ALDL Tuning

[Scott Pearson]

If a disposable engine is the problem, I've got a 2.8L Corsica to try it on.
I don't know how to write the software to do it, but I'll volunteer the 'at
risk' vehicle...

Scott

----- Original Message -----
From: "Jeremy Gonyou" <jeremygonyou at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, September 04, 2001 11:22 AM
Subject: Re: ALDL Tuning


>
> Malcomm,
>
> Mode 4 seems to be the black sheep of the aldl command
> family.  No one ever talks about, no s/w supports it,
> and no one seems to know about it.  If it wasn't for
> the "turbo_p4_doc" file, I wouldn't know that it
> existed.
>
> It looks like very powerful took indeed.  Aside from
> the functions you mention, it looks like it can
> disable c/l, the ses light, fan control, IAC control,
> etc.  Perhaps the reason it isn't widely used, is that
> nobody wants to bet their engine on their typing
> skills.  I can see some poor soul screaming over the
> remnants of a shattered piston, "I meant _$C4_, not
> $4C !!!"
>
> Regardless, I think it'd be a great idea to develop
> this a bit further.  People are still working on "Fuel
> Knobs" and such.
> Maybe if the commands were integrated into a
> user-friendy s/w package we'd get some takers...
>
> Jeremy
>
>
> > Something has just occurred to me. Both Ludis and
> > BobR have said that they
> > haven't looked closely at the P4 ALDL code. Well
> > something I have noticed
> > is that (in my EPROM mask at least) it is possible
> > to set the desired
> > Air/Fuel mixture and the desired Spark
> > Advance/Retard by using ALDL Mode 4.
> > In other words, you can override the values
> > calculated by the ECU and force
> > it to use what you want. I've always been too scared
> > to try this on my own
> > car, because it would cost a lot to fix if I broke
> > something.
> >
> > Both the air/fuel mix and the spark can be set to an
> > absolute value (i.e.
> > command 14.7 A/F or 10Deg spark) , or  to delta
> > values (i.e. ECU calculated
> > +/- something)
> >
> > I hope I'm not teaching grandma to suck eggs, but
> > wouldn't this ease the
> > tuning of engines at given revs ? I haven't seen any
> > comment about software
> > packages invoking these Mode 4 commands, so I just
> > thought I'd run the idea
> > up the flag pole and see if anyone saluted it.
> >
> > Cheers,
> > Malcolm Robb, LC 0112G
> >
> >
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