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"destroyed countless diffs"?
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Posted by gorper (more from gorper) on Tue, 7 Dec 2004 10:47:53 Share Post by Email
In Reply to: Re: Scanwest sells a "modified"? 5 speed, Andrew [Profile/Gallery] , Tue, 7 Dec 2004 08:09:23
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Where are you getting this information, Andrew? Not a single message on improvedtouring.com or sccaforums.com or honda-tech.com's roadrace forum mentions diff failure with PG. Search them for yourself. Countless failures?

Grassroots Motorsports magazine did a good article on diffs recently; they did not mention rampant failure of PG-type diffs but did caution about possibility of metal in oil for some applications. Do you think that a magazine whose primary readership comprises *club racers* would fail to include such a detail? I don't (BTW, never seen a PG ad in GRM, FWIW).

PG didn't invent the contraption, BTW; they just make their own flavor of an existing design. People make their own; it's not rocket science!

I believe Scanwest has installed about a half dozen, maybe more, by now. They machine the spider gears on-site for better friction, and do the install by the instructions: precise measuring for proper clearance & operation, etc.

The Quaife, BTW, is not the be-all-and-end-all -- the torque bias ratios they use are often unsuitable for really hard driving. I recently searched for info and read many posts by dissatisfied club racers who still had extreme cornering wheelspin. These units are not adjustable, BTW, and, if you get a wheel in the air on heavy throttle, 100% of the torque goes to it; when the wheel touches down, the diff or other driveline parts can break.

The reality for c900 owners is that there is no viable option for a diff; the PG is the only thing you can do. The cost for custom diffs is prohibitive (one attempt I heard about for getting them for c900s was by converting a Volvo diff but it would have run you about two grand, and that's with a group buy); the old Sport & Rally units are rare as hen's teeth.


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