build diary

May 6, 2004: Lots of differential design going on!
This is fun stuff. Lester Seal reports that he built an E Production Miata that didn't have a PPF. His solution was to run a short piece of tube forward from the top of the diff and anchor that. It was triangulated with a tube coming up from the bottom of the diff. This reportedly worked quite well, and an upside-down version could certainly be adapted to the Seven. It's also something that could be retrofitted so I'm going to try simply putting in a hard mount in place of the rubber bushings I have at the moment. Combined with a proper locking nut that should prevent any movement. It's also very light (I have some aluminum spacers to replace the rubber) and easy. I figure I'd rather put the existing mount into compression than try to hook something up to the bottom of the frame and have it in tension.

This is interesting. They're basically intended to bypass the bushings in the diff mounting arms to give a more solid mount. A shiny version of my Shoe Goo and the plastic inserts I'm using now. I can't see how it benefits a Miata but I was actually considering exactly the same thing for the Seven yesterday before these were brought to my attention!

I've also been looking at the driveshaft angle. I've got the nose of the diff too high at the moment - it really should be parallel with the output shaft. It's a good thing I was looking at the diff and caught that.

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