Interesting data on 'not so cold' Evo intake

[tholyoak]

So I have an Evo 'cold air intake' modified a bit to seal it off from engine air and mate to the 3.4.

I hooked up my laptop to the car while driving to see what the temp of the incoming air is. Well with the car sitting at the light and an ambient temp of 30F, the incoming air is ~68F. I'm sure the longer it would sit the higher it would go. When moving at a steady 80 mph the lowest the IAT sensor goes is 43F, so about 13F above ambient. I only wish I had done this with the stock box before I had removed it. The 3.4 responds well to freeing up intake but I'm sure even with the mods I have done to seal off the filter from the engine air, the stock box drew colder air and I don't think I would do the intake mod unless I had done other engine mods that would suggest it needed more air.

Todd

[KevinC]

Is the temperature data coming from the ECU via the OBD-II connector? Any idea exactly where the car's intake air temperature sensor is?

[tholyoak]

Yes the data is coming from the ECU, the IAT comes from the MAF sensor

Todd