Attention GM TBI experts

[peter paul fenske]

Hi Greg

Even later S10s with MAT used the TAC although a wax pellet type
to open the heat door.

Mat is a very very small part of the fuel equation..
Closed loop operation should more than correct for it...

Hope that helps:peter

At 08:24 AM 6/20/97 -0500, you wrote:
>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
>
>