924 to 944 turbo

The 944 was introduced in 1982 with a 2.5 L straight-4 engine whose design was based on one half of the Porsche 928's V8 engine. While the design was very similar to the V8, very few parts were interchangeable. The 944 was based on the the earlier 924 model, but featured numerous changes including updated bodywork with flared fenders and a rear spoiler similar to that on the previous 924 Turbo. The interior was mostly the same as the 924, except for new climate control switches. Porsche also licensed Mitsubishi Motors' vibration-reducing balance shaft technology for use in the 944's engine, at a cost of $8 per engine produced.^{[citation needed]}

In 1985 Porsche introduced the 944 Turbo, a higher-performance variant, known internally as the 951 (952 for right-hand drive models). This had a turbocharged and intercooled version of the standard car's engine that produced 220 hp (217 in the US) at 6000 rpm. The Turbo also featured several other revisions, such as improved aerodynamics, a strengthened gearbox, wider wheels, and uprated suspension. Major engine component revisions, more than thirty in all, were made to the 951 to compensate for increased internal loads and heat.