phantom grip diffs

[scirocco-al at insight.rr.com (Scirocco-al)]

I had an OPM.  Pretty much junk in my opinion.  I wore 0.060 of each clutch
face/spring block by running 6 auto-x's and about 400 miles street use.
Save your money and buy the quaife or peliquin.  In fact the 80% shim kit
worked better in my car than the OPM piece.  If you have to buy the phantom
grip or the OPM then at least get the OPM.  They add an extra brass wear
piece between the spider gear and the cast pumpkin where phantom grip
supposedly doesn't.

I had my blocks remade from A2 tool steel instead of the (looked like) 1018
steel that came from OPM.  I did not harden them.  I did have another set
made and hardened previously (Rockwell 38-40) but they shattered when I
tried to install them.  I'm sure the A2 blocks were the answer and it cured
the wear problem I had with their material, but I never got around to
installing it back in my car.

Alan
----- Original Message ----- 
From: "Ron Pieper" <rapieper@yahoo.com>
To: "Ryan H" <rhock99@epix.net>; "brett cooke" <vwscir88@hotmail.com>
Cc: <scirocco-l@scirocco.org>
Sent: Saturday, May 17, 2003 7:58 AM
Subject: Re: phantom grip diffs


> --- Ryan H <rhock99@epix.net> wrote:
> >...almost as good as a real LSD.
>
> If I'm not mistaken, Phantom Grip (www.phantomgrip.com)and OPM Motorsports
> (www.opmmotorsports.com)limited-slip diff both offer the *exact same*
technology - springs and
> friction surfaces - that have provided LSD capability to untold millions
of American and other RWD
> cars.  They *are* 'real' LSD's - they defined the term before the TorSen
(precursor to Quaife, who
> basically copied and modded the design IIRC) was invented.
>
> A friction LSD is simple and it works.  They do wear over time...a long
time.  I envision faster
> wear for sure on an autox than a drag strip, since you're spinning the
diff more when turning.
> I'd reckon that OEM units are better designed than Phantom Grip and OPM,
but that's just an
> opinion.
>
> The reason I don't like them for VW's is that our diffs *were never
designed for them* and have to
> be modified to accept them.  Those springs work against spider gears that
simply weren't meant to
> have spring tension against them, or serve as friction surfaces.  On VW's
part, this is NOT a
> design flaw, NOT a design omission - it simply wasn't degign *criteria.*
>
> A Quaife is heavier and will not stop an unloaded wheel from spinning.
(But really, how often is
> one front wheel in the air, anyway?).
>
> I'd not hesitate to try an OPM version except that, at $675, a Quaife or
Peloquin diff (not the
> shim kit) is not that much more expensive, and isn't a compromise
solution - it's a purpose-built,
> fully engineered, tested, and warranted product.  And the Quaife is
superbly machined, if I might
> add.
>
> $0.03, this time.  I need more money, I'm out of work.
>
> Ron
>
>
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