[Ant]

Originally posted by Gary C
Again, in road racing/auto-x situations where you will want the outside tire *with more weight on it, thus better traction* to get more power than the unweighted inside tire, the phantom grip is virtually worthless as well. The tractino imabalance is high, and your inside tire will still get the majority of power since it has the path of least resistance.

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You can chose from a # of different weight springs to adjustr the amount of lock up between the gears and the housing. You need to chose them according to what you ulimately use the car for.
Torque transfer is not fixed with the Phantom Grip, it adjusts according to the driving condition. During cornering with neutral throttle the blocks will push up against the spider gears and provide a modest amount of resistance. However, (this is a quote from a tech article as they installed the PG on a Neon):
"as the need the to limit the torque transfer increases, like when 1 wheel really starts to spin, the blocks pivot about the pinion shaft, twisting and wedging hard against the spider gears to to provide more lock up to transfer torque to the tire with more grip. As an added benefit for road racers and autocrossers, this resistance to torque transfer helps keep the inside wheel from locking up and flat spotting when trail braking occurs."
If I had an option I would certainly opt for a Quaife differential. But, the cost is MUCH more and the installation is more technical.