before shutdown helps prevent turbo seal and component failure and as such greatly extends the turbo's lifespan. For the 1981 model year Porsche released a revised 924 Turbo Series 2 (although badging still read "924 turbo"). By using a revised turbocharger with a larger compressor and a smaller turbine running at increased boost, slightly higher compression of 8:1 and an improved fuel injection system with DITC (Digital Ignition Timing Control) ignition triggered by the flywheel, peak power rose to . In North America, the 924 Turbo arrived in late 1979 for the 1980 model year. It was saddled with extra weight compared to Euro-spec cars, due to the federally mandated large bumpers and other safety equipment, and less power due to stringent emissions controls. Power was , nearly twenty percent down on the European model. For the 1981 model year, power increased slightly to and the transmission was switched to one with a regular H-pattern layout (North America only). The 924 Turbo also saw success in Motorsport, mainly in rally guise, preceding the introduction of the 924 Carrera GT. Between 1977 and 1980 Jürgen Barth and Roland Kussmaul headed a project to develop a competition specification 924 Turbo. The competition cars were based on prototype 931s purchased from the factory by the Porsche head of motorsport Peter Falk, modifications included but were not limited to a wider track, Rallye arches and auxiliary light pods. The car first competed in the 1979 Monte Carlo Rally and with Barth and his co-driver Kussmaul at the helm, the car finished 4th in the GT4 class, despite being de-specced due to homologation requirements. The 1979 season continued with the same car and drivers taking part in the famous 19,000 km 1979 Round Australia Trial. Impressively the car won its class, completing the trial with accumulated penalties of 13 hours and 9 minutes across the 134 stages. The 1981 season saw the 924 Turbo make history when it carried a JVC camera inside the cabin, capturing the first ever in car footage of the famous Monte Carlo Rally. This was its final season, retiring to make way for the intercooled 924 Carrera GT. Carrera GT In 1979, Porsche unveiled a concept version of the 924 at the Frankfurt Auto show wearing Carrera badges. One year later, in 1980, Porsche released the 924 Carrera GT, making clear their intention to enter the 924 in competition. By