From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [FlyRotary] interesting discussion on intake temp and fuel
 delivery.
To: flyrotary
Date: Tue, 29 Oct 2002 22:56:01 -0500
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Posted for "Ed Anderson" <eanderson@carolina.rr.com>:
I think Tracy Crook would be the one to answer that question.  His EC2 does
provided an intake air temperature input to Processor "A" of his EC2 system,
but not processor "B".  I am uncertain how that would work with a system
running boost.  Colder/denser air requires more fuel to maintain the same
air/fuel ratio, but of course with boost your are increasing the temperature
of the air but at the same time compressing it to increase the density of
it.  So the two processes are somewhat in conflict with each other as to
effect on air density on a boosted engine.  One would assume (you can do the
calculations) that the increased density caused by the boost is sufficient
to more than counteract (and then some) the decrease in density caused by
the rise in boosted air temperature.

So the EC2 (provided you have the turbocharger version) will provide
increase fuel flow to meet the higher air density in the manifold due to
boost.  At the same time IF the EC2 air temp sensor is after the compressor,
it would read the higher temperature and probably react by trying to
decrease the fuel flow.  If you had the air temp sensor before the
compressor then their would be no sensing of the increased air temp due to
boost and the manifold pressure would be the dominate factor driving fuel
flow into the engine (along with rpm).  That would be my take on it.

Ed Anderson

> Does anyone know if TC's EC2 makes adjustments for intake temp in the
> fuel maps for boosted engines? I seem to remember it does.