full APS intake - Page 2 - Subaru WRX Forum
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post #16 of 17 Old 03-01-2006, 05:17 PM
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Originally Posted by Cosmo
The only problem I see with that is that it feeds into the airbox. For a velocity stack to work correctly, the open end needs to be the widest point of the intake tract. That one feeds into the airbox, which is a higher volume than the stack, so any advantage gained by the stack would be counteracted by the air slowing down when it hits the airbox.

It may have the advantage of shortening and straightening the intake, but it won't function like a true velocity stack. Of course, on a forced induction engine you wouldn't notice the difference a true velocity stack creates anyways...
Actually theoreticly its allowing more air to be fill the box faster considering as well i've opened the inlet hole from the stock 2 3/4"-4" and its not hiting the airbox.Its not a "ram air".Air is not being pushed in,its being sucked in.Big difference.The big stack is feeding the stock velocity stack in the box.Why wouldn't you see any gains with a velocity stack?It helps create and maintain lower air pressure in front of turbo.
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post #17 of 17 Old 03-01-2006, 05:26 PM
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Quote:
Originally Posted by mosc
the problem is not that you cannot recalibrate things with a piggyback, it's that the flow through many aftermarket intakes are not as consistant as the flow through the stock one which the MAF and ECU are designed to work with. The irregular flow causes problems that the piggybacked ECU cannot deal with.

btw, that is completely just respouted cosmo wisdom.
True about the irregular flow,but not all of them.
The CAI arguement explained...
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