It is, however, bad for the clutch.Īs the driver lets the clutch out, the trouble comes when the engine tries to match a transmission at a lower rotational speed. So, power shifting isn't necessarily awful for synchronizers. It's the synchronizer's job to match those gear speeds to create a smooth shift. Now, second gear and first gear's rotational speeds do not match (second gear is spinning slower). The driver then pops the transmission into second gear. Now, the transmission speed drops (since the clutch is no longer engaged) and the engine speed climbs since it's now disconnected from the transmission. Second, the driver presses the clutch in. The wheel speed, engine speed, and transmission gears are all operating at the same speed and rotating together. At that moment, everything is working in concert. When power shifting, the driver presses the accelerator all the way down for maximum acceleration. While it may create a slight extra surge of power in the moment, there are really zero actual benefits for not engaging the clutch pedal when shifting. That is, match the wheel speed to the transmission speed. Without using the clutch, the driver is asking the synchronizer to do a job it's not supposed to do. No-lift shifting is really bad for a pretty straightforward reason. We'll separate the topics into two categories: no-lift shifting and "power shifting." Jason Fenske of Engineering Explained tells us all about the issues the process causes in a new episode. Long story short, it's a really bad idea. You may have heard the term before: "no-lift shifting." It's the process of foregoing the clutch altogether and simply popping the car into the next gear.
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