a
>> little
>> better (bigger BLM map, etc.) and with better instrumentation.
>>
>> I don't think there's anything like this though, is there?  I mean,
>> besides DIY plans.
>
> The biggest obsticles to building a "superECM" as suggested on a large
> scale are many, including potential patent infringement and emmissions
> certification.  I don't see a market for it, since most customers want a
> replacement part (i.e. don't care about better code or tuning tools) or
> they want a full-custom aftermarket ECM.  Those of us wanting a better
> GM ECM to hack/tune/play with are relatively few and our needs are
> served reasonably well with what we already have or are willing to build.
>
> There is a group on Thirdgen rewriting the TBI code, but it runs on a
> stock GM ECM.
>
> There are plenty of people willing to sell you an aftermarket ECM, like
> FAST.  They are all DIY tuning (with various levels of software and
> support) and most will run old and modern engines in many states of
> tune.  These are targeted mainly at the aftermarket performance crowd,
> and as such are usually tilted at those with hotter than stock engines,
> nitrous control, boost control, etc.  They are a good choice for cars
> whose ECMs are not hacked nearly as completely as GM offerings and for
> owners that do not want to go the DIY route on hacking/tuning.
>
> The downsides are cost, availability in the event of failure (AutoZone
> stocks most common ECMs but not a FAST / Holley / etc. one, so don't
> break down somewhere with an ECM failure), and some limitations with
> handing some of the things that GM ECMs handle out of the box.  They are
> not pin-for-pin compatible but that's an easy problem to solve.
>
> The biggest problem for many may be that they are not
> emmissions-certified, and I doubt an OBD-II car with such an aftermarket
> ECM would pass (even if it were running clean at the tailpipe) due to
> the OBD-II conversations the test centers have with the vehicle.
>
> Jay Vessels
> 1982 Chevrolet S-10 Sport, 2.8V6 TBI
> 1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI pending)
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