![]() This keeps the engine within its optimum power band more effectively, resulting in better acceleration through the gears. Most cars use a straight-cut first/reverse gear it is the swap to a dog-engagement racing gearset that will affect the drivability of a road car.Ĭloser ratios give a reduced engine RPM drop when changing up a gear. In fact a straight-cut synchromesh gearbox is no different in operation to a regular gearbox, but it will be louder. There is a myth that driving with a straight-cut gearbox on the road is hard work. We estimate between 5-7bhp can be gained at the wheels by using a straight-cut gearset. It also reduces power losses to make the most of the engine's power. Using straight-cut gears allows us to design a stronger transmission within the standard casing. As power outputs increase, this places greater strain on the transmission casing and bearings, in-turn leading to reduced reliability. The design of helical-cut gears, as found in standard gearboxes, leads to increased side (or axial) loadings on the transmission.
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