Quote:
Originally Posted by danhr
again, heat soak is not a part of the DA. you are confusing a hot engine with an engine in a hot area.
DA is calculated by elevation, humidity, temperature, and barometric pressure. those four factors and those four factors alone
and lower DA does not necessarily mean lower IAT
Example:
0 elevation
31 in Hg barometric pressure
0% humidity
60*F
equals -1149 DA
0 Elevation
29 in HG
95% humidity
60*F
equals 1350 DA
same elevation, 2500 difference in DA, but you will get the SAME IAT's.
again... try playing around with a DA calculator... you might learn a thing or two.
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The major ingredient in DA changes is temp. 80 degree day (High DA) higher IAT's measured in a NA engine intake track before the throttle body. 60 degree day (lower DA) lower IAT's measured in the same NA intake track. Late supercharged cars (GM), have IAT1 and IAT2, 2 being after the supercharger probably wouldn't register a lower IAT2 temp on a 20 degree ambient air temp swing. I agree I could always learn more, and the basics that I do somewhat understand have treated me well.