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As I once measured
http://www.stcf.net/intake/
the static pressure drop over the filter is "marginal" when compared with the total static pressure drop in the whole intake. Currently I dont have the resonator intact, ie there is just a tiny piece of pipe in front of the box so its restriction does not exist any more.
If and when the case is as posted the MAF alone with its nets is the biggest restriction in the intake system and as long as you can remove it you will never dramatically reduce the static pressure drop no matter what type of filter combo you put in front the MAF. In my installation there is a strait pipe between MAF and comprssor and it does not create restriction in the same way as a convensional cobra does.
So once again we are climbing butt first up the tree if too much focus is laid towards one part in a complex system, especially if that part is not a bottle neck to begin with. Just like in that test if the pressure drop across the filter would decrease lets say by 10% the total would ONLY decrease by 1.5%.
Please note that the measured values in that test are max values measured against rev limter.
So to your gueston, yes you would most likely see some difference in the curves also if you where to remove all the components from in front of the compressor, including the MAF, but the measured 80mBar max static drop does not indicate that the is much to be found.
also when you think of spool-up logically the airmass flow is kind of small (low rpm, no boost/ low boost) and if the std filter would already be restricte, how restrictive would it get once flow later increases with boost and rpm to ten times higher rates?
ps. the static/dynanic pressure drop was discusssd in the past and until someone offers more than theory why the static pressure drop alone is inadequate indicator of restiction please save it :)
posted by 212.246.64...
, Mon, 5 Mar 2007 21:33:25
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