I think you're fortunate that the Capri shares it's mechanics with the Mazda 323. So it'll probably be worth investigating these engines :
* 1989-1991 - 1.8 L (1840 cc) BP, FI, 16-valve DOHC, 125 hp (96 kW)/118 ft·lbf (160 N·m)
* 1989-1991 - 1.8 L (1840 cc) BPT, FI, 16-valve DOHC, turbo, 163 hp (120 kW)/159 ft·lbf (216 N·m)
* 1992-1993 - 1.8 L (1840 cc) BPD, FI, 16-valve DOHC, turbo, 210 hp (156 kW)/173 ft·lbf (235 N·m). Powered the Familia GT-R
* 1990-1993 - 1.3 L (1324 cc) B3, 1 barrel, 75 hp (55 kW)/76 ft·lbf (104 N·m)
* 1990-1993 - 1.7 L (1720 cc) PN, Diesel, 8-valve, 57 hp (42 kW)/79 ft·lbf (107 N·m)