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Originally Posted by RubHer Yellow Ducky
for the past year thread after thread has talked about cold air intakes...
AND
for the past year I and others have told people the H-3 comes from the factory with cold air intake. Take a couple of minutes and trace it while looking under the hood. It feeds from (within) the right front fender, not from under the hood.
RYD
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It's not true cold air but does not directly breath warm engine compartment air. On an 80 F day, measure the air inlet temperature (IAT) with an OBDII scanner after pulling out from a 1 minute red light and you see the IAT reach 105 F or so. While you are moving the IAT will cool down but will still be +10 F above outside air.
GM tries to breath from a fendewell, or duct air from outside on mostly all their vehicles.
If you have a dark color H3 like black, the fenderwell area will get a little warmer.
Aftermarket systems tend to breath in more warm engine compartment air. You have to analyze the impact of a higher volume of warmer air on the otto cycle PV cycle to see if you gain or lose.
I've modified mine to truly breath outside air. My IATs are about 2-3 F warmer than the outside air.