The Bratex helical LSD's are torque biasing, that is they distribute torque between the wheels, loading more torque towards the wheel with the best traction thus improving performance and driveabitily. Especially in low grip situations.
The helical gearing manages the distribution of friction within the LSD. When torque is applied to the helical gear system it creates force that pushes the gear into the differential body, thus creating friction. Increases of torque, increases the thrust force directly proprotional to the amount of torque. This allows the Bratex LSD to cope with considerable traction imbalance even under heavy power conditions, as would be the case on exiting a powered up corner. But at low torque conditions the LSD can differentiate quietly and smoothly, thus making the differential very suitable for normal road driving. The Bratex LSD uses the popular parallel axis helical geared configuration optimised for even load distribution.
They are designed with a torque bias of 5:1 this means that if  one wheel loses traction then the wheel with the most grip can receive five times as much torque as the wheel that is slipping. However, five times zero is still zero, so all these helical LSD's work best when both wheels are 'planted' and some traction is still available on the slipping wheel. In practice this is rarely a problem as there is always some 'drag' on the slipping wheel, however some drivers expertly use left foot braking to partially lock the spinning wheel.

Vehicle affectation:

Alfa Romeo 145/146/147
Alfa Romeo 145/146 1.4 TS 90HP
Alfa Romeo 145/146/147 1.6 TS 105/120HP
Alfa Romeo 145/146 1.8 16V TS 144HP
Alfa Romeo 145/146/147 QV 2.0 16V TS 150/155HP
Alfa Romeo 145/146/147 1.9 JTD 100/105HP
Alfa Romeo 155/156
Alfa Romeo 155 1.7 TS 116HP
Alfa Romeo 155/156 1.8 TS 129/140HP
Alfa Romeo 155/156 2.0 (J)TS 144/150HP
Alfa Romeo 155 1.9 TD 90HP
Alfa Romeo GT
Alfa Romeo GT 1.8 TS 140HP
Alfa Romeo GT 2.0 JTS 165HP
Alfa Romeo GTV (MK2)
Alfa Romeo GTV 1.8 TS 144HP
Alfa Romeo GTV 2.0 (J)TS 150/166HP
Alfa Romeo Spider (MK5)
Alfa Romeo Spider 1.8 TS 144HP
Alfa Romeo Spider 2.0 (J)TS 150/166HP

Fiat 500 Abarth
Fiat Bravo / Brava
Fiat Bravo / Brava 1.8 16V 112HP
Fiat Bravo HGT 2.0 20V 147/154HP
Fiat Bravo / Brava 1.9 Turbo Diesel 75/100HP
Fiat Bravo / Brava 1.9 JTD 105HP
Fiat Coupe
Fiat Coupe 1.8 16V 131HP
Fiat Coupe 2.0 10V 147/154HP
Fiat Punto 1 (MK1)
Fiat Punto GT 1,2,3 133 HP
Fiat Punto 1.7 Turbo Diesel 60/70/72 HP
Fiat Punto 2 (MK2)
Fiat Punto HGT 1.8 16V 131 HP
Fiat Punto 1.9 JTD 80/85 HP
Fiat Punto 2B (MK2 - Facelift)
Fiat Punto HGT 1.8 16V
Fiat Punto 1.3 MJTD 70HP
Fiat Punto 1.9 JTD 85HP
Fiat Uno MK1 Late (C510 Box)
Fiat Uno MK2
Fiat Uno Turbo MK2 100/101HP
Fiat Uno Racing MK2 112/118HP

Lancia Delta MK1
Lancia Delta MK1 1.6 90/130HP
Lancia Delta MK1 1.9 TD 80HP
Lancia Delta MK2
Lancia Delta MK2 1.8 8V 90/97/105HP
Lancia Delta MK2 1.8 16V 115/132HP
Lancia Delta MK2 2.0 16V 139HP
Lancia Delta MK2 .9 TD 90HP