The thing is, it is the arguement. You are saying that the IAT sensors heat up rapidly in the staging lanes. I disagree and said what to do. I will say that you are correct and sometimes something happens and it does not always work out that way. However, most of the time if it does not work out, you end up shutting your car off because you are going to be waiting no matter what.Originally Posted by Reptile
Anyway, I am doing a mini res of this post cause, of course he would, wizbang made some points about his CAI box and IAT sensors.
If the WizAired CAI System is installed according to the installation instructions and have the air box weatherstripping sealing around the edges, then your engine is breathing air very near ambient air temperatures regardless of what the IAT Sensor is reporting. The reason why the IAT Sensor is not accurately sensing the intake air temperature is because the sensor is horribly designed to accurately measure just the air temperature. Unfortunately, the IAT sensor's sensing tip is not thermally isolated from the sensor's body. Consequently, the sensor's response is highly affected the temperature of the sensor's body, which hangs out in the engine bay. This is especially true if the engine bay is hot and the sensor is allowed to heat soak after driving. The hotter the engine bay, the higher the temperature of the sensor's output (induced temperature measurement error). Another problem with the OEM sensor is its response time to temperature changes. When we would rapidly change the intake air temperature, we reported a slow response by the OEM IAT Sensor. We discovered these problems with the OEM IAT sensor early in our research and development of an intake system for the GM W-Body vehicles. To resolve this IAT sensor error problem, we abandoned using the OEM IAT Sensor and used a fine wire thermocouple measurement system that uses an ultra sensitive and accurate sensing of the air stream entering the throttle body.
Unless the PCM is programmed with an aggressive IAT vs Ignition Timing Adjustment Table, then the IAT Sensor reading has inconsequential effects on the engine's performance. The OEM IAT Sensor is good enough for the purpose GM designed it for, that being to measure large changes in intake air temperature. It was not designed to accurately measure small changes in intake air temperature. The only benefit of getting the IAT sensor to read the air temperature accurately is for scanning and seeing lower air temperature numbers. If you wished to have your OEM IAT Sensor reading the intake air temperature more accurately, then we would suggest relocating the entire IAT Sensor into the air box and have only the wires/harness protrude through the air box. This sensor arrangement will allow the sensor to be immersed in the intake air and more accurately measure the actual air temperature. However, this relocation will not affect the slow response of the OEM IAT Sensor. That is inherent to the sensor's design.
This statement is absolutely incorrect. The insulation used on the WizAired CAI is highly effective and is has excellent reflective properties. The insulation has a a reflectivity of ~97%. This means it has a thermal emissivity of ~3%. This means it will be very poor at heating the inside air through radiant heat transfer and that's a good thing/property to have in the system. The insulation factor for the material used is ~R4.7. This is approximately equivalent to 1.7 inches of fiberglass insulation used in homes. The insulation is located on the inside of the air box for the variety of advantages it provides over installing the insulation on the outside.... Once the components heat up, the flimsy insulation (non reflective and on the inside) does zip.
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