You're mistaken Dan. First, the base weights for the 12A, 13B, and Renesis are 2225, 2615, and 3000 respectively. Second, those are base weights for the engine installed, ignoring the chassis it's installed into. Same goes for the piston engine table/weights: piston engined cars get a weight based on displacement. Once you've chosen your base engine - and thus, the base weight - chassis-specific weight requirements/allowances apply over and above that base weight, such as -2.5% for strut-type FWD and +2.5% for RWD.
For example, if you choose to use a 1.8L piston engine, your base weight is 2430. If you install that into a RWD chassis (e.g., Mazda Miata) you add 2.5% for a total of 2491; if you install that engine into a strut-type FWD chassis (e.g. Mazda GLC) you subtract 2.5% for a total of 2369.
Same goes for the rotard engine: start with a 13B and and your base weight is 2615 pounds. Install that engine into a RWD chassis (e.g., 1st gen RX-7) you add 2.5% for a total of 2680; if you install it into a strut-type FWD chassis (e.g. Mazda GLC) you subtract 2.5% for a total of 2550.
GA
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