Drift tuning : Drive Train
A proper mechanical limited slip differential (LSD) is almost considered essential for drifting. Attempting to drift with an open or viscous differential in a sustained slide generally yields relatively less impressive results. All other modifications are secondary to the LSD.Two popular LSD brands amongst drifters are OS Giken & Cusco.
The most preferred form of LSD for drifting is the clutch type, in "2-way" form, for its consistent and aggressive lockup behavior under all conditions (acceleration and deceleration). Some drift cars use a spool "differential", which actually has no differential action at all - the wheels are locked to each other. Budget-minded drifters may use a welded differential, where the side gears are welded to give the same effect as a spool. This makes it easier to break rear traction because it reduces maximum traction in all situations except traveling in a straight line. Welded differentials have an inherent risk involved, due to the tremendous amounts of internal stress the welds may fail and the differential completely locks up leaving the rear wheels immobilized. Helical torque sensing types such as the Torsen or Quaife (available on cars in certain stock trims such as S15, FD3S, MX-5, JZA8x, UZZ3x) differentials are also adequate.
The clutches on drift cars tend to be very tough ceramic brass button or multiple-plate varieties, for durability, as well as to allow rapid "clutch kick" techniques to upset the balance of the car. Gearbox and engine mounts are often replaced with urethane or aluminum mounts, and dampers added to control the violent motion of the engine/gearbox under these conditions.
Gearsets may be replaced with closer ratios to keep the engine in the power band. These may be coarser dog engagement straight cut gears instead of synchronised helical gears, for durability and faster shifting at the expense of noise and refinement. Wealthier drifters may use sequential gearboxes to make gear selection easier/faster, while sequential shift lever adapters can be used to make shifts easier without increasing shift time.