BANNED by Kris
Join Date: Oct 2011
Location: Pasadena, CA
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It's in the design of the wheel. The OBS (Wicked Wheel) wheel has every other flute at a different height so that it takes big scoops of air but half as often. The SD wheel has all the flutes the same length taking half as much volume of air but twice as often. So either way the wheels are moving a relatively the same amount of air. SD surging has more to do with the late 7.3L's inability of their engines being able to consume the air that is being produced. Having a tiny turbine housing with a poor wastegate design leads them to produce massive air too low in their power band and the air backs up in the intake plumbing. Instead of fixing the problem the correct way (like the aftermarket has) people went with the OBS wheel that will allow some of the air to creep backwards when in over-boost rather then fighting/stopping the exducer as the SD does. Hence, lower boost but smoother power. Surging doesn't happen on the top end, it happens while the engine is climbing from the depths. Ford (well Garrett) fixed the 6.0's and newer by cutting holes in the compressor housing to allow the over boost to vent back into the air cleaner tube.
-'97 Mini Monster
-Bean's: 160/100 (FF Injectors), 2/ 6-POS chips (TW & Beans tunes), Overboost controller, E-Fuel
-BANKs: downpipe, full exhaust, gauges, intercooler
-Irate: T-4 kit, IC pipes, 3" Irate Plenums, BASB Turbo
-Stage II trans.
-Mag-Hytec trans. and pumpkin covers
-6637, CCV, IDM, 6.0 Fan, 49-Federal PCM swap, MAP line Mod
-370 Amp alt., 40k trans cooler, ADRENALINE PUMP
-twin on-board air w/ 10 gal. tank
-'15 F350 6.7L DRW 4x4
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Last edited by BigFuel; 08-21-2012 at 08:38 AM.