ok im in love with rotary engines and the geniousness it took to make them
and of course like most rotary fans i love the fd's but now im starting to like the fc's and i wanted to know the differences in the GXL, GTU, etc... and s4, s5, etc...

please help me out, im learning.

 

all the info u ask is in the stickey at the top of the page. "faq for the FC"

 

And you've been here for how long?
S4 = Series 4 = 86-88
S5 = Series 5 = 89-91 Some minor changes
Trims models from low to highest
Base<GXL (luxury version)<GTU (track version)< TII (beefier track version)

 

reading is the best way to learn.

 

Check the FAQ for all the details you're looking for:

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/faq-fc-frequently-asked-questions-2nd-generation-rx-7-a-181219/

GXL - luxury package
GTU - power everything, no leather
SE - base
Convertible - has GXL package for 89-91, non-leather in 88
Turbo II - comes with GTU interior, leather optional

S5 - engine generation of 89-91 engine (more HP) & minor body revisions (S5 engines went in other rotary cars too).
S4 - engine generation of 86-88 (less HP).

 

I think you're looking for this:

What did my FC come with standard/options? -> https://www.rx7club.com/2nd-generation-specific-1986-1992-17/specifications-what-did-2nd-generation-rx-7-come-w-options-standard-features-249616/

Has a break down of all options and features that came with what model for what year.