I've filed this info. from the IZCC group. Thought I'd pass it along:
'90: NA begins production in Spring '89 -- TT begins in the Fall.
Extended model year sales: 39,290
'91: Manual climate controls discontinued (except in convertible).
New electronic climate controls allowing control over air flow direction,
but no more ambient temp gauge.
Nissan hamburger logo put on nose of car.
Driver's airbag now optional.
Air Conditioner evaporator valve changed from aluminum to steel to
quiet it.
NA rotors changed to TT units. Previous NA rotors were 2 mm thinner.
CD Player option added for both TT and NA. Previously only available
in NA.
Bose stereo head unit changed.
Logo on floor mats changed from "300ZX" to "Z".
Hardtop coupe available at mid-year (NA only).
Brake master cylinder changed to new unit in Feb. 1991.
Keyhole on driver's door and interior light illuminated when driver's
door handle is pulled.
Sales: 17,652
'92: Driver's airbag made standard.
Brake caliper material changed from aluminum to iron, to help warpage/shimmy
problems.
Dash/door complimentary material changed from fabric to suede.
Separate mirror heater switch eliminated (combined with rear defroster
switch)
Mirror heaters made standard.
Power adjustable driver's seat standard on T-top.
Sales: 6,708
'93: Turbo oil line insulation changed for better heat dissipation.
Convertible option added.
Upgraded Bose stereo made standard.
AIV/reed valves removed.
Sales: 11,599
'94: Rear spoiler design changed to a higher/bigger pedestal one.
Super HICAS system changed to an electrically actuated unit (previously
oil pressure act).
Seat belts redesigned. Moved from door mounts to true pillar mounts.
Passenger airbag made standard.
Keyless entry added.
Titanium keys discontinued in Nov. 1994.
Off-white 'Pearl' color is dropped. Future 'pearls' are more of a semi
metallic white.
Sales: 5,320
'95: Front fascia becomes body colored instead of gray strip.
Special 25th Anniversary gold paint available.
'Reset' button removed from dash clock (may have happened in '94).
Sales: 3,135
'96: Variable cam timing 'quietly' dropped due to smog regulations,
reducing
5 speed engine output to 280 HP. Different cams installed to compensate
for lost HP (total still at only 280 HP).
OBD II electronics introduced.
Driver's seat back rest no longer includes adjustable side bolsters.
MOTRSPRT
Note: if you find anything else, or something is inaccurate, mail
me about it please!
