ALDL Tuning (Mode $04 commands)

[Malcolm Robb, LC 0112G]

I think you've probably hit the nail on the head. If people get the Mode 1 
stuff wrong, then all that happens is they get duff data printed to the 
screen. Get the Mode 4 stuff wrong, and you risk a big bang. It looks to me 
that spark adjustment is possible +/- 90 degrees from TDC! Quite dangerous 
at 6000 RPM putting out 400 BHP I suspect. Given that there isn't much 
published info on Mode 4, it's going to require people to dis-assemble each 
and every program mask, just to make sure that some twerp at GM hasn't 
changed the order of some of the parameters.

I use your software all the time. As soon as I'm happy I know what all the 
Mode 4 parameters are for my car, I'll try it, and let you know the 
results. However, I'm scared to publicaly post the results, incase someone 
else thinks the same will work on their car, tries it, and then accuses me 
of blowing up their engine. Similarly, any keyboard based program risks the 
$4C/$C4 typing error problem that Jeremy pointed out.

The level of computer literacy varies widely across all list members, and I 
suspect what's needed is a Windows type interface with 2 graphical 'knobs' 
on it, one for A/F and one for Spark. Maybe a few switches to disable 
closed loop, operate fans etc. Also perhaps an 'Expert' mode, which allows 
much greater ranges to be used for more advanced users. Add a dial gauge 
for the DIY-WB sensor input, and ....  Well you get the picture.

I'd appreciate some input from the more experianced tuners here. Am I 
wasting my time trying to do this, or would such a software tool be useful 
? It would be freeware/shareware to all of course !

Cheers,
Malcolm Robb, LC 0112G

-----Original Message-----
From:	Paul Blackmore [SMTP:paul at blacky.co.nz]
Sent:	Tuesday, September 04, 2001 11:45 PM
To:	Gmecm
Cc:	Jeremy Gonyou; Webmaster Lotus-Carlton
Subject:	Re: ALDL Tuning (Mode $04 commands)

However and here's the kicker - the commands seem to be in a different 
format for different ECM's. Similar to how the ALDL data stream is 
different for most ECM. I don't have any info for what format the commands 
should be in for US based vehicles

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