The front, rear and front fenders as well as the trim were different. Those had the Chassis Code SA22-C and they were sold in late 78 as a 79 model also sold the next year. Those are referred to as SAs or Series 1 Rx-7. 81 through 83 marked the FB chassis, with revised front a rear bumpers, taillights, fenders, and trim. The interrior was also redone, and a few mechanical things like the option for disc brakes, and a lighter weight bellhousing with a more rearward shifter were added. Buyers could opt for a GSL package that added an LSD and vented front disc brakes with solid rears. This is the Series 2. In 84 and 85 the option for a fuel injected 13B was offered in the model GSL-SE. This model had 4 wheel vented disc brakes, and a 2 cm lower suspension as well as hubs with a 4X114.3 bolt pattern (as apposed to the awkward 4x110) with 4 by 6 inch wheels. These changes gave the Series 3 Rx-7 GSL-Se a skidpad rating of .87g, which is higher than the Turbo II FC. Only changes for the non SE models was an interior update, as well as gill like slits in the front fascia. All of the aforementioned Rx-7s are still considered first generations.
Series 1:
Series 2:
Series 3:
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