[Spridgets] Diffs again, if I may
Daniel1312 at aol.com
Daniel1312 at aol.com
Wed Jun 27 12:40:01 MDT 2007
What Bill says is borne out by my own experience. The Phantom Grip device
works like a Torsen diff NOT a clutch plate diff.
What this means is that when one wheel trys to rotate faster than the other
the Phantom Grip resists it and trys to keep both wheels turning at the same
speed. The effect in any situation is that the rear of the car will seek to
step out towards the right (don't know why it's always to the right). In this
respect the Phantom Grip action is just like the Quaife Automatic Torque Biasing
diff which they are not allowed to call a Torsen because if they do Gleason
will sue them.
I personally consider it's unhelpful to think of the Phantom Grip as having
clutch devices as this can lead to confusion with the action of a clutch plate
limited slip diff which is quite a different thing altogether.
A clutch plate limited slip diff like a ZF seeks to switch power from the
wheel that has less grip to the wheel that has more which invariably overloads
that wheel and thus reverses the power back again and so as this cycle repeats
the rear of the car fishtails as the wheels fight for grip.
In a message dated 27/06/07 18:06:05 GMT Daylight Time, John.Deikis at va.gov
writes:
> I have a Phantom Grip on my vintage race car. Bill Perry told me it was
> essentially a "torque sensing device" and would limit inside wheel slip
> until the inside wheel lost all traction. He said at that point there
> was "zero torque" so the Phantom Grip did nothing.
>
> I'm trying to understand this.
>
> Can someone explain in simple terms how the Phantom Grip spring-operated
> clutches work in different low traction situations?
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