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David David is offline
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Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,692
Like Jim wrote, it's a pressure loss issue not an actual limit to flow. The bigger you go, the less control you have over intake flow since the throttle body is a control valve. A general rule of thumb is to keep the intake velocity below 300 ft/sec. I calculated the velocity through my stock Carrera TB to be right at 300 ft/s at max power so I decided to keep it so I'd have good low speed drivability.
2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)
Old 04-20-2007, 08:06 AM
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