I know that the most accurate thing to do is to use my OEM sensor. BUT- my sensor got damaged and I need to put a resistor in it's place. Now, I have already spoken to a few people about the ohm values and their effect on the computer. We all know that it will run lean with a hot resistor, and rich with a cold one. Snflupigus posted a nice table that gives the resistance of the sensor at certain temperatures. According to that,
.185k ohm= 210*
.45k ohm= 158*
1.8k ohm= 104*
3.4k ohm= 68*
5.7k ohm= 53*
7.5k ohm= 32*
13.5k ohm= 14*
I intend on having (2) resistors. One for street/track use. And one for going through inspection every two years. Obviously inspection=lean (maybe a .45k ?), and I assume maybe a 5.7 (+/-.3) would be good for street use. What does everyone think? Thanks -Randy

 

Just as an observation, my friends TPI Trans Am usually has an intake air temp of 110-120 around town in this fall weather. Hope that helps in some way.

 

My IAT (mounted in my open element air cleaner) usually reads in the 110-120 degree range. I don't know how much of a difference it would really make. If you've got exhaust or some other mods that would require more fuel you might do a little better with a slightly cooler resistor.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

Hmm, interesting. That actually was very helpful information. I forgot to ask that question, but I was wondering what the normal temps would be after I wrote the message. Thanks alot! I think you gave me my answer for DMV inspection. My car runs rich as it is now, so according to your temps a 1.5k ohm would be suitable for street driving, and a lower number would help get me past the sniffer test. I had no idea what temp. the incoming air was at, so thanks again guys. -Randy

 

Im pretty sure the IAT sensor doesnt do a thing to your fuel or timing other than some startup routine but im not sure about that