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TZ 197 TZ 197 is offline
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Join Date: Mar 2009
Location: San Jose, CA
Posts: 94
I've spent countless dyno hours working out velocity stacks and filter area on motorcycle applications. Biggest gains were not in overall filter diameter/area but providing air directly over center of stack draw. Also the further the filter top away from the opening the happier. Funnel shaped aids inside closed filter ends helped when it wasn't possible to use open tops. Just to note this was using oiled K&N's.

When talking airboxes, they typically improve driveability by slowing the air pulses in the mixing area, but might not be as relevant in a porsche aplication with injectors downstream. Possibly a oiled foam filter panel retrofitted over the metering plate could improve airbox performance and enhance metering area draw.

If building a race car I would experiment with a velocity stack on the metering unit and run it through the deck and seal. Then make a still airbox out of the cargo deck area and pressurize with external ducting.

Food for thought, now get out your sawzall!
Old 10-12-2017, 02:53 PM
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