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Old 05-27-2004   #18
JasonR
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I am going to explain in detail so this makes sense. Awd drive GSX has a center differential and Viscous coupling with Limited slip differential. When GSX encounters slippery conditions, power is apportioned to the wheels with the best traction. All of this happens seamlessly as the driver rockets around a corner in control. When you dyno you need the viscous coupler eliminator, otherwise you will destroy your viscous coupling. You can weld the center differential, but then tranny comes out and more costly and time consuming. Easier to get viscous eliminator. The problem with AWD cars is you can't run them on a 2-wheel drive dyno. If you tried, you would destroy the center viscous coupler that transfers power from front to rear. Viscous eliminator is easy, install in place of your viscous coupling (which I mentioned before to keep for street driving), so you can simply disconnect the rear driveshaft and run the car on a two way wheel dyno as a front-driven. Now the VCE will give you a permenant 50/50 front-rear torque split, which is good for launching or rally, but not turning. The car on the street under conditions when turning or slipping changes torque split from 50/50 to 70/30 or 30/70 or whatever it supposed to do and the center diff and lsd help control traction. If you turn with vc eliminator in, the car will suffer and shutter allot cornering and that is hard on drive line as I mentioned before. Viscous coupler is a silicone liquid in a casing connected to shaft with inner and outer plates around a hub in the coupling housing. Use regular differentials in conjunction with the vc where the vc functions as a diff lock that acts automatically when conditions need it. Where AWD (which is superior to fwd), a permanently engaged 4-wheel drive system needs to have differentials to enable it to apply power to four wheels and be able to turn without resistance. The distance traveled by turning front wheels is not the same as the distance traveled by the non articulating rear wheels. The vicous coupling limited slip differential divides the torque splitting between front and rear. This is why it is damaging to run on street with the VCE in, but fine going straight. Hopefully this clears up why need VCE. Get it through Machv and I can show you quickly before you drive to dyno. Only takes 1hr with tools.
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