Well since you haven't TUNED your IAT curves, you don't know what your engine actually needs. The stock table is garbage.Aaron wrote:True enough, but so far so good. The IAT doesn't change that much in the tables run.
For the CALCULATION that derives MAF from a hot wire sensor, you ABSOLUTELY must know air temperature. Fortunately for you, this is handled directly within the sensor.Aaron wrote: The IAT doesn't change the MAF or VE tables at all, just timing. Otherwise my A:Fs would be different everyday. They aren't. And they'd have changed when I ran my Z34 on the dyno with the stock IAT, without an IAT, and with a GTP IAT. They didn't.
Speed density systems are DEPENDENT on IAT for the correct air density calculation. I have dyno sheets proving THIS.
What you seem to think is a lack of dependence on IAT, I see as you having a really fat tune that just doesn't care.Aaron wrote:As soon as my IAT is moved into the correct position, then my PCM is correctly tuned, and a change in ambient temperature won't affect my tune at all. However changes in ambient aren't affecting it as-is. I ran it this morning, 45* out, ran perfect. Drove it again this afternoon, 75, ran perfect. A:Fs didn't move at all. Ignition timing probably did, to some minute degree, as it was supposed to.
Also, you didn't LOG your ignition timing today, so you don't KNOW what your ignition timing did. Any claim you make about it is a Wild Ass Guess (WAG) straight out of ignorance.