ORIGINAL: mopowar

You use a cold air setup to get a denser air mass to mix with the fuel. When the air gets too cold- or dense- your pcm has to throw alot more carbon (gas) into the mix so that your truck doesn't **** al gore off.Say you were to optimize a cold air setup so that your iat (even correctly positioned) were to read just 5-10 degrees over ambient temperature; This would work great during most of the year in most of the country, but during the months when ambient temperatures are ~ 50* your dumping dense60* air across your iat sensor and through the motor where the final al gore test shows up on your 02 sensor. Essentially, the more 02 and co2 you have thrown in the more Cv8Hv18 you are going to have to throw into the mix to keep al gore happy. So, if during the cooler months one were to switch from an induction system that had provided 60* air to a system that provides say 100* air, at that point less Cv8Hv18 would be required to keep al gore happy. Conversely, when temperatures get higher and the same system that provided the 100* air in the winter starts to provide 150* air in the summer, power will suffer and you will once again start to **** al gore off because you will hold his limo up and once again suffer poor fuel mileage.