Re: [Spridgets] Diffs again, if I may

[Daniel1312@aol.com]

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@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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