Flow Control Valve
This ABC Clutch flow control valve allows clutch to slip during quick engagements and reduces shock loads to the driveline. That all results less wear for driveline components and reduces clutch wear. It is designed to balance speeds between crankshaft and input shaft and minimize shock load. Flow control valve is more important on quick clutch activations than fine clutch modulation, so it is even more significant upgrade especially for drifting.
Flow control valve kit includes 3 different orifice sizes - 0.021", 0.028" and 0.040", which are meant to tune clutch disengagement.