Torsen vs Quaife

[JeffYoung]

Steve, I assume higher torque cars need more breakaway torque?

[Ron Earp]

I thought the 2:17.1 at VIR was the clutch pack and 3.7?

It was.

What I am telling you is I can't get the 3.7 clutch pack diff, the one I just pulled out of the car and we've been running for 1.5 years, to break away even with applying 175 ft lbs of torque to it here on the bench with the R180 breakaway tool. That is why is behaves like a welded diff - it IS EFFECTIVELY welded from what I can tell. And this is cold.

[924Guy]

You always run the lightest preload you can and still hook up. My CMP setup has 30 pounds breakaway when cold.

Please clarify?

[seckerich]

The preload on a clutch diff just gives it enough to not spin when one tire is unloaded. With both touching the ground it uses the ramps inside to add pressure as you accelerate and also controls lock on decel to steady the car under the brakes. Too much and it pushes like a pig (rear wheel drive) and too little it will wiggle and cause one tire to back spin and pitch the car. There is a lot more to them than just the breakaway torque.