OT: Mazda RX7 FC3S

[Mux213]

RX7 SA = First generation RX7 with 12A carb motor, made from 1978 to 1985
RX7 FB = First generation RX7 with 13B carb motor, made in 1984 and 1985
RX7 FC = Second generation RX7 with 13B EFI motor (N/A or single turbo), made from 1986 to 1992
RX7 FD = Third generation RX7 with 13B EFI twin turbo motor, made from 1992 to 200?

The FC turbo was named TII because it was the second RX7 with a turbo eventhough its a single turbo setup, there was a factory first gen turbo but never got beyond prototype, there was also a 12A turbo in one of the other RXs factory produced.
The FD does have a true twin turbo setup.

The SA model actually has about 3 revisions (S1 to S3) but only the FB model was so different due to the 13B motor that it got its own designation. Only the later SA models and the FB model had disk brakes all round and are most desirable.

With the FC there are also two revisions, the S4 and S5. The S4 is recognisable by the square lights in the back. Interesting about this model is that the turbo is a "scroll turbo" design. This means that they actually have a dual turbo fan design with a valve making the single turbo acts as a dual turbo with a smaller fan blade running on low RPM and a bigger fan blad running at higher RPM. The system was only mildly effective and on the later model S5 they used normal single stage turbo's.
The S5 is recognisable by the round lights and both the N/A and Turbo'ed engine is slightly more powerful then its S4 brother.

I don't know how many revisions the FD has but they start at the S6 designation.

Confusing eh?