Originally Posted by Whiteline

Like many other modern vehicles, the 2003-2006 Nissan 350Z is equipped with an electronic stability control system; Nissan has two systems depending on what trim level your 03-06 350Z is. The Enthusiast Z has Traction Control System (TCS), while the Track 350Z is equipped with Vehicle Dynamic Control (VDC). Both systems achieve similar results but do so in different ways. TCS reduces engine speed (throttle cut) when the computer detects that a wheel is spinning at a disproportionate amount to the speed your Z is traveling.
VDC uses throttle cut and additionally limits the amount of wheel spin allowed by using a Brake Limited Slip Differential (LSD) based on data from a Yaw sensor. The Brake LSD system goes into action when one of the drive wheels is spinning on a slippery surface by braking the spinning wheel to redistribute power to the other, non-slipping drive wheel.
While Nissan is nice enough to give you an "off" button for both of these systems, they never are fully disabled. Whiteline's Black Box solves this problem by allowing you to electronically tune your Nissan 350Z's TCS/VDC to give control of the amount of wheel spin. The patented Black Box system is unique in allowing cockpit adjustable handling bias, a single dial delivers more oversteer or understeer on demand. Only Whiteline's Black Box lets you tune the amount of TCS/VDC intervention and even turn off stability control completely, without error codes or warning lights.