[Gmecm] '730, '749, '727 EPROM image/memcal compatibility?

[rawardsr]

Or, you holler that your looking for a certain memcal, and more than 
likely one of us have one we'd let you have.  :)

You really need the correct memcal to match the engine type.  Bruce 
Plecan (Grumpy) stressed this when I was gathering efi bits for the malibu.

Bob

Tomas J. Sokorai Sch. wrote:
> On Thursday 15 September 2005 17:47, rawardsr wrote:
> 
>>For the most part, yes.  At least with the 727 and 730.  The 749 is
>>somewhat different with having the second injector driver circuit
>>populated, but has a quad output driver left off.
> 
> 
> Thanks, the bin interchangeability between 727s and 730s is what I'm most 
> interested anyway.
> 
> 
>>That all depends on what size eprom you are using.  Since I use a 32K
>>eprom, and use 16K code, yes I either double the bin file to 32K or
>>place it (16K) into the upper half of the eprom (start at $4000).
> 
> 
> I guessed OK then....
> 
> 
>>>And the resistor network from a very different app? what happens if I
>>>want to use a memcal from a 8cyl to make a 6cyl adaption or even 4cyl? (I
>>>don't care about the detonation sensor filter circuitry).
>>
>>Not recommended.   Bob
> 
> 
> "Not recommended" as in "won't run at all" or "make tuning impossible", or 
> just as in "you'll loose the fail-safe mode"?
> 
> The thing is that I scored a cheap-cheap 727 on ebay, with a 32K memcal from a 
> V6 3.1 T, and I want to use it maybe on a BMW 2.3L 6 cyl. or a 4cyl 2.0L Opel 
> engine. Or maybe to upgrade to PFI my 302 that I recently ugraded from carb 
> to TBI. (In few words, I bought a 727 just to play ;)
> 
> Too bad memcals are impossible to get over here from local junkyards :( and on 
> eBay most are 
> a) hideously expensive
> b) inside the ECM (what kills me is the overseas shipping of the whole 
> package)
> c) hacked and stupidly expensive.
>