LSD breakaway torques Options

[pcar916]

I have enough mileage on the 40/60 LSD to measure the breakaway torque. Now that the Paul Guard is no longer at GT and having talked to Matt for internal rebuild specs, I have a question for those of you who track that specification.

Excellent customer support by Paul before him, and now Matt, on my diff by the way, but Matt has no way of knowing what Paul dialed into my diff when it was assembled, and I can't find where I wrote it down. He questioned me at length about my driving style and how the car was to be used before building the unit. Now, before anyone brings it up I know there are more things involved than simply overcoming the pre-load created by the Belleville washers, like having more or fewer actual clutch plates, so feel free to include those assumptions in your descriptions if needed...

what breakaway torques (accel/decel) do you clutch-types build into your diff's in our mid-engined machines?

For those who never heard of this the "breakaway torque" is the amount of torque you have to apply to one rear wheel (off the ground) to make it rotate when the other wheel is locked in place and can't turn. The differential has a different number for acceleration than deceleration unless it's setup to the same angle for both directions.

[pcar916]

Read that thread and it's interesting. My LSD is the ramped type so only a bit of it applies, but some reading of Carol Shelby's thoughts on the subject are good as well. I know there is lots of interest in this topic so it might be that folks are just too competitive to let secrets out into the ether.

Drivers who simply tell their engineers or mechanics how they want the car to handle and leave the details to them won't necessarily know. But for those of us who are one-man driver/mechanics/engineers and the pit crews are friends and family, it's a it more of a process.