The differential was the next area to be upgraded. The factory LSD is a GKN Super LSD which uses a tapered friction surface (taper ring) integrated into the side gear. As with the suspension this worked great when the car was natural aspirated but I didn’t like the lockup characteristics with the extra torque from the supercharged motor. Also, these diffs are known to wear quickly and break the tabs of the taper ring in higher power applications.
The OS Giken Super Lock LSD was selected in a 1.5-way configuration to replace the factory LSD. The OS Giken is a mechanical clutch type differential which has a higher number of clutches than most other options. This helps smooth the transition to 100% locked when power is applied but also quickly unlocks on corner entry. I am very happy with the LSD so far.
