Well AFAIK:

The 1990 GEO Prism is nothing more than a 4DR Corolla with the 1990-91 GTS 4AG motor and Tranny but better brakes and heavier. As with every other 4AG powered car is where it belongs... ITB

The Storm on the other hand is nothing more than a 90-93 FWD Isuzu Impulse "Handling by Lotus". Nice handling car. Chech ISUZONE

1990-1992 Isuzu Impulse: Highlights

Introduced in late spring of 1990, the new front-drive Impulse replaced Isuzu's previous rear-drive model of the same name. The sporty 2+2 hatchback shared its front-drive chassis, and one of its engines, with the subcompact Isuzu Stylus sedan. At this time, Isuzu was partly owned by General Motors. A similar sport coupe, called the Geo Storm, went to Chevrolet dealers. A driver's airbag was standard on both the base XS and the high-performance RS coupe. Standard equipment in the XS includes a sport suspension tuned by Lotus (the British sports-car maker, also owned by GM), 4-wheel disc brakes, power steering, and 185/60HR14. The 1.6-liter, dual-overhead-cam XS four-cylinder engine produced 125 horsepower and came with either a 5-speed manual or 4 speed automatic transmission. A 160-horsepower turbocharged engine went into the RS coupe, which had permanently engaged 4-wheel drive instead of front drive. The RS came only with 5-speed manual shift.

Year-to-Year Changes
1991 Isuzu Impulse: An extended-roof hatchback coupe, with Kammback-like rear styling, joined the original model this year. Antilock braking was optional on the RS edition.

1992 Isuzu Impulse: A more-powerful engine went into this year's Impulse coupes and hatchbacks. The XS edition got a dual-cam, 1.8-liter 4-cylinder that produced 140 horsepower. It replaced the former 130-horsepower, 1.6-liter powerplant. As before, the RS featured a turbocharged version of the 1.6-liter, rated at 160 horsepower. Otherwise, little changed in what would be the model's final season. The similar Geo Storm continued into the 1993 model year.



Thanks,

Efrain