weedeater: it does! That's why the car went into limp mode when the charge pressure spiked.
GD?: you stand corrected on what? i think that msuave's account agrees with our explanation other than the fact that the sensor deals with density on it's own (I assumed it used the BARO, but it self-compensates).
In terms of the air temperature... I'm not sure that the "constant temperature" that the system keeps the wire or film at is really constant... it may be a reference that's set to a specific number of degrees above ambient temperature.
Also, as for heat transfer, convection heat transfer (what you get from moving air) is proportional to delta T, so if the wire is kept at a temperature which is a constant value above ambient, the heat transfer properties should remain the same regardless of the actual ambient temperature.
It's been a long time since I took heat transfer.
But I'm 95% sure this is right!
-davin