Re: LT1 boost retard??

[Roger Heflin <rah@horizon.hit.net>]

Something I did notice, it looks like the IAT (intake air temp) causes
retard.   I did not see it causing anything else, but it may, someone
will need to check the code to see everything it changes, but by
adjusting the table you could make IAT retart things differently, you
might even be able to leave the IAT in the compressed air intake
piping and just adjust the tables to cut timing.   The way I figured
out this was I had two different runs recorded in diacom, both with
the same engine temp, only the IAT temp varied, and one had about 6
degrees less base timing.

			Roger

On Mon, 21 Feb 2000, PCMdoc wrote:

> Shannen,
> 	You could use this interface, and rebuild the tables in the PCM so you got the
> right amount of retard. I would have to look at the details, but I think that
> the traction control retard is a digital input, so it's all or nothing on the
> retard.
> 
> 		Ken
> 
> Shannen Durphey wrote:
> > 
> > Looking at pinouts tonight, I see that the 92/93 Y car LT1 ECM
> > recieves a signal from traction control for timing retard during
> > wheelspin.  I wonder if this input could also be used for additional
> > spark retard under boost.
> > 
> > Shannen
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