09-27-2005, 05:25 PM
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#41 (permalink)
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vehicular thaumaturgist
Join Date: Apr 2000
Location: Woburn, MA
Drives: 1994 Stealth TT
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Re: Measuring stock exhaust restriction
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Originally Posted by twiceblown
okay, Chris, so with the #s you supplied for flapper and diaphragm area, i come up with:
flapper diameter / diaphragm diam / Flap Area / Diaphragm Area / Stock Actuator Spring Pressure / Turbine Housing PSI / Flap PSI / Diap PSI / Ideal Actuator Spring Pressure
34.00 57.00 1.41 3.96 7.00 30.00 42.23 27.70 10.67
38.00 57.00 1.76 3.96 7.00 30.00 52.76 27.70 13.33
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You're missing something. The effective diameter of the flapper is actually less than the overall diameter. The flap may be 34mm, but the PORT is only 29-30mm. I was assuming flap diameter - 4mm (29mm=stock, 34mm=TRE, 38mm=bullseye).
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The Pansy Patrol - a 3000GT/Stealth car blog with how-tos
Pearl Yellow 1994 R/T TT w/84k - FOR SALE! new 4-Bolt factory short block, DR StgII heads, Titan TD05 headers, 14B turbos w/ ported 7cm^2 housings, 3" minimum-bend catless exhaust, SCE oil pan, RPSII clutch, Fidenza flywheel, OZ F1 Plus 17x9.5" wheels, Kumho Ecsta MX 245/45 tires, Drweldin DSM SMICs, 3SX engine mounts (Maximal solid front), GReddy 60mm P/H/W boost, Carbotech Panther Plus & Bobcat pads w/ slotted/drilled rotors, KSport GT-Pro coilovers, Maximal rear camber arms, SCE balljoints, ABS delete w/ cockpit-mounted Wilwood proportioning valve, AC delete, EGR/evap/dashpot delete, cruise/vacuum-tank delete, '95 Lexan headlights, McCulloch 4300K HIDs, GReddy Type-S BOV, solid shift bushings; Misc Parts: Walbro341, 20# fixed-back seats, Accelerated Moto catch can
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