ALDL Tuning

[Jeremy Gonyou]

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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