Quote:
Originally Posted by SlowOne
I'm not sure what Kayce means by slip in the diff. If it means lossening the diff until it slips when you punch the throttle, then that is not good advice. A 12th diff must never slip at all under any conditions. It must, as Kayce says, be smooth as silk in action.
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NO, what I "mean" is that when holding both rear tires you should be able to get the diff gear to move (even a little) for your initial setting - and then adjust it on the track depending on available traction (tighter on high traction surfaces, looser on more slippery surfaces). In my experince, diffs that don't slip at all just end up making the car harder to drive, and wear out diffs (diff balls, diff rings, bearings, etc) prematurely.
If balldiffs weren't intended to slip, then we'd all still be using geardiffs like they were back in the good/bad old days. 
Again - we're just going on personal preference here, not sure there's a right or wrong answer, as in driving other top racers' cars nobody's going to be set exactly the same and nobody's going to have the exact same tires, set-up, or diff settings.