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That's absolutely true, UberRoo. I figure that at 6000 rpm the engine is drawing about 350 cfm of air (the volume of air at standard temperature and pressure would be a little less because of reduced pressure in the intake tube). The inside diameter of the intake tube is about 3", giving it a cross sectional area of about 0.05 sqft. That means the average velocity in the intake tube is about 7000 fpm. Pressure drop across the intake tube at that flow is about 0.03 psi, including the bend, but not including the corrugations (I can't figure that until I do the CFD). An equal pressure drop through a 1 inch tube would yield between 16 and 18 cfm (only about 3200 fpm average velocity). So, even though the cross sectional area of the 1" tube is 11% of the 3" stock intake tube, the flow rate through it would be only 5% of the amount flowing through the main tube at 6000 rpm. That's because the wall/flow area is so much greater in the smaller tube, so that frictional losses rise much more quickly in the smaller tube as flow and velocity increase.
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95 LS-i Red, 31,xxx; bone stock for now; Daily Driver
94 LS-i Emerald Pearl, 106,xxx,; 246 whp; Tomyx snorkus and HKS Cold air intake; PWR aluminum radiator, silicone hoses; Inline thermostat; enhanced coolant routing; external power steering and oil coolers; Phenolic intake manifold spacers; 2004 WRX 5 speed transmission; ACT Clutch Kit, Heavy Duty Pressure Plate, Lightweight flywheel, performance disc; Group N motor mounts; ‘07 WRX 4-pot front calipers, cryo-treated slotted Tribeca rotors; Hawk HPS ferro-carbon pads; Frozenrotor rear slotted rotors; SS brake lines, Axxis Ultimate pads; Rota Torque 17x8 wheels; 245/40-17 Bridgestone RE01-R's; Koni inserts with Ground Control coilovers, Eibach springs; K-Mac camber/caster adjustable strut mounts; Urethane swaybar bushings; Bontrager rear sway bar; Urethane differential bushing; Custom Whiteline adjustable rear lateral links; Outlaw Engineering forged underdrive pulley; custom grind Web intake and exhaust cams (11 mm lift, 250° duration); solid lifters; CP custom aluminum forged 11 to 1 pistons, Brian Crower coated SS intake & exhaust valves; Brian Crower upgraded springs w/ titanium retainers; NGK sparkplugs; RallyBob (Bob Legere) ported and polished cylinder heads; Eagle H-beam rods; ACL Bearings; Cometic Head gaskets; ARP head studs & fasteners; Hydra Nemesis EMS; Wideband O2 sensor; 740cc Injectors; Walbro 255lph fuel pump; Upgraded WRX starter; Equal length SS headers (3 into 1); dual Magnaflow cat converters; 2 into 1 into 2 SS exhaust with Bullet muffler; OT Fiberglass hood; Oil pressure gauge; Programmable shift light,
2017 Subaru Forester XT, metallic dark gray, 29,xxx
2005 Porsche 911 Turbo S Cabrio, 24,xxx
2006 Subaru Outback LL Bean, 166,xxx sold
92 LSL Dark Teal, Smallcar Shift Kit - sold
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