Re: 747 Rom Emulator / design

[rr <RRauscher@nni.com>]

Yes, on the dyno under heavy load would be a bad time for
limp mode. By doing the updates within the ecm cycle alleviates
this. Hence, why I mentioned the technique.

I've heard of this Kalmaker before, it would be interesting
to see what/how it is made.

BobR.


Daniel N wrote:

> Please Excuse me if i sound stupid here and/or correct me if i'm wrong.
>
> But what if your Tuning a car on a Engine dyno, and you change one of the
> settings, and the engine goes into limp mode whilst on load on the dyno? I
> dunno about you folks :) .. but i've seen quite a few aftermarket EFI
> setup's on the dyno dynamics Dyno's we got here in australia.. and i dont
> really see it being a good thing?
> like i said, correct me if i'm wrong..
>
> Also, a little on the Emulator board, isnt there a simpler way of doing it ?
> I mean, i'm not saying its bad or anything, but compared to the Kalmaker
> emulator we have here for the Holden Delcos.. it looked much smaller /
> simpler.. but then again have i missed something? Has anybody here seen the
> kalmaker setup ?
>
> Daniel
>
> >From: rr <RRauscher@nni.com>
> >Reply-To: gmecm@diy-efi.org
> >To: gmecm@diy-efi.org
> >Subject: Re: 747 Rom Emulator / design
> >Date: Thu, 27 Jul 2000 17:22:46 -0400
> >
> >
> >Dual port ram is really not required. It's expensive and can be
> >tough to get. Remember that the ecm's bus cycle time is almost
> >a usec. Some 100 to 150 nsec SRAM can easily be updated
> >within a part of the cycle.
> >
> >Another way to look at it is: Does it matter if the ecm goes into
> >limp when your updating the ram, you can't be driving at
> >the same time your punching keys on a laptop.
> >
> >BobR.
> >
> ><snip>
> >
> >

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