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Sequential transmission shifter11/13/2023 ![]() Straight-cut gears make a high-pitched whine, but they also transfer power from the engine to the wheels more efficiently. Helical-cut gears have angled teeth, allowing them to mesh more smoothly. the DSG transmission (and all transmissions designed for road cars) uses helical-cut gears, while the sequential 'box uses straight-cut gears. FCP Euro reckons it's about 100 pounds lighter than the DSG, too. This transmission also allows for equal-length axles, helping to control torque steer in the front-wheel drive GTI TCR race car. That allows for no-lift shifts, but also requires the use of a rotating barrel instead of shift gates. The sequential gearbox has all of its gears lined up on one input shaft, and they engage the output shaft using dogs. They're positioned on either side of an output shaft, which sends power to the axles (one of which is shorter than the other), and engage the shaft using synchronizers, just like other modern road-car transmissions.ΔΆ018 Volkswagen Golf GTI TCR (Photo by FCP Euro) The TCR-spec DSG has two input shafts, each with three gears. ![]() The internal layouts of the two transmissions are very different. That provided a good opportunity for a gearbox comparison, as the TCR race cars started out with a modified version of VW's Direct Shift Gearbox (DSG) dual-clutch transmission used in the GTI road car, but were later upgraded with Sadev sequential transmissions. In addition to selling parts, FCP Euro has a race team that ran the Volkswagen GTI TCR for two seasons. This video from parts supplier FCP Euro explains the differences between these two types of transmission. Sequential and dual-clutch gearboxes both allow you to manually select gears without a clutch pedal, but that doesn't mean they're the same.
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