Introduction to Maserati
ZF automatic 6-speed gearbox
Introduction A completely new automatic six speed gearbox (ZF 6HP26) was introduced for the Maserati Quattroporte with automatic transmission, presented in January 2007. Also the Maserati GranTurismo uses the same gearbox for the automatic transmission version. The Gearbox is built by ZF and has been developed in cooperation with Maserati and Bosch (electronic control) to offer the best possible compromise between driving dynamics, fuel economy and comfort. The gearbox contains 6 electro-hydraulically controlled gears and a torque converter with lock-up clutch and anti-slip function. The automatic gearbox has a self-adaptive control system that adjusts the type of gearshift strategy, selecting the gear most suited to the driving conditions and driving style. The driver can choose from four different driving modes: Auto Normal, Auto Sport (selectable by pressing the SPORT button), Low-grip /Auto ICE (selectable by pressing the ICE button) and Manual (selectable by shifting the gearshift lever from "D" to the left). For the Auto Normal and Auto Sport driving modes there are two different types of gearshifting, automatically selected by the gearbox/engine control system based on the driving style (detected through the accelerator pedal and the intensity of lateral and longitudinal acceleration) and the gradient of the road. Electronic control: The electronic control of the gearbox is the “MECHATRONIC” type, meaning that both the hydraulic and the electronic control unit are integrated in a single unit inside the gearbox. This ECU provides dynamic gear ratio selection and has a sequential gear selection program. The adaptive shift strategy memory can be reset by performing the Cycle function with SD3 diagnostic tester. By doing this the gearshift strategy will return to its default settings.
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