Due to the fact that a Helical LSD can act as an Open diff when there is a loss contact with the surface of the road, these are not generally good for drifting, because mid drift, when you want to be able to modulate power, the diff may be sending power to the wrong tire because of the very low friction it is receiving. Kind of weird but, honestly a VLSD is better for drift than a HLSD, and a Clutch type is better than both..
For grip road racing, HLSD is better than a VLSD because the vlsd will be locking harder out of the corner, where as the torque biasing will be just about perfect in the HLSD. Will allow you to get on the gas earlier, and essentially lead to higher exit speeds.
I'm not sure how all that translates to Clutch types.. It seems that clutch type LSD's are the best for Drag racing, and Drift. HLSD is best for Grip driving, and worst for Drift. VLSD is a good all around in between Differential.
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