More progress to report, and a question...
I spent last weekend cleaning up the suspension subframes. They're caked with mud and the front edges of the lower control arms are pitted from gravel.
These are the custom rally shocks I built 10 years ago. I started with standard Miata Bilsteins and replaced the fixed lower mounts with threaded coil-over seats. I had Schraeder valves welded on the bottom of the housings so I could de-pressurize and recharge them myself, then I cooked up a rally valving for the inside with help from a Bilstein buddy. The gas fittings also give my the option of adding remote reservoirs later. I had to fabricate centering rings for Eibach ERS race springs and weld them to standard Miata top mounts.
I made my own spring selection from the Eibach catalog based on a few rough calculations. The fronts worked perfectly, but I missed the setup a little bit in the rear -- I need to bump the rear spring rate up by 5% or so to keep the ass end from squatting too much after landings.
None of that matters unless or until I decide to retry the Rally Miata concept, of course. For now these are destined for the garage shelf. I just picked up a set of stock '90 spring/shock units tonight. All that's needed now is a good cleaning and I can get to work re-installing the sub-frames.
The finless diff on the left is the original unit from this car (I found a 4.3 pumpkin I forgot I had in my own garage). The finned housing on the right came out of a '91 production car. Anyone else have a naked Miata diff housing like this?
Found and installed a piece of package shelf carpet. Still looking for floor carpet. The local source that thought he had a piece turned up dry.
Still need vintage 14" race tires. I figure this will be back on the ground in two weeks or less.