I asked about the Phantom Grip on the Friends of Triumph list which has mostly Triumph racers on it.
Here are a couple of the replies.
From everything I've heard they don't do much. looking at the bits I'm not surprised. A salisbury type LSD uses a stack of clutch plates to do the job and they overheat easily. this system seems to use the sides of the spider gears as one clutch surface. There's no real explanation of how it works, just marketing drivel like "hand-selected materials". I spent a lot of time in advertising, I speak BS. That's absolutely BS.
It's a faction of the cost of a real LSD. I expect it works about a fraction as well.
and
Paul,
If you are considering buying into that technology, don't waste your money.
Any grip you get from it is certainly "Phantom".
What it amounts to is a bunch of metal parts that are installed into the
differential and exert pressure on the planetary gears that keep the thing
from favoring one side over the other. It is all based on friction and
after installing one in a Spitfire differential, I can truthfully say that I
could not tell any difference in that and an open diff.
and
Some people say they are better than nothing; some don't. Wear out rapidly,
not suitable for the street, etc.
and
Start with a bucket of dough. What you really want is the salisbury
clutch type diff, currently manufactured by
Tran-x.
http://www.tran-x.com/DiffsHTML/TR6.html These are not
cheap. Another alternative is the Quaiffe limited slip, but that is
a torque sensing gear drive design that requires both rear wheels on
the ground to work
right.
http://www.upgrademotoring.com/performa ... fe_app.htm
Lift the inside wheel and it's not much better than an open
diff. Another less expensive option is a welded diff - you can start
with that and move up to the Tran-x.
Paul
