Because you can get too much of a good thing, particularly on a humid day. It can get cold enough to ice up the intake tract. Then you'll have a very slow race car.NewbVetteGuy wrote: ↑Thu Jul 18, 2019 7:55 pmWhat is the reason that in port & direct fuel injection apps, that we don't see fuel injection into the plenum for reduced IATs?
Icing is why most OEM intake carburetor and TBI manifolds have exhaust heat crossovers, "hot spots", or water jackets. Heck, I put a 2" spacer on a small block Chevy once, and it built up a thick layer of frost on the outside after idling for a while, even with the fan blowing hot radiator air over it.
If your engine management system doesn't have some means to detect and deal with icing, you'll eventually run into the proper weather conditions to promote icing. You'd need a humidity sensor to do it right; otherwise, you could watch IAT and diddle EGR.