Attention GM TBI experts

[Greg Woods]

Hey guys, I got another question about GM TBI.  

The '86 version of my GM TBI is a speed density type system.  However,
their is no MAT sensor on the computer.  Isn't this a vital part of the
equation?
The 2.8L S10's that used this system had a device called a Thermostatic Air 
Cleaner (TAC).  This air cleaner system used a heat pipe from the exhaust 
manifold and some vacuum motor doors to maintain an air temperature of around 
140 deg F into the throttle body/carberator.

I currently do not have my air cleaner system setup for my recent TBI converion.
I was thinking of going with some type of K&N system, but if the computer is relying
on the fact that the throttle body is being fed with a TAC in making it's air/fuel calculations, then my options are going to be limited.

So I gues my question is, does anyone know how important the TAC is in the 86
GM TBI equation?  (If I remember right later models used an MAT sensor, can
anyone confirm this?)

thanks again

greg woods
gwoods at symtx.com
austin, tx