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
VDC= Vehical Dynamic Control. A sudden change in surface consistency can affect your car's stability during evasive driving. Vehicle Dynamic Control* uses various sensors to help determine your steered path and keep you in control. If your vehicle begins to understeer (plow forward) or oversteer (fishtail), VDC applies appropriate brake pressure to individual wheels and/or reduces engine output to help keep your vehicle on its steered path.