![]() These ‘dogs’ interlock with each other to provide a stronger, more positive gearshift than is physically possible using a synchromesh arrangement, which can easily be ‘beaten’ during a fast shift and is ultimately likely to fail if continually abused. Developed by leveraging our expertise with motorcycle drivetrains, these gearkits completely dispense with the original synchromesh engagement mechanism, instead using a motorcycle-style ‘dog-tooth’ arrangement where each gear meshes to the next by a series of hard wearing precision machined teeth ‘or ‘dogs.’ Quaife dog engagement gearkits are designed for drivers seeking a high strength geartrain that offers rapid gear selection. For product selection advice from our synchromesh gearkit range please contact our Technical Sales Team. For many applications a choice of Quaife final drive ratios is available. The vast majority of Quaife helical and straight-cut close ratio motorsport gearkits can be installed into a standard production gearbox casing with few, if any, modifications required. Where possible, certain Quaife synchromesh gearkit applications convert a standard five-speed gearbox into a six-speed close ratio unit to fully maximise the potential of the car’s powertrain package. On highly tuned, high revving engines, this greatly improves vehicle performance. Quaife helical and straight-cut synchromesh gearkits feature close ratio gears, enabling drivers to easily keep the engine operating in its power band, with minimal rev drops between gearshifts. Standard production car gear ratios are frequently designed as a compromise between fuel economy, noise and motorway cruising and are often unsuited to circuit, rally or trackday use. This has the potential to increase gearbox durability and reduces parasitic transmission power losses to a minimum, meaning more engine power is delivered to the car’s driven wheels. Quaife ‘straight-cut’ (or ‘spur’) synchromesh motorsport gearkits feature ratios where each tooth is machined at angle straight across the gear, enabling torque loads to be transmitted at right angles to the main gearbox bearings. This can improve reliability by reducing bearing stress, cuts parasitic transmission losses to increase performance and, courtesy of Quaife’s wide tooth form design, greatly improves strength. Compared to standard production gear profiles, Quaife’s helical synchromesh motorsport gearkits reduce the angle (helix) that the gear teeth are machined at relative to the gear shafts. Quaife’s close ratio, synchromesh, motorsport gearkits are the entry-level transmission upgrade for production based cars, and are available in either helical or straight-cut tooth forms.
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