It should be noted that also in 1991 Mazda created the limited edition Japanese market only Infini IV (pronounced on'-fin-ee).


Although Mazda had produced earlier versions of the Infini (the Infini I through III models), but the IV was the first to bump up power and the suspension.

Stripped of all Savanna and RX-7 identification, this was the last limited edition ultra high performance version of the 2nd-generation RX-7. A factory hot rod, the Infini IV was lightened (to 2770 lb.), by stripping out the extras such as a sun roof, and using lighter parts including lightweight, perforated suede like material racing style seats, a smaller brake master cylinder, reducing the noise dampening material and using the 1986-1987 Sport/GS model's light weight carpet.

With a revised suspension (shocks 25% stiffer, springs 10% stiffer and lowered 1") Special Pirelli designed P-Zero tires, ultra lightweight 16 inch BBS wheels and a bright red front strut brace, the handling improved to a skidpad of .91 Gs. The Infini IV (as with most 91 models) also came with the tighter steering rack from the 89-90 North American GTUs model and its engine speed sensing power steering. Molded knee Pads at the driver's door side and center console were added to help brace the driver's legs while cornering, while a "dead pedal" bar ran the length of the passengers floor. As common on Japanese domestic cars; an emergency flare and holder were also mounted just under the glove box.

Similar again to the US spec 1989 and 1990 GTUs the Infini IV came with the 4.3 rear end final gear (but also used a new Torsen Limited Slip Differential), and the options kept minimal with air conditioning, Infini embroidered floor mats, and a AM/FM radio the few options available (however it did come standard with a rear window wiper and power windows). Power was bumped to 215 HP (JIS), largely by changing the exhaust to a free flowing design and revised ECU. The Infini IV, also came with the Bronze tinted glass found in the US spec 10th Anniversary edition, and was available in one of two custom black/green metallic paint colors. Of the 600 made, the first 300 cars built on limited production runs between June - Dec 1990 were painted Mazda paint code GU (Shade Green) while the last 300 cars built starting Jan 1991 through February 1991 were paint code VQ. Of these last 300, 20 of them where sent to MazdaSpeed for the MazdaSpeed Package which only did minor cosmetic changes like MazdaSpeed embroidered seats, MazdaSpeed steering wheel and shift ****.


In US testing 0-60 performance was reported at 6.5 seconds and the quarter mile time dropped to 14.9 seconds, with Infini specific brake pads helping make an impressively matching braking force of 60-0 in 141 ft (8 feet less than the standard RX-7 Turbo) despite the ABS being deleted off of the car at time of production.

The Infini IV was not imported to North America other than a single press version that was returned back to Japan after the press tour.