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General Motors' (GM) eAssist powertrain builds upon the knowledge and experience gained from GM's first generation 36Volt Belt-Alternator-Starter (BAS) system introduced on the Saturn VUE Green Line in 2006. Extensive architectural trade studies were conducted to define the eAssist system. The resulting architecture delivers approximately three times the peak electric boost and regenerative braking capability of 36V BAS. Key elements include a water-cooled induction motor/generator (MG), an accessory drive with a coupled dual tensioner system, air cooled power electronics integrated with a 115V lithium-ion battery pack, a direct-injection 2.4 liter 4-cylinder gasoline engine, and a modified 6-speed automatic transmission. The torque-based control system of the eAssist powertrain was designed to be fully integrated with GM's corporate common electrical and controls architectures, enabling the potential for broad application across GM's global product portfolio.

General Motors adds a larger displacement more powerful variant to its global 4-cylinder engine family. The new Ecotec 2.4L VVT, being introduced in the 2006 Pontiac Solstice is the latest variant within the Ecotec engine family. This new engine is built on the heritage and excellent reputation of the Ecotec 2.2L(1), the global 4-cylinder engine introduced for the North American market in the 2000 model year Saturn L-series. Ecotec engines are now offered in many additional GM platforms in North America as well as in Europe. The Ecotec 2.4L VVT shares many parts with the Ecotec 2.2L(1), with addition of cam phaser technology to enable variable valve timing (VVT) along with several structural enhancements. The Ecotec 2.4L VVT produces 25% more power, impressive torque at lower engine speeds and offers a number of other advantages.