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This is the RX7 Turbo rear end subassembly. I got it for $400. Stronger than the Miata diff I was going to use, these handle 500ft/lbs with no problem. It includes LSD, 11" disk brakes, and is fully independent. I didn't want to cut it, to preserve it's strength, but it's 8" wider than the Spitfire front end. Therefore, the front end needs to be widened 8.5", for good handling characteristics. |
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The Spitfire chassis is an hourglass shape, and is only 10" wide where the rear subassembly would connect: not good. Considering that the rear needs rebuilding, and the front needs widening, we decided to construct an entirely new, light weight chassis. At right are the basic plans. |
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Frame fabrication starts with matching the mounting points on the rear subassembly. 2" by 2" by .096" square tube steel is used. |
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Laying out the basic structure on the chassis jig. |
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More fabrication was done after the tub was set on the frame. The safety cage is welded in, and provides torsional rigidity for the chassis. |
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The chassis and supports under the 'bonnet'. |
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