Originally Posted by clintfocus

really depends on the scenario, from on track testing ive been involved with over here at Buttonwillow raceway park in socal, A properly setup Clutch type LSD on a 2WD car is anywhere from 1 to 2 seconds faster then a torsen gear type LSD on a 2 min average lap time track. Compared to a open diff the time improvement should be more. Of course slicks over stock tires would prolly be a 4-5 second improvement, but good diff AND good tires would be a huge jump.