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Originally Posted by 03COBRA/06ZO6
I keep hearing about cold air kits and high flow air kits but does anyone have any real data showing a hp/tq gain.
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Since the C6 Z06 already has a small fresh air inlet on the hood, it probably does at least a decent job of
cooling the air that's drawn in at the filter. (A more direct path might help a little here - but no way to tell without testing. Remember, the factory hood air inlet has to pass some pretty severe water ingestion testing, that's why it's not just a direct opening. For that matter, induction noise also has to be kept within certain limits.). The next variable is how restrictive the factory element is - I have no data on that - but the filter does appear to have a large surface area.
As for so-called "ram-air" - well, that's really a myth. You'd have to be doing over 200MPH to see much effect here... in fact, at that speed the "surplus overpressure" (as I call it) nets a maximum of 0.71 psi - or about a 4.7% increase over std. atmospheric pressure. That means an air charge density increase (which is what counts) of only about the same amount.
Temperature is always the
much more important variable here. As an example, going from 180F (say, underhood air) to 70F (room temperature) gives a density increase of nearly 21% - huge by comparison.
Bottom line - if you can reduce the restrictiveness of the stock element (and we don't know how restrictive it is without a flow test) - and if you're not worried about water ingestion - you'll probably see a bigger gain from that alone than with any "ram air" system or even with more "cold air", since there already appears to be a feature on the vehicle that should lower the inducted air temperature signifcantly.
I'd like to see the data too.......
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