IAT placement

[Squash]

I agree.  I don't really know if the IAT has much
effect on anything except startup.  If what I think is
true (the IAT is no more than a small a/f correction),
then IAT would have little effect if it is anywhere
near a normal operating temp.  I'm sure forced
induction apps might contradict this theory, tho.

Squash

--- Dave Zug <dzug at delanet.com> wrote:
> you'd figger they would have "poor location" based
> corrections built 
> into the conversion curves, or compensations for the
> skewed 
> temperatures built into the calc's. anything is
> possible. when 
> presented with a poor location and management says
> "deal with it, we 
> aint making another casting for you"{MBA's HAH!}
> there are still ways 
> of using engineering principles and code to
> compensate. My experience 
> is in the HVAC controls world.. they call it "value
> engineering".
> 
> > Date:          Fri, 29 Oct 1999 07:25:57 -0700
> (PDT)
> > From:          Squash <realsquash at yahoo.com>
> > Subject:       Re: IAT placement
> > To:            gmecm at efi332.eng.ohio-state.edu
> > Reply-to:      gmecm at efi332.eng.ohio-state.edu
> 
> > Since I haven't had my foot in my mouth since
> > yesterday, here goes...
> > 
> > If the factory setup used a manifold hole for IAT,
> > then i would think you'd want it in there because
> the
> > factory calibration would be closer.  But if you
> plan
> > on tweaking tables and stuff anyways, I'd put it
> right
> > before the throttle body.  Does anyone have any
> > running numbers for IAT on differing applications?
>  My
> > engine compartment gets so hot that the sensor is
> hot
> > to the touch anyways, even though the incoming air
> is
> > not that hot.
> > 
> > Squash
> > 
> > > > > >What's the collective thought on placement
> of
> > > the IAT sensor?
> > > > > >
> > > > > >On the TPI the IAT was originally in the
> > > manifold; on my setup I can put it
> > > > > >either in the airstream ahead of the
> throttle
> > > body, or I can drill & tap a
> > > > > >hole in the intake for it.   Obviously, the
> > > first is the easier method.
> > > > > >
> > > > > >I would think that a sensor in the manifold
> > > would read a few degrees higher
> > > > > >due to heat transfer from the motor into
> the
> > > intake, and the ECM might take
> > > > > >this into account (or vice-versa).
> > > > > >
> > > > > >
> > > > > >--> Bob Valentine
> > > > > >--> bob at tecmark.com
> > 
> > 
> > =====
> > 
> > __________________________________________________
> > Do You Yahoo!?
> > Bid and sell for free at http://auctions.yahoo.com
> > 
> > 
> ~~~
> Dave Z. www.delanet.com/~tgp
> 


=====

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