Originally Posted by
Chip
Its supposed to be a measure of the temperature of air going into the air filter.
Where you choose to get a reading from to represent that is a matter of some debate, but not a lot, essentially it needs to be somewhere between the air filter and the dyno wall, where you think it best respresents the actual temperature of air that will go into the air filter, often putting it to close will result in it picking up radiant energy from hot engine components that will make the sensor hot but wont heat up the air going in to the same extent.
Im with Gary in that two far away is better than too close if you have to be either.
On a turbo car, putting it AFTER the turbo is always going to make it think the air coming into the air filter was hotter than it really was as the turbo compresses the air, which heats it up! (pv=nrt)
ok, got that, understood the mechanics behind it, now for a different question
where does the car manegement take it's reading from?
assuming it would be at the same place due to it wanting to know how hot the air was etc if that's one of the paramiters invovled in engine fueling
and
i'm sure i've read on some tests for i/c etc, the air going into the engien is virtually as cold, if not colder, than the ambient before/after
or
is this for rolling road runs for pure power figures as opposed to rolling road runs for mapping etc?