Isn't the object of the IAT to measure air temp, to then match/mix the other components of combustion for THAT IAT measured air temperature as it goes through the TB?
The reason I inquire is that even the rice pipe has a couple of feet of metal, subject to radiant heat persistance of the engine. Which will increase the air temperature flowing through it..
I am assuming that lowest temperature of air would be brought, from as far ahead of the engine bay as possible. Then completely isolated from any thermal impact, until into the TB, with something like ceramic insulators.. then the air temp measurement would be valid
1995 SE ..Green and Rattle Can...234K mi...Bonnie (she'll outlive me)
1998 SSEI .. White ..119K mi...Evey
1996 SSE ..MajTeal..157K mi...4/12- Dealer trade full of Lucas Trans fix