I have a 99 4.8 ext cab short bed 1500. This past week has been the hottest it's been all summer with the heat index at 110-115*. I ran the stock intake for a long time but I aquired a spectre intake through a friend. My truck has been actin like a true pig taking off. If the truck is not hot, and I don't sit long, iat will set at about 99*. if I shut it off and start it up the IATs are about 130* after I start moving all the lower they will go is 110*. my timing table is set conservatively but none the less I know those temps are high. Is there anything I can do to drop IATs more? The intake tube is metal and always is hot. Would heat wrapping it work?

 

It would help...

You could also relocate your IAT sensor so it reacts to the temp change faster. The factory one that is built into the MAF sensor with that silicone goop on it, is slow responding.

 

Post up a pic of your airbox. I bet the filter isn't sealed off well at all, and you're pulling in a ton of under hood heat.

 

The box I don't think is the problem. I think it's the metal tube holds a lot of heat. Is there a write up on relocating the iat sensor

 

where do you relocate this sensor to? with the maf and iat up near the air box it's reading the coolest air possible before it gets heated in the tubing and intake manifold. locating it any further downstream is just going to raise the temp it reads which may be good because it would be more accurate. further upstream in the air box would just increase the differential between what it reads and actual temp the engine is receiving. that would in turn affect the engine's compensation for air temp. the iat in its current position is not reading the air as it has been heated by your intake tube, 110-130* is the temp of the air you are getting and the tube is heating it more downstream of the sensor. that's life in texas. open the box to a greater flow of fresh air and try to insulate your intake tube are the only options i can see.

 

i wraped my intake tube with Araflex(refrigeration piping insulation) i got from work. my Air intake temps are usualy about 10-15 * hotter than ambient. but that armaflex is the best way to wrap it imo. it usualy has a r4 or r6 value.

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you can use this, but will take a few passes to get the job done. i also recomend covering alll of this with foil tape

As far i know you can lower the air intake temp lower than ambient air temp with out some sort of cooling means.