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A few years ago we had a 3.5 on the dyno with PMO ITBs. We had the chance to dyno 2 different set ups. I don't have the sheets, like I said, it was a few years ago. But, we tested the often thought of restrictive "rain hat" set up vs open velocity stacks with no filter. The thought of "worst" vs the "best" in terms of power. We saw no measurable difference on that particular motor. Yes, one sample size done back to back within an hour of each run. We did post something regarding that tidbit at the time. For years there was lots of hyperbole about what filter flowed best and what cost you power. Lots of "white paper" type thinking. So we had the chance to do a ONE time test with ONE motor combo, so we did.
A filter on an ITB motor hurting performance means everything else in the complete engine system is dialed to 110% and drawing more air than the filter can deliver without restriction.
I wish we still had the dyno plots. Maybe we will going forward with engines that see the dyno...
Anyways, food for thought.
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Turn3 Autosport- Full Service and Race Prep
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997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3
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