I need to find a place to put my IAT. Somewhere out of the way in a cool place. I am considering the bottom of my airbox. How big of a hole would I need to drill for the IAT grommet? Could I put it in the intake somewhere? I am open to suggestions.

 

you should put it where it belongs. if you put it elsewhere it may give wrong readings. if you are not concerned about wrong readings replace with a resistor and give the PCM a 'temp' of -40 for 'more power'. all this does is trick the computer into seeing an intake of -40*c and dumping fuel in.

same with the 160* t-stat. dump fuel....'more power'...

 

Where it belongs is in the elbow. I don't have one. I was only asking about possible locations. Ideas or pics specifically. I can't put it in the air tract because there is no room in the rubber peices.

 

There is no downside to moving the IAT sensor in a mass-air setup. It is not used to "dump fuel".... its used to eliminate about 3-deg of timing advance when the sensor reads high air temps. Unfortunately, the stock location promotes heat soak of the sensor, and may cost you the timing advance even if the air isn't really as hot as the sensor indicates. Relocating it away from the engine heat soak can provide improved performance, and not because its "dumping fuel". I put the sensor in the cap on the K&N filter on my Callaway CAI. Worked fine. Get a grommet that fits snuggly over the sensor. Then drill the hole size that corresponds to the diameter of the grommet.

In a speed-density setup, you need to know the exact temp of the air entering the manifold to get the correct "density" part of the equation. Again, the sensor may experience heat soak in the stock location and hurt you by reporting the incorrect temperature. I'd put more faith in a sensor that is not being heated up by external engine heat.

As far as the 160* T'stat, it doesn't work by dumping in more fuel... it works because there is less heat transfer to incoming air charge, enough gain in cylinder charge density to offset the loss in thermal efficiency caused by the higher combustion chamber heat losses to the coolant.

 

Who puts a 160* stat in for more power anyways? I did mine cause LT1s sometimes run hot. Now with my 160* Stat, on 85 degree days, sitting in traffic, it never goes more than 1/8th way up the guage. If for no other reason, the piece of mind that it doesnt run on the hot side in traffic makes it worth the money.

 

My sensor is laying loose right now and i want to put it somewhere it can function properly. I will swing by the dealership and pick up a grommet for an LS1 car. I imagine the best place for it would be my ram-air box. Does anyone have the part number handy for the grommet? I just want it to be right.

 

You don't need to go to a dealer for a grommet. Take the sensor, go to an auto parts store, and test fit the grommets they have. It will cost you a few cents, compared to the dealer charging you several dollars.

Now you mention that you have a "ram air box".... what kind of box? A factory style 4th Gen WS6 box, or something that hangs under the bumper? It would help if you included info like that in your initial post, so people could give you correct answers.

Also, what year is your LT1 engine and PCM? You need to add that to your signature, to get good answers. Not all LT1 engine/PCM's are the same.

 

I included a link in my sig that has pics. It is a 95 PCM and an aftermarket box mounted on the radiator support.

 

I got it. I found a grommet for a PCV valve at the parts store. I mounted it in my airbox where it can get relatively cool air.

 

When I was using the CAI, the sensor in the elbow seemed to get super hot from the engine heat. With the WS6-style airbox, the stock sensor location doesn't show the same heat soak. I had to add a second sensor, because I have to feed both the stock PCM and an aftermarket ECU. There's also a second coolant temp sensor mounted in the return line from the rear of the heads.

 

That is almost exactly how mine is mounted. Maybe I have seen that pic before and subconciouslt referenced it. The grommet I found was for a Honda, but it works perfect. I had to drill a 3/4 inch hole for the grommet, but it looks factory and I am happy with it. Is there a way to read from this sensor when scanning? I don't remember seeing it the last time I scanned, but I was more focused on a missfire.

 

Scanner should show it. Some scanners will call it "IAT", others may call it "MAT" (manifold air temp). Datamaster calls it "IA Temp". Scanmaster calls it "ATS".