Race cars sometimes even have triple clutches. Semi-automatics change gear incredibly fast on account of the special clutch design (and dual clutch transmissions are faster still). Either way, shift command transmission is exclusively electrical. Race cars usually have a rocker switch on the steering wheel, whereas normal cars have a gear lever. But the types used in Formula 1 and the like are the deluxe version, because the priorities are very different to those for road driving. The reason it’s so loud is because of the straight cut (spur) gears. No doubt you’re familiar with the unmistakeable earsplitting sound a sequential transmission makes – like a wheezing crackle. ![]() The technology behind sequential transmissions originates in motorsport. Sequential transmissions in motorsport engineering So a sequential transmission gives you the best of both worlds. When it comes to gears, a fully automatic shifting system is obviously far more convenient because there’s no clutch. One big advantage of a semi-automatic is that there’s no torque converter, which means your fuel consumption is lower. But you do get more of a feel for the car and for driving. Since you can’t skip a gear, your freedom is somewhat limited. For example, at the red light they go straight from fifth to first, which contradicts the usual definition of a sequential transmission. in today’s sports cars, that’s not entirely accurate. That’s why the sequential shifting system is often referred to as semi-automatic. However, the process is largely automated: all you have to do is touch the lever. So you can only ever go up or down one gear. Unlike manual shifting, you change gear in a linear sequence. But the term is also used to mean a transmission that’s a cross between manual and automatic. Fundamentally, it only refers to the actual process of shifting: you have to shift each gear up or down in sequence – you can’t jump from second to fourth for example. ![]() First of all, the term ‘sequential gearbox’ tends to be used inconsistently.
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