To bring engine revs down, cylinders are deactivated. This trick ensures ultra-quick response times fully comparable to those of a naturally aspirated engine. "The S55 uses BMW's Valvetronic variable valve timing and Double-VANOS variable camshaft timing system… In "Sport" and "Sport Plus" settings, the turbochargers are "pre-tensioned," which means that they keep spinning at a high rate of speed even after you have taken your foot off the throttle. The valvetronic does this in Sport+ already "The throttlebody doesn't shut, so boost stays on" Lastly, don't take it from me, here's an "Engineering Explained" video on modern tech w/ manual transmission cars - using the brand new Cadillac as a demo vehicle: The software does this by recognizing the clutch has been released, and instantly advances timing to the norm / releases low redline and you're flying. You shift into the next gear, drop the clutch and you're at full torque and power in gear The software adjust timing and/or redline so you're not over-revving your engine while not in gear. The throttlebody doesn't shut, so boost stays on You get to keep your foot on the throttle The benefit of Powahshifting / flat foot shifting is: Then, when you're in the next gear, you experience an acceleration bog because your engine has to re-pressurize the charge system (build boost) before all your ponies wake up and kick. Right now, if you're shifting traditionally (being kind to your clutch & gearbox) - you disengage the throttle, which shuts the throttle body, which results in the bypass / blowoff valve discharging boost so you don't choke the turbo. I reached out to the ProTuningFreaks team about software features to enable (Power Shifting) / (Flat Foot Shifting) with 6MT S55 cars.
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