Powershifting, no-lift shifting, or flat foot shifting is a method of changing gears in a manual transmission where you do not take your foot off the gas pedal.
source/image(PrtSc): Engineering Explained
Unfortunately, this shifting method is very tough on clutches, so there’s a right way and a wrong way of doing it.Watch the video from Engineering Explained for more info:
Cadillac, with the CT4-V Blackwing, has developed a methodology to powershifting that maintains boost pressure of the twin-turbo V6 engine, while reducing the engine load during the shift.
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This clever trick involves altering ignition timing, wastegate control, and the bypass valve control. In the end, the desired result is great – a seamless manual transmission shift, all without lifting your foot off the throttle.//Engineering Explained