By mechanically linking the turbine towards the pump, it produces a ‘lock-up’ problem, effectively reworking the fluid coupling into a rigid coupling, akin to your locked handbook transmission clutch. And not using a clutch to lock up the torque converter, the turbine can even now rotate around approximately 90 % https://torque-converter-clutch04702.blogsumer.com/33196792/a-review-of-torque-converter-clutch