ECU Tuning as per Down Under

[Chris Pronios]

> From: "Wayne Cox"
> Well, I've got 2 JWT boxes with different numbers on them for non-CA 5
> speed B13s, and a stock B13 box.  Would be nice to compare.

Wayne, it may not be that easy to compare. I learned from another list
member that some JWT ECUs used a single 1Mbit chipp instead of the more
common 2x256 or 2x512 configurations. In this case reading the maps would be
a bit more technically challenging than a simple read ROM and compare but it
can be done.
Plus, even with two chips on the daughterboard there are 2 different ways of
organising the data on the chips. However, a simple trial and error
procedure and an educated inspection of the daughterboard design can offer
the necessary knowledge.

> Guess I don't
> have any way to suck out the stock ROM though.

As far as I know it can be done but it is very challenging. It probably
entails de-soldering the ROM chip (64 pins right behind the led &
potensiometer) and reading it with a compatible ROM reader/adaptor. However,
I do not know of anyone who has actually done it.

> Does this guy have anything on how to plug into the consult connector on
> the older (B13) cars?  Or any info on the machine code fro the things?

This guy (as Probedude said) has been a relative newbee on the subject and
very noisy for this matter. Plus he does seem rather ungracious to the rest
of the nissans13 list that helped him create the board. Right after he had a
working design he removed all info and diagrams he had posted until then!
Maybe I am presumtuous here and have to wait to see if he comes true in his
"promise" to put up an info-page with all data when he "has some time".  In
any case his efforts should be applaused.

He laso claimed that the next "project" would be something like the
"Map-Tracer" sold in Japan. It is basically a sit-between interceptor board
that dispalys and logs in real time what part of the maps is used/accessed
at any time!!! Now this would be really cool. HE actually said that he will
try to construct a HW/SW combo that will work as a "real-time EPROM
emulator" running on a PC. This way the PC wuld be running the code, not the
EPROM and the user could do real-time changes on the maps without the need
for reprogramming and then testing. This would be immensely helpful but I
seriously doubt that he is actually aware of the issues and limitations of
serial/parallel buses on a PC.

As for the Consult port I will post all info on a later message. Look for
it.

> Maybe we can set up some little Napster-like system to share ECU code
>:)  Wonder if I've still got that 1800 byte hand assembled 6502 code
> program for "break out" I wrote for the Apple II in high school :)

Why Napster like???? A simple web-based or FTP based file repository would
work well.

Chris