Having run hundreds of tests on the. effect of 2-valve throttle body upgrades on everything from stock to supercharged combinations. (both centrifugal and positive displacement), it is safe to say that throttle body upgrades on the 2-. valve motors are a worthwhile endeavor.
VDC may refer to: In technology: Virtual design and construction, modeling software and techniques to design and evaluate possible construction processes; Volts of direct current; Video display controller, a computer graphics chip; Vehicle Dynamics Control, a means of increasing vehicle stability through a combination of throttle restriction and braking
Jay: VDC is Vehicle Dynamic Control. When this is on, it won't let the wheels spin. It slows them down by the ABS system and pulsates the wheel. So example is if your stuck in the snow. If the VDC is on, you won't be able to sit there and spin your tires.